linux-kernel - [BUG] scsi/libfc: Sleep-in-atomic bugs in libfc

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Message-ID: <aa6f7a10-0be3-0178-cba7-a3a03a5b1191@163.com>
Date:   Tue, 3 Oct 2017 11:08:24 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     jth@...nel.org, jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com
Cc:     fcoe-devel@...n-fcoe.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [BUG] scsi/libfc: Sleep-in-atomic bugs in libfc

According to fc_disc.c, the driver may sleep under a RCU lock,
and the function call paths are:
fc_disc_done (acquire the RCU lock)
   fc_rport_logoff
     mutex_lock --> may sleep

fc_disc_done (acquire the RCU lock)
   fc_rport_login
     mutex_lock --> may sleep

fc_disc_stop_rports
   fc_rport_logoff
     mutex_lock --> may sleep

These bugs are found by my static analysis tool and my code review.

Thanks,
Jia-Ju Bai