INFO: task hung in __tun_chr_ioctl

Status: auto-obsoleted due to no activity on 2024/10/03 23:39
Reported-by: syzbot+76d4cd31fb735ca7d46a@syzkaller.appspotmail.com
First crash: 780d, last: 761d
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in __tun_chr_ioctl 1 8 769d 795d 0/3 auto-obsoleted due to no activity on 2024/09/25 13:24
upstream INFO: task hung in __tun_chr_ioctl (4) net 1 1 1208d 1208d 0/29 auto-obsoleted due to no activity on 2023/07/04 14:00
upstream INFO: task hung in __tun_chr_ioctl net 1 2 2819d 3051d 0/29 closed as dup on 2018/03/19 06:35
linux-6.6 INFO: task hung in __tun_chr_ioctl 1 1 222d 222d 0/2 auto-obsoleted due to no activity on 2026/03/26 10:17
upstream INFO: task hung in __tun_chr_ioctl (7) wireguard ppp 1 6 206d 315d 0/29 auto-obsoleted due to no activity on 2026/04/02 00:27
upstream INFO: task hung in __tun_chr_ioctl (5) net 1 1 913d 913d 0/29 auto-obsoleted due to no activity on 2024/04/24 22:34
upstream INFO: task hung in __tun_chr_ioctl (6) net 1 76 536d 779d 0/29 auto-obsoleted due to no activity on 2025/04/16 11:29
upstream INFO: task hung in __tun_chr_ioctl (3) net 1 2 1400d 1489d 0/29 auto-obsoleted due to no activity on 2023/01/03 09:42
upstream INFO: task hung in __tun_chr_ioctl (2) wireguard 1 1 1853d 1853d 0/29 auto-closed as invalid on 2021/09/27 23:09

Sample crash report:
INFO: task syz.4.722:6267 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:syz.4.722       state:D stack:27520 pid: 6267 ppid:  5730 flags:0x00004004
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
 __tun_chr_ioctl+0x460/0x2270 drivers/net/tun.c:3049

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/25 23:38 linux-5.15.y 4878aadf2d15 dec8bc94 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in __tun_chr_ioctl
2024/06/06 21:32 linux-5.15.y c61bd26ae81a 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in __tun_chr_ioctl
* Struck through repros no longer work on HEAD.