# stress-ng **Repository Path**: jscloud/stress-ng ## Basic Information - **Project Name**: stress-ng - **Description**: No description available - **Primary Language**: Unknown - **License**: GPL-2.0 - **Default Branch**: master - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 0 - **Created**: 2025-06-26 - **Last Updated**: 2025-06-26 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README # stress-ng (stress next generation) Packaging status stress-ng will stress test a computer system in various selectable ways. It was designed to exercise various physical subsystems of a computer as well as the various operating system kernel interfaces. Stress-ng features: * 360+ stress tests * 100+ CPU specific stress tests that exercise floating point, integer, bit manipulation and control flow * 60+ virtual memory stress tests * 80+ file system stress tests * 50+ memory/CPU cache stress tests * portable: builds on Linux (Debian, Devuan, RHEL, Fedora, Centos, Slackware OpenSUSE, Ubuntu, etc..), Solaris, FreeBSD, NetBSD, OpenBSD, DragonFlyBSD, Minix, Android, MacOS X, Serenity OS, GNU/Hurd, Haiku, Windows Subsystem for Linux, Cygwin and SunOs/Dilos/Solaris. with gcc, musl-gcc, clang, icc, icx, tcc and pcc. * tested on alpha, armel, armhf, arm64, hppa, i386, loong64, m68k, mips32, mips64, power32, ppc64el, risc-v, sh4, s390x, sparc64, x86-64 stress-ng was originally intended to make a machine work hard and trip hardware issues such as thermal overruns as well as operating system bugs that only occur when a system is being thrashed hard. Use stress-ng with caution as some of the tests can make a system run hot on poorly designed hardware and also can cause excessive system thrashing which may be difficult to stop. stress-ng can also measure test throughput rates; this can be useful to observe performance changes across different operating system releases or types of hardware. However, it has never been intended to be used as a precise benchmark test suite, so do NOT use it in this manner. Running stress-ng with root privileges will adjust out of memory settings on Linux systems to make the stressors unkillable in low memory situations, so use this judiciously. With the appropriate privilege, stress-ng can allow the ionice class and ionice levels to be adjusted, again, this should be used with care. ## Running latest stress-ng snapshot in a container ```bash docker run --rm ghcr.io/colinianking/stress-ng --help ``` or ```bash docker run --rm colinianking/stress-ng --help ``` ## Debian packages for Ubuntu Recent versions of stress-ng are available in the Ubuntu stress-ng ppa for various Ubuntu releases: https://launchpad.net/~colin-king/+archive/ubuntu/stress-ng ``` sudo add-apt-repository ppa:colin-king/stress-ng sudo apt update sudo apt install stress-ng ``` ## Building stress-ng To build, the following libraries will ensure a fully functional stress-ng build: (note libattr is not required for more recent disto releases). Debian, Ubuntu: * gcc g++ libacl1-dev libaio-dev libapparmor-dev libatomic1 libattr1-dev libbsd-dev libcap-dev libeigen3-dev libgbm-dev libcrypt-dev libglvnd-dev libipsec-mb-dev libjpeg-dev libjudy-dev libkeyutils-dev libkmod-dev libmd-dev libmpfr-dev libsctp-dev libxxhash-dev zlib1g-dev RHEL, Fedora, Centos: * gcc g++ eigen3-devel Judy-devel keyutils-libs-devel kmod-devel libacl-devel libaio-devel libatomic libattr-devel libbsd-devel libcap-devel libgbm-devel libcrypt-devel libglvnd-core-devel libglvnd-devel libjpeg-devel libmd-devel mpfr-devel libX11-devel libXau-devel libxcb-devel lksctp-tools-devel xorg-x11-proto-devel xxhash-devel zlib-devel RHEL, Fedora, Centos (static builds): * gcc g++ eigen3-devel glibc-static Judy-devel keyutils-libs-devel libacl-devel libaio-devel libatomic-static libattr-devel libbsd-devel libcap-devel libgbm-devel libcrypt-devel libglvnd-core-devel libglvnd-devel libjpeg-devel libmd-devel libX11-devel libXau-devel libxcb-devel lksctp-tools-devel mpfr-devel xorg-x11-proto-devel xxhash-devel zlib-devel SUSE: * gcc gcc-c++ eigen3-devel keyutils-devel libaio-devel libapparmor-devel libatomic1 libattr-devel libbsd-devel libcap-devel libgbm-devel libglvnd-devel libjpeg-turbo libkmod-devel libmd-devel libseccomp-devel lksctp-tools-devel mpfr-devel xxhash-devel zlib-devel ClearLinux: * devpkg-acl devpkg-eigen devpkg-Judy devpkg-kmod devpkg-attr devpkg-libbsd devpkg-libjpeg-turbo devpkg-libsctp devpkg-mesa Alpine Linux: * build-base eigen-dev jpeg-dev judy-dev keyutils-dev kmod-dev libacl-dev libaio-dev libatomic libattr libbsd-dev libcap-dev libmd-dev libseccomp-dev lksctp-tools-dev mesa-dev mpfr-dev xxhash-dev zlib-dev NOTE: the build will try to detect build dependencies and will build an image with functionality disabled if the support