From: Arun Easi aeasi@marvell.com
commit e6e22e6cc2962d3f3d71914b47f7fbc454670e8a upstream.
System crash was seen when I/O was run against an NVMe target and aborts were occurring.
Crash stack is:
-- relevant crash stack -- BUG: kernel NULL pointer dereference, address: 0000000000000010 : #6 [ffffae1f8666bdd0] page_fault at ffffffffa740122e [exception RIP: qla_nvme_abort_work+339] RIP: ffffffffc0f592e3 RSP: ffffae1f8666be80 RFLAGS: 00010297 RAX: 0000000000000000 RBX: ffff9b581fc8af80 RCX: ffffffffc0f83bd0 RDX: 0000000000000001 RSI: ffff9b5839c6c7c8 RDI: 0000000008000000 RBP: ffff9b6832f85000 R8: ffffffffc0f68160 R9: ffffffffc0f70652 R10: ffffae1f862ffdc8 R11: 0000000000000300 R12: 000000000000010d R13: 0000000000000000 R14: ffff9b5839cea000 R15: 0ffff9b583fab170 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #7 [ffffae1f8666be98] process_one_work at ffffffffa6aba184 #8 [ffffae1f8666bed8] worker_thread at ffffffffa6aba39d #9 [ffffae1f8666bf10] kthread at ffffffffa6ac06ed
The crash was due to a stale SRB structure access after it was aborted. Fix the issue by removing stale access.
Link: https://lore.kernel.org/r/20210908164622.19240-5-njavali@marvell.com Fixes: 2cabf10dbbe3 ("scsi: qla2xxx: Fix hang on NVMe command timeouts") Cc: stable@vger.kernel.org Reviewed-by: Himanshu Madhani himanshu.madhani@oracle.com Signed-off-by: Arun Easi aeasi@marvell.com Signed-off-by: Nilesh Javali njavali@marvell.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/scsi/qla2xxx/qla_nvme.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)
--- a/drivers/scsi/qla2xxx/qla_nvme.c +++ b/drivers/scsi/qla2xxx/qla_nvme.c @@ -228,6 +228,8 @@ static void qla_nvme_abort_work(struct w fc_port_t *fcport = sp->fcport; struct qla_hw_data *ha = fcport->vha->hw; int rval, abts_done_called = 1; + bool io_wait_for_abort_done; + uint32_t handle;
ql_dbg(ql_dbg_io, fcport->vha, 0xffff, "%s called for sp=%p, hndl=%x on fcport=%p desc=%p deleted=%d\n", @@ -244,12 +246,20 @@ static void qla_nvme_abort_work(struct w goto out; }
+ /* + * sp may not be valid after abort_command if return code is either + * SUCCESS or ERR_FROM_FW codes, so cache the value here. + */ + io_wait_for_abort_done = ql2xabts_wait_nvme && + QLA_ABTS_WAIT_ENABLED(sp); + handle = sp->handle; + rval = ha->isp_ops->abort_command(sp);
ql_dbg(ql_dbg_io, fcport->vha, 0x212b, "%s: %s command for sp=%p, handle=%x on fcport=%p rval=%x\n", __func__, (rval != QLA_SUCCESS) ? "Failed to abort" : "Aborted", - sp, sp->handle, fcport, rval); + sp, handle, fcport, rval);
/* * If async tmf is enabled, the abort callback is called only on @@ -264,7 +274,7 @@ static void qla_nvme_abort_work(struct w * are waited until ABTS complete. This kref is decreased * at qla24xx_abort_sp_done function. */ - if (abts_done_called && ql2xabts_wait_nvme && QLA_ABTS_WAIT_ENABLED(sp)) + if (abts_done_called && io_wait_for_abort_done) return; out: /* kref_get was done before work was schedule. */