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INFO: task hung in tun_chr_close (5)

Status: upstream: reported syz repro on 2024/09/15 19:59
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+b0ae8f1abf7d891e0426@syzkaller.appspotmail.com
First crash: 288d, last: 1d15h
Cause bisection: introduced by (bisect log) :
commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22
Author: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Date: Sat Sep 29 00:59:43 2018 +0000

  tc: Add support for configuring the taprio scheduler

Crash: BUG: unable to handle kernel NULL pointer dereference in taprio_dequeue (log)
Repro: syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [wireguard?] INFO: task hung in tun_chr_close (5) 0 (3) 2025/01/05 15:45
▶ ▼ Similar bugs (13)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: task hung in tun_chr_close 40 161d 403d 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 1718d 1718d 0/1 auto-closed as invalid on 2020/12/09 18:55
upstream INFO: task hung in tun_chr_close (4) net syz unreliable error 14 1259d 1320d 0/28 auto-closed as invalid on 2022/09/18 21:51
upstream INFO: task hung in tun_chr_close net 5 2044d 2625d 0/28 closed as dup on 2018/02/16 08:24
linux-4.19 INFO: task hung in tun_chr_close (3) 1 994d 994d 0/1 auto-obsoleted due to no activity on 2022/12/03 04:48
linux-6.1 INFO: task hung in tun_chr_close 31 273d 340d 0/3 auto-obsoleted due to no activity on 2024/10/04 23:47
upstream INFO: task hung in rtnetlink_rcv_msg net C inconclusive inconclusive 1970 290d 2254d 26/28 fixed on 2024/07/09 19:14
android-49 INFO: task hung in tun_chr_close 1 2540d 2540d 0/3 auto-closed as invalid on 2019/02/22 14:33
linux-4.19 INFO: task hung in tun_chr_close (4) 3 801d 828d 0/1 upstream: reported on 2023/01/18 07:05
linux-4.19 INFO: task hung in tun_chr_close (2) 6 1207d 1301d 0/1 auto-closed as invalid on 2022/05/04 09:03
upstream INFO: task hung in tun_chr_close (3) net 1 1431d 1431d 0/28 auto-closed as invalid on 2021/08/23 13:06
android-44 INFO: task hung in tun_chr_close 1 2549d 2549d 0/2 auto-closed as invalid on 2019/02/22 15:23
upstream INFO: task hung in tun_chr_close (2) net 7 1540d 1761d 0/28 auto-closed as invalid on 2021/05/17 11:47
▶ ▼ Last patch testing requests (4)
Created Duration User Patch Repo Result
2025/04/18 23:22 20m retest repro net report log
2025/04/04 10:07 17m retest repro upstream report log
2025/04/04 10:07 20m retest repro upstream report log
2025/04/04 10:07 19m retest repro upstream report log

Sample crash report:
INFO: task syz-executor:5453 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc5-syzkaller-00218-g2a520073e74f #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:20592 pid:5453  tgid:5453  ppid:1      task_flags:0x40054c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x190e/0x4c90 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6857
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
 __mutex_lock_common kernel/locking/mutex.c:662 [inline]
 __mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
 tun_detach drivers/net/tun.c:698 [inline]
 tun_chr_close+0x3b/0x1b0 drivers/net/tun.c:3517
 __fput+0x3e9/0x9f0 fs/file_table.c:464
 task_work_run+0x24f/0x310 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xa2a/0x28e0 kernel/exit.c:938
 do_group_exit+0x207/0x2c0 kernel/exit.c:1087
 get_signal+0x168c/0x1720 kernel/signal.c:3036
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f76d178f05a
RSP: 002b:00007ffc45853948 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: 0000000000000000 RBX: 00007ffc458539d0 RCX: 00007f76d178f05a
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00000000000002d8 R09: 0079746972756365
R10: 00007f76d197b9a0 R11: 0000000000000206 R12: 00007f76d197b940
R13: 00007ffc4585396c R14: 0000000000000000 R15: 00007f76d197c000
 </TASK>
INFO: task syz-executor:5456 blocked for more than 150 seconds.
      Not tainted 6.14.0-rc5-syzkaller-00218-g2a520073e74f #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:20000 pid:5456  tgid:5456  ppid:1      task_flags:0x40054c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x190e/0x4c90 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6857
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
 __mutex_lock_common kernel/locking/mutex.c:662 [inline]
 __mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
 tun_detach drivers/net/tun.c:698 [inline]
 tun_chr_close+0x3b/0x1b0 drivers/net/tun.c:3517
 __fput+0x3e9/0x9f0 fs/file_table.c:464
 task_work_run+0x24f/0x310 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xa2a/0x28e0 kernel/exit.c:938

