INFO: task hung in ip6gre_exit_batch_net

Status: auto-obsoleted due to no activity on 2024/09/16 14:37
Reported-by: syzbot+75548abafc059665ea3f@syzkaller.appspotmail.com
First crash: 781d, last: 781d
▶ ▼ Similar bugs (12)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in ip6gre_exit_batch_net (6) net 1 1 1112d 1112d 0/29 closed as invalid on 2023/09/07 14:36
upstream INFO: task hung in ip6gre_exit_batch_net (2) net 1 3 2445d 2445d 0/29 auto-closed as invalid on 2020/01/17 16:16
linux-5.15 INFO: task hung in ip6gre_exit_batch_net (2) origin:upstream 1 syz error 1 247d 247d 0/3 upstream: reported syz repro on 2025/11/24 02:32
linux-6.1 INFO: task hung in ip6gre_exit_batch_net (2) origin:lts-only 1 syz, C done 1 75d 75d 3/3 fixed on 2026/06/16 10:34
linux-4.19 INFO: task hung in ip6gre_exit_batch_net (2) 1 1 2060d 2060d 0/1 auto-closed as invalid on 2021/04/06 21:09
linux-4.19 INFO: task hung in ip6gre_exit_batch_net (3) 1 7 1658d 1825d 0/1 auto-closed as invalid on 2022/05/13 06:16
upstream INFO: task hung in ip6gre_exit_batch_net (4) net 1 syz unreliable 44 1713d 1764d 0/29 closed as invalid on 2021/12/14 20:12
upstream INFO: task hung in ip6gre_exit_batch_net net 1 6 2484d 2977d 0/29 closed as dup on 2018/06/04 15:23
linux-5.15 INFO: task hung in ip6gre_exit_batch_net 1 4 781d 798d 0/3 auto-obsoleted due to no activity on 2024/09/16 15:09
upstream INFO: task hung in ip6gre_exit_batch_net (5) net 1 1 1490d 1490d 0/29 auto-closed as invalid on 2022/09/28 06:40
linux-4.19 INFO: task hung in ip6gre_exit_batch_net 1 1 2462d 2462d 0/1 auto-closed as invalid on 2020/02/29 06:17
upstream INFO: task hung in ip6gre_exit_batch_net (3) net 1 18 1948d 2263d 0/29 auto-closed as invalid on 2021/06/27 10:57

Sample crash report:
INFO: task kworker/u4:0:9 blocked for more than 143 seconds.
      Not tainted 6.1.92-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:0    state:D stack:22368 pid:9     ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x142d/0x4550 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 ip6gre_exit_batch_net+0xc0/0x460 net/ipv6/ip6_gre.c:1666
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x763/0xb60 net/core/net_namespace.c:604
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: task kworker/1:3:1170 blocked for more than 143 seconds.
      Not tainted 6.1.92-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:3     state:D stack:23872 pid:1170  ppid:2      flags:0x00004000
Workqueue: events request_firmware_work_func
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x142d/0x4550 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 regdb_fw_cb+0x7e/0x1b0 net/wireless/reg.c:1053
 request_firmware_work_func+0x199/0x270 drivers/base/firmware_loader/main.c:1107
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: task dhcpcd:3217 blocked for more than 143 seconds.
      Not tainted 6.1.92-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:20280 pid:3217  ppid:3216   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x142d/0x45 kernel/sched/core.c:6558

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/08 14:37 linux-6.1.y 88690811da69 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ip6gre_exit_batch_net
* Struck through repros no longer work on HEAD.