rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=8401, q=44 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294955502-4294945000), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g8401 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:26032 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x14e2/0x4580 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 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:
CPU: 1 PID: 5814 Comm: syz-executor731 Not tainted 6.6.96-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:228 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:240 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:504 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:1082 [inline]
RIP: 0010:trace_rseq_update include/trace/events/rseq.h:11 [inline]
RIP: 0010:rseq_update_cpu_node_id kernel/rseq.c:108 [inline]
RIP: 0010:__rseq_handle_notify_resume+0x2dd/0x1160 kernel/rseq.c:333
Code: 09 00 00 e8 95 db d1 ff 41 89 de c1 eb 06 48 8d 3c dd a8 7f 4a 8e be 08 00 00 00 e8 1d 8c 2a 00 31 f6 4c 0f a3 35 bb c4 96 0c <0f> 92 c3 40 0f 92 c6 bf 02 00 00 00 e8 f2 dd d1 ff 84 db 0f 84 ae
RSP: 0018:ffffc90003bd7c80 EFLAGS: 00000247
RAX: ffffffff81b3ba01 RBX: 0000000000000000 RCX: ffffffff81b3bae3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e4a7fa8
RBP: ffffc90003bd7d90 R08: ffffffff8e4a7faf R09: 1ffffffff1c94ff5
R10: dffffc0000000000 R11: fffffbfff1c94ff6 R12: 1ffff9200077af9c
R13: 0000000000000000 R14: 0000000000000001 R15: dffffc0000000000
FS:  000055556a02b3c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe23f6e7d60 CR3: 000000003134a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rseq_handle_notify_resume include/linux/sched.h:2360 [inline]
 rseq_signal_deliver include/linux/sched.h:2369 [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+0x375/0x780 arch/x86/kernel/signal.c:312
 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: 0033:0x7fe23f6d0229
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 1d 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdad409768 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fe23f6d0229
RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007fe23f687990 R09: 00007fe23f687990
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe23f726e3c
R13: 00007fe23f72014e R14: 00007ffdad4097a0 R15: 0000000000000000
 </TASK>