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Date: Tue, 4 Jan 2022 16:42:42 +0800 From: kvartet <xyru1999@...il.com> To: davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org, kuba@...nel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Cc: sunhao.th@...il.com Subject: INFO: task hung in sit_exit_batch_net Hello, When using Syzkaller to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: a7904a538933 Linux 5.16-rc6 git tree: upstream console output: https://paste.ubuntu.com/p/b8pTJKKYkB/plain/ kernel config: https://paste.ubuntu.com/p/FDDNHDxtwz/plain/ Sorry, I don't have a reproducer for this crash, hope the symbolized report can help. If you fix this issue, please add the following tag to the commit: Reported-by: Yiru Xu <xyru1999@...il.com> INFO: task kworker/u8:6:11437 blocked for more than 143 seconds. Not tainted 5.16.0-rc6 #9 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:6 state:D stack:26360 pid:11437 ppid: 2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: <TASK> context_switch kernel/sched/core.c:4972 [inline] __schedule+0xcd9/0x2530 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xc48/0x1610 kernel/locking/mutex.c:740 sit_exit_batch_net+0x88/0x770 net/ipv6/sit.c:1946 ops_exit_list.isra.0+0x103/0x150 net/core/net_namespace.c:171 cleanup_net+0x511/0xa90 net/core/net_namespace.c:593 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2298 worker_thread+0x90/0xed0 kernel/workqueue.c:2445 Best Regards, Yiru
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