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openEuler 24.03 (LTS-SP1) cgroup v2下执行ltp概率出现hung_task
已完成
#ICN7UH
缺陷
高英杰
创建于
2025-07-18 14:25
**【缺陷描述】:openEuler 24.03 (LTS-SP1) cgroup v2下执行ltp概率出现hung_task** **一、缺陷信息** **【缺陷所属的os版本】openEuler 24.03 (LTS-SP1)** **【内核版本】6.6.0-89.0.0.94.oe2403sp1.aarch64** **【缺陷所属软件及版本号】kernel-6.6.0-89.0.0.94.oe2403sp1.aarch64** **【环境信息】** 物理机、虚拟机 x86、arm、loongarch都能复现该问题 软件信息 使用20240524ltp进行测试 **【问题复现步骤】:** 1. 添加命令行参数 systemd.unified_cgroup_hierarchy=1 后重启,确保使用cgroup v2 2. 编译安装20240524版本的ltp 3. ltp安装路径添加 runtest/mytest文件,文件内容为: cgroup_fj_function_perf_event cgroup_fj_function.sh perf_event cgroup_fj_function_net_prio cgroup_fj_function.sh net_prio 4. ltp安装路径下执行 ./runltp -f mytest -I 1000 5. 几分钟内可以复现到有进程发生hung_task [root@ltptest ~]# ps -aux | awk '$8 ~ "D"' root 466 0.0 0.0 0 0 ? D 14:02 0:00 [kworker/1:3+cgroup_destroy] root 3926 0.0 0.0 0 0 ? D 14:11 0:00 [kworker/2:2+cgroup_destroy] root 4904 0.0 0.0 2476 1372 pts/0 D 14:11 0:00 tst_cgctl require net_prio 4882 [root@ltptest ltp]# cat /proc/466/stack [<0>] cgroup_lock_and_drain_offline+0x14c/0x1e8 [<0>] cgroup_destroy_root+0x3c/0x2c0 [<0>] css_free_rwork_fn+0x248/0x338 [<0>] process_one_work+0x16c/0x3b8 [<0>] worker_thread+0x22c/0x3b0 [<0>] kthread+0xec/0x100 [<0>] ret_from_fork+0x10/0x20 [root@ltptest ltp]# cat /proc/3926/stack [<0>] cgroup_lock_and_drain_offline+0x14c/0x1e8 [<0>] cgroup_destroy_root+0x3c/0x2c0 [<0>] css_free_rwork_fn+0x248/0x338 [<0>] process_one_work+0x16c/0x3b8 [<0>] worker_thread+0x22c/0x3b0 [<0>] kthread+0xec/0x100 [<0>] ret_from_fork+0x10/0x20 [root@ltptest ltp]# cat /proc/4904/stack [<0>] cgroup_lock_and_drain_offline+0x14c/0x1e8 [<0>] cgroup1_get_tree+0x44/0x230 [<0>] vfs_get_tree+0x30/0xf8 [<0>] do_new_mount+0x1b0/0x310 [<0>] path_mount+0x1c4/0x2c0 [<0>] __arm64_sys_mount+0x11c/0x150 [<0>] invoke_syscall+0x50/0x128 [<0>] el0_svc_common.constprop.0+0xc8/0xf0 [<0>] do_el0_svc+0x24/0x38 [<0>] el0_svc+0x44/0x1b8 [<0>] el0t_64_sync_handler+0x100/0x130 [<0>] el0t_64_sync+0x188/0x190 **【期望结果】**,执行ltp压测不发生如上hung_task **【缺陷详情及分析指导参考链接】** 换用anolis、kos、upstream 内核压测相同项可以十几小时内不复现。 下面是当前分析进展: 使用以下c程序也可以复现 cgroup_mount_test.c ```c #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <sys/mount.h> #include <sys/stat.h> #include <unistd.h> #define LOOPS 10000 #define TMPDIR "/tmp" #define CGROUP_BASE "ltp_cgtest" #define CONTROLLERS_COUNT 2 const char *controllers[CONTROLLERS_COUNT] = {"perf_event", "net_prio"}; void safe_mkdir(const char *path) { if (mkdir(path, 0777) == -1 && errno != EEXIST) { fprintf(stderr, "mkdir(%s) failed: %s\n", path, strerror(errno)); exit(1); } } void safe_rmdir(const char *path) { if (rmdir(path) == -1 && errno != ENOENT) { fprintf(stderr, "rmdir(%s) failed: %s\n", path, strerror(errno)); } } int is_mounted(const char *mnt) { FILE *fp = fopen("/proc/mounts", "r"); if (!fp) return 0; char line[512]; int found = 0; while (fgets(line, sizeof(line), fp)) { if (strstr(line, mnt)) { found = 1; break; } } fclose(fp); return found; } int main(void) { if (getuid() != 0) { fprintf(stderr, "This program must be run as root\n"); return 1; } FILE *fcg = fopen("/proc/cgroups", "r"); if (!fcg) { fprintf(stderr, "Kernel does not support cgroups\n"); return 1; } fclose(fcg); char mnt[256]; for (int i = 1; i <= LOOPS; ++i) { for (int c = 0; c < CONTROLLERS_COUNT; ++c) { snprintf(mnt, sizeof(mnt), "%s/cgroup_%s", TMPDIR, controllers[c]); printf("=== Loop %d: %s ===\n", i, controllers[c]); fflush(stdout); safe_mkdir(mnt); if (!is_mounted(mnt)) { if (mount(controllers[c], mnt, "cgroup", 0, controllers[c]) == -1) { fprintf(stderr, "Failed to mount cgroup v1 for %s at %s: %s\n", controllers[c], mnt, strerror(errno)); safe_rmdir(mnt); continue; } } // 这里可以插入你需要的cgroup操作或测试 if (umount2(mnt, 0) == -1) { fprintf(stderr, "umount(%s) failed: %s\n", mnt, strerror(errno)); } safe_rmdir(mnt); } } return 0; } ``` ```Makefile CC = gcc CFLAGS = -Wall -O2 all: cgroup_mount_test cgroup_mount_test: cgroup_mount_test.c $(CC) $(CFLAGS) -o cgroup_mount_test cgroup_mount_test.c clean: rm -f cgroup_mount_test ``` 复现场景 在 cgroup v2 环境下,通过程序对 perf_event cgroup 子系统与下列任意一个 cgroup 子系统(如 cpuset、cpuacct、blkio、devices、freezer、net_cls、net_prio、hugetlb、rdma、misc)进行频繁的挂载和卸载(即循环 mount/umount),很容易复现该问题。 复现与规避 在 cgroup v1 环境下,若 perf_event 或 net_prio 已被挂载,频繁 mount/umount 通常不会复现该问题。但如果手动卸载 perf_event 或 net_prio 后再运行复现脚本,同样可以复现该问题。 在 cgroup v2 环境下,在每次 umount 操作后加入 0.5 秒的延迟,可以显著降低复现概率,将复现所需的循环次数提升到上万次。 其他发行版 6.6 内核的复现情况 - 使用上述C 程序循环挂载、卸载 perf_event 和 net_prio 两个 cgroup 子系统时,Kylin(KOS)、Anolis、Euler 以及上游内核均可在几秒钟内复现该问题。 - 使用 LTP 程序单独测试 cgroup_fj_function_perf_event 或 cgroup_fj_function_net_prio 时,Euler内核能很快复现该问题,而 KOS、Anolis 及上游内核则可以持续运行十几个小时不复现。 **二、缺陷分析结构反馈** 影响性分析说明: 缺陷严重等级:(Critical/High/Moderate/Low) 缺陷根因说明: 受影响版本排查(受影响/不受影响): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 openEuler-24.03-LTS-SP2 修复是否涉及abi变化(是/否): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 openEuler-24.03-LTS-SP2
**【缺陷描述】:openEuler 24.03 (LTS-SP1) cgroup v2下执行ltp概率出现hung_task** **一、缺陷信息** **【缺陷所属的os版本】openEuler 24.03 (LTS-SP1)** **【内核版本】6.6.0-89.0.0.94.oe2403sp1.aarch64** **【缺陷所属软件及版本号】kernel-6.6.0-89.0.0.94.oe2403sp1.aarch64** **【环境信息】** 物理机、虚拟机 x86、arm、loongarch都能复现该问题 软件信息 使用20240524ltp进行测试 **【问题复现步骤】:** 1. 添加命令行参数 systemd.unified_cgroup_hierarchy=1 后重启,确保使用cgroup v2 2. 编译安装20240524版本的ltp 3. ltp安装路径添加 runtest/mytest文件,文件内容为: cgroup_fj_function_perf_event cgroup_fj_function.sh perf_event cgroup_fj_function_net_prio cgroup_fj_function.sh net_prio 4. ltp安装路径下执行 ./runltp -f mytest -I 1000 5. 几分钟内可以复现到有进程发生hung_task [root@ltptest ~]# ps -aux | awk '$8 ~ "D"' root 466 0.0 0.0 0 0 ? D 14:02 0:00 [kworker/1:3+cgroup_destroy] root 3926 0.0 0.0 0 0 ? D 14:11 0:00 [kworker/2:2+cgroup_destroy] root 4904 0.0 0.0 2476 1372 pts/0 D 14:11 0:00 tst_cgctl require net_prio 4882 [root@ltptest ltp]# cat /proc/466/stack [<0>] cgroup_lock_and_drain_offline+0x14c/0x1e8 [<0>] cgroup_destroy_root+0x3c/0x2c0 [<0>] css_free_rwork_fn+0x248/0x338 [<0>] process_one_work+0x16c/0x3b8 [<0>] worker_thread+0x22c/0x3b0 [<0>] kthread+0xec/0x100 [<0>] ret_from_fork+0x10/0x20 [root@ltptest ltp]# cat /proc/3926/stack [<0>] cgroup_lock_and_drain_offline+0x14c/0x1e8 [<0>] cgroup_destroy_root+0x3c/0x2c0 [<0>] css_free_rwork_fn+0x248/0x338 [<0>] process_one_work+0x16c/0x3b8 [<0>] worker_thread+0x22c/0x3b0 [<0>] kthread+0xec/0x100 [<0>] ret_from_fork+0x10/0x20 [root@ltptest ltp]# cat /proc/4904/stack [<0>] cgroup_lock_and_drain_offline+0x14c/0x1e8 [<0>] cgroup1_get_tree+0x44/0x230 [<0>] vfs_get_tree+0x30/0xf8 [<0>] do_new_mount+0x1b0/0x310 [<0>] path_mount+0x1c4/0x2c0 [<0>] __arm64_sys_mount+0x11c/0x150 [<0>] invoke_syscall+0x50/0x128 [<0>] el0_svc_common.constprop.0+0xc8/0xf0 [<0>] do_el0_svc+0x24/0x38 [<0>] el0_svc+0x44/0x1b8 [<0>] el0t_64_sync_handler+0x100/0x130 [<0>] el0t_64_sync+0x188/0x190 **【期望结果】**,执行ltp压测不发生如上hung_task **【缺陷详情及分析指导参考链接】** 换用anolis、kos、upstream 内核压测相同项可以十几小时内不复现。 下面是当前分析进展: 使用以下c程序也可以复现 cgroup_mount_test.c ```c #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <sys/mount.h> #include <sys/stat.h> #include <unistd.h> #define LOOPS 10000 #define TMPDIR "/tmp" #define CGROUP_BASE "ltp_cgtest" #define CONTROLLERS_COUNT 2 const char *controllers[CONTROLLERS_COUNT] = {"perf_event", "net_prio"}; void safe_mkdir(const char *path) { if (mkdir(path, 0777) == -1 && errno != EEXIST) { fprintf(stderr, "mkdir(%s) failed: %s\n", path, strerror(errno)); exit(1); } } void safe_rmdir(const char *path) { if (rmdir(path) == -1 && errno != ENOENT) { fprintf(stderr, "rmdir(%s) failed: %s\n", path, strerror(errno)); } } int is_mounted(const char *mnt) { FILE *fp = fopen("/proc/mounts", "r"); if (!fp) return 0; char line[512]; int found = 0; while (fgets(line, sizeof(line), fp)) { if (strstr(line, mnt)) { found = 1; break; } } fclose(fp); return found; } int main(void) { if (getuid() != 0) { fprintf(stderr, "This program must be run as root\n"); return 1; } FILE *fcg = fopen("/proc/cgroups", "r"); if (!fcg) { fprintf(stderr, "Kernel does not support cgroups\n"); return 1; } fclose(fcg); char mnt[256]; for (int i = 1; i <= LOOPS; ++i) { for (int c = 0; c < CONTROLLERS_COUNT; ++c) { snprintf(mnt, sizeof(mnt), "%s/cgroup_%s", TMPDIR, controllers[c]); printf("=== Loop %d: %s ===\n", i, controllers[c]); fflush(stdout); safe_mkdir(mnt); if (!is_mounted(mnt)) { if (mount(controllers[c], mnt, "cgroup", 0, controllers[c]) == -1) { fprintf(stderr, "Failed to mount cgroup v1 for %s at %s: %s\n", controllers[c], mnt, strerror(errno)); safe_rmdir(mnt); continue; } } // 这里可以插入你需要的cgroup操作或测试 if (umount2(mnt, 0) == -1) { fprintf(stderr, "umount(%s) failed: %s\n", mnt, strerror(errno)); } safe_rmdir(mnt); } } return 0; } ``` ```Makefile CC = gcc CFLAGS = -Wall -O2 all: cgroup_mount_test cgroup_mount_test: cgroup_mount_test.c $(CC) $(CFLAGS) -o cgroup_mount_test cgroup_mount_test.c clean: rm -f cgroup_mount_test ``` 复现场景 在 cgroup v2 环境下,通过程序对 perf_event cgroup 子系统与下列任意一个 cgroup 子系统(如 cpuset、cpuacct、blkio、devices、freezer、net_cls、net_prio、hugetlb、rdma、misc)进行频繁的挂载和卸载(即循环 mount/umount),很容易复现该问题。 复现与规避 在 cgroup v1 环境下,若 perf_event 或 net_prio 已被挂载,频繁 mount/umount 通常不会复现该问题。但如果手动卸载 perf_event 或 net_prio 后再运行复现脚本,同样可以复现该问题。 在 cgroup v2 环境下,在每次 umount 操作后加入 0.5 秒的延迟,可以显著降低复现概率,将复现所需的循环次数提升到上万次。 其他发行版 6.6 内核的复现情况 - 使用上述C 程序循环挂载、卸载 perf_event 和 net_prio 两个 cgroup 子系统时,Kylin(KOS)、Anolis、Euler 以及上游内核均可在几秒钟内复现该问题。 - 使用 LTP 程序单独测试 cgroup_fj_function_perf_event 或 cgroup_fj_function_net_prio 时,Euler内核能很快复现该问题,而 KOS、Anolis 及上游内核则可以持续运行十几个小时不复现。 **二、缺陷分析结构反馈** 影响性分析说明: 缺陷严重等级:(Critical/High/Moderate/Low) 缺陷根因说明: 受影响版本排查(受影响/不受影响): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 openEuler-24.03-LTS-SP2 修复是否涉及abi变化(是/否): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 openEuler-24.03-LTS-SP2
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openEuler-24.03-LTS-update-20250725
