linux-kernel - [BUG] fs/dlm: A possible sleep-in-atomic bug in dlm_master

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Date:   Sat, 7 Oct 2017 09:59:41 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     ccaulfie@...hat.com, teigland@...hat.com, viro@...iv.linux.org.uk
Cc:     cluster-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: [BUG] fs/dlm: A possible sleep-in-atomic bug in dlm_master_lookup

According to fs/dlm/lock.c, the kernel may sleep under a spinlock,
and the function call path is:
dlm_master_lookup (acquire the spinlock)
   dlm_send_rcom_lookup_dump
     create_rcom
       dlm_lowcomms_get_buffer
         nodeid2con
           mutex_lock --> may sleep

This bug is found by my static analysis tool and my code review.

Thanks,
Jia-Ju Bai