* [Qemu-devel] [PATCH] block/iscsi: fix deadlock on scsi check condition
@ 2014-02-18 12:08 Peter Lieven
2014-02-18 12:40 ` Paolo Bonzini
0 siblings, 1 reply; 2+ messages in thread
From: Peter Lieven @ 2014-02-18 12:08 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, peter.maydell, stefanha, Peter Lieven, qemu-stable,
ronniesahlberg, pbonzini
the retry logic was broken because the complete status
of the task structure was not reset. this resulted in
an infinite loop retrying the command over and over.
CC: qemu-stable@nongnu.org
Signed-off-by: Peter Lieven <pl@kamp.de>
---
block/iscsi.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/block/iscsi.c b/block/iscsi.c
index 3c0b728..ded414e 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -145,12 +145,13 @@ iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
if (iTask->retries-- > 0 && status == SCSI_STATUS_CHECK_CONDITION
&& task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
+ error_report("iSCSI CheckCondition: %s", iscsi_get_error(iscsi));
iTask->do_retry = 1;
goto out;
}
if (status != SCSI_STATUS_GOOD) {
- error_report("iSCSI: Failure. %s", iscsi_get_error(iscsi));
+ error_report("iSCSI Failure: %s", iscsi_get_error(iscsi));
}
out:
@@ -325,6 +326,7 @@ retry:
}
if (iTask.do_retry) {
+ iTask.complete = 0;
goto retry;
}
@@ -399,6 +401,7 @@ retry:
}
if (iTask.do_retry) {
+ iTask.complete = 0;
goto retry;
}
@@ -433,6 +436,7 @@ retry:
}
if (iTask.do_retry) {
+ iTask.complete = 0;
goto retry;
}
@@ -683,6 +687,7 @@ retry:
scsi_free_scsi_task(iTask.task);
iTask.task = NULL;
}
+ iTask.complete = 0;
goto retry;
}
@@ -767,6 +772,7 @@ retry:
}
if (iTask.do_retry) {
+ iTask.complete = 0;
goto retry;
}
@@ -836,6 +842,7 @@ retry:
}
if (iTask.do_retry) {
+ iTask.complete = 0;
goto retry;
}
--
1.7.9.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] [PATCH] block/iscsi: fix deadlock on scsi check condition
2014-02-18 12:08 [Qemu-devel] [PATCH] block/iscsi: fix deadlock on scsi check condition Peter Lieven
@ 2014-02-18 12:40 ` Paolo Bonzini
0 siblings, 0 replies; 2+ messages in thread
From: Paolo Bonzini @ 2014-02-18 12:40 UTC (permalink / raw)
To: Peter Lieven, qemu-devel
Cc: kwolf, peter.maydell, ronniesahlberg, stefanha, qemu-stable
Il 18/02/2014 13:08, Peter Lieven ha scritto:
> the retry logic was broken because the complete status
> of the task structure was not reset. this resulted in
> an infinite loop retrying the command over and over.
>
> CC: qemu-stable@nongnu.org
> Signed-off-by: Peter Lieven <pl@kamp.de>
> ---
> block/iscsi.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/block/iscsi.c b/block/iscsi.c
> index 3c0b728..ded414e 100644
> --- a/block/iscsi.c
> +++ b/block/iscsi.c
> @@ -145,12 +145,13 @@ iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
>
> if (iTask->retries-- > 0 && status == SCSI_STATUS_CHECK_CONDITION
> && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
> + error_report("iSCSI CheckCondition: %s", iscsi_get_error(iscsi));
> iTask->do_retry = 1;
> goto out;
> }
>
> if (status != SCSI_STATUS_GOOD) {
> - error_report("iSCSI: Failure. %s", iscsi_get_error(iscsi));
> + error_report("iSCSI Failure: %s", iscsi_get_error(iscsi));
> }
>
> out:
> @@ -325,6 +326,7 @@ retry:
> }
>
> if (iTask.do_retry) {
> + iTask.complete = 0;
> goto retry;
> }
>
> @@ -399,6 +401,7 @@ retry:
> }
>
> if (iTask.do_retry) {
> + iTask.complete = 0;
> goto retry;
> }
>
> @@ -433,6 +436,7 @@ retry:
> }
>
> if (iTask.do_retry) {
> + iTask.complete = 0;
> goto retry;
> }
>
> @@ -683,6 +687,7 @@ retry:
> scsi_free_scsi_task(iTask.task);
> iTask.task = NULL;
> }
> + iTask.complete = 0;
> goto retry;
> }
>
> @@ -767,6 +772,7 @@ retry:
> }
>
> if (iTask.do_retry) {
> + iTask.complete = 0;
> goto retry;
> }
>
> @@ -836,6 +842,7 @@ retry:
> }
>
> if (iTask.do_retry) {
> + iTask.complete = 0;
> goto retry;
> }
>
>
Applied to scsi-next, thanks.
Paolo
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