rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10499 ticks this GP) idle=05cc/1/0x4000000000000000 softirq=55727/55727 fqs=16
rcu: (t=10502 jiffies g=87889 q=52 ncpus=2)
rcu: rcu_preempt kthread starved for 10471 jiffies! g87889 f0x0 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:26600 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 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
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: 13720 Comm: syz.1.2384 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:unwind_next_frame+0x1602/0x2990 arch/x86/kernel/unwind_orc.c:590
Code: 00 49 89 c6 48 8b 44 24 48 42 80 3c 38 00 48 8b 5c 24 28 74 08 48 89 df e8 9b 20 a4 00 4c 89 33 48 8b 44 24 68 42 80 3c 38 00 <48> 8b 5c 24 60 74 08 48 89 df e8 7f 20 a4 00 48 8b 44 24 08 48 89
RSP: 0018:ffffc900000067f0 EFLAGS: 00000046
RAX: 1ffff92000000d2b RBX: ffffc90000006968 RCX: ffff88807dc40000
RDX: 0000000000000100 RSI: 0000000000000002 RDI: ffffc90000007230
RBP: ffffc90000006970 R08: ffff88807dc40000 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc90000007230
R13: ffffc90000006920 R14: ffffffff8aa0144a R15: dffffc0000000000
FS: 00007f5198f806c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5198f4da08 CR3: 000000007a5c4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
perf_callchain_kernel+0x42e/0x690 arch/x86/events/core.c:2780
get_perf_callchain+0x231/0x510 kernel/events/callchain.c:204
perf_callchain kernel/events/core.c:7734 [inline]
perf_sample_save_callchain include/linux/perf_event.h:1232 [inline]
perf_prepare_sample+0x3c7/0x1db0 kernel/events/core.c:7778
__perf_event_output kernel/events/core.c:7966 [inline]
perf_event_output_forward+0x187/0x3e0 kernel/events/core.c:7987
__perf_event_overflow+0x461/0x660 kernel/events/core.c:9712
perf_swevent_overflow kernel/events/core.c:9795 [inline]
perf_swevent_event+0x319/0x570 kernel/events/core.c:9846
perf_tp_event+0x620/0x1550 kernel/events/core.c:10373
perf_trace_run_bpf_submit+0xf4/0x1c0 kernel/events/core.c:10292
perf_trace_preemptirq_template+0x269/0x330 include/trace/events/preemptirq.h:14
trace_irq_enable+0xbb/0xe0 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 4b e4 ce f6 65 8b 05 1c 33 76 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc900000072e0 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: ece554029770c600
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: 0000000000000001
RBP: ffffc90000007370 R08: ffffffff911bc5ff R09: 1ffffffff22378bf
R10: dffffc0000000000 R11: fffffbfff22378c0 R12: dffffc0000000000
R13: ffff8880611bbb60 R14: ffffffff97594038 R15: 1ffff92000000e5c
debug_object_activate+0x307/0x500 lib/debugobjects.c:727
debug_rcu_head_queue kernel/rcu/rcu.h:227 [inline]
__call_rcu_common kernel/rcu/tree.c:2706 [inline]
call_rcu+0xa6/0x900 kernel/rcu/tree.c:2837
refdst_drop include/net/dst.h:270 [inline]
skb_dst_drop include/net/dst.h:282 [inline]
__dev_queue_xmit+0x801/0x3630 net/core/dev.c:4405
neigh_output include/net/neighbour.h:543 [inline]
ip6_finish_output2+0xe2e/0x1620 net/ipv6/ip6_output.c:141
dst_output include/net/dst.h:467 [inline]
NF_HOOK include/linux/netfilter.h:304 [inline]
ndisc_send_skb+0xbb9/0x1480 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x36b/0x640 net/ipv6/addrconf.c:4029
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x570/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:generic_exec_single+0x477/0x4e0 kernel/smp.c:418
Code: 75 11 e8 2c 00 0b 00 48 85 db 75 16 e8 22 00 0b 00 eb 15 e8 1b 00 0b 00 e8 06 f3 07 09 48 85 db 74 ea e8 0c 00 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 43 c7 44 2c 08
RSP: 0018:ffffc9000447fa00 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffff88807dc40000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000447fad0 R08: ffffffff911bc5ff R09: 1ffffffff22378bf
R10: dffffc0000000000 R11: fffffbfff22378c0 R12: 1ffff9200088ff44
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff9200088ff65
smp_call_function_single+0x36d/0x5a0 kernel/smp.c:647
task_function_call kernel/events/core.c:120 [inline]
perf_install_in_context+0x5bb/0x920 kernel/events/core.c:2951
__do_sys_perf_event_open kernel/events/core.c:12949 [inline]
__se_sys_perf_event_open+0x1841/0x1c60 kernel/events/core.c:12601
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f519819ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5198f80028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f5198416090 RCX: 00007f519819ce59
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007f5198232e6f R08: 0000000000000002 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5198416128 R14: 00007f5198416090 R15: 00007ffff774cf78
CPU: 1 PID: 13719 Comm: syz.1.2384 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 4b e4 ce f6 65 8b 05 1c 33 76 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc900001f0880 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 07c4dcc5f4a4f900
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: 0000000000000001
RBP: ffffc900001f0918 R08: ffffffff911bc607 R09: 1ffffffff22378c0
R10: dffffc0000000000 R11: fffffbfff22378c1 R12: dffffc0000000000
R13: ffff88801bb648c0 R14: ffffffff97598058 R15: 1ffff9200003e110
FS: 00007f5198fa16c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007a5c4000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
debug_object_assert_init+0x1f1/0x2f0 lib/debugobjects.c:900
debug_timer_assert_init kernel/time/timer.c:792 [inline]
debug_assert_init kernel/time/timer.c:837 [inline]
__timer_delete+0x3f/0x290 kernel/time/timer.c:1321
del_timer include/linux/timer.h:213 [inline]
inet_frag_kill+0x8b/0x10d0 net/ipv4/inet_fragment.c:266
ipq_kill net/ipv4/ip_fragment.c:123 [inline]
ip_expire+0x19f/0x770 net/ipv4/ip_fragment.c:157
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x570/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:generic_exec_single+0x477/0x4e0 kernel/smp.c:418
Code: 75 11 e8 2c 00 0b 00 48 85 db 75 16 e8 22 00 0b 00 eb 15 e8 1b 00 0b 00 e8 06 f3 07 09 48 85 db 74 ea e8 0c 00 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 43 c7 44 2c 08
RSP: 0018:ffffc900043ffa00 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffff88807dc43c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900043ffad0 R08: ffffffff911bc5ff R09: 1ffffffff22378bf
R10: dffffc0000000000 R11: fffffbfff22378c0 R12: 1ffff9200087ff44
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff9200087ff65
smp_call_function_single+0x36d/0x5a0 kernel/smp.c:647
task_function_call kernel/events/core.c:120 [inline]
perf_install_in_context+0x5bb/0x920 kernel/events/core.c:2951
__do_sys_perf_event_open kernel/events/core.c:12949 [inline]
__se_sys_perf_event_open+0x1841/0x1c60 kernel/events/core.c:12601
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f519819ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5198fa1028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f5198415fa0 RCX: 00007f519819ce59
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007f5198232e6f R08: 0000000000000002 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5198416038 R14: 00007f5198415fa0 R15: 00007ffff774cf78