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9 do_el0_svc+0x50/0x11c arch/arm64/kernel/syscall.c:217
10 el0_svc+0x20/0x30 arch/arm64/kernel/entry-common.c:353
11 el0_sync_handler+0xe4/0x1e0 arch/arm64/kernel/entry-common.c:369
12 el0_sync+0x148/0x180 arch/arm64/kernel/entry.S:683
13 ==================================================================
14 BUG: KASAN: null-ptr-deref in rq_of kernel/sched/sched.h:1118 [inline]
15 BUG: KASAN: null-ptr-deref in unthrottle_qos_sched_group kernel/sched/fair.c:7619 [inline]
16 BUG: KASAN: null-ptr-deref in free_fair_sched_group+0x124/0x320 kernel/sched/fair.c:12131
1 sched: Fix null-ptr-deref in free_fair_sched_group
2
3 hulk inclusion
4 category: bugfix
5 bugzilla: 187419
6
7 -------------------------------
8
9 do_el0_svc+0x50/0x11c arch/arm64/kernel/syscall.c:217
10 el0_svc+0x20/0x30 arch/arm64/kernel/entry-common.c:353
11 el0_sync_handler+0xe4/0x1e0 arch/arm64/kernel/entry-common.c:369
12 el0_sync+0x148/0x180 arch/arm64/kernel/entry.S:683
13 ==================================================================
14 BUG: KASAN: null-ptr-deref in rq_of kernel/sched/sched.h:1118 [inline]
15 BUG: KASAN: null-ptr-deref in unthrottle_qos_sched_group kernel/sched/fair.c:7619 [inline]
16 BUG: KASAN: null-ptr-deref in free_fair_sched_group+0x124/0x320 kernel/sched/fair.c:12131
17 Read of size 8 at addr 0000000000000130 by task syz-executor100/223
18
19 CPU: 3 PID: 223 Comm: syz-executor100 Not tainted 5.10.0 #6
20 Hardware name: linux,dummy-virt (DT)
21 Call trace:
22 dump_backtrace+0x0/0x40c arch/arm64/kernel/stacktrace.c:132
23 show_stack+0x30/0x40 arch/arm64/kernel/stacktrace.c:196
24 __dump_stack lib/dump_stack.c:77 [inline]
25 dump_stack+0x1b4/0x248 lib/dump_stack.c:118
26 __kasan_report mm/kasan/report.c:551 [inline]
27 kasan_report+0x18c/0x210 mm/kasan/report.c:564
28 check_memory_region_inline mm/kasan/generic.c:187 [inline]
29 __asan_load8+0x98/0xc0 mm/kasan/generic.c:253
30 rq_of kernel/sched/sched.h:1118 [inline]
31 unthrottle_qos_sched_group kernel/sched/fair.c:7619 [inline]
32 free_fair_sched_group+0x124/0x320 kernel/sched/fair.c:12131
33 sched_free_group kernel/sched/core.c:7767 [inline]
34 sched_create_group+0x48/0xc0 kernel/sched/core.c:7798
35 cpu_cgroup_css_alloc+0x18/0x40 kernel/sched/core.c:7930
36 css_create+0x7c/0x4a0 kernel/cgroup/cgroup.c:5328
37 cgroup_apply_control_enable+0x288/0x340 kernel/cgroup/cgroup.c:3135
38 cgroup_apply_control kernel/cgroup/cgroup.c:3217 [inline]
39 cgroup_subtree_control_write+0x668/0x8b0 kernel/cgroup/cgroup.c:3375
40 cgroup_file_write+0x1a8/0x37c kernel/cgroup/cgroup.c:3909
41 kernfs_fop_write_iter+0x220/0x2f4 fs/kernfs/file.c:296
42 call_write_iter include/linux/fs.h:1960 [inline]
43 new_sync_write+0x260/0x370 fs/read_write.c:515
44 vfs_write+0x3dc/0x4ac fs/read_write.c:602
45 ksys_write+0xfc/0x200 fs/read_write.c:655
46 __do_sys_write fs/read_write.c:667 [inline]
47 __se_sys_write fs/read_write.c:664 [inline]
48 __arm64_sys_write+0x50/0x60 fs/read_write.c:664
49 __invoke_syscall arch/arm64/kernel/syscall.c:36 [inline]
50 invoke_syscall arch/arm64/kernel/syscall.c:48 [inline]
51 el0_svc_common.constprop.0+0xf4/0x414 arch/arm64/kernel/syscall.c:155
52 do_el0_svc+0x50/0x11c arch/arm64/kernel/syscall.c:217
53 el0_svc+0x20/0x30 arch/arm64/kernel/entry-common.c:353
54 el0_sync_handler+0xe4/0x1e0 arch/arm64/kernel/entry-common.c:369
55 el0_sync+0x148/0x180 arch/arm64/kernel/entry.S:68