rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (1 GPs behind) idle=55b4/1/0x4000000000000000 softirq=93870/93873 fqs=4986
rcu: hardirqs softirqs csw/system
rcu: number: 1393684 0 0
rcu: cputime: 17206 35272 41 ==> 52500(ms)
rcu: (t=10502 jiffies g=138269 q=4587 ncpus=2)
CPU: 0 PID: 23064 Comm: syz.1.4534 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:preempt_count_sub+0x27/0x160 kernel/sched/core.c:5873
Code: 1f 40 00 f3 0f 1e fa 55 53 48 bb 00 00 00 00 00 fc ff df 48 c7 c0 80 84 2c 97 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 bd 00 00 00 <83> 3d b2 fd cf 15 00 75 25 65 8b 05 f1 2e a7 7e 89 c1 81 e1 ff ff
RSP: 0018:ffffc90000006ed8 EFLAGS: 00000297
RAX: 0000000000000004 RBX: dffffc0000000000 RCX: ffffffff972c8403
RDX: 0000000000000100 RSI: ffffc90000007028 RDI: 0000000000000001
RBP: ffffc90000007028 R08: ffff8880225fbc00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc90000007028
R13: dffffc0000000000 R14: ffffc900000070c0 R15: ffffc90000007038
FS: 00007f0c12d326c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555564a6da28 CR3: 0000000049559000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
unwind_next_frame+0x1d07/0x2970 arch/x86/kernel/unwind_orc.c:672
__unwind_start+0x66a/0x7e0 arch/x86/kernel/unwind_orc.c:760
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xf8/0x190 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x11a/0x2d0 mm/slub.c:3519
dst_alloc+0x105/0x170 net/core/dst.c:89
ip6_dst_alloc net/ipv6/route.c:344 [inline]
ip6_rt_pcpu_alloc net/ipv6/route.c:1419 [inline]
rt6_make_pcpu_route net/ipv6/route.c:1468 [inline]
ip6_pol_route+0x93d/0x1210 net/ipv6/route.c:2303
pol_lookup_func include/net/ip6_fib.h:622 [inline]
fib6_rule_lookup+0x20c/0x570 net/ipv6/fib6_rules.c:116
ip6_route_output_flags_noref net/ipv6/route.c:2675 [inline]
ip6_route_output_flags+0x364/0x5d0 net/ipv6/route.c:2687
ip6_route_output include/net/ip6_route.h:94 [inline]
icmpv6_rt_has_prefsrc+0x4f/0x3d0 net/ipv6/icmp.c:246
icmp6_send+0xe91/0x1b40 net/ipv6/icmp.c:565
__icmpv6_send include/linux/icmpv6.h:28 [inline]
icmpv6_send include/linux/icmpv6.h:49 [inline]
ip6_link_failure+0x3b/0x4c0 net/ipv6/route.c:2835
dst_link_failure include/net/dst.h:437 [inline]
ndisc_error_report+0x112/0x160 net/ipv6/ndisc.c:733
neigh_invalidate+0x22c/0x450 net/core/neighbour.c:1064
neigh_timer_handler+0x914/0xff0 net/core/neighbour.c:1151
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x542/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x280/0x820 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:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5255
Code: 0f 84 33 01 00 00 48 85 db 0f 85 52 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 00 54 31 09 e8 9b 23 30 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc9000cea7758 EFLAGS: 00000282
RAX: e0f6d6e66b836900 RBX: 0000000000000000 RCX: e0f6d6e66b836900
RDX: dffffc0000000000 RSI: ffffffff8acac960 RDI: ffffffff8b1c85a0
RBP: ffffc9000cea77b0 R08: ffffffff911c15ff R09: 1ffffffff22382bf
R10: dffffc0000000000 R11: fffffbfff22382c0 R12: ffff8880225fbc00
R13: dffffc0000000000 R14: ffff88802eb5da00 R15: ffff8880b8e3cac8
context_switch kernel/sched/core.c:5384 [inline]
__schedule+0x155b/0x45a0 kernel/sched/core.c:6700
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
smp_call_function_single+0x48d/0x5a0 kernel/smp.c:652
task_function_call kernel/events/core.c:120 [inline]
perf_install_in_context+0x5be/0x920 kernel/events/core.c:2948
__do_sys_perf_event_open kernel/events/core.c:12915 [inline]
__se_sys_perf_event_open+0x1836/0x1c50 kernel/events/core.c:12567
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0c11d9c799
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:00007f0c12d32028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f0c12015fa0 RCX: 00007f0c11d9c799
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007f0c11e32bd9 R08: 0000000000000002 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0c12016038 R14: 00007f0c12015fa0 R15: 00007ffc3b48f1d8