libraries are not installed. At build-time stress-ng will detect kernel features that are available on the target build system and enable stress tests appropriately. Stress-ng has been build-tested on Ubuntu, Debian, Debian GNU/Hurd, Slackware, RHEL, SLES, Centos, kFreeBSD, OpenBSD, NetBSD, FreeBSD, Debian kFreeBSD, DragonFly BSD, OS X, Minix, Solaris 11.3, OpenIndiana and Hiaku. Ports to other POSIX/UNIX like operating systems should be relatively easy. NOTE: ALWAYS run ```make clean``` after fetching changes from the git repository to force the build to regenerate the build configuration file. Parallel builds using make -j are supported. To build on BSD systems, one requires gcc and GNU make: ``` CC=gcc gmake clean CC=gcc gmake ``` To build on OS X systems, just use: ``` make clean make -j ``` To build on MINIX, gmake and clang are required: ``` CC=clang gmake clean CC=clang gmake ``` To build on SunOS, one requires GCC and GNU make, build using: ``` CC=gcc gmake clean CC=gcc gmake ``` To build on Dilos, one requires GCC and GNU make, build using: ``` CC=gcc gmake clean CC=gcc gmake ``` To build on Haiku R1/beta5: ``` # GCC make clean make # Clang CC=clang make clean CC=clang make ``` To build a static image (example, for Android), use: ``` # path to Android NDK # get NDK from https://developer.android.com/ndk/downloads export NDK=$HOME/android-ndk-r27c export PATH=$PATH:$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin export TARGET=aarch64-linux-android # Define Android API level export API=27 export CC=$TARGET$API-clang make clean STATIC=1 make ``` To build with the Tiny C compiler: ``` make clean CC=tcc make ``` To build with the PCC portable C compiler use: ``` make clean CC=pcc make ``` To build with the musl C library: ``` make clean CC=musl-gcc ``` To build with the Intel C compiler icc use: ``` make clean CC=icc make ``` To build with the Intel C compiler icx use: ``` make clean CC=icx make ``` To perform a cross-compilation using gcc, use a static build, specify the toolchain (both CC and CXX). For example, a mips64 cross build: ``` make clean STATIC=1 CC=mips64-linux-gnuabi64-gcc CXX=mips64-linux-gnuabi64-g++ make -j $(nproc) ``` To perform a cross-compile for qnx, for example, a aarch64 qnx cross build: ``` make clean CC=aarch64-unknown-nto-qnx7.1.0-gcc CXX=aarch64-unknown-nto-qnx7.1.0-g++ STATIC=1 make ``` Build option: DEBUG, build with debug (-g) enabled: ``` make clean DEBUG=1 make ``` Build option: LTO, Link Time Optimization (~1-2% performance improvement on compute stressors): ``` make clean LTO=1 make ``` Build option: PEDANTIC, enable pedantic build flags: ``` make clean PEDANTIC=1 make ``` Build option: GARBAGE_COLLECT, warn of unused code: ``` make clean GARBAGE_COLLECT=1 make ``` Build option: UNEXPECTED=1, warn of unexpected #ifdef'd out code: ``` make clean UNEXPECTED=1 make ``` Build option: SOURCE_DATE_EPOCH=seconds since epoch, add build date ``` make clean SOURCE_DATE_EPOCH=1750685870 make ``` Build option: EXTRA_BUILDINFO=1, add CFLAGS, CXXFLAGS and LDFLAGS to --buildinfo option NOTE: This can lead to build information being leaked and is not recommended for any distro releases. ``` make clean EXTRA_BUILDINFO=1 make -j 10 ``` ## Contributing to stress-ng: Send patches to colin.i.king@gmail.com or merge requests at https://github.com/ColinIanKing/stress-ng ## Quick Start Reference Guide The [Ubuntu stress-ng reference guide](https://wiki.ubuntu.com/Kernel/Reference/stress-ng) contains a brief overview and worked examples. ## Examples Run 4 CPU, 2 virtual memory, 1 disk and 8 fork stressors for 2 minutes and print measurements: ``` stress-ng --cpu 4 --vm 2 --hdd 1 --fork 8 --timeout 2m --metrics stress-ng: info: [573366] setting to a 120 second (2 mins, 0.00 secs) run per stressor stress-ng: info: [573366] dispatching hogs: 4 cpu, 2 vm, 1 hdd, 8 fork stress-ng: info: [573366] successful run completed in 123.78s (2 mins, 3.78 secs) stress-ng: info: [573366] stressor bogo ops real time usr time sys time bogo ops/s bogo ops/s CPU used per stress-ng: info: [573366] (secs) (secs) (secs) (real time) (usr+sys time) instance (%) stress-ng: info: [573366] cpu 515396 120.00 453.02 0.18 4294.89 1137.24 94.42 stress-ng: info: [573366] vm 2261023 120.01 223.80 1.80 18840.15 10022.27 93.99 stress-ng: info: [573366] hdd 367558 123.78 10.63 11.67 2969.49 16482.42 18.02 stress-ng: info: [573366] fork 598058 120.00 68.24 65.88 4983.80 4459.13 13.97 ``` Run matrix stressor on all online CPUs for 60 seconds and measure temperature: ``` stress-ng --matrix -1 --tz -t 60 stress-ng: info: [1171459] setting to a 60 second run per stressor stress-ng: info: [1171459] dispatching hogs: 8 matrix stress-ng: info: [1171459] successful run completed in 60.01s (1 