INFO: task hung in ip6gre_exit_batch

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in ip6gre_exit_batch_net (6) net	1				1	1099d	1099d	0/29	closed as invalid on 2023/09/07 14:36
upstream	INFO: task hung in ip6gre_exit_batch_net (2) net	1				3	2432d	2432d	0/29	auto-closed as invalid on 2020/01/17 16:16
linux-5.15	INFO: task hung in ip6gre_exit_batch_net (2) origin:upstream	1	syz		error	1	234d	234d	0/3	upstream: reported syz repro on 2025/11/24 02:32
linux-6.1	INFO: task hung in ip6gre_exit_batch_net (2) origin:lts-only	1	C		done	1	62d	62d	3/3	fixed on 2026/06/16 10:34
linux-4.19	INFO: task hung in ip6gre_exit_batch_net (2)	1				1	2046d	2046d	0/1	auto-closed as invalid on 2021/04/06 21:09
linux-4.19	INFO: task hung in ip6gre_exit_batch_net (3)	1				7	1645d	1812d	0/1	auto-closed as invalid on 2022/05/13 06:16
upstream	INFO: task hung in ip6gre_exit_batch_net (4) net	1	syz	unreliable		44	1699d	1751d	0/29	closed as invalid on 2021/12/14 20:12
upstream	INFO: task hung in ip6gre_exit_batch_net net	1				6	2471d	2964d	0/29	closed as dup on 2018/06/04 15:23
linux-6.1	INFO: task hung in ip6gre_exit_batch_net	1				1	768d	768d	0/3	auto-obsoleted due to no activity on 2024/09/16 14:37
upstream	INFO: task hung in ip6gre_exit_batch_net (5) net	1				1	1477d	1477d	0/29	auto-closed as invalid on 2022/09/28 06:40
linux-4.19	INFO: task hung in ip6gre_exit_batch_net	1				1	2449d	2449d	0/1	auto-closed as invalid on 2020/02/29 06:17
upstream	INFO: task hung in ip6gre_exit_batch_net (3) net	1				18	1935d	2250d	0/29	auto-closed as invalid on 2021/06/27 10:57

INFO: task kworker/u4:0:9 blocked for more than 143 seconds. Not tainted 5.15.160-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:0 state:D stack:21760 pid: 9 ppid: 2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: <TASK> context_switch kernel/sched/core.c:5030 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376 schedule+0x11b/0x1f0 kernel/sched/core.c:6459 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518 __mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 ip6gre_exit_batch_net+0xc0/0x460 net/ipv6/ip6_gre.c:1647 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x763/0xb60 net/core/net_namespace.c:599

Crashes (4):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Assets (help?)	Manager	Title
2024/06/08 15:08	linux-5.15.y	c61bd26ae81a	82c05ab8	.config	console log	report	info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: task hung in ip6gre_exit_batch_net
2024/05/25 21:10	linux-5.15.y	c61bd26ae81a	a10a183e	.config	console log	report	info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: task hung in ip6gre_exit_batch_net
2024/05/22 13:52	linux-5.15.y	83655231580b	4d098039	.config	console log	report	info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: task hung in ip6gre_exit_batch_net
2024/05/22 11:04	linux-5.15.y	83655231580b	4d098039	.config	console log	report	info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: task hung in ip6gre_exit_batch_net

Crashes (4):