openEuler-24.03-LTS-SP1-update-20250725
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openEuler-20.03-LTS-SP4-update-20250718
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openEuler-24.03-LTS-SP1-update-20250509
openEuler-24.03-LTS-update-20250509
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openEuler-22.03-LTS-SP3-update-20250509
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openEuler-24.03-LTS-update-20250425
openEuler-22.03-LTS-SP3-update-20250425
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openEuler-24.03-LTS-SP1-update-20250428
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openEuler-20.03-LTS-SP4-update-20250425
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openEuler-22.03-LTS-SP4-update-20250418
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openEuler-22.03-LTS-SP3-update-20250411
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openEuler-24.03-LTS-update-20250403
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openEuler-22.03-LTS-SP4-update-20250329
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openEuler-24.03-LTS-SP1-update-20250329
openEuler-24.03-LTS-update-20250329
openEuler-24.03-LTS-update-20250321
openEuler-24.03-LTS-SP1-update-20250321
openEuler-20.03-LTS-SP4-update-20250321
openEuler-24.03-LTS-update-20250314
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openEuler-22.03-LTS-SP3-update-20250314
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openEuler-24.03-LTS-update-20250307
openEuler-24.03-LTS-SP1-update-20250307
openEuler-22.03-LTS-SP3-update-20250307
openEuler-22.03-LTS-SP4-update-20250307
openEuler-20.03-LTS-SP4-update-20250307
openEuler-24.03-LTS-update-20250228
openEuler-24.03-LTS-SP1-update-20250228
openEuler-22.03-LTS-SP3-update-20250228
openEuler-22.03-LTS-SP4-update-20250228
openEuler-20.03-LTS-SP4-update-20250228
openEuler-24.03-LTS-SP1-update-20250221
openEuler-24.03-LTS-update-20250221
openEuler-22.03-LTS-SP4-update-20250221
openEuler-22.03-LTS-SP3-update-20250221
openEuler-20.03-LTS-SP4-update-20250221
openEuler-24.03-LTS-update-20250214
openEuler-24.03-LTS-SP1-update-20250214
openEuler-22.03-LTS-SP4-update-20250214
openEuler-22.03-LTS-SP3-update-20250214
openEuler-20.03-LTS-SP4-update-20250214
openEuler-24.03-LTS-update-20250208
openEuler-20.03-LTS-SP4-update-20250208
openEuler-22.03-LTS-SP3-update-20250208
openEuler-22.03-LTS-SP4-update-20250208
openEuler-24.03-LTS-SP1-update-20250208
openEuler-24.03-LTS-SP1-update-20250124
openEuler-22.03-LTS-SP4-update-20250124
openEuler-22.03-LTS-SP3-update-20250124
openEuler-20.03-LTS-SP4-update-20250124
openEuler-24.03-LTS-update-20250124
openEuler-22.03-LTS-SP3-update-20250117
openEuler-22.03-LTS-SP4-update-20250117
