syzbot


INFO: rcu detected stall in neigh_timer_handler (3)

Status: closed as invalid on 2019/11/29 14:24
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 990d, last: 990d
similar bugs (7):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in neigh_timer_handler (6) 1 614d 614d 0/23 auto-closed as invalid on 2021/03/09 03:20
upstream INFO: rcu detected stall in neigh_timer_handler 1 1360d 1360d 0/23 auto-closed as invalid on 2019/05/23 06:47
upstream INFO: rcu detected stall in neigh_timer_handler (2) 2 1070d 1071d 14/23 fixed on 2019/10/09 10:54
upstream INFO: rcu detected stall in neigh_timer_handler (4) 1 985d 985d 0/23 closed as invalid on 2019/12/04 14:04
upstream INFO: rcu detected stall in neigh_timer_handler (5) 1 717d 717d 0/23 auto-closed as invalid on 2020/11/26 10:25
upstream INFO: rcu detected stall in neigh_timer_handler (7) 1 490d 490d 0/23 auto-closed as invalid on 2021/07/11 19:14
linux-4.14 INFO: rcu detected stall in neigh_timer_handler 5 835d 954d 0/1 auto-closed as invalid on 2020/08/30 16:21

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=612/1/0x4000000000000004 softirq=13631/13632 fqs=5027 
	(t=10502 jiffies g=11577 q=1436)
NMI backtrace for cpu 0
CPU: 0 PID: 13003 Comm: syz-executor.3 Not tainted 5.4.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq.cold+0x509/0xc02 kernel/rcu/tree.c:2271
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:95
Code: 25 a4 27 5e 09 41 bc f4 ff ff ff e8 9d 52 e9 ff 48 c7 05 8e 27 5e 09 00 00 00 00 e9 f2 e5 ff ff cc cc cc cc cc cc cc cc cc 55 <48> 89 e5 65 48 8b 04 25 c0 1e 02 00 65 8b 15 54 40 8d 7e 81 e2 00
RSP: 0018:ffff88802d2096d0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000302 RBX: 0000000000000000 RCX: ffffffff87721075
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff88802d2096f8 R08: ffff888011c6c340 R09: ffffed1005a47045
R10: ffffed1005a47044 R11: ffff88802d238223 R12: ffff888072d20000
R13: 0000000000000000 R14: 0000000000000004 R15: ffff88802910da00
 l3mdev_fib_table include/net/l3mdev.h:118 [inline]
 inet_addr_type_dev_table+0x87/0x1b0 net/ipv4/fib_frontend.c:264
 icmp_route_lookup.constprop.0+0x746/0x15c0 net/ipv4/icmp.c:506
 __icmp_send+0xaef/0x14a0 net/ipv4/icmp.c:718
 ipv4_send_dest_unreach net/ipv4/route.c:1220 [inline]
 ipv4_link_failure+0x549/0x920 net/ipv4/route.c:1227
 dst_link_failure include/net/dst.h:419 [inline]
 arp_error_report+0xce/0x1c0 net/ipv4/arp.c:293
 neigh_invalidate+0x245/0x570 net/core/neighbour.c:996
 neigh_timer_handler+0xd44/0x10e0 net/core/neighbour.c:1082
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline]
RIP: 0010:generic_exec_single+0x33a/0x4c0 kernel/smp.c:155
Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 68 01 00 00 48 83 3d 2e 81 a9 07 00 0f 84 e0 00 00 00 e8 eb 2a 0b 00 48 89 df 57 9d <0f> 1f 44 00 00 45 31 ed e9 39 fe ff ff e8 d4 2a 0b 00 0f 0b e9 23
RSP: 0018:ffff88806cb77a80 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: 0000000000000212 RCX: ffffc9000d043000
RDX: 000000000000169b RSI: ffffffff8169b335 RDI: 0000000000000212
RBP: ffff88806cb77ab0 R08: 1ffffffff15377ba R09: fffffbfff15377bb
R10: fffffbfff15377ba R11: ffffffff8a9bbdd7 R12: 0000000000000200
R13: ffff88806cb77b00 R14: ffff88806cb77bd0 R15: ffffffff818bd170
 smp_call_function_single+0x17c/0x480 kernel/smp.c:308
 task_function_call+0xe9/0x180 kernel/events/core.c:114
 perf_install_in_context+0x308/0x5a0 kernel/events/core.c:2746
 __do_sys_perf_event_open+0x1cbc/0x2c70 kernel/events/core.c:11543
 __se_sys_perf_event_open kernel/events/core.c:11151 [inline]
 __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:11151
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a759
Code: bd b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff6cdf55c88 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 000000000071bf00 RCX: 000000000045a759
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000240
RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007ff6cdf566d4
R13: 00000000004aec17 R14: 00000000006f1cb0 R15: 00000000ffffffff

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-qemu-upstream 2019/11/29 12:47 upstream 81b6b96475ac d29b9e84 .config log report
ci-qemu-upstream 2019/11/29 12:26 upstream 81b6b96475ac d29b9e84 .config log report