From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: ccaulfie@redhat.com, teigland@redhat.com
Cc: cluster-devel@redhat.com, linux-kernel <linux-kernel@vger.kernel.org>
Subject: [BUG] fs: dlm: possible ABBA deadlock
Date: Thu, 19 Aug 2021 16:54:57 +0800 [thread overview]
Message-ID: <79f8d302-f53f-3891-965a-bcb460ab15ca@gmail.com> (raw)
Hello,
My static analysis tool reports a possible ABBA deadlock in the dlm
filesystem in Linux 5.10:
dlm_recover_waiters_pre()
mutex_lock(&ls->ls_waiters_mutex); --> line 5130
recover_convert_waiter()
_receive_convert_reply()
lock_rsb()
mutex_lock(&r->res_mutex); --> line 69
dlm_recover_waiters_post()
lock_rsb()
mutex_lock(&r->res_mutex); --> line 69
mutex_lock(&ls->ls_waiters_mutex); --> line 5307
When dlm_recover_waiters_pre() and dlm_recover_waiters_post() are
concurrently executed, the deadlock can occur.
I am not quite sure whether this possible deadlock is real and how to
fix it if it is real.
Any feedback would be appreciated, thanks :)
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Best wishes,
Jia-Ju Bai
next reply other threads:[~2021-08-19 8:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-19 8:54 Jia-Ju Bai [this message]
2021-08-19 15:55 ` [BUG] fs: dlm: possible ABBA deadlock David Teigland
2021-08-20 8:16 ` Jia-Ju Bai
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