linux-kernel - [PATCH v3 0/4] qla2xxx: A couple crash fixes

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Message-Id: <20200908081516.8561-1-dwagner@suse.de>
Date:   Tue,  8 Sep 2020 10:15:12 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     linux-scsi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Nilesh Javali <njavali@...vell.com>,
        Martin Wilck <mwilck@...e.com>, Arun Easi <aeasi@...vell.com>,
        Daniel Wagner <dwagner@...e.de>
Subject: [PATCH v3 0/4] qla2xxx: A couple crash fixes

The first crash we observed is due memory corruption in the srb memory
pool. Unforuntatly, I couldn't find the source of the problem but the
workaround by resetting the cleanup callbacks 'fixes' this problem
(patch #1). I think as intermeditate step this should be merged until
the real cause can be identified.

The second crash is due a race condition(?) in the firmware. The sts
entries are not updated in time which leads to this crash pattern
which several customers have reported:

 #0 [c00000ffffd1bb80] scsi_dma_unmap at d00000001e4904d4 [scsi_mod]
 #1 [c00000ffffd1bbe0] qla2x00_sp_compl at d0000000204803cc [qla2xxx]
 #2 [c00000ffffd1bc20] qla24xx_process_response_queue at d0000000204c5810 [qla2xxx]
 #3 [c00000ffffd1bd50] qla24xx_msix_rsp_q at d0000000204c8fd8 [qla2xxx]
 #4 [c00000ffffd1bde0] __handle_irq_event_percpu at c000000000189510
 #5 [c00000ffffd1bea0] handle_irq_event_percpu at c00000000018978c
 #6 [c00000ffffd1bee0] handle_irq_event at c00000000018984c
 #7 [c00000ffffd1bf10] handle_fasteoi_irq at c00000000018efc0
 #8 [c00000ffffd1bf40] generic_handle_irq at c000000000187f10
 #9 [c00000ffffd1bf60] __do_irq at c000000000018784
 #10 [c00000ffffd1bf90] call_do_irq at c00000000002caa4
 #11 [c00000ecca417a00] do_IRQ at c000000000018970
 #12 [c00000ecca417a50] restore_check_irq_replay at c00000000000de98

>From analyzing the crash dump it was clear that
qla24xx_mbx_iocb_entry() calls sp->done (qla2x00_sp_compl) which
crashes because the response is not a mailbox entry, it is a status
entry. Patch #4 changes the process logic for mailbox commands so that
the sp is parsed before calling the correct proccess function.


changes since v1:
 - addressed review comments by Martin
   - patch#1: added dummy warn function
   - patch#4: added log entry

changes since v2:
 - added reviewed tags by Martin
 - addressed review comments by Arun
   - patch#1: add srb pointer to log message
   - patch#3: print calling func name in qla2x00_get_sp_from_handle()
   - patch#4: dropped comment, reset HBA


Daniel Wagner (4):
  qla2xxx: Warn if done() or free() are called on an already freed srb
  qla2xxx: Simplify return value logic in qla2x00_get_sp_from_handle()
  qla2xxx: Log calling function name in qla2x00_get_sp_from_handle()
  qla2xxx: Handle incorrect entry_type entries

 drivers/scsi/qla2xxx/qla_init.c   | 10 +++++++++
 drivers/scsi/qla2xxx/qla_inline.h |  5 +++++
 drivers/scsi/qla2xxx/qla_isr.c    | 47 ++++++++++++++++++++++++++++++---------
 3 files changed, 51 insertions(+), 11 deletions(-)

-- 
2.16.4