syzbot


INFO: rcu detected stall in addrconf_dad_work

Status: fixed on 2019/10/09 10:54
Reported-by: syzbot+0055e43d6f67fb9b8ba1@syzkaller.appspotmail.com
Fix commit: d4d6ec6dac07 sch_hhf: ensure quantum and hhf_non_hh_weight are non-zero
First crash: 1689d, last: 1680d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: no output from test machine (log)
Repro: C syz .config
  
Discussions (1)
Title Replies (including bot) Last reply
INFO: rcu detected stall in addrconf_dad_work 1 (2) 2019/09/10 19:20
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in addrconf_dad_work (5) net C done inconclusive 9 6d13h 1322d 0/26 upstream: reported C repro on 2020/09/07 15:59
upstream INFO: rcu detected stall in addrconf_dad_work (4) cgroups mm 8 1565d 1565d 0/26 closed as invalid on 2020/01/09 08:13
upstream INFO: rcu detected stall in addrconf_dad_work (3) kernel 6 1565d 1565d 0/26 closed as invalid on 2020/01/08 05:23
linux-4.14 INFO: rcu detected stall in addrconf_dad_work C done 18 1682d 1689d 1/1 fixed on 2019/12/06 10:33
upstream INFO: rcu detected stall in addrconf_dad_work (2) kernel 15 1600d 1602d 0/26 closed as invalid on 2019/12/04 14:14
linux-4.19 INFO: rcu detected stall in addrconf_dad_work (2) C done 1 1585d 1585d 1/1 fixed on 2020/01/19 15:05
linux-4.19 INFO: rcu detected stall in addrconf_dad_work C done 19 1676d 1688d 1/1 fixed on 2019/12/07 19:18

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=cf6/1/0x4000000000000002 softirq=8359/8359 fqs=3 
	(t=10500 jiffies g=8089 q=64)
rcu: rcu_preempt kthread starved for 10494 jiffies! g8089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29328    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xd9/0x260 kernel/sched/core.c:3947
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807
 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline]
 rcu_gp_kthread+0x9b2/0x18c0 kernel/rcu/tree.c:1768
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 0
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.3.0-rc8+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 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:2736 [inline]
 rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 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:830
 </IRQ>
RIP: 0010:__list_add_valid+0xb/0xa0 lib/list_debug.c:22
Code: 3f d8 1d fe e8 36 47 f9 03 e9 87 fe ff ff e8 fc 46 6e fe eb 9e 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 55 <48> 89 e5 41 55 49 89 fd 48 8d 7a 08 41 54 49 89 d4 48 89 fa 48 83
RSP: 0018:ffff8880a9886d48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff8880968cf4f8 RCX: ffffffff85c67051
RDX: ffff8880968cf590 RSI: ffff8880968cf590 RDI: ffff8880968cf4f8
RBP: ffff8880a9886da8 R08: ffff8880a9876140 R09: 0000000000000000
R10: fffffbfff134afaf R11: ffff8880a9876140 R12: dffffc0000000000
R13: ffff8880968cf200 R14: ffff8880968cf598 R15: ffff8880968cf590
 dequeue_skb net/sched/sch_generic.c:258 [inline]
 qdisc_restart net/sched/sch_generic.c:361 [inline]
 __qdisc_run+0x1e7/0x19d0 net/sched/sch_generic.c:379
 __dev_xmit_skb net/core/dev.c:3533 [inline]
 __dev_queue_xmit+0x16f1/0x3650 net/core/dev.c:3838
 dev_queue_xmit+0x18/0x20 net/core/dev.c:3902
 br_dev_queue_push_xmit+0x3f3/0x5c0 net/bridge/br_forward.c:52
 NF_HOOK include/linux/netfilter.h:305 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 br_forward_finish+0xfa/0x400 net/bridge/br_forward.c:65
 NF_HOOK include/linux/netfilter.h:305 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 __br_forward+0x641/0xb00 net/bridge/br_forward.c:109
 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:125
 maybe_deliver+0x2c7/0x390 net/bridge/br_forward.c:181
