INFO: rcu detected stall in addrconf_dad

Date	Name	Commit	Repro	Result
2024/11/23	upstream (ToT)	42d9e8b7ccdd	C	[report] INFO: rcu detected stall in tc_modify_qdisc

Date

Name

Commit

Repro

Result

2024/11/23

upstream (ToT)

42d9e8b7ccdd

[report] INFO: rcu detected stall in tc_modify_qdisc

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in addrconf_dad_work (5) net	1	C	done	inconclusive	19	17h25m	1951d	0/29	upstream: reported C repro on 2020/09/07 15:59
upstream	INFO: rcu detected stall in addrconf_dad_work (4) cgroups mm	1				8	2194d	2194d	0/29	closed as invalid on 2020/01/09 08:13
upstream	INFO: rcu detected stall in addrconf_dad_work (3) mm	1				6	2194d	2194d	0/29	closed as invalid on 2020/01/08 05:23
linux-4.14	INFO: rcu detected stall in addrconf_dad_work	1	C		done	18	2310d	2317d	1/1	fixed on 2019/12/06 10:33
upstream	INFO: rcu detected stall in addrconf_dad_work (2) mm	1				15	2229d	2230d	0/29	closed as invalid on 2019/12/04 14:14
upstream	INFO: rcu detected stall in addrconf_dad_work	1	C	done		126	2308d	2314d	13/29	fixed on 2019/10/09 10:54
linux-4.19	INFO: rcu detected stall in addrconf_dad_work (2)	1	C		done	1	2213d	2213d	1/1	fixed on 2020/01/19 15:05
linux-5.15	INFO: rcu detected stall in addrconf_dad_work origin:lts-only	1	syz		done	5	176d	496d	0/3	upstream: reported syz repro on 2024/09/01 00:22
linux-4.19	INFO: rcu detected stall in addrconf_dad_work	1	C		done	19	2305d	2317d	1/1	fixed on 2019/12/07 19:18
linux-5.15	BUG: soft lockup in addrconf_dad_work	1				1	908d	908d	0/3	auto-obsoleted due to no activity on 2023/10/25 16:01
linux-4.19	BUG: soft lockup in addrconf_dad_work	1	C		error	55	1085d	1427d	0/1	upstream: reported C repro on 2022/02/13 10:05
android-5-15	BUG: soft lockup in addrconf_dad_work	1				3	568d	623d	0/2	auto-obsoleted due to no activity on 2024/09/19 17:30

Created	Duration	User	Repo	Result
2025/12/26 04:09	2h28m	bisect fix	linux-6.1.y	OK (0) job log log
2025/11/21 18:54	4h43m	bisect fix	linux-6.1.y	OK (0) job log log
2025/10/20 22:06	1h46m	bisect fix	linux-6.1.y	OK (0) job log log
2025/09/15 13:58	1h56m	bisect fix	linux-6.1.y	OK (0) job log log
2025/08/08 22:53	1h49m	bisect fix	linux-6.1.y	OK (0) job log log
2025/07/08 10:17	1h40m	bisect fix	linux-6.1.y	OK (0) job log log
2025/06/07 22:45	2h01m	bisect fix	linux-6.1.y	OK (0) job log log
2025/05/08 02:34	2h45m	bisect fix	linux-6.1.y	OK (0) job log log
2025/04/06 17:05	1h55m	bisect fix	linux-6.1.y	OK (0) job log log
2025/02/13 22:14	1h40m	bisect fix	linux-6.1.y	OK (0) job log log
2025/01/11 00:05	2h07m	bisect fix	linux-6.1.y	OK (0) job log log