min, 0.01 secs) stress-ng: info: [1171459] matrix: stress-ng: info: [1171459] acpitz0 75.00 C (348.15 K) stress-ng: info: [1171459] acpitz1 75.00 C (348.15 K) stress-ng: info: [1171459] pch_skylake 60.17 C (333.32 K) stress-ng: info: [1171459] x86_pkg_temp 62.72 C (335.87 K) ``` Run a mix of 4 I/O stressors and check for changes in disk S.M.A.R.T. metadata: ``` sudo stress-ng --iomix 4 --smart -t 30s stress-ng: info: [1171471] setting to a 30 second run per stressor stress-ng: info: [1171471] dispatching hogs: 4 iomix stress-ng: info: [1171471] successful run completed in 30.37s stress-ng: info: [1171471] Device ID S.M.A.R.T. Attribute Value Change stress-ng: info: [1171471] sdc 01 Read Error Rate 88015771 71001 stress-ng: info: [1171471] sdc 07 Seek Error Rate 59658169 92 stress-ng: info: [1171471] sdc c3 Hardware ECC Recovered 88015771 71001 stress-ng: info: [1171471] sdc f1 Total LBAs Written 481904395 877 stress-ng: info: [1171471] sdc f2 Total LBAs Read 3768039248 5139 stress-ng: info: [1171471] sdd be Temperature Difference 3670049 1 ``` Benchmark system calls using the VDSO: ``` stress-ng --vdso 1 -t 5 --metrics stress-ng: info: [1171584] setting to a 5 second run per stressor stress-ng: info: [1171584] dispatching hogs: 1 vdso stress-ng: info: [1171585] stress-ng-vdso: exercising vDSO functions: clock_gettime time gettimeofday getcpu stress-ng: info: [1171585] stress-ng-vdso: 9.88 nanoseconds per call (excluding 1.73 nanoseconds test overhead) stress-ng: info: [1171584] successful run completed in 5.10s stress-ng: info: [1171584] stressor bogo ops real time usr time sys time bogo ops/s bogo ops/s CPU used per stress-ng: info: [1171584] (secs) (secs) (secs) (real time) (usr+sys time) instance (%) stress-ng: info: [1171584] vdso 430633496 5.10 5.10 0.00 84375055.96 84437940.39 99.93 stress-ng: info: [1171584] vdso 9.88 nanoseconds per call (average per stressor) ``` Generate and measure branch misses using perf metrics: ``` sudo stress-ng --branch 1 --perf -t 10 | grep Branch stress-ng: info: [1171714] 604,703,327 Branch Instructions 53.30 M/sec stress-ng: info: [1171714] 598,760,234 Branch Misses 52.77 M/sec (99.02%) ``` Run permutations of I/O stressors on a ZFS file system, excluding the rawdev stressor with kernel log error checking: ``` stress-ng --class io --permute 0 -x rawdev -t 1m --vmstat 1 --klog-check --temp-path /zfs-pool/test ``` x86 only: measure power using the RAPL interfaces on 8 concurrent 3D matrix stressors with verification enabled. Note that reading RAPL requires root permission. ``` sudo stress-ng --matrix-3d 8 --matrix-3d-size 512 --rapl -t 10 --verify stress-ng: info: [4563] setting to a 10 secs run per stressor stress-ng: info: [4563] dispatching hogs: 8 matrix-3d stress-ng: info: [4563] matrix-3d: stress-ng: info: [4563] core 6.11 W stress-ng: info: [4563] dram 2.71 W stress-ng: info: [4563] pkg-0 8.20 W stress-ng: info: [4563] psys 16.90 W stress-ng: info: [4563] uncore 0.06 W stress-ng: info: [4563] skipped: 0 stress-ng: info: [4563] passed: 8: matrix-3d (8) stress-ng: info: [4563] failed: 0 stress-ng: info: [4563] metrics untrustworthy: 0 stress-ng: info: [4563] successful run completed in 11.38 secs ``` Measure C-state residency: ``` stress-ng --intmath 0 -t 1m --c-states stress-ng: info: [6998] setting to a 1 min run per stressor stress-ng: info: [6998] dispatching hogs: 8 intmath stress-ng: info: [6998] intmath: stress-ng: info: [6998] C0 99.98% stress-ng: info: [6998] C1 0.00% stress-ng: info: [6998] C1E 0.01% stress-ng: info: [6998] C3 0.00% stress-ng: info: [6998] C6 0.01% stress-ng: info: [6998] C7s 0.00% stress-ng: info: [6998] C8 0.00% stress-ng: info: [6998] POLL 0.00% stress-ng: info: [6998] skipped: 0 stress-ng: info: [6998] passed: 8: intmath (8) stress-ng: info: [6998] failed: 0 stress-ng: info: [6998] metrics untrustworthy: 0 stress-ng: info: [6998] successful run completed in 1 min ``` ## Bugs and regressions found with stress-ng stress-ng has found various Kernel, QEMU bugs/regressions, and libc bugs; appropriate fixes have been landed to address these issues: 2015: * [KEYS: ensure we free the assoc array edit if edit is valid](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca4da5dd1f99fe9c59f1709fb43e818b18ad20e0) * [proc: fix -ESRCH error when writing to /proc/$pid/coredump_filter](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=41a0c249cb8706a2efa1ab3d59466b23a27d0c8b) * [SMP divide error](https://bugs.centos.org/view.php?id=14366) 2016: * [fs/locks.c: kernel oops during posix lock stress test](https://lkml.org/lkml/2016/11/27/212) * [sched/core: Fix a race between try_to_wake_up() and a woken up task](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=135e8c9250dd5c8c9aae5984fde6f230d0cbfeaf) * [devpts: