hrtimer: interrupt took 49462 ns
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (1 GPs behind) idle=964c/1/0x4000000000000000 softirq=11496/11497 fqs=2
rcu: (t=10501 jiffies g=10069 q=181 ncpus=2)
rcu: rcu_preempt kthread starved for 10498 jiffies! g10069 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:26504 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
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: 5938 Comm: syz.2.19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x2e/0x90 kernel/kcov.c:287
Code: 48 8b 04 24 65 48 8b 15 e0 41 7c 7e 65 8b 0d e1 41 7c 7e 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 1c 16 00 00 00 <74> 52 8b 8a f8 15 00 00 83 f9 03 75 47 48 8b 8a 00 16 00 00 44 8b
RSP: 0000:ffffc900034b67e8 EFLAGS: 00000046
RAX: ffffffff813ba5e6 RBX: ffffffff81000000 RCX: 0000000000000100
RDX: ffff88802c291e00 RSI: 00000000000052d7 RDI: 000000000009c000
RBP: 000000000009c000 R08: ffff88802c291e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900034b7f38
R13: 000000000009c001 R14: 00000000000052d7 R15: 0000000000000001
FS: 000055555a068500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000089 CR3: 000000007e05b000 CR4: 00000000003506f0
Call Trace:
orc_find arch/x86/kernel/unwind_orc.c:211 [inline]
unwind_next_frame+0x216/0x2990 arch/x86/kernel/unwind_orc.c:494
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:_compound_head include/linux/page-flags.h:248 [inline]
RIP: 0010:virt_to_folio include/linux/mm.h:1291 [inline]
RIP: 0010:virt_to_slab mm/slab.h:218 [inline]
RIP: 0010:kasan_addr_to_slab+0x30/0xd0 mm/kasan/common.c:37
Code: 89 fb e8 e3 4a 5d ff 84 c0 74 47 48 89 df e8 97 49 5d ff 48 c1 e8 06 48 83 e0 c0 48 ba 00 00 00 00 00 ea ff ff 48 8b 4c 10 08 c1 01 75 70 48 01 d0 66 90 48 8b 48 08 f6 c1 01 75 70 66 90 48
RSP: 0000:ffffc900034b72f0 EFLAGS: 00000206
RAX: 0000000000948100 RBX: ffff888025204b90 RCX: ffff88802c5b4280
RDX: ffffea0000000000 RSI: ffffffff8acadd60 RDI: ffff888025204b90
RBP: ffffc900034b7450 R08: ffffffff8e8c7caf R09: 1ffffffff1d18f95
R10: dffffc0000000000 R11: fffffbfff1d18f96 R12: dffffc0000000000
R13: 1ffff92000696e74 R14: ffff888025204b90 R15: 0000000000000000
__kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:477
__call_rcu_common kernel/rcu/tree.c:2721 [inline]
call_rcu+0x153/0x900 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:4036
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+0x56/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0033:0x7f9d8439de99
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:00007fff53a8b208 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f9d8439de99
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9d84625fa8
RBP: 0000000000000089 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f9d84625fa0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9d84625fac R14: 00007f9d84625fa8 R15: 00007f9d84625fa0
CPU: 1 PID: 5937 Comm: syz.1.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:seqcount_lockdep_reader_access+0x19a/0x1d0 include/linux/seqlock.h:105
Code: 00 4d 85 e4 75 16 e8 95 cc 0f 00 eb 15 e8 8e cc 0f 00 e8 39 2d 15 09 4d 85 e4 74 ea e8 7f cc 0f 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 43 c7 44 3e 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc900001f0200 EFLAGS: 00000246
RAX: ffffffff8177a851 RBX: 0000000000000000 RCX: ffff88802d710000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001f02b8 R08: ffffffff911eb60f R09: 1ffffffff223d6c1
R10: dffffc0000000000 R11: fffffbfff223d6c2 R12: 0000000000000200
R13: 000001fb6dee09e6 R14: 1ffff9200003e040 R15: dffffc0000000000
FS: 0000555568bac500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000013cd CR3: 000000007a28f000 CR4: 00000000003506e0
Call Trace:
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get_with_offset+0x103/0x330 kernel/time/timekeeping.c:891
ktime_get_real include/linux/timekeeping.h:79 [inline]
netif_rx_internal+0x33d/0x4e0 net/core/dev.c:5153
__netif_rx+0x78/0xc0 net/core/dev.c:5196
veth_forward_skb drivers/net/veth.c:325 [inline]
veth_xmit+0x57a/0xa30 drivers/net/veth.c:378
__netdev_start_xmit include/linux/netdevice.h:4945 [inline]
netdev_start_xmit include/linux/netdevice.h:4959 [inline]
xmit_one net/core/dev.c:3644 [inline]
dev_hard_start_xmit+0x269/0x790 net/core/dev.c:3660
__dev_queue_xmit+0x198c/0x3630 net/core/dev.c:4454
dev_queue_xmit include/linux/netdevice.h:3115 [inline]
neigh_hh_output include/net/neighbour.h:527 [inline]
neigh_output include/net/neighbour.h:541 [inline]
ip6_finish_output2+0xdf7/0x1620 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:4036
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:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2e/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 e9 fa ff ff 66 90 66 90 e8 a0 06 01 f7 e8 5b 06 01 f7 fb 65 48 8b 05 12 dc 76 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 1d 46 e7 f6 48
RSP: 0018:ffffc90003497f08 EFLAGS: 00000286
RAX: ffff88802d710000 RBX: 00000000000000ca RCX: 03fcf1c306603e00
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1d0660
RBP: ffffc90003497f48 R08: ffffffff8e8c7caf R09: 1ffffffff1d18f95
R10: dffffc0000000000 R11: fffffbfff1d18f96 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90003497f58 R15: 0000000000000000
do_syscall_64+0x28/0xb0 arch/x86/entry/common.c:72
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efe61f9de99
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:00007ffd13e1b288 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efe61f9de99
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007efe62225fac
RBP: 00000000000013cd R08: 0000000000745aa0 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efe62225fac R14: 00007efe62225fa8 R15: 00007efe62225fa0