Created

Duration

User

Patch

Repo

Result

2025/12/26 04:09

2h28m

bisect fix

linux-6.1.y

OK (0) job log log

2025/11/21 18:54

4h43m

bisect fix

linux-6.1.y

OK (0) job log log

2025/10/20 22:06

1h46m

bisect fix

linux-6.1.y

OK (0) job log log

2025/09/15 13:58

1h56m

bisect fix

linux-6.1.y

OK (0) job log log

2025/08/08 22:53

1h49m

bisect fix

linux-6.1.y

OK (0) job log log

2025/07/08 10:17

1h40m

bisect fix

linux-6.1.y

OK (0) job log log

2025/06/07 22:45

2h01m

bisect fix

linux-6.1.y

OK (0) job log log

2025/05/08 02:34

2h45m

bisect fix

linux-6.1.y

OK (0) job log log

2025/04/06 17:05

1h55m

bisect fix

linux-6.1.y

OK (0) job log log

2025/02/13 22:14

1h40m

bisect fix

linux-6.1.y

OK (0) job log log

2025/01/11 00:05

2h07m

bisect fix

linux-6.1.y

OK (0) job log log

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=2a34/1/0x4000000000000000 softirq=10327/10328 fqs=0 (detected by 0, t=10506 jiffies, g=10653, q=23 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4307 Comm: kworker/1:3 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] RIP: 0010:_raw_spin_lock_irqsave+0x9f/0xf0 kernel/locking/spinlock.c:162 Code: 02 00 00 74 05 e8 d1 c3 6c f7 bf 01 00 00 00 e8 07 45 3d f7 48 8d 7b 18 31 f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 ff 75 08 <e8> 5c 86 48 f7 48 83 c4 08 48 89 df e8 d0 c9 49 f7 48 c7 04 24 0e RSP: 0018:ffffc900001e0bf8 EFLAGS: 00000046 RAX: 0000000000010003 RBX: ffffffff96c07180 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff96c07198 RBP: ffffc900001e0c88 R08: 0000000000000001 R09: 0000000000000000 R10: ffffed1005d4b86b R11: 1ffff11005d4b868 R12: dffffc0000000000 R13: ffffffff96c07178 R14: 0000000000000802 R15: 1ffff9200003c180 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000300 CR3: 0000000026a91000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> debug_object_deactivate+0x63/0x340 lib/debugobjects.c:753 debug_hrtimer_deactivate kernel/time/hrtimer.c:453 [inline] debug_deactivate+0x29/0x240 kernel/time/hrtimer.c:509 __run_hrtimer kernel/time/hrtimer.c:1715 [inline] __hrtimer_run_queues+0x2df/0xd60 kernel/time/hrtimer.c:1811 hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1873 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:49 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:178 [inline] RIP: 0010:unwind_next_frame+0x1380/0x20b0 arch/x86/kernel/unwind_orc.c:448 Code: 0f b6 04 08 84 c0 75 27 49 63 06 4c 01 f0 49 8d 4e 04 48 39 e8 4c 0f 46 e9 49 8d 46 fc 4c 0f 47 e0 4d 0f 46 fe 4d 39 e5 76 a8 <e9> d6 ee ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 7c cc 4c 89 f7 48 RSP: 0018:ffffc90004407410 EFLAGS: 00000202 RAX: ffffffff8e66022c RBX: ffffc900044074e8 RCX: ffffffff8e660234 RDX: ffffffff8f011e12 RSI: ffffffff8e660230 RDI: ffffffff8138655f RBP: ffffffff88dc7f6d R08: 0000000000000001 R09: 0000000000000006 R10: fffff52000880ea9 R11: 1ffff92000880ea7 R12: ffffffff8e660230 R13: ffffffff8e660234 R14: ffffffff8e660230 R15: ffffffff8e660230 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:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] kmem_cache_alloc_node+0x14d/0x320 mm/slub.c:3404 __alloc_skb+0xfc/0x7e0 net/core/skbuff.c:505 alloc_skb include/linux/skbuff.h:1271 [inline] ndisc_alloc_skb+0xa6/0x450 net/ipv6/ndisc.c:423 ndisc_ns_create+0x1ce/0x620 net/ipv6/ndisc.c:626 ndisc_send_ns+0xab/0x150 net/ipv6/ndisc.c:668 addrconf_dad_work+0xa15/0x14d0 net/ipv6/addrconf.c:4219 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> rcu: rcu_preempt kthread starved for 10506 jiffies! g10653 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:27840 pid:16 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 schedule_timeout+0x15c/0x280 kernel/time/timer.c:2168 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> rcu: Stack dump where RCU GP kthread last ran: CPU: 0 PID: 4421 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline] RIP: 0010:smp_call_function_many_cond+0xe7b/0x1270 kernel/smp.c:998 Code: 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 5d d9 0a 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 e9 d5 0a 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 ce d5 0a RSP: 0018:ffffc90003357760 EFLAGS: 00000293 RAX: ffffffff81760a02 RBX: dffffc0000000000 RCX: ffff88807c639dc0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900033578c0 R08: dffffc0000000000 R09: fffffbfff211904f R10: fffffbfff211904f R11: 1ffffffff211904e R12: 1ffff110171e81c9 R13: ffff8880b8e3bb80 R14: 0000000000000001 R15: ffff8880b8f40e48 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc9c153910 CR3: 000000000c68e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1165 __flush_tlb_multi arch/x86/include/asm/paravirt.h:87 [inline] flush_tlb_multi arch/x86/mm/tlb.c:970 [inline] flush_tlb_mm_range+0x409/0x610 arch/x86/mm/tlb.c:1058 tlb_flush arch/x86/include/asm/tlb.h:20 [inline] tlb_flush_mmu_tlbonly+0x1b1/0x3f0 include/asm-generic/tlb.h:430 tlb_flush_mmu+0x28/0x210 mm/mmu_gather.c:260 tlb_finish_mmu+0xbd/0x1c0 mm/mmu_gather.c:361 exit_mmap+0x343/0x8e0 mm/mmap.c:3262 __mmput+0x118/0x3c0 kernel/fork.c:1200 exit_mm+0x1e6/0x2c0 kernel/exit.c:565 do_exit+0x8c1/0x2400 kernel/exit.c:867 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 __do_sys_exit_group kernel/exit.c:1033 [inline] __se_sys_exit_group kernel/exit.c:1031 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1031 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f46dad8f749 Code: Unable to access opcode bytes at 0x7f46dad8f71f. RSP: 002b:00007ffc9c09f258 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f46dad8f749 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000003 R08: 0000000b9c09f34f R09: 00007f46dafb4280 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f46dafb4280 R14: 0000000000000003 R15: 00007ffc9c09f310 </TASK>

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Assets (help?)	Manager	Title
2026/01/10 08:40	linux-6.1.y	50cbba13faa2	d6526ea3	.config	console log	report	syz / log	C	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan	INFO: rcu detected stall in addrconf_dad_work
2024/11/22 07:18	linux-6.1.y	b67dc5c9ade9	4b25d554	.config	console log	report	syz / log	C	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan	INFO: rcu detected stall in addrconf_dad_work
2025/03/03 23:57	linux-6.1.y	3a8358583626	c3901742	.config	console log	report	syz / log		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-arm64	INFO: rcu detected stall in addrconf_dad_work

Crashes (3):

Assets (help?)