fix null pointer dereference on failed memory allocation](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5353ed8deedee9e5acb9f896e9032158f5d998de) * [arm64: do not enforce strict 16 byte alignment to stack pointer](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e6d9a52543338603e25e71e0e4942f05dae0dd8a) 2017: * [ARM: dts: meson8b: add reserved memory zone to fix silent freezes](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b9b4bf504c9e94fe38b93aa2784991c80cebcf2e) * [ARM64: dts: meson-gx: Add firmware reserved memory zones](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bba8e3f42736cf7f974968a818e53b128286ad1d) * [ext4: lock the xattr block before checksuming it](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dac7a4b4b1f664934e8b713f529b629f67db313c) * [rcu_preempt detected stalls on CPUs/tasks](https://lkml.org/lkml/2017/8/28/574) * [BUG: unable to handle kernel NULL pointer dereference](https://lkml.org/lkml/2017/10/30/247) * [WARNING: possible circular locking dependency detected](https://www.spinics.net/lists/kernel/msg2679315.html) 2018: * [Illumos: ofdlock(): assertion failed: lckdat->l_start == 0](https://www.illumos.org/issues/9061) * [debugobjects: Use global free list in __debug_check_no_obj_freed()](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1ea9b98b007a662e402551a41a4413becad40a65) * [ext4_validate_inode_bitmap:99: comm stress-ng: Corrupt inode bitmap](https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1780137) * [virtio/s390: fix race in ccw_io_helper()](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=78b1a52e05c9db11d293342e8d6d8a230a04b4e7) 2019: * [mm/page_idle.c: fix oops because end_pfn is larger than max_pfn](https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/mm/page_idle.c?id=d96d6145d9796d5f1eac242538d45559e9a23404) * [mm: compaction: avoid 100% CPU usage during compaction when a task is killed](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=670105a25608affe01cb0ccdc2a1f4bd2327172b) * [mm/vmalloc.c: preload a CPU with one object for split purpose](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=82dd23e84be3ead53b6d584d836f51852d1096e6) * [perf evlist: Use unshare(CLONE_FS) in sb threads to let setns(CLONE_NEWNS) work](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b397f8468fa27f08b83b348ffa56a226f72453af) * [riscv: reject invalid syscalls below -1](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=556f47ac6083d778843e89aa21b1242eee2693ed) 2020: * [RISC-V: Don't allow write+exec only page mapping request in mmap](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e0d17c842c0f824fd4df9f4688709fc6907201e1) * [riscv: set max_pfn to the PFN of the last page](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c749bb2d554825e007cbc43b791f54e124dadfce) * [crypto: hisilicon - update SEC driver module parameter](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=57b1aac1b426b7255afa195298ed691ffea204c6) * [net: atm: fix update of position index in lec_seq_next](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2f71e00619dcde3d8a98ba3e7f52e98282504b7d) * [sched/debug: Fix memory corruption caused by multiple small reads of flags](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8d4d9c7b4333abccb3bf310d76ef7ea2edb9828f) * [ocfs2: ratelimit the 'max lookup times reached' notice](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=45680967ee29e67b62e6800a8780440b840a0b1f) * [using perf can crash kernel with a stack overflow](https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875941) * [stress-ng on gcov enabled focal kernel triggers OOPS](https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1879470) * [kernel bug list_del corruption on s390x from stress-ng mknod and stress-ng symlink](https://bugzilla.redhat.com/show_bug.cgi?id=1849196) 2021: * [sparc64: Fix opcode filtering in handling of no fault loads](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e5e8b80d352ec999d2bba3ea584f541c83f4ca3f) * [opening a file with O_DIRECT on a file system that does not support it will leave an empty file](https://bugzilla.kernel.org/show_bug.cgi?id=213041) * [locking/atomic: sparc: Fix arch_cmpxchg64_local()](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e1088760cfe0bb1fdb1f0bd155bfd52f080683a) * [btrfs: fix exhaustion of the system chunk array due to concurrent allocations](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=986aa0f276752ca4809f95b260f59fafef01a6a7) * [btrfs: rework chunk allocation to avoid exhaustion of the system chunk array](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=79bd37120b149532af5b21953643ed74af69654f) * [btrfs: fix deadlock with concurrent chunk allocations involving system