From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: qla2xxx-upstream@qlogic.com, jejb@linux.vnet.ibm.com,
martin.petersen@oracle.com
Cc: linux-scsi@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [BUG] scsi/qla2xxx: a possible sleep-in-atomic bug in qlt_get_tag
Date: Wed, 13 Dec 2017 11:18:07 +0800 [thread overview]
Message-ID: <0363371c-db1c-169f-df5f-ca15b3839e41@gmail.com> (raw)
The driver may sleep under a spinlock.
The function call paths are:
qlt_handle_abts_recv_work (acquire the spinlock)
qlt_response_pkt_all_vps
qlt_response_pkt
qlt_handle_cmd_for_atio
qlt_get_tag
percpu_ida_alloc --> may sleep
qla82xx_msix_rsp_q (acquire the spinlock)
qla24xx_process_response_queue
qlt_handle_abts_recv
qlt_response_pkt_all_vps
qlt_response_pkt
qlt_handle_cmd_for_atio
qlt_get_tag
percpu_ida_alloc --> may sleep-in-atomic
qla24xx_intr_handler (acquire the spinlock)
qla24xx_process_response_queue
qlt_handle_abts_recv
qlt_response_pkt
qlt_handle_cmd_for_atio
qlt_get_tag
percpu_ida_alloc --> may sleep
I do not find a good way to fix it, so I only report.
This possible bug is found by my static analysis tool (DSAC) and checked
by my code review.
Thanks,
Jia-Ju Bai
next reply other threads:[~2017-12-13 3:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-13 3:18 Jia-Ju Bai [this message]
2017-12-13 4:42 ` [BUG] scsi/qla2xxx: a possible sleep-in-atomic bug in qlt_get_tag James Bottomley
2017-12-13 7:38 ` Jia-Ju Bai
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