rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10496 ticks this GP) idle=375/1/0x4000000000000000 softirq=12989/12989 fqs=5 
	(t=10502 jiffies g=16253 q=1034)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10474 jiffies! g16253 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=9469
rcu: rcu_preempt kthread starved for 10477 jiffies! g16253 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27656 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </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: 6239 Comm: syz.0.342 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:native_x2apic_wait_icr_idle+0x0/0x10 arch/x86/include/asm/apic.h:230
Code: 00 89 f9 0f 32 66 90 5b c3 48 c1 e2 20 48 09 c2 48 89 d6 31 d2 48 89 c3 e8 5d b8 c7 02 48 89 d8 5b c3 0f 1f 84 00 00 00 00 00 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 31 c0 c3 66 2e 0f
RSP: 0018:ffffc900043d79c8 EFLAGS: 00000046
RAX: 1ffffffff177853d RBX: ffff8880b9033b48 RCX: ffffffff8bbc29e8
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed10172067af
R10: ffffed10172067af R11: 1ffff110172067ae R12: ffff8880b9033b01
R13: dffffc0000000000 R14: ffff8880b9033b50 R15: 0000000000000020
FS:  0000555587392500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd140da1000 CR3: 0000000022c1a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 irq_work_queue+0x95/0x140 kernel/irq_work.c:75
 bpf_send_signal_common+0x2b2/0x420 kernel/trace/bpf_trace.c:820
 ____bpf_send_signal_thread kernel/trace/bpf_trace.c:841 [inline]
 bpf_send_signal_thread+0x12/0x20 kernel/trace/bpf_trace.c:839
 bpf_prog_5197b192823fa451+0x1a/0xb0
 bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline]
 bpf_trace_run3+0x17e/0x320 kernel/trace/bpf_trace.c:1916
 trace_signal_deliver+0x14c/0x1a0 include/trace/events/signal.h:96
 get_signal+0x766/0x12c0 kernel/signal.c:2796
 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd142e5d920
Code: 48 c1 e8 12 83 e0 01 88 15 d2 5d eb 00 88 05 cf 5d eb 00 c3 50 48 8d 35 01 25 1c 00 48 8d 3d 07 25 1c 00 31 c0 e8 20 f7 ff ff <53> 89 fb 48 83 ec 10 64 8b 04 25 94 ff ff ff 85 c0 74 2a 89 fe 31
RSP: 002b:00007fff9a6a4638 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fd1431e4308 RCX: 00007fd142f541c7
RDX: 00007fff9a6a4640 RSI: 00007fff9a6a4770 RDI: 0000000000000007
RBP: 0000000000000003 R08: 00007fd1431e3fa0 R09: 00007fff9a6a4a97
R10: 0000000000000008 R11: 0000000000000246 R12: 00007fd1431e427c
R13: 00007fd1431e4270 R14: 0000000000001c5b R15: 0000000000000003
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 6247 Comm: syz.0.342 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22f/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31d/0x5f0 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x6d8/0x1110 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1690 [inline]
 __hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1754
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1816
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:93 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2a/0x70 kernel/entry/common.c:114
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 3d f6 ff ff eb 31 eb 35 e8 c4 f1 d4 f7 e8 bf ef d4 f7 fb 65 48 8b 05 26 76 59 76 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 51 32 bd f7 48
RSP: 0018:ffffc9000320ff08 EFLAGS: 00000286
RAX: ffff88807d24bb80 RBX: 000000000000000f RCX: ef9865df345fef00
RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: ffffffff8a59a480
RBP: ffffc9000320ff48 R08: dffffc0000000000 R09: fffffbfff1ad323e
R10: fffffbfff1ad323e R11: 1ffffffff1ad323d R12: 0000000000000000
R13: 0000000000000000 R14: ffffc9000320ff58 R15: 0000000000000000
 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd142f38da9
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007fd1411c0c80 EFLAGS: 00000202 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007fd1411c1d30 RCX: 00007fd142f38da9
RDX: 00007fd1411c0c80 RSI: 00007fd1411c0db0 RDI: 0000000000000021
RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000202 R12: 0000000000000073
R13: 00007fd1411c1eb0 R14: 9999999999999999 R15: 0000000000000000
 </TASK>