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INFO: task hung in sit_exit_batch_net

Status: auto-closed as invalid on 2022/05/03 11:37
Reported-by: syzbot+5df4c4b3ac780074f124@syzkaller.appspotmail.com
First crash: 1480d, last: 1444d
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in sit_exit_batch_net (2) 1 1 19d 19d 0/3 upstream: reported on 2025/11/28 13:18
upstream INFO: task hung in sit_exit_batch_net net 1 2 2294d 2303d 0/29 closed as invalid on 2019/10/23 07:54
linux-6.1 INFO: task hung in sit_exit_batch_net 1 1 548d 548d 0/3 auto-obsoleted due to no activity on 2024/09/25 01:30
upstream INFO: task hung in sit_exit_batch_net (3) net 1 1 1268d 1268d 0/29 auto-closed as invalid on 2022/09/26 13:51
upstream INFO: task hung in sit_exit_batch_net (2) net 1 1 1844d 1844d 0/29 auto-closed as invalid on 2021/02/27 16:17
upstream INFO: task hung in sit_exit_batch_net (4) net 1 2 1121d 1128d 0/29 auto-obsoleted due to no activity on 2023/02/12 17:49

Sample crash report:
Bluetooth: hci3: command 0x0406 tx timeout
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
INFO: task syz-executor.1:24565 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D27504 24565  17062 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
 __mutex_lock_common kernel/locking/mutex.c:1016 [inline]
 __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078
 sit_exit_batch_net+0x88/0x700 net/ipv6/sit.c:1889
 ops_exit_list+0xf9/0x150 net/core/net_namespace.c:156
 setup_net+0x3d1/0x720 net/core/net_namespace.c:333

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/01/03 11:37 linux-4.19.y 3f8a27f9e27b e1768e9c .config console log report info ci2-linux-4-19 INFO: task hung in sit_exit_batch_net
2021/11/28 11:15 linux-4.19.y 3f8a27f9e27b 63eeac02 .config console log report info ci2-linux-4-19 INFO: task hung in sit_exit_batch_net
* Struck through repros no longer work on HEAD.