INFO: rcu detected stall in addrconf_rs

INFO: rcu detected stall in addrconf_rs_timer (4)
Status: upstream: reported C repro on 2020/08/03 16:25
Reported-by: syzbot+ca2665ae8487c46d365d@syzkaller.appspotmail.com
First crash: 420d, last: 13d

Cause bisection: failed (bisect log)

Fix bisection: failed (bisect log)

similar bugs (9):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in addrconf_rs_timer (2)				362	566d	589d	14/22	fixed on 2019/10/21 12:31
linux-4.14	INFO: rcu detected stall in addrconf_rs_timer	C		error	220	230d	593d	0/1	upstream: reported C repro on 2019/09/06 14:33
upstream	INFO: rcu detected stall in addrconf_rs_timer				38	853d	949d	0/22	closed as dup on 2019/01/02 16:33
linux-4.19	INFO: rcu detected stall in addrconf_rs_timer				45	581d	593d	0/1	auto-closed as invalid on 2019/12/17 18:46
upstream	INFO: rcu detected stall in addrconf_rs_timer (3)	C	inconclusive	done	81	488d	484d	16/22	fixed on 2020/02/18 14:31
linux-4.19	INFO: rcu detected stall in addrconf_rs_timer (2)				5	231d	304d	0/1	auto-closed as invalid on 2020/12/31 12:17
linux-4.19	BUG: soft lockup in addrconf_rs_timer	syz		error	1	33d	33d	0/1	upstream: reported syz repro on 2021/03/19 06:05
linux-4.14	BUG: soft lockup in addrconf_rs_timer	C		error	32	5d21h	591d	0/1	upstream: reported C repro on 2019/09/08 14:09
upstream	BUG: soft lockup in addrconf_rs_timer				18	395d	591d	0/22	auto-closed as invalid on 2020/07/20 22:25

Sample crash report:

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10446 ticks this GP) idle=c0a/1/0x4000000000000000 softirq=11160/11165 fqs=225 
	(t=10502 jiffies g=11097 q=636)
rcu: rcu_preempt kthread starved for 4193 jiffies! g11097 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:29176 pid:   11 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3779 [inline]
 __schedule+0x893/0x2130 kernel/sched/core.c:4528
 schedule+0xcf/0x270 kernel/sched/core.c:4606
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1871
 rcu_gp_fqs_loop kernel/rcu/tree.c:1925 [inline]
 rcu_gp_kthread+0xb4c/0x1c90 kernel/rcu/tree.c:2099
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
NMI backtrace for cpu 0
CPU: 0 PID: 10177 Comm: syz-executor702 Not tainted 5.10.0-rc6-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+0x107/0x163 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331
 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:637 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567
 update_process_times+0x77/0xd0 kernel/time/timer.c:1709
 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:1519 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:slab_alloc_node mm/slub.c:2832 [inline]
RIP: 0010:slab_alloc mm/slub.c:2899 [inline]
RIP: 0010:kmem_cache_alloc+0x138/0x440 mm/slub.c:2904
Code: c6 c7 35 b1 81 48 c7 c7 e0 78 33 8b e8 21 ef a4 ff 45 31 ed e9 bd 00 00 00 45 31 f6 48 85 ed 74 f0 48 8b 45 00 65 48 8b 50 08 <48> 89 c1 65 48 03 0d 65 5f 50 7e 48 8b 71 08 48 39 f2 75 e7 48 8b
RSP: 0018:ffffc90000007990 EFLAGS: 00000286
RAX: 0000607f45e04f00 RBX: ffff88802794e480 RCX: ffffffff86f55f43
RDX: 0000000000004560 RSI: 00000000000000e8 RDI: ffffffff8b45ada0
RBP: ffff88802075c500 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000a20
R13: ffffffff86f55b1e R14: 0000000000000000 R15: 0000000000000a20
 dst_alloc+0x9e/0x650 net/core/dst.c:93
 ip6_dst_alloc+0x2e/0x100 net/ipv6/route.c:356
 icmp6_dst_alloc+0x6d/0x6c0 net/ipv6/route.c:3167
 ndisc_send_skb+0x1207/0x1720 net/ipv6/ndisc.c:488
 ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:702
 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3873
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410
 expire_timers kernel/time/timer.c:1455 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747
 __run_timers kernel/time/timer.c:1728 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/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+0x132/0x200 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:call_rcu+0x2e7/0x700 kernel/rcu/tree.c:3028
Code: 3c 02 00 0f 85 bb 03 00 00 48 8b 05 53 98 d6 09 49 03 84 24 f0 00 00 00 49 39 c7 0f 8f 65 01 00 00 e8 0d 63 18 00 ff 34 24 9d <48> 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 80 3c 02 00 0f 84 2f
RSP: 0018:ffffc9000b1cf7c8 EFLAGS: 00000246
RAX: 0000000000138ecb RBX: ffff88801c6d2e08 RCX: ffffffff8155a937
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8880b9e35830 R08: 0000000000000001 R09: ffffffff8ebaf67f
R10: fffffbfff1d75ecf R11: 1ffffffff1ced6ef R12: ffff8880b9e35740
R13: ffff8880b9e35820 R14: ffff8880b9e357d8 R15: 0000000000000004
 put_task_struct_rcu_user+0x7f/0xb0 kernel/exit.c:178
 finish_task_switch+0x548/0x7a0 kernel/sched/core.c:3652
 context_switch kernel/sched/core.c:3782 [inline]
 __schedule+0x89b/0x2130 kernel/sched/core.c:4528
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4687
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40
 __mutex_lock_common kernel/locking/mutex.c:964 [inline]
 __mutex_lock+0xc00/0x10e0 kernel/locking/mutex.c:1103
 futex_cleanup_begin kernel/futex.c:3677 [inline]
 futex_exit_release+0x26/0x220 kernel/futex.c:3729
 exit_mm_release+0x16/0x30 kernel/fork.c:1322
 exit_mm kernel/exit.c:438 [inline]
 do_exit+0x60d/0x29b0 kernel/exit.c:796
 do_group_exit+0x125/0x310 kernel/exit.c:906
 get_signal+0x42a/0x1f10 kernel/signal.c:2758
 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x449f79
Code: e8 ac e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 ab 03 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2b9fc53db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dfc28 RCX: 0000000000449f79
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dfc28
RBP: 00000000006dfc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dfc2c
R13: 00007fff52ae4c5f R14: 00007f2b9fc549c0 R15: 00000000006dfc2c

