INFO: task hung in br_ioctl

ID	Workflow	Result	Correct	Ext Bug ID	Bug	Created	Started	Finished	Revision	Error
b69306c6-e076-49fa-aa60-fdbaf119bb7b	assessment-security	DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓		INFO: task hung in br_ioctl_stub (2)	2026/05/26 04:57	2026/05/26 04:57	2026/05/26 05:53	c69befb30ac10e158cc9d1557b508ee3f0eca1de

Title	Replies (including bot)	Last reply
[syzbot] Monthly bridge report (Apr 2026)	0 (1)	2026/04/07 20:34
[syzbot] [bridge?] INFO: task hung in br_ioctl_stub (2)	0 (1)	2025/12/01 17:08

Title

Replies (including bot)

Last reply

[syzbot] Monthly bridge report (Apr 2026)

0 (1)

2026/04/07 20:34

[syzbot] [bridge?] INFO: task hung in br_ioctl_stub (2)

0 (1)

2025/12/01 17:08

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in br_ioctl_stub bridge	1				1	621d	621d	0/29	auto-obsoleted due to no activity on 2024/12/27 18:28
upstream	INFO: task hung in rtnetlink_rcv_msg net	1	C	inconclusive	inconclusive	1970	702d	2666d	26/29	fixed on 2024/07/09 19:14
linux-5.15	INFO: task hung in br_ioctl_stub	1				2	708d	708d	0/3	auto-obsoleted due to no activity on 2024/10/11 06:35

Rank 🛈

upstream

INFO: task hung in br_ioctl_stub bridge

621d

0/29

auto-obsoleted due to no activity on 2024/12/27 18:28

upstream

INFO: task hung in rtnetlink_rcv_msg net

inconclusive

1970

702d

2666d

26/29

fixed on 2024/07/09 19:14

linux-5.15

INFO: task hung in br_ioctl_stub

708d

0/3

auto-obsoleted due to no activity on 2024/10/11 06:35

Created	Duration	User	Repo	Result
2026/05/04 23:13	23m	retest repro	upstream	error
2026/02/19 17:39	18m	retest repro	upstream	report log
2025/12/11 17:03	18m	retest repro	upstream	report log

Created

Duration

User

Patch

Repo

Result

2026/05/04 23:13

23m

retest repro

upstream

error

2026/02/19 17:39

18m

retest repro

upstream

report log

2025/12/11 17:03

18m

retest repro

upstream

report log

INFO: task syz.0.27:5720 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.27 state:D stack:28904 pid:5720 tgid:5719 ppid:5469 task_flags:0x400140 flags:0x00080002 Call Trace: <TASK> context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0x165/0x360 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760 br_ioctl_stub+0x199/0xc80 net/bridge/br_ioctl.c:418 br_ioctl_call net/socket.c:1227 [inline] sock_ioctl+0x4d8/0x790 net/socket.c:1329 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f91bf78f7c9 RSP: 002b:00007f91c0675038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f91bf9e5fa0 RCX: 00007f91bf78f7c9 RDX: 0000200000000000 RSI: 00000000000089a2 RDI: 0000000000000003 RBP: 00007f91bf813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f91bf9e6038 R14: 00007f91bf9e5fa0 R15: 00007ffd440d2c68 </TASK> INFO: task kworker/u4:11:5722 blocked for more than 150 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:11 state:D stack:28872 pid:5722 tgid:5722 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events_unbound linkwatch_event Call Trace: <TASK> context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0x165/0x360 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/11/27 17:00	upstream	765e56e41a5a	e8331348	.config	console log	report	syz / log			[disk image (non-bootable)] [vmlinux] [kernel image]	ci-snapshot-upstream-root	INFO: task hung in br_ioctl_stub
2026/04/07 17:23	linux-next	cc13002a9f98	628666c6	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-rust-kasan-gce	INFO: task hung in br_ioctl_stub

Crashes (2):

Assets (help?)