rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=9661, q=162 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10495 (4294964927-4294954432), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10496 jiffies! g9661 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:27752 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2168
 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5824 Comm: syz-executor166 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:mark_usage kernel/locking/lockdep.c:4558 [inline]
RIP: 0010:__lock_acquire+0xc75/0x7c80 kernel/locking/lockdep.c:5091
Code: f6 ba 01 00 00 00 e8 6a aa 00 00 49 b8 00 00 00 00 00 fc ff df 85 c0 0f 84 84 04 00 00 48 8b 84 24 c8 00 00 00 42 0f b6 04 00 <84> c0 0f 85 f0 60 00 00 48 8b 84 24 98 00 00 00 83 38 00 0f 84 8b
RSP: 0018:ffffc90004a4f860 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90d96530
RBP: ffffc90004a4faa8 R08: dffffc0000000000 R09: 1ffffffff21b2ca6
R10: dffffc0000000000 R11: fffffbfff21b2ca7 R12: 0000000000000000
R13: ffff888029130000 R14: ffff888029130ae0 R15: ffff888029130b00
FS:  000055555c7053c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 000000002e0fa000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 __might_fault+0xc6/0x120 mm/memory.c:5968
 rseq_get_rseq_cs_ptr_val kernel/rseq.c:161 [inline]
 rseq_get_rseq_cs kernel/rseq.c:183 [inline]
 rseq_ip_fixup kernel/rseq.c:303 [inline]
 __rseq_handle_notify_resume+0x12e/0x1170 kernel/rseq.c:351
 rseq_handle_notify_resume include/linux/sched.h:2364 [inline]
 rseq_signal_deliver include/linux/sched.h:2372 [inline]
 setup_rt_frame arch/x86/kernel/signal.c:212 [inline]
 handle_signal arch/x86/kernel/signal.c:267 [inline]
 arch_do_signal_or_restart+0x3bb/0x7b0 arch/x86/kernel/signal.c:312
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xf6/0x180 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:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f839afbf51a
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 23 87 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 83 87 02 00 8b 44 24
RSP: 002b:00007ffc41edb5e0 EFLAGS: 00000293
RAX: fffffffffffffff7 RBX: 0000000000000007 RCX: 00007f839afbf51a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f839b0181cc
R13: 00007ffc41edb900 R14: 00007ffc41edb630 R15: 0000000000000000
 </TASK>