BUG: sleeping function called from invalid context at kernel/locking/mutex.c:623
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 9645, name: syz.0.734
preempt_count: 10000, expected: 0
RCU nest depth: 0, expected: 0
locks held by syz.0.734/9645: 0, last CPU#1
Preemption disabled at:
[<ffffffff818bae37>] percpu_up_read include/linux/percpu-rwsem.h:116 [inline]
[<ffffffff818bae37>] cgroup_threadgroup_change_end+0x87/0x210 include/linux/cgroup-defs.h:905
CPU: 1 UID: 0 PID: 9645 Comm: syz.0.734 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 __might_resched+0x36a/0x4c0 kernel/sched/core.c:9236
 __mutex_lock_common kernel/locking/mutex.c:623 [inline]
 __mutex_lock+0x118/0x1550 kernel/locking/mutex.c:821
 posix_cpu_timer_wait_running+0x1d3/0x330 kernel/time/posix-cpu-timers.c:1218
 timer_wait_running kernel/time/posix-timers.c:868 [inline]
 posix_timer_delete+0x349/0x490 kernel/time/posix-timers.c:1061
 exit_itimers+0x1eb/0x3a0 kernel/time/posix-timers.c:1104
 do_exit+0x489/0x2360 kernel/exit.c:967
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1151
 get_signal+0x121b/0x12c0 kernel/signal.c:3039
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c68b9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6c69a770e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f6c68e26098 RCX: 00007f6c68b9e0d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6c68e26098
RBP: 00007f6c68e26090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c68e26128 R14: 00007ffeb1913c90 R15: 00007ffeb1913d78
 </TASK>