path: root/MAINTAINERS
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authorXin Long <>2021-05-17 02:28:58 +0800
committerDavid S. Miller <>2021-05-17 14:07:48 -0700
commit04c26faa51d1e2fe71cf13c45791f5174c37f986 (patch)
tree45ba53c872e4ed678b25418d0c509f72b25c9a5c /MAINTAINERS
parent020ef930b826d21c5446fdc9db80fd72a791bc21 (diff)
tipc: wait and exit until all work queues are done
On some host, a crash could be triggered simply by repeating these commands several times: # modprobe tipc # tipc bearer enable media udp name UDP1 localip # rmmod tipc [] BUG: unable to handle kernel paging request at ffffffffc096bb00 [] Workqueue: events 0xffffffffc096bb00 [] Call Trace: [] ? process_one_work+0x1a7/0x360 [] ? worker_thread+0x30/0x390 [] ? create_worker+0x1a0/0x1a0 [] ? kthread+0x116/0x130 [] ? kthread_flush_work_fn+0x10/0x10 [] ? ret_from_fork+0x35/0x40 When removing the TIPC module, the UDP tunnel sock will be delayed to release in a work queue as sock_release() can't be done in rtnl_lock(). If the work queue is schedule to run after the TIPC module is removed, kernel will crash as the work queue function cleanup_beareri() code no longer exists when trying to invoke it. To fix it, this patch introduce a member wq_count in tipc_net to track the numbers of work queues in schedule, and wait and exit until all work queues are done in tipc_exit_net(). Fixes: d0f91938bede ("tipc: add ip/udp media type") Reported-by: Shuang Li <> Signed-off-by: Xin Long <> Acked-by: Jon Maloy <> Signed-off-by: David S. Miller <>
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