rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=18013, q=579 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294962293-4294951791), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g18013 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27752 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6654 Comm: syz.3.50 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__lock_acquire+0xde7/0x7c80 kernel/locking/lockdep.c:-1
Code: 00 00 48 89 d8 48 c1 e8 03 48 89 84 24 b8 00 00 00 42 80 3c 00 00 74 12 48 89 df e8 73 c2 75 00 49 b8 00 00 00 00 00 fc ff df <48> 89 9c 24 88 00 00 00 4c 8b 3b 48 83 7c 24 60 00 75 31 48 c7 c0
RSP: 0018:ffffc900043e7740 EFLAGS: 00000046
RAX: 1ffff11004e1fc9a RBX: ffff8880270fe4d0 RCX: ffffffff81671330
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90da5508
RBP: ffffc900043e7988 R08: dffffc0000000000 R09: 1ffffffff21b4aa1
R10: dffffc0000000000 R11: fffffbfff21b4aa2 R12: ffff8880270fe4c4
R13: ffff8880270fda00 R14: ffff8880270fe508 R15: ffff8880270fe528
FS:  00007f4cb2bb26c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1aacdaa7d0 CR3: 000000005e86f000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 seqcount_lockdep_reader_access+0xca/0x1c0 include/linux/seqlock.h:102
 ktime_get+0x35/0x280 kernel/time/timekeeping.c:846
 common_hrtimer_rearm+0x61/0x110 kernel/time/posix-timers.c:248
 posixtimer_rearm+0x135/0x340 kernel/time/posix-timers.c:268
 dequeue_signal+0x1ba/0x4b0 kernel/signal.c:706
 get_signal+0x551/0x1400 kernel/signal.c:2782
 arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4cb1d8ebe9
Code: 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 01 48
RSP: 002b:00007f4cb2bb20e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007f4cb1fb5fa8 RCX: 00007f4cb1d8ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4cb1fb5fa8
RBP: 00007f4cb1fb5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4cb1fb6038 R14: 00007fffcf104000 R15: 00007fffcf1040e8
 </TASK>
sched: RT throttling activated