rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10002 jiffies, g=5065, q=1018 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10003 (4294953844-4294943841), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10004 jiffies! g5065 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:14720 pid:14    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x568/0x840 kernel/sched/core.c:6561
 schedule+0x50/0xb0 kernel/sched/core.c:6637
 schedule_timeout+0x111/0x180 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x185/0x510 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x18/0x100 kernel/rcu/tree.c:1905
 kthread+0xcc/0xe0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4019 Comm: syz.0.28 Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__lock_acquire+0x145/0x4b0 kernel/locking/lockdep.c:4988
Code: 58 4c 8b 44 24 48 48 8d 04 bf 89 d7 81 e7 ff 1f 00 00 4c 89 84 c3 08 0a 00 00 48 89 ac c3 10 0a 00 00 4c 89 b4 c3 18 0a 00 00 <41> c1 e5 0f 45 0f b7 c5 41 83 e4 03 41 c1 e4 10 45 09 c4 41 c1 e7
RSP: 0018:ffffc90001c13c08 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff88810ef29b40 RCX: 0000000000000000
RDX: 0000000000000538 RSI: 0000000000000000 RDI: 0000000000000538
RBP: ffff88810ef34170 R08: ffffffff81123058 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  00007fa542a056c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b81ef0e9c CR3: 000000010d37b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 reacquire_held_locks+0xe2/0x130 kernel/locking/lockdep.c:5187
 __lock_release kernel/locking/lockdep.c:5376 [inline]
 lock_release+0x163/0x2c0 kernel/locking/lockdep.c:5682
 rcu_lock_release include/linux/rcupdate.h:355 [inline]
 rcu_read_unlock include/linux/rcupdate.h:824 [inline]
 __lock_timer+0xf1/0x100 kernel/time/posix-timers.c:-1
 posixtimer_rearm+0x2b/0xe0 kernel/time/posix-timers.c:323
 dequeue_signal+0x106/0x1e0 kernel/signal.c:704
 get_signal+0x398/0x750 kernel/signal.c:2751
 arch_do_signal_or_restart+0x92/0x670 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x6b/0xd0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x64/0xb0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa541b8e967
Code: ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89
RSP: 002b:00007fa542a050e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fa541db5fa8 RCX: 00007fa541b8e969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa541db5fa8
RBP: 00007fa541db5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa541db5fac
R13: 0000000000000000 R14: 00007ffe33d83880 R15: 00007ffe33d83968
 </TASK>