chunks](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1cb3db1cf383a3c7dbda1aa0ce748b0958759947) * [locking/atomic: sparc: Fix arch_cmpxchg64_local()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7e1088760cfe0bb1fdb1f0bd155bfd52f080683a) * [pipe: do FASYNC notifications for every pipe IO, not just state changes](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fe67f4dd8daa252eb9aa7acb61555f3cc3c1ce4c) * [io-wq: remove GFP_ATOMIC allocation off schedule out path](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d3e9f732c415cf22faa33d6f195e291ad82dc92e) * [mm/swap: consider max pages in iomap_swapfile_add_extent](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=36ca7943ac18aebf8aad4c50829eb2ea5ec847df) * [block: loop: fix deadlock between open and remove](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=990e78116d38059c9306cf0560c1c4ed1cf358d3) * [tmpfs: O_DIRECT | O_CREATE open reports open failure but actually creates a file](https://bugzilla.kernel.org/show_bug.cgi?id=218049) 2022: * [copy_process(): Move fd_install() out of sighand->siglock critical section](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ddc204b517e60ae64db34f9832dc41dafa77c751) * [minix: fix bug when opening a file with O_DIRECT](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9ce3c0d26c42d279b6c378a03cd6a61d828f19ca) * [arch/arm64: Fix topology initialization for core scheduling](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5524cbb1bfcdff0cad0aaa9f94e6092002a07259) * [running stress-ng on Minux 3.4.0-RC6 on amd64 assert in vm/region.c:313](https://github.com/Stichting-MINIX-Research-Foundation/minix/issues/333) * [unshare test triggers unhandled page fault](https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1959215) * [request_module DoS](https://www.spinics.net/lists/kernel/msg4349826.html) * [NUMA Benchmark Regression In Linux 5.18](https://lore.kernel.org/lkml/YmrWK%2FKoU1zrAxPI@fuller.cnet) * [Underflow in mas_spanning_rebalance() and test](https://lore.kernel.org/linux-mm/20220625003854.1230114-1-Liam.Howlett@oracle.com/) * [mm/huge_memory: do not clobber swp_entry_t during THP split](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=71e2d666ef85d51834d658830f823560c402b8b6) * [AppArmor: -42.5% regression of stress-ng.kill.ops_per_sec due to commit](https://lkml.org/lkml/2022/12/31/27) * [clocksource: Suspend the watchdog temporarily when high read lantency detected](https://lore.kernel.org/lkml/20221220082512.186283-1-feng.tang@intel.com/t/) 2023: * [qemu-system-m68k segfaults on opcode 0x4848](https://gitlab.com/qemu-project/qemu/-/issues/1462) * [rtmutex: Ensure that the top waiter is always woken up](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=db370a8b9f67ae5f17e3d5482493294467784504) * [mm/swap: fix swap_info_struct race between swapoff and get_swap_pages()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6fe7d6b992113719e96744d974212df3fcddc76c) * [block, bfq: Fix division by zero error on zero wsum](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e53413f8deedf738a6782cc14cc00bd5852ccf18) * [riscv: mm: Ensure prot of VM_WRITE and VM_EXEC must be readable](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6569fc12e442ea973d96db39e542aa19a7bc3a79) * [Revert "mm: vmscan: make global slab shrink lockless"](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=71c3ad65fabec9620d3f548b2da948c79c7ad9d5) * [crash/hang in mm/swapfile.c:718 add_to_avail_list when exercising stress-ng](https://bugzilla.kernel.org/show_bug.cgi?id=217738) * [mm: fix zswap writeback race condition](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=04fc7816089c5a32c29a04ec94b998e219dfb946) * [x86/fpu: Set X86_FEATURE_OSXSAVE feature after enabling OSXSAVE in CR4](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2c66ca3949dc701da7f4c9407f2140ae425683a5) * [kernel/fork: beware of __put_task_struct() calling context](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d243b34459cea30cfe5f3a9b2feb44e7daff9938) * [arm64: dts: ls1028a: add l1 and l2 cache info](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fcf7ff67a2aa6d8055b9b815ad8a28a5231afa1e) * [filemap: add filemap_map_order0_folio() to handle order0 folio](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c8be03806738c86521dbf1e0503bc90855fb99a3) * [mm: shrinker: add infrastructure for dynamically allocating shrinker](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c42d50aefd17a6bad3ed617769edbbb579137545) * [mm: shrinker: make global slab shrink lockless](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca1d36b823944f24b5755311e95883fb5fdb807b) * [bcachefs: Clear btree_node_just_written() when node reused or evicted](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0b438c5bfaebda3fdf6edc35d9572d4e2f66aef1) * [tracing: Fix incomplete locking when disabling buffered events](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7fed14f7ac9cf5e38c693836fe4a874720141845) * [mm: migrate: fix getting incorrect page mapping during page migration](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d1adb25df7111de83b64655a80b5a135adbded61) * [mm: mmap: map MAP_STACK to VM_NOHUGEPAGE](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c4608d1bf7c6536d1a3d233eb21e50678681564e) 2024: * [fs: improve dump_mapping() robustness](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8b3d838139bcd1e552f1899191f734264ce2a1a5) * [tracing: Ensure visibility when inserting an element into tracing_map](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2b44760609e9eaafc9d234a6883d042fc21132a7) * [connector/cn_proc: revert "connector: Fix proc_event_num_listeners count not cleared"](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8929f95b2b587791a7dcd04cc91520194a76d3a6) * [powerpc/pseries: fix accuracy of stolen time](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cbecc9fcbbec60136b0180ba0609c829afed5c81) * [OpenBSD: libm: segfault in sincosl](https://marc.info/?l=openbsd-bugs&m=171453603728385&w=2) * [opening and closing /dev/dri/card0 in a QEMU KVM instance will shutdown system, 6.10.0-rc6+](https://bugzilla.kernel.org/show_bug.cgi?id=219007) * [uprobes: prevent mutex_lock() under rcu_read_lock()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=699646734ab51bf5b1cd4a7a30c20074f6e74f6e) * [system lock up with RT kernel on amd64](https://bugs.launchpad.net/ubuntu-realtime/+bug/2068900) * [WARNING: CPU: 17 PID: 118273 at kernel/sched/deadline.c:794 setup_new_dl_entity+0x12c/0x1e8](https://bugs.launchpad.net/ubuntu-realtime/+bug/2068720) * [kernel oops in pick_next_task_fair in 6.8.1-1002-realtime kernel](https://bugs.launchpad.net/ubuntu-realtime/+bug/2068615) * [kernel oops in aafs_create in 6.8.1-1002-realtime kernel](https://bugs.launchpad.net/ubuntu-realtime/+bug/2068602) * [mm: optimize the redundant loop](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cf3f9a593dab87a032d2b6a6fb205e7f3de4f0a1) * [MultiVM - L2 guest(s) running stress-ng getting stuck at booting after triggering crash](https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2077722) * [powerpc/qspinlock: Fix deadlock in MCS queue](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=734ad0af3609464f8f93e00b6c0de1e112f44559) * [kernel regression with ext4 and ea_inode mount flags and exercising xattrs](https://bugs.launchpad.net/linux/+bug/2080853) * [sched_ext: TASK_DEAD tasks must be switched into SCX on ops_enable](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a8532fac7b5d27b8d62008a89593dccb6f9786ef) * [sched/deadline: Fix task_struct reference leak](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b58652db66c910c2245f5bee7deca41c12d707b9) * [sched_ext: Split the global DSQ per NUMA node](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b7b3b2dbae73b412c2d24b3d0ebf1110991e4510) * [calling getcpu with misaligned address causes kernel panic](https://bugzilla.kernel.org/show_bug.cgi?id=219339) * [cygwin: pread/pwrite: prevent EBADF error after fork()](https://sourceware.org/pipermail/cygwin-patches/2024q3/012793.html) * [cygwin 3.5.4-1: signal handling destroys 'long double' values](https://sourceware.org/pipermail/cygwin/2024-October/256503.html) * [cygwin: timer_delete: Fix return value](https://sourceware.org/pipermail/cygwin-patches/2024q4/012803.html) * [cygwin: change pthread_sigqueue() to accept thread id](https://cygwin.com/git/?p=newlib-cygwin.git;a=commit;h=1e8c92e21d386d2e4a29fa92e8258979ff19ae6b) * [security/keys: fix slab-out-of-bounds in key_task_permission](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?4a74da044ec9ec8679e6beccc4306b936b62873f) * [sched_ext: Don't hold scx_tasks_lock for too long](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?b07996c7abac0fe3f70bf74b0b3f76eb7852ef5a) * [sched/numa: Fix the potential null pointer dereference in task_numa_work()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?9c70b2a33cd2aa6a5a59c5523ef053bd42265209) * [reiserfs panic using fsize stressor](https://bugzilla.kernel.org/show_bug.cgi?id=219497) * [soft-lockups: mm/page_alloc: add cond_resched in __drain_all_pages()](https://lore.kernel.org/linux-mm/3b000941-b1b6-befa-4ec9-2bff63d557c1@google.com/T/)] * [can: m_can: fix missed interrupts with m_can_pci](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=743375f8deee360b0e902074bab99b0c9368d42f) * [sched/deadline: Fix warning in migrate_enable for boosted tasks](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0664e2c311b9fa43b33e3e81429cd0c2d7f9c638) * [iomap: elide flush from partial eof zero