INFO: task hung in tun_chr_close

Status: auto-closed as invalid on 2020/12/09 18:55
Reported-by: syzbot+eb210389a4b2417203f1@syzkaller.appspotmail.com
First crash: 2172d, last: 2172d
▶ ▼ 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 615d 857d 0/3 auto-obsoleted due to no activity on 2025/02/09 21:18
linux-6.6 INFO: task hung in tun_chr_close origin:lts-only 1 C error 1 76d 76d 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 C done 690 2d19h 676d 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 1713d 1774d 0/29 auto-closed as invalid on 2022/09/18 21:51
upstream INFO: task hung in tun_chr_close net 1 5 2498d 3079d 0/29 closed as dup on 2018/02/16 08:24
linux-4.19 INFO: task hung in tun_chr_close (3) 1 1 1448d 1448d 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 727d 794d 0/3 auto-obsoleted due to no activity on 2024/10/04 23:47
upstream INFO: task hung in rtnetlink_rcv_msg net 1 C inconclusive inconclusive 1970 745d 2708d 26/29 fixed on 2024/07/09 19:14
android-49 INFO: task hung in tun_chr_close 1 1 2994d 2994d 0/3 auto-closed as invalid on 2019/02/22 14:33
linux-4.19 INFO: task hung in tun_chr_close (4) 1 3 1255d 1282d 0/1 upstream: reported on 2023/01/18 07:05
linux-4.19 INFO: task hung in tun_chr_close (2) 1 6 1661d 1755d 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 205d 205d 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 1885d 1885d 0/29 auto-closed as invalid on 2021/08/23 13:06
android-44 INFO: task hung in tun_chr_close 1 1 3003d 3003d 0/2 auto-closed as invalid on 2019/02/22 15:23
upstream INFO: task hung in tun_chr_close (2) net 1 7 1994d 2215d 0/29 auto-closed as invalid on 2021/05/17 11:47

Sample crash report:
request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module nf-nat-0, throttling...
request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module nf-nat-0, throttling...
request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module nf-nat-0, throttling...
request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module nf-nat-0, throttling...
INFO: task syz-executor.1:3421 blocked for more than 140 seconds.
      Not tainted 4.19.139-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D26064  3421   6586 0x80000002
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:1002 [inline]
 __mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
 tun_detach drivers/net/tun.c:751 [inline]
 tun_chr_close+0x3a/0x180 drivers/net/tun.c:3267
 __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+0xbb2/0x2b70 kernel/exit.c:887
 do_group_exit+0x125/0x310 kernel/exit.c:990
 get_signal+0x3f2/0x1f70 kernel/signal.c:2588
 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821
 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45ce69
Code: Bad RIP value.
RSP: 002b:00007fd2d7682c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 0000000000000080 RBX: 0000000000028580 RCX: 000000000045ce69
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000005
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffd0714fb9f R14: 00007fd2d76839c0 R15: 000000000118bf2c
INFO: task kworker/0:1:13693 blocked for more than 140 seconds.
      Not tainted 4.19.139-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:1     D29632 13693      2 0x80000000
Workqueue: ipv6_addrconf addrconf_verify_work
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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/08/11 18:54 linux-4.19.y c14d30dc9987 5d3ebca9 .config console log report ci2-linux-4-19
* Struck through repros no longer work on HEAD.