rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=10981, q=180 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294960542-4294950040), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g10981 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:27464 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4559 Comm: syz.1.36 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1b/0x60 kernel/kcov.c:216
Code: 89 de 5b e9 37 58 4f 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d a4 9e 81 7e 65 8b 15 a5 9e 81 7e 81 e2 00 01 ff 00 74 11 <81> fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 74 2c 8b 91 f8 15 00
RSP: 0018:ffffc900001e0d18 EFLAGS: 00000006
RAX: ffffffff8170f6ca RBX: ffff8880b8f2a6c8 RCX: ffff888027531dc0
RDX: 0000000000010000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffffc900001e0e88 R08: dffffc0000000000 R09: ffffed10171e54b1
R10: ffffed10171e54b1 R11: 1ffff110171e54b0 R12: ffff888029b84980
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000002
FS:  00007f3644cd66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000057827000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 cpu_max_bits_warn include/linux/cpumask.h:110 [inline]
 cpumask_check include/linux/cpumask.h:117 [inline]
 cpumask_test_cpu include/linux/cpumask.h:444 [inline]
 cpu_online include/linux/cpumask.h:1030 [inline]
 trace_hrtimer_expire_entry include/trace/events/timer.h:239 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1749 [inline]
 __hrtimer_run_queues+0x48a/0xd60 kernel/time/hrtimer.c:1816
 hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1878
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:rseq_signal_deliver include/linux/sched.h:2336 [inline]
RIP: 0010:setup_rt_frame arch/x86/kernel/signal.c:773 [inline]
RIP: 0010:handle_signal arch/x86/kernel/signal.c:828 [inline]
RIP: 0010:arch_do_signal_or_restart+0x1f6/0x1230 arch/x86/kernel/signal.c:873
Code: 89 44 24 18 bf 01 00 00 00 e8 c6 16 2b 00 49 8d bc 24 78 15 00 00 be 08 00 00 00 e8 74 55 a4 00 49 0f ba ac 24 78 15 00 00 01 <bf> 01 00 00 00 e8 30 18 2b 00 65 8b 05 31 d1 d5 7e 85 c0 0f 84 48
RSP: 0018:ffffc90003687cc0 EFLAGS: 00000257
RAX: 1ffff11004ea6601 RBX: dffffc0000000000 RCX: ffffffff812c9dfc
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888027533338
RBP: ffffc90003687ec0 R08: dffffc0000000000 R09: ffffed1004ea6668
R10: ffffed1004ea6668 R11: 1ffff11004ea6667 R12: ffff888027531dc0
R13: ffff888027532330 R14: ffffffffffffffff R15: 0000000000000021
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3643d8eba7
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:00007f3644cd60e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f3643fd5fa8 RCX: 00007f3643d8eba9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3643fd5fa8
RBP: 00007f3643fd5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3643fd6038 R14: 00007fffc8c489f0 R15: 00007fffc8c48ad8
 </TASK>
sched: RT throttling activated