INFO: task hung in nsim

INFO: task hung in nsim_create

Status: upstream: reported on 2024/06/17 22:39
Reported-by: syzbot+8fb582c141a7da513d75@syzkaller.appspotmail.com
First crash: 8d20h, last: 8d20h

▶ ▼ Similar bugs (2)

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-6.1	INFO: task hung in nsim_create				1	37d	37d	0/3	upstream: reported on 2024/05/20 16:47
upstream	INFO: task hung in nsim_create net				1	141d	141d	26/27	fixed on 2024/03/25 23:45

Sample crash report:

INFO: task kworker/u4:0:9 blocked for more than 143 seconds.
      Not tainted 5.15.161-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:0    state:D stack:22712 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
 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:310 [inline]
 nsim_create+0x2ec/0x3e0 drivers/net/netdevsim/netdev.c:365
 __nsim_dev_port_add+0x6de/0xb90 drivers/net/netdevsim/dev.c:1312
 nsim_dev_port_add_all drivers/net/netdevsim/dev.c:1372 [inline]
 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1421 [inline]
 nsim_dev_reload_up+0x6c9/0x970 drivers/net/netdevsim/dev.c:910
 devlink_reload+0x31a/0x750 net/core/devlink.c:3970
 devlink_pernet_pre_exit+0x1ca/0x350 net/core/devlink.c:11543

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2024/06/17 22:38	linux-5.15.y	4878aadf2d15	1f11cfd7	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: task hung in nsim_create

* ~~Struck through~~ repros no longer work on HEAD.