 br_flood+0x13a/0x3d0 net/bridge/br_forward.c:223
 br_dev_xmit+0x98c/0x15a0 net/bridge/br_device.c:100
 __netdev_start_xmit include/linux/netdevice.h:4406 [inline]
 netdev_start_xmit include/linux/netdevice.h:4420 [inline]
 xmit_one net/core/dev.c:3280 [inline]
 dev_hard_start_xmit+0x1a3/0x9c0 net/core/dev.c:3296
 __dev_queue_xmit+0x2b15/0x3650 net/core/dev.c:3869
 dev_queue_xmit+0x18/0x20 net/core/dev.c:3902
 neigh_resolve_output net/core/neighbour.c:1490 [inline]
 neigh_resolve_output+0x5a5/0x970 net/core/neighbour.c:1470
 neigh_output include/net/neighbour.h:511 [inline]
 ip6_finish_output2+0x1034/0x2520 net/ipv6/ip6_output.c:116
 __ip6_finish_output+0x444/0xa50 net/ipv6/ip6_output.c:142
 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:175
 dst_output include/net/dst.h:436 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ndisc_send_skb+0xf29/0x1450 net/ipv6/ndisc.c:504
 ndisc_send_ns+0x3a9/0x850 net/ipv6/ndisc.c:646
 addrconf_dad_work+0xb88/0x1150 net/ipv6/addrconf.c:4120
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Crashes (126):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/09/14 23:37 upstream a7f89616b737 32d59357 .config console log report syz C ci-upstream-kasan-gce
2019/09/14 20:58 upstream a7f89616b737 32d59357 .config console log report syz C ci-upstream-kasan-gce-root
2019/09/14 19:20 upstream a7f89616b737 32d59357 .config console log report syz C ci-upstream-kasan-gce-root
2019/09/14 13:28 upstream a7f89616b737 32d59357 .config console log report syz C ci-upstream-kasan-gce-smack-root
2019/09/14 02:28 upstream a7f89616b737 32d59357 .config console log report syz C ci-upstream-kasan-gce-root
2019/09/14 01:44 upstream a7f89616b737 32d59357 .config console log report syz C ci-upstream-kasan-gce-selinux-root
2019/09/14 00:55 upstream a7f89616b737 32d59357 .config console log report syz C ci-upstream-kasan-gce-root
2019/09/13 18:34 upstream 505a8ec7e11a 40fa42bc .config console log report syz C ci-upstream-kasan-gce
2019/09/13 16:48 upstream 505a8ec7e11a 40fa42bc .config console log report syz C ci-upstream-kasan-gce-smack-root
2019/09/13 16:31 upstream 505a8ec7e11a 40fa42bc .config console log report syz C ci-upstream-kasan-gce
2019/09/13 13:17 upstream 505a8ec7e11a 40fa42bc .config console log report syz C ci-upstream-kasan-gce
2019/09/13 12:36 upstream 505a8ec7e11a 40fa42bc .config console log report syz C ci-upstream-kasan-gce-root
2019/09/13 00:40 upstream ad32b4800c2b 0b7672ee .config console log report syz C ci-upstream-kasan-gce-selinux-root
2019/09/13 00:19 upstream ad32b4800c2b 0b7672ee .config console log report syz C ci-upstream-kasan-gce-root
2019/09/12 19:13 upstream ad32b4800c2b 0b7672ee .config console log report syz C ci-upstream-kasan-gce-root
2019/09/12 16:38 upstream ad32b4800c2b 0b7672ee .config console log report syz C ci-upstream-kasan-gce-root
2019/09/12 07:54 upstream 3120b9a6a3f7 f4e53c10 .config console log report syz C ci-upstream-kasan-gce
2019/09/12 07:47 upstream 3120b9a6a3f7 f4e53c10 .config console log report syz C ci-upstream-kasan-gce-smack-root
2019/09/12 05:37 upstream 3120b9a6a3f7 f4e53c10 .config console log report syz C ci-upstream-kasan-gce
2019/09/12 03:32 upstream 3120b9a6a3f7 f4e53c10 .config console log report syz C ci-upstream-kasan-gce
2019/09/11 23:48 upstream 3120b9a6a3f7 f4e53c10 .config console log report syz C ci-upstream-kasan-gce-selinux-root
2019/09/11 16:50 upstream 3120b9a6a3f7 a60cb4cd .config console log report syz C ci-upstream-kasan-gce-root
2019/09/06 15:46 upstream 3b47fd5ca9ea 040fda58 .config console log report syz C ci-upstream-kasan-gce
2019/09/14 22:09 upstream a7f89616b737 32d59357 .config console log report syz C ci-upstream-kasan-gce-386
