syzbot


INFO: rcu detected stall in neigh_timer_handler (5)

Status: auto-closed as invalid on 2020/11/26 10:25
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 720d, last: 720d
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 617d 617d 0/23 auto-closed as invalid on 2021/03/09 03:20
upstream INFO: rcu detected stall in neigh_timer_handler 1 1363d 1363d 0/23 auto-closed as invalid on 2019/05/23 06:47
upstream INFO: rcu detected stall in neigh_timer_handler (2) 2 1072d 1074d 14/23 fixed on 2019/10/09 10:54
upstream INFO: rcu detected stall in neigh_timer_handler (4) 1 988d 988d 0/23 closed as invalid on 2019/12/04 14:04
upstream INFO: rcu detected stall in neigh_timer_handler (3) 2 993d 993d 0/23 closed as invalid on 2019/11/29 14:24
upstream INFO: rcu detected stall in neigh_timer_handler (7) 1 492d 492d 0/23 auto-closed as invalid on 2021/07/11 19:14
linux-4.14 INFO: rcu detected stall in neigh_timer_handler 5 838d 957d 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: 	1-....: (1 GPs behind) idle=e56/1/0x4000000000000000 softirq=25762/25764 fqs=4762 
	(t=10502 jiffies g=38777 q=1688)
NMI backtrace for cpu 1
CPU: 1 PID: 17813 Comm: syz-executor.1 Not tainted 5.9.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:318
 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 rcu_pending kernel/rcu/tree.c:3637 [inline]
 rcu_sched_clock_irq.cold+0x5b3/0xccd kernel/rcu/tree.c:2519
 update_process_times+0x25/0xa0 kernel/time/timer.c:1710
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 sysvec_apic_timer_interrupt+0x4c/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:__list_add_valid+0x74/0xa0 lib/list_debug.c:35
Code: 00 75 3a 48 8b 16 4c 39 e2 0f 85 5e 01 00 00 48 39 f5 0f 84 3e 01 00 00 4c 39 e5 0f 84 35 01 00 00 48 83 c4 08 b8 01 00 00 00 <5d> 41 5c c3 48 89 34 24 e8 9f 4a 15 fe 48 8b 34 24 eb a1 48 89 f7
RSP: 0018:ffffc90000da8300 EFLAGS: 00000296
RAX: 0000000000000001 RBX: ffff88804644c9e8 RCX: ffffffff866a7350
RDX: ffff88804644c9e8 RSI: ffff88804644c9e8 RDI: ffff88804644c9f0
RBP: ffff888046436db0 R08: 0000000000000000 R09: ffffffff8ab2684f
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804644c9e8
R13: ffff888046436db0 R14: dffffc0000000000 R15: ffff8880464331a0
 __list_add include/linux/list.h:67 [inline]
 list_add_tail include/linux/list.h:100 [inline]
 list_move_tail include/linux/list.h:228 [inline]
 cake_dequeue+0x12b1/0x3c10 net/sched/sch_cake.c:2096
 dequeue_skb net/sched/sch_generic.c:263 [inline]
 qdisc_restart net/sched/sch_generic.c:366 [inline]
 __qdisc_run+0x1ac/0x1620 net/sched/sch_generic.c:384
 __dev_xmit_skb net/core/dev.c:3800 [inline]
 __dev_queue_xmit+0x1995/0x2d60 net/core/dev.c:4105
 neigh_hh_output include/net/neighbour.h:498 [inline]
 neigh_output include/net/neighbour.h:507 [inline]
 ip_finish_output2+0x1523/0x21f0 net/ipv4/ip_output.c:228
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x779/0xcb0 net/ipv4/ip_output.c:288
 ip_finish_output+0x34/0x1f0 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip_output+0x196/0x310 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:443 [inline]
 ip_local_out net/ipv4/ip_output.c:125 [inline]
 ip_send_skb net/ipv4/ip_output.c:1566 [inline]
 ip_push_pending_frames+0x125/0x2b0 net/ipv4/ip_output.c:1586
 icmp_push_reply+0x342/0x490 net/ipv4/icmp.c:390
 __icmp_send+0xb67/0x13e0 net/ipv4/icmp.c:740
 ipv4_send_dest_unreach net/ipv4/route.c:1227 [inline]
 ipv4_link_failure+0x5f0/0x9f0 net/ipv4/route.c:1234
 dst_link_failure include/net/dst.h:426 [inline]
 arp_error_report+0xc7/0x1c0 net/ipv4/arp.c:293
 neigh_invalidate+0x20d/0x560 net/core/neighbour.c:993
 neigh_timer_handler+0xda0/0x1150 net/core/neighbour.c:1080
 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413
 expire_timers kernel/time/timer.c:1458 [inline]
 __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755
 __run_timers kernel/time/timer.c:1736 [inline]
 run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
 __do_softirq+0x2de/0xa24 kernel/softirq.c:298
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x4/0x20 kernel/kcov.c:284
Code: 84 00 00 00 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 cc fe ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 <89> f2 89 fe bf 05 00 00 00 e9 ae fe ff ff 0f 1f 40 00 66 2e 0f 1f
RSP: 0018:ffffc9001573f9e0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: ffffc9001573fa98 RCX: ffffffff81a3bda5
RDX: 1ffff92002ae7f5b RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffea0001ec1940 R08: 0000000000000001 R09: ffffea0001ec1947
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000200
R13: ffffc9001573fad8 R14: 0000000000000200 R15: 000000000000010f
 __do_fault+0x165/0x4d0 mm/memory.c:3476
 do_read_fault mm/memory.c:3856 [inline]
 do_fault mm/memory.c:3984 [inline]
 handle_pte_fault mm/memory.c:4224 [inline]
 __handle_mm_fault mm/memory.c:4359 [inline]
 handle_mm_fault+0x3477/0x4590 mm/memory.c:4457
 faultin_page mm/gup.c:887 [inline]
 __get_user_pages+0x724/0x16b0 mm/gup.c:1105
 populate_vma_page_range+0x24d/0x330 mm/gup.c:1435
 __mm_populate+0x1ea/0x350 mm/gup.c:1483
 mm_populate include/linux/mm.h:2559 [inline]
 vm_mmap_pgoff+0x1de/0x200 mm/util.c:511
 ksys_mmap_pgoff+0xde/0x560 mm/mmap.c:1596
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8daf0b9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000020bc0 RCX: 000000000045d5b9
RDX: 0000000000000003 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 000000000118d038 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 000000000118cfec
R13: 00007fff1416a50f R14: 00007f8daf0ba9c0 R15: 000000000118cfec

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-net-kasan-gce 2020/08/28 10:25 net-next 50aba46c234e 816e0689 .config log report