range](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fde4c4c3ec1c1590eb09f97f9525fa7dd8df8343) * [opening /dev/snapshot twice causes oops](https://bugzilla.kernel.org/show_bug.cgi?id=219975) * [Cygwin: cygwin 3.5.4-1: lockf() aborts on overlap and does not fail on overflow](https://cygwin.com/pipermail/cygwin/2024-October/256528.html) * [Cygwin: cygwin 3.5.4-1: signal handling destroys 'long double' values](https://cygwin.com/pipermail/cygwin/2024-October/256503.html) * [Cygwin: Segfault in pthread_sigqueue() or sigtimewait()](https://cygwin.com/pipermail/cygwin/2024-November/256762.html) * [Cygwin: stress-ng --lockmix 1 crashes with *** fatal error - NtCreateEvent(lock): 0xC0000035](https://cygwin.com/pipermail/cygwin/2024-November/256750.html) * [Cygwin: SIGKILL may no longer work after many SIGCONT/SIGSTOP signals](https://cygwin.com/pipermail/cygwin/2024-November/256744.html) 2025: * [Tegra Security Engine driver improvements](https://www.spinics.net/lists/kernel/msg5546707.html) * [sched_ext: Fix lock imbalance in dispatch_to_local_dsq()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1626e5ef0b00386a4fd083fa7c46c8edbd75f9b4) * [mm/zswap: fix inconsistency when zswap_store_page() fails](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=63895d20d63b446f5049a963983489319c2ea3e2) * [LoongArch: Set max_pfn with the PFN of the last page](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c8477bb0a8e7f6b2e47952b403c5cb67a6929e55) * [net: ipv4: Fix destination address determination in flowi4_init_output](https://lkml.org/lkml/2025/5/8/536) * [Cygwin: mq_send()/mq_receive() may never return if used from threads](https://cygwin.com/pipermail/cygwin/2025-January/257120.html) * [Cygwin: mq_send(-1, ...) segfaults instead of failing with EBADF](https://cygwin.com/pipermail/cygwin/2025-January/257090.html) * [Cygwin: STATUS_HEAP_CORRUPTION if signal arrives when x86 direction flag is set](https://cygwin.com/pipermail/cygwin/2025-March/257704.html) * [Cygwin: No errno set after too many open("/dev/ptmx", ...)](https://cygwin.com/pipermail/cygwin/2025-March/257786.html) * [Cygwin: strace: infinite exception c0000005 loop on segmentation fault](https://cygwin.com/pipermail/cygwin/2025-May/258144.html) * [Cygwin: Hang or crash after multiple SIGILL or SIGSEGV and siglongjmp](https://sourceware.org/pipermail/cygwin/2025-March/257726.html) * [binder: fix use-after-free in binderfs_evict_inode()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8c0a559825281764061a127632e5ad273f0466ad) ## Kernel improvements that used stress-ng 2020: * [selinux: complete the inlining of hashtab functions](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54b27f9287a7b3dfc85549f01fc9d292c92c68b9) * [selinux: store role transitions in a hash table](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e67b2ec9f6171895e774f6543626913960e019df) * [sched/rt: Optimize checking group RT scheduler constraints](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4fb015eeff7f3e5518a7dbe8061169a3e2f2bc7) * [sched/fair: handle case of task_h_load() returning 0](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=01cfcde9c26d8555f0e6e9aea9d6049f87683998) * [sched/deadline: Unthrottle PI boosted threads while enqueuing](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=feff2e65efd8d84cf831668e182b2ce73c604bbb) * [mm: fix madvise WILLNEED performance problem](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=66383800df9cbdbf3b0c34d5a51bf35bcdb72fd2) * [powerpc/dma: Fix dma_map_ops::get_required_mask](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=437ef802e0adc9f162a95213a3488e8646e5fc03) * [stress-ng close causes kernel oops(es) v5.6-rt and v5.4-rt](https://www.spinics.net/lists/linux-rt-users/msg22350.html) 2021: * [Revert "mm, slub: consider rest of partial list if acquire_slab() fails](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9b1ea29bc0d7b94d420f96a0f4121403efc3dd85) * [mm: memory: add orig_pmd to struct vm_fault](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5db4f15c4fd7ae74dd40c6f84bf56dfcf13d10cf) * [selftests/powerpc: Add test of mitigation patching](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34f7f79827ec4db30cff9001dfba19f496473e8d) * [dm crypt: Avoid percpu_counter spinlock contention in crypt_page_alloc()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=528b16bfc3ae5f11638e71b3b63a81f9999df727) * [mm/migrate: optimize hotplug-time demotion order updates](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=295be91f7ef0027fca2f2e4788e99731aa931834) * [powerpc/rtas: rtas_busy_delay() improvements](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=38f7b7067dae0c101be573106018e8af22a90fdf) 2022: * [sched/core: Accounting forceidle time