2019/09/13 14:51 upstream 505a8ec7e11a 40fa42bc .config console log report syz C ci-upstream-kasan-gce-386
2019/09/13 10:51 upstream 505a8ec7e11a 40fa42bc .config console log report syz C ci-upstream-kasan-gce-386
2019/09/12 02:16 upstream 3120b9a6a3f7 f4e53c10 .config console log report syz C ci-upstream-kasan-gce-386
2019/09/12 00:07 upstream 3120b9a6a3f7 f4e53c10 .config console log report syz C ci-upstream-kasan-gce-386
2019/09/11 09:48 upstream 3120b9a6a3f7 a60cb4cd .config console log report syz C ci-upstream-kasan-gce-386
2019/09/11 02:36 upstream 3120b9a6a3f7 a60cb4cd .config console log report syz C ci-upstream-kasan-gce-386
2019/09/06 15:18 upstream 3b47fd5ca9ea 040fda58 .config console log report syz C ci-upstream-kasan-gce-386
2019/09/10 14:08 net-old c8dc55956b09 a60cb4cd .config console log report syz C ci-upstream-net-this-kasan-gce
2019/09/15 23:26 net-next-old a3d3c74da49c 32d59357 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/15 18:05 net-next-old a3d3c74da49c 32d59357 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/15 07:21 net-next-old 1ba569fc2250 32d59357 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/14 20:54 net-next-old 1ba569fc2250 32d59357 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/14 16:34 net-next-old 1ba569fc2250 32d59357 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/14 13:11 net-next-old 1ba569fc2250 32d59357 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/14 05:23 net-next-old 022c10d6c73b 32d59357 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/14 00:19 net-next-old 022c10d6c73b 32d59357 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/13 18:29 net-next-old 022c10d6c73b 40fa42bc .config console log report syz C ci-upstream-net-kasan-gce
2019/09/13 12:35 net-next-old 172ca8308b05 40fa42bc .config console log report syz C ci-upstream-net-kasan-gce
2019/09/13 10:54 net-next-old 172ca8308b05 40fa42bc .config console log report syz C ci-upstream-net-kasan-gce
2019/09/12 05:58 net-next-old c1609946b8b6 f4e53c10 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/12 04:08 net-next-old c1609946b8b6 f4e53c10 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/12 01:30 net-next-old c1609946b8b6 f4e53c10 .config console log report syz C ci-upstream-net-kasan-gce
2019/09/11 14:30 net-next-old 747f3cf4bf71 a60cb4cd .config console log report syz C ci-upstream-net-kasan-gce
2019/09/15 18:54 linux-next 6d028043b55e 32d59357 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/09/15 06:26 linux-next 6d028043b55e 32d59357 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/09/15 04:47 linux-next 6d028043b55e 32d59357 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/09/14 19:31 linux-next 6d028043b55e 32d59357 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/09/14 05:31 linux-next 6d028043b55e 32d59357 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/09/13 17:45 linux-next 6d028043b55e 40fa42bc .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/09/11 16:18 linux-next 6d028043b55e a60cb4cd .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/09/11 13:02 linux-next 6d028043b55e a60cb4cd .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/09/13 04:39 upstream 505a8ec7e11a 40fa42bc .config console log report ci-upstream-kasan-gce-root
2019/09/10 23:57 upstream 3120b9a6a3f7 a60cb4cd .config console log report ci-upstream-kasan-gce-smack-root
2019/09/06 13:42 upstream 3b47fd5ca9ea 040fda58 .config console log report ci-upstream-kasan-gce-386
2019/09/06 14:24 net-old 7bdf4de12677 040fda58 .config console log report ci-upstream-net-this-kasan-gce
* Struck through repros no longer work on HEAD.