Crashes (115):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-root	2020/12/07 05:00	upstream	e6585a49	c521566d	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/12/05 18:39	upstream	b3298500	50503117	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/08/27 11:13	upstream	15bc20c6	816e0689	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/07/04 04:30	upstream	7cc2a8ea	51095195	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/03/11 05:30	upstream	e9414845	35f53e45	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/03/10 22:53	upstream	30bb5572	35f53e45	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2020/03/08 17:56	upstream	61a09258	2e9971bb	.config	log	report	syz
ci-upstream-kasan-gce-root	2021/04/08 14:17	upstream	454859c5	6a81331a	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/04/05 21:10	upstream	0a50438c	6a81331a	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/02/23 20:05	upstream	3b9cdafb	fcc6d71b	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/02/23 16:12	upstream	3b9cdafb	fcc6d71b	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/02/22 19:08	upstream	a99163e9	c26fb06b	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/02/21 20:23	upstream	55f62bc8	a659b3f1	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/02/19 17:59	upstream	f40ddce8	f689d40a	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/02/15 06:10	upstream	f40ddce8	98682e5e	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/02/14 22:45	upstream	358fecee	98682e5e	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/02/13 03:52	upstream	dcc0b490	98682e5e	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce	2021/02/12 16:15	upstream	dcc0b490	a5f86b15	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/02/08 15:56	upstream	92bf2261	2ce644fc	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/29 21:27	upstream	bec4c296	fc9fd31e	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/29 11:58	upstream	bec4c296	6593fd32	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/27 23:57	upstream	76c057c8	eefc07f2	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/27 22:52	upstream	76c057c8	eefc07f2	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/27 03:12	upstream	13391c60	55a7d4df	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/24 20:15	upstream	e6806137	52e37319	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce	2021/01/23 21:21	upstream	fe75a218	52e37319	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/22 09:10	upstream	9f29bd8b	d4f4eca5	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/21 03:16	upstream	75439bc4	d4f4eca5	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/20 17:36	upstream	45dfb8a5	d4f4eca5	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/19 17:24	upstream	1e2a199f	63631df1	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/19 05:43	upstream	1e2a199f	63631df1	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-selinux-root	2021/01/19 04:19	upstream	1e2a199f	63631df1	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/19 02:19	upstream	19c329f6	63631df1	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/17 23:36	upstream	a1339d63	813be542	.config	log	report			info	INFO: rcu detected stall in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/02/05 13:32	upstream	dd86e7fa	23a562df	.config	log	report			info	BUG: soft lockup in addrconf_rs_timer
ci-upstream-kasan-gce-root	2021/01/15 05:41	upstream	14662050	65a7a854	.config	log	report			info
ci-upstream-kasan-gce-root	2021/01/14 08:02	upstream	65f0d241	269d24e8	.config	log	report			info
ci-upstream-kasan-gce-root	2021/01/10 14:12	upstream	2ff90100	2c1f2513	.config	log	report			info
ci-upstream-kasan-gce-root	2021/01/09 21:11	upstream	996e435f	2c1f2513	.config	log	report			info
ci-upstream-kasan-gce-root	2021/01/04 21:49	upstream	36bbbd0e	2a28ff1f	.config	log	report			info
ci-upstream-kasan-gce	2021/01/02 03:31	upstream	eda809ae	79264ae3	.config	log	report			info
ci-upstream-kasan-gce-root	2021/01/02 00:02	upstream	eda809ae	79264ae3	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/30 05:34	upstream	139711f0	0fa352f2	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/29 15:59	upstream	dea8dcf2	80910769	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/16 12:23	upstream	d635a69d	f213e07e	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/15 08:40	upstream	148842c9	97183ed7	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/14 17:47	upstream	2c85ebc5	97183ed7	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/14 06:43	upstream	6bff9bb8	b22a7ec3	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/13 23:23	upstream	6bff9bb8	b22a7ec3	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/13 17:15	upstream	6bff9bb8	bca53db9	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/12 19:04	upstream	7f376f19	bca53db9	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/12 09:54	upstream	7f376f19	bca53db9	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/11 11:47	upstream	33dc9614	f900b48c	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/11 07:47	upstream	33dc9614	f900b48c	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/10 15:36	upstream	a2f5ea9e	f900b48c	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/10 04:21	upstream	a68a0262	c090b4da	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/09 23:09	upstream	a68a0262	c090b4da	.config	log	report			info
ci-upstream-kasan-gce-smack-root	2020/08/05 17:32	upstream	442489c2	b7129355	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/02/26 03:07	upstream	f8788d86	59b57593	.config	log	report
ci-upstream-kasan-gce-386	2020/12/06 06:23	upstream	33256ce1	f12ba0c5	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/03/28 14:27	bpf-next	2cf69d3f	f1ebdfba	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2021/01/11 07:13	linux-next	ef8b014e	2c1f2513	.config	log	report			info