openEuler-20.03-LTS-SP4-update-20250117
openEuler-24.03-LTS-update-20250110
openEuler-24.03-LTS-SP1-update-20250110
openEuler-22.03-LTS-SP1-update-20250110
openEuler-22.03-LTS-SP3-update-20250110
openEuler-20.03-LTS-SP4-update-20250110
openEuler-22.03-LTS-SP4-update-20250110
openEuler-22.03-LTS-SP4-update-20250103
openEuler-22.03-LTS-SP3-update-20250103
openEuler-22.03-LTS-SP1-update-20250103
openEuler-20.03-LTS-SP4-update-20250103
openEuler-24.03-LTS-SP1-release
openEuler-24.03-LTS-update-20241227
openEuler-22.03-LTS-SP3-update-20241227
openEuler-22.03-LTS-SP4-update-20241227
openEuler-20.03-LTS-SP4-update-20241227
openEuler-22.03-LTS-SP4-update-20241220
openEuler-22.03-LTS-SP3-update-20241220
openEuler-20.03-LTS-SP4-update-20241220
openEuler-24.03-LTS-update-20241213
openEuler-22.03-LTS-SP4-update-20241213
openEuler-22.03-LTS-SP3-update-20241213
openEuler-22.03-LTS-SP1-update-20241213
openEuler-20.03-LTS-SP4-update-20241213
openEuler-24.03-LTS-update-20241206
openEuler-22.03-LTS-SP4-update-20241206
openEuler-22.03-LTS-SP3-update-20241206
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openEuler-20.03-LTS-SP4-update-20241206
openEuler-20.03-LTS-SP4-update-20241129
openEuler-22.03-LTS-SP1-update-20241129
openEuler-22.03-LTS-SP3-update-20241129
openEuler-22.03-LTS-SP4-update-20241129
openEuler-24.03-LTS-update-20241129
openEuler-24.03-LTS-update-20241122
openEuler-22.03-LTS-SP4-update-20241122
openEuler-22.03-LTS-SP3-update-20241122
openEuler-22.03-LTS-SP1-update-20241122
openEuler-20.03-LTS-SP4-update-20241122
openEuler-20.03-LTS-SP4-update-20241115
openEuler-22.03-LTS-SP1-update-20241115
openEuler-22.03-LTS-SP3-update-20241115
openEuler-22.03-LTS-SP4-update-20241115
openEuler-24.03-LTS-update-20241115
openEuler-24.03-LTS-update-20241108
openEuler-22.03-LTS-SP4-update-20241108
openEuler-22.03-LTS-SP3-update-20241108
openEuler-22.03-LTS-SP1-update-20241108
openEuler-20.03-LTS-SP4-update-20241108
openEuler-22.03-LTS-SP4-update-before-20241025
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openEuler-24.03-LTS-update-before-20241025
openEuler-20.03-LTS-SP4-update-20241101
openEuler-22.03-LTS-SP1-update-20241101
openEuler-22.03-LTS-SP3-update-20241101
openEuler-22.03-LTS-SP4-update-20241101
openEuler-24.03-LTS-update-20241101
openEuler-20.03-LTS-SP4-update-20241025
openEuler-22.03-LTS-SP1-update-20241025
openEuler-22.03-LTS-SP3-update-20241025
openEuler-22.03-LTS-SP4-update-20241025
openEuler-24.03-LTS-update-20241025
openEuler-22.03-LTS-SP4-release
openEuler-24.09-release
openEuler-24.03-LTS-release
openEuler-22.03-LTS-SP3-release
openEuler-23.09-rc5
openEuler-22.03-LTS-SP1-release
openEuler-22.09-release
openEuler-22.09-rc5
openEuler-22.09-20220829
openEuler-22.03-LTS-20220331
openEuler-22.03-LTS-round5
openEuler-22.03-LTS-round3
openEuler-22.03-LTS-round2
openEuler-22.03-LTS-round1
openEuler-20.03-LTS-SP3-release
openEuler-20.03-LTS-SP2-20210624
openEuler-21.03-20210330
openEuler-20.09-20200929
openEuler-20.03-LTS-20200606
openEuler-20.03-LTS-tag
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https://gitee.com/src-openeuler/kernel.git
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