INFO: task hung in tun_chr_close (4)

Status: upstream: reported on 2023/01/18 07:05
Reported-by: syzbot+4d107adbee80326ca85c@syzkaller.appspotmail.com
First crash: 1304d, last: 1277d
▶ ▼ Similar bugs (15)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: task hung in tun_chr_close 1 40 637d 879d 0/3 auto-obsoleted due to no activity on 2025/02/09 21:18
linux-4.19 INFO: task hung in tun_chr_close 1 1 2194d 2194d 0/1 auto-closed as invalid on 2020/12/09 18:55
linux-6.6 INFO: task hung in tun_chr_close origin:lts-only 1 syz, C error 1 98d 98d 0/2 upstream: reported C repro on 2026/05/09 00:17
upstream INFO: task hung in tun_chr_close (5) net prio:high 1 syz, C done 700 1d15h 698d 0/29 upstream: reported C repro on 2024/09/15 19:59
upstream INFO: task hung in tun_chr_close (4) net 1 syz unreliable error 14 1735d 1796d 0/29 auto-closed as invalid on 2022/09/18 21:51
upstream INFO: task hung in tun_chr_close net 1 5 2519d 3101d 0/29 closed as dup on 2018/02/16 08:24
linux-4.19 INFO: task hung in tun_chr_close (3) 1 1 1470d 1470d 0/1 auto-obsoleted due to no activity on 2022/12/03 04:48
linux-6.1 INFO: task hung in tun_chr_close 1 31 749d 815d 0/3 auto-obsoleted due to no activity on 2024/10/04 23:47
upstream INFO: task hung in rtnetlink_rcv_msg net 1 syz, C inconclusive inconclusive 1970 766d 2730d 26/29 fixed on 2024/07/09 19:14
android-49 INFO: task hung in tun_chr_close 1 1 3016d 3015d 0/3 auto-closed as invalid on 2019/02/22 14:33
linux-4.19 INFO: task hung in tun_chr_close (2) 1 6 1683d 1777d 0/1 auto-closed as invalid on 2022/05/04 09:03
linux-6.1 INFO: task hung in tun_chr_close (2) 1 1 227d 227d 0/3 auto-obsoleted due to no activity on 2026/04/09 21:13
upstream INFO: task hung in tun_chr_close (3) net 1 1 1907d 1907d 0/29 auto-closed as invalid on 2021/08/23 13:06
android-44 INFO: task hung in tun_chr_close 1 1 3025d 3025d 0/2 auto-closed as invalid on 2019/02/22 15:23
upstream INFO: task hung in tun_chr_close (2) net 1 7 2015d 2237d 0/29 auto-closed as invalid on 2021/05/17 11:47

Sample crash report:
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
Bluetooth: hci0: command 0x1009 tx timeout
Bluetooth: hci0: command 0x0c14 tx timeout
Bluetooth: hci0: unexpected event for opcode 0x0c14
INFO: task syz-executor.0:5227 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
Bluetooth: hci0: command 0x0409 tx timeout
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D27536  5227   2930 0x80000002
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
Bluetooth: hci2: command 0x0409 tx timeout
Bluetooth: hci0: command 0x041b tx timeout
 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
Bluetooth: hci2: command 0x041b tx timeout
Bluetooth: hci0: command 0x040f tx timeout
 tun_detach drivers/net/tun.c:759 [inline]
 tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323
Bluetooth: hci2: command 0x040f tx timeout
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xbf3/0x2be0 kernel/exit.c:870
Bluetooth: hci0: command 0x0419 tx timeout
Bluetooth: hci1: command 0x0409 tx timeout
Bluetooth: hci2: command 0x0419 tx timeout
 do_group_exit+0x125/0x310 kernel/exit.c:967
 get_signal+0x3f2/0x1f70 kernel/signal.c:2589
 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/02/14 18:48 linux-4.19.y 3f8a27f9e27b e62ba3c1 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 INFO: task hung in tun_chr_close
2023/01/28 15:30 linux-4.19.y 3f8a27f9e27b 9dfcf09c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 INFO: task hung in tun_chr_close
2023/01/18 07:05 linux-4.19.y 3f8a27f9e27b 42660d9e .config console log report info [disk image] [vmlinux] ci2-linux-4-19 INFO: task hung in tun_chr_close
* Struck through repros no longer work on HEAD.