INFO: task hung in addrconf_dad

Date	Name	Commit	Repro	Result
2025/11/30	linux-6.6.y (ToT)	1e89a1be4fe9	syz	[report] INFO: task hung in new_device_store
2025/11/30	upstream (ToT)	e69c7c175115	syz	Didn't crash

Date

Name

Commit

Repro

Result

2025/11/30

linux-6.6.y (ToT)

1e89a1be4fe9

syz

[report] INFO: task hung in new_device_store

2025/11/30

upstream (ToT)

e69c7c175115

syz

Didn't crash

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-6.1	INFO: task hung in addrconf_dad_work (2)	1				67	545d	751d	0/3	auto-obsoleted due to no activity on 2024/11/26 11:15
android-414	INFO: task hung in addrconf_dad_work	1				1	2472d	2472d	0/1	auto-closed as invalid on 2019/10/25 08:37
upstream	INFO: task hung in addrconf_dad_work (5) net	1	C	done		1648	15h25m	595d	0/29	upstream: reported C repro on 2024/07/29 15:23
android-49	INFO: task hung in addrconf_dad_work	1				1	2759d	2759d	0/3	auto-closed as invalid on 2019/02/22 20:09
upstream	INFO: task hung in addrconf_dad_work (2) net	1	C	unreliable	error	107	844d	1199d	0/29	closed as invalid on 2023/11/23 17:05
linux-6.1	INFO: task hung in addrconf_dad_work (4) origin:upstream missing-backport	1	syz		error	5	78d	291d	0/3	upstream: reported syz repro on 2025/05/29 09:13
linux-6.1	INFO: task hung in addrconf_dad_work	1				2	1033d	1064d	0/3	auto-obsoleted due to no activity on 2023/08/26 05:16
upstream	INFO: task hung in addrconf_dad_work net	1	C	inconclusive	inconclusive	468	1545d	2585d	0/29	closed as invalid on 2022/02/08 10:54
linux-5.15	INFO: task hung in addrconf_dad_work origin:upstream	1	C		error	131	67d	786d	0/3	upstream: reported C repro on 2024/01/20 08:09
upstream	INFO: task hung in addrconf_dad_work (3) net	1	C			185	734d	776d	25/29	fixed on 2024/03/25 23:45
linux-6.1	INFO: task hung in addrconf_dad_work (3)	1				2	404d	436d	0/3	auto-obsoleted due to no activity on 2025/05/16 13:56
linux-4.19	INFO: task hung in addrconf_dad_work	1				1	2394d	2394d	0/1	auto-closed as invalid on 2019/12/24 18:36
linux-4.19	INFO: task hung in addrconf_dad_work (2)	1	C		error	72	1112d	2185d	0/1	upstream: reported C repro on 2020/03/22 17:39
linux-4.14	INFO: task hung in addrconf_dad_work	1	C		inconclusive	1	1360d	1966d	0/1	upstream: reported C repro on 2020/10/27 17:48
upstream	INFO: task hung in addrconf_dad_work (4) net	1				2632	615d	666d	26/29	fixed on 2024/07/09 19:14

Created	Duration	User	Patch	Repo	Result
2026/02/20 09:48	0m	fix candidate		upstream	error job log
2026/01/21 06:43	1m	fix candidate		upstream	error job log

Created

Duration

User

Patch

Repo

Result

2026/02/20 09:48

fix candidate

upstream

error job log

2026/01/21 06:43

fix candidate

upstream

error job log

INFO: task kworker/u4:2:42 blocked for more than 141 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:2 state:D stack:24400 pid:42 ppid:2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: <TASK> context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x6b7/0xcc0 kernel/locking/mutex.c:747 addrconf_dad_work+0xd0/0x14e0 net/ipv6/addrconf.c:4158 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 </TASK> INFO: task syz-executor:5925 blocked for more than 151 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:21192 pid:5925 ppid:1 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x6b7/0xcc0 kernel/locking/mutex.c:747 rtnl_lock net/core/rtnetlink.c:78 [inline] rtnetlink_rcv_msg+0x76f/0xf10 net/core/rtnetlink.c:6469 netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x46a/0x620 net/socket.c:2201

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info	Assets (help?)	Manager	Title
2025/11/26 06:46	linux-6.6.y	1e89a1be4fe9	64219f15	.config	console log	report	syz / log		[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	INFO: task hung in addrconf_dad_work
2026/02/12 08:10	linux-6.6.y	1b4ef5214f17	76a109e2	.config	console log	report		info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan-perf	INFO: task hung in addrconf_dad_work
2026/02/04 20:45	linux-6.6.y	2cf6f68313dc	ea10c935	.config	console log	report		info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan-perf	INFO: task hung in addrconf_dad_work

Crashes (3):

Assets (help?)