for all tasks except idle task](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b171501f258063f5c56dd2c5fdf310802d8d7dc1) * [ipc/mqueue: use get_tree_nodev() in mqueue_get_tree()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d60c4d01a98bc1942dba6e3adc02031f5519f94b) 2023: * [mm/swapfile: add cond_resched() in get_swap_pages()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7717fc1a12f88701573f9ed897cc4f6699c661e3) * [module: add debug stats to help identify memory pressure](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=df3e764d8e5cd416efee29e0de3c93917dff5d33) * [module: avoid allocation if module is already present and ready](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=064f4536d13939b6e8cdb71298ff5d657f4f8caa) * [sched: Interleave cfs bandwidth timers for improved single thread performance at low utilization](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=41abdba9374734b743019fc1cc05e3225c82ba6b) * [mm/khugepaged: remove redundant try_to_freeze()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b39ca208403c8f2c17dab1fbfef1f5ecaff25e53) 2024: * [mm/vmalloc: eliminated the lock contention from twice to once](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=aaab830ad887629156ef17097c2ad24ce6fb8177) * [mm: switch mm->get_unmapped_area() to a flag](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=529ce23a764f25d172198b4c6ba90f1e2ad17f93) * [mm: always inline _compound_head() with CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP=y](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ef5f379de302884b9b7ad9b62587a942a9f0bb55) * [mm: optimize the redundant loop of mm_update_owner_next()](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=76ba6acfcce871db13ad51c6dc8f56fec2e92853) 2025: * [sched: Add unlikey branch hints to several system calls](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1a5d3492f8e14719184945893c610e0802c05533) * [mm/mincore: improve performance by adding an unlikely hint](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9fa26fb554baaf71826814804749f5cff130c4d6) * [select: do_pollfd: add unlikely branch hint return path](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5730609ffd7e558e1e3305d0c6839044e8f6591b) * [select: core_sys_select add unlikely branch hint on return path](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6b24a702ecf167ab61456276bb72133d84ccca45) I appreciate information concerning kernel bugs or performance regressions found with stress-ng. ## Presentations * [Stress-ng presentation at ELCE 2019 Lyon](https://static.sched.com/hosted_files/osseu19/29/Lyon-stress-ng-presentation-oct-2019.pdf) * [Video of the above presentation](https://www.youtube.com/watch?v=8QaXStKfq3A) * [Linux Foundation Mentoring Session, May 2022](https://www.youtube.com/watch?v=gD3Hn02VSHA) * [Kernel Recipes presentation, Sept 2023](https://www.youtube.com/watch?v=PD0NOZCTIVQ) * [Linux Foundation, ELISA, June 2024](https://www.youtube.com/watch?v=-B1K-xpICtQ) ## Citations * [Citations](./CITATIONS.md) ## Contributors Many thanks to the following contributors to stress-ng (in alphabetical order): Abdul Haleem, Aboorva Devarajan, Adriand Martin, Adrian Ratiu, Aleksandar N. Kostadinov, Alexander Kanavin, Alexandru Ardelean, Alfonso Sánchez-Beato, Allen H, Amit Singh Tomar, Andrey Gelman, André Wild, Anisse Astier, Anton Eliasson, Arjan van de Ven, Baruch Siach, Bryan W. Lewis, Camille Constans, Carlos Santos, Christian Ehrhardt, Christian Franke, Christopher Brown, Chunyu Hu, Daniel Andriesse, Daniel Hodges, Danilo Krummrich, Davidson Francis, David Turner, Denis Ovsienko, Dmitry Antipov, Dmitry Grand, Dominik B Czarnota, Dorinda Bassey, Eder Zulian, Eric Lin, Erik Stahlman, Erwan Velu, Fabien Malfoy, Fabrice Fontaine, Fernand Sieber, Fejza Indrit, Florian Weimer, Francis Laniel, Guilherme Janczak, Hui Wang, Hsieh-Tseng Shen, Iyán Méndez Veiga, Ivan Shapovalov, James Hunt, Jan Luebbe, Jesse Huang, Jianshen Liu, Jimmy Ho, John Kacur, Julee, Jules Maselbas, Julien Olivain, Kenny Gong, Khalid Elmously, Khem Raj, Luca Pizzamiglio, Luis Chamberlain, Luis Henriques, Lukas Durfina, Matteo Italia, Matthew Tippett, Mauricio Faria de Oliveira, Maxime Chevallier, Max Kellermann, Maya Rashish, Mayuresh Chitale, Meysam Azad, Mike Koreneff, Munehisa Kamata, Myd Xia, Nick Hanley, Nicolas Bouton, Nikolas Kyx, Paul Menzel, Piyush Goyal, Ralf Ramsauer, Rosen Penev, Rulin Huang, Sascha Hauer, Sergey Fedorov, Sergey Matyukevich, Siddhesh Poyarekar, Shoily Rahman, Dominik Steinberger, Stian Onarheim, Thadeu Lima de Souza Cascardo, Thia Wyrod, Thinh Tran, Tim Gardner, Tim Gates, Tim Orling, Tommi Rantala, Witold Baryluk, Yiwei Lin, Yong-Xuan Wang, Zhiyi Sun, Zong Li. ## Static Analysis Coverity Scan Build Status