Crashes (581):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/08 21:35 upstream 2a520073e74f 7e3bd60d .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in tun_chr_close
2025/03/08 19:03 upstream 2a520073e74f 7e3bd60d .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in tun_chr_close
2024/11/19 01:31 upstream 9fb2cfa4635a 571351cb .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in tun_chr_close
2024/12/17 17:58 net 7ed2d9158877 c8c15bb2 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/04/24 11:24 upstream a79be02bba5c 9c80ffa0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in tun_chr_close
2025/04/21 21:00 upstream 9d7a0577c9db 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in tun_chr_close
2025/04/04 19:40 upstream e48e99b6edf4 1c4febdb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in tun_chr_close
2025/03/10 06:00 upstream 80e54e84911a 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in tun_chr_close
2025/03/09 06:08 upstream 2a520073e74f 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in tun_chr_close
2025/02/25 22:52 upstream 2a1944bff549 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in tun_chr_close
2025/02/06 08:16 upstream 92514ef226f5 577d049b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in tun_chr_close
2025/01/19 16:50 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in tun_chr_close
2025/01/19 10:09 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in tun_chr_close
2025/01/13 12:54 upstream 5bc55a333a2f 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in tun_chr_close
2025/01/11 02:10 upstream e0daef7de1ac 67d7ec0a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in tun_chr_close
2025/01/06 08:12 upstream ab75170520d4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in tun_chr_close
2025/01/04 01:11 upstream 0bc21e701a6f f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in tun_chr_close
2025/01/02 03:50 upstream 56e6a3499e14 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in tun_chr_close
2025/01/01 14:18 upstream ccb98ccef0e5 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in tun_chr_close
2024/12/31 07:40 upstream ccb98ccef0e5 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in tun_chr_close
2024/12/16 23:47 upstream 78d4f34e2115 f93b2b55 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in tun_chr_close
2024/12/13 22:10 upstream f932fb9b4074 7cbfbb3a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in tun_chr_close
2024/09/11 19:42 upstream 7c6a3a65ace7 9326a104 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in tun_chr_close
2024/09/01 23:27 upstream c9f016e72b5c 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in tun_chr_close
2024/10/17 00:04 upstream c964ced77262 666f77ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: task hung in tun_chr_close
2025/03/17 01:47 net 4003c9e78778 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/03/14 06:33 net 2409fa66e29a e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/03/12 15:14 net d2b9d97e89c7 ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/03/11 21:53 net 77b2ab31fc65 f2eee6b3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/03/05 01:39 net 3c6a041b317a c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/02/25 18:12 net bc50682128bd d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/02/24 08:44 net 28b04731a38c d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/02/16 19:49 net 071ed42cff4f 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/02/16 09:18 net 071ed42cff4f 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/02/07 13:18 net 1438f5d07b9a a4f327c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/02/06 01:48 net a1300691aed9 577d049b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/02/03 12:51 net 235174b2bed8 a21a8419 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/01/29 23:44 net 9e6c4e6b605c afe4eff5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/01/28 05:39 net 05d91cdb1f91 18070896 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/01/28 00:13 net 05d91cdb1f91 18070896 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/01/25 14:29 net 15a901361ec3 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2024/12/12 03:59 net 3dd002f20098 ff949d25 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in tun_chr_close
2025/03/21 07:35 net-next 6f13bec53a48 62330552 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2025/03/21 05:32 net-next 6f13bec53a48 62330552 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2025/03/15 09:40 net-next bfc6c67ec2d6 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2025/03/10 10:12 net-next 8ef890df4031 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2025/03/03 11:00 net-next f77f12010f67 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2025/02/27 14:00 net-next 0493f7a54e5b 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2025/02/21 10:58 net-next 5d6ba5ab8582 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2025/02/11 10:18 net-next 907dd32b4a8a 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2025/02/09 13:50 net-next acdefab0dcbc ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2025/01/27 11:08 net-next 0ad9617c78ac 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2024/12/21 23:14 net-next ae418e95dd93 d7f584ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2024/12/12 23:48 net-next 96b6fcc0ee41 941924eb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in tun_chr_close
2024/10/14 19:39 linux-next 7f773fd61baa 084d8178 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in tun_chr_close
* Struck through repros no longer work on HEAD.