rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=7477, q=518 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294956995-4294946492), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g7477 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:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_timer_base kernel/time/timer.c:1000 [inline]
RIP: 0010:__try_to_del_timer_sync+0x50/0x3a0 kernel/time/timer.c:1459
Code: 52 2d 03 48 89 1c 24 48 83 c3 20 49 89 dc 49 c1 ec 03 eb 07 e8 31 9a 12 00 f3 90 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 <84> c0 0f 85 e6 00 00 00 44 8b 2b 44 89 ee 81 e6 00 00 04 00 31 ff
RSP: 0018:ffffc90000157918 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffffc90000157a80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8c04e5e0 RDI: 00000000ffffffff
RBP: ffffc90000157a30 R08: ffffffff8fe52d37 R09: 1ffffffff1fca5a6
R10: dffffc0000000000 R11: fffffbfff1fca5a7 R12: 1ffff9200002af50
R13: 1ffff9200002af30 R14: 0000000000000000 R15: 0000000000000000
 __timer_delete_sync+0x1fe/0x2d0 kernel/time/timer.c:1620
 schedule_timeout+0x133/0x270 kernel/time/sleep_timeout.c:100
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 UID: 0 PID: 6159 Comm: syz.0.33 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:arch_clear_bit include/linux/instrumented.h:82 [inline]
RIP: 0010:clear_bit include/asm-generic/bitops/instrumented-atomic.h:42 [inline]
RIP: 0010:clear_ti_thread_flag include/linux/thread_info.h:102 [inline]
RIP: 0010:fpregs_mark_activate arch/x86/kernel/fpu/core.c:901 [inline]
RIP: 0010:fpu__clear_user_states+0x216/0x350 arch/x86/kernel/fpu/core.c:838
Code: 0a 4c 89 f9 48 c1 e9 03 42 0f b6 0c 31 84 c9 0f 85 a0 00 00 00 41 89 07 48 89 df be 08 00 00 00 e8 9f e6 ba 00 f0 80 63 01 bf <48> 8b 3c 24 be 00 02 00 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000258fd40 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88802c1e1e00 RCX: ffffffff816994a1
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88802c1e1e00
RBP: 0000000000000000 R08: ffff88802c1e1e07 R09: 1ffff1100583c3c0
R10: dffffc0000000000 R11: ffffed100583c3c1 R12: ffff88802c1e3740
R13: ffff88802c1e1e2c R14: dffffc0000000000 R15: ffff88802c1e3740
FS:  00007f7cb242d6c0(0000) GS:ffff8881258c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000007f4b8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 handle_signal arch/x86/kernel/signal.c:310 [inline]
 arch_do_signal_or_restart+0x452/0x750 arch/x86/kernel/signal.c:339
 exit_to_user_mode_loop+0x75/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7cb15b7320
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 4a 3e 08 00 e8 f5 8f f8 ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007f7cb242cb38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f7cb17c5fa8 RCX: 00007f7cb158ebe9
RDX: 00007f7cb242cb40 RSI: 00007f7cb242cc70 RDI: 0000000000000021
RBP: 00007f7cb17c5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7cb17c6038 R14: 00007fff0292c2a0 R15: 00007fff0292c388
 </TASK>