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rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=425/1/0x4000000000000000 softirq=13781/13783 fqs=4644 (t=10500 jiffies g=19261 q=1261) NMI backtrace for cpu 0 CPU: 0 PID: 6457 Comm: syz.4.607 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+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:unwind_next_frame+0x8af/0x1d90 arch/x86/kernel/unwind_orc.c:-1 Code: 7a 01 48 89 d0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 fa 12 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 14 13 00 00 <48> 0f bf 02 48 01 c7 48 89 7c 24 08 4d 8d 7e 01 43 0f b6 04 2c 84 RSP: 0018:ffffc90000006d28 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc90000006de8 RCX: ffffffff8dc5d06c RDX: ffffffff8e586dcc RSI: ffffffff8e586d96 RDI: ffffc900000071b0 RBP: ffffc90000006e30 R08: 000000000000000a R09: 0000000000000002 R10: fffff52000000dc9 R11: 1ffff92000000dc7 R12: 1ffffffff1cb0dba R13: dffffc0000000000 R14: ffffffff8e586dd0 R15: ffffffff8e586dcd arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x22c/0x750 net/core/skbuff.c:427 alloc_skb include/linux/skbuff.h:1162 [inline] alloc_skb_with_frags+0xa7/0x730 net/core/skbuff.c:6170 sock_alloc_send_pskb+0x853/0x980 net/core/sock.c:2531 __ip_append_data+0x1f82/0x3230 net/ipv4/ip_output.c:1102 ip_append_data+0x132/0x1a0 net/ipv4/ip_output.c:1326 icmp_push_reply+0x100/0x420 net/ipv4/icmp.c:377 __icmp_send+0xc67/0x1010 net/ipv4/icmp.c:777 ipv4_send_dest_unreach net/ipv4/route.c:1265 [inline] ipv4_link_failure+0x5db/0x970 net/ipv4/route.c:1272 dst_link_failure include/net/dst.h:422 [inline] arp_error_report+0x10e/0x150 net/ipv4/arp.c:295 neigh_invalidate+0x22c/0x440 net/core/neighbour.c:1001 neigh_timer_handler+0x910/0xfe0 net/core/neighbour.c:1088 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x525/0x7c0 kernel/time/timer.c:1767 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780 handle_softirqs+0x328/0x820 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 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:ffffc9000344ff08 EFLAGS: 00000286 RAX: ffff88801fc40000 RBX: 00000000000000ca RCX: 0684d27b1ae7f000 RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: ffffffff8a59a480 RBP: ffffc9000344ff48 R08: dffffc0000000000 R09: ffffed1017207662 R10: ffffed1017207662 R11: 1ffff11017207661 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc9000344ff58 R15: 0000000000000000 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fe34bb81ba9 Code: 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 01 48 RSP: 002b:00007fe349de90e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fe34bdc8fa8 RCX: 00007fe34bb81ba9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fe34bdc8fac RBP: 00007fe34bdc8fa0 R08: 0025d1c890a8a24a R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe34bdc9038 R14: 00007fff0d700060 R15: 00007fff0d700148 </TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/09/14 11:36 | linux-5.15.y | 43bb85222e53 | e2beed91 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-perf | INFO: rcu detected stall in neigh_timer_handler |