INFO: task hung in ip6gre_exit_batch_net (3)

Status: auto-closed as invalid on 2022/05/13 06:16
Reported-by: syzbot+a56b712111440d952493@syzkaller.appspotmail.com
First crash: 1820d, last: 1653d
▶ ▼ 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 1107d 1107d 0/29 closed as invalid on 2023/09/07 14:36
upstream INFO: task hung in ip6gre_exit_batch_net (2) net 1 3 2440d 2440d 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 242d 242d 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 C done 1 70d 70d 3/3 fixed on 2026/06/16 10:34
linux-4.19 INFO: task hung in ip6gre_exit_batch_net (2) 1 1 2054d 2054d 0/1 auto-closed as invalid on 2021/04/06 21:09
upstream INFO: task hung in ip6gre_exit_batch_net (4) net 1 syz unreliable 44 1708d 1759d 0/29 closed as invalid on 2021/12/14 20:12
upstream INFO: task hung in ip6gre_exit_batch_net net 1 6 2479d 2972d 0/29 closed as dup on 2018/06/04 15:23
linux-5.15 INFO: task hung in ip6gre_exit_batch_net 1 4 776d 793d 0/3 auto-obsoleted due to no activity on 2024/09/16 15:09
linux-6.1 INFO: task hung in ip6gre_exit_batch_net 1 1 776d 776d 0/3 auto-obsoleted due to no activity on 2024/09/16 14:37
upstream INFO: task hung in ip6gre_exit_batch_net (5) net 1 1 1485d 1485d 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 2457d 2457d 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 1943d 2258d 0/29 auto-closed as invalid on 2021/06/27 10:57

Sample crash report:
ieee802154 phy1 wpan1: encryption failed: -22
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
INFO: task kworker/u4:6:8903 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:6    D26624  8903      2 0x80000000
Workqueue: netns cleanup_net
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:1016 [inline]
 __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078
 ip6gre_exit_batch_net+0x82/0x6c0 net/ipv6/ip6_gre.c:1632
 ops_exit_list+0xf9/0x150 net/core/net_namespace.c:156

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/01/13 06:16 linux-4.19.y 3f8a27f9e27b 44d1319a .config console log report info ci2-linux-4-19 INFO: task hung in ip6gre_exit_batch_net
2022/01/10 04:16 linux-4.19.y 3f8a27f9e27b 2ca0d385 .config console log report info ci2-linux-4-19 INFO: task hung in ip6gre_exit_batch_net
2022/01/09 16:17 linux-4.19.y 3f8a27f9e27b 2ca0d385 .config console log report info ci2-linux-4-19 INFO: task hung in ip6gre_exit_batch_net
2021/12/22 02:43 linux-4.19.y 3f8a27f9e27b 6caa12e4 .config console log report info ci2-linux-4-19 INFO: task hung in ip6gre_exit_batch_net
2021/12/21 20:54 linux-4.19.y 3f8a27f9e27b 6caa12e4 .config console log report info ci2-linux-4-19 INFO: task hung in ip6gre_exit_batch_net
2021/09/01 23:12 linux-4.19.y e23d55af0e1f 7eb7e152 .config console log report info ci2-linux-4-19 INFO: task hung in ip6gre_exit_batch_net
2021/07/30 05:51 linux-4.19.y a89b48fe9308 c585c7b0 .config console log report info ci2-linux-4-19 INFO: task hung in ip6gre_exit_batch_net
* Struck through repros no longer work on HEAD.