diff options
| author | Chris Leech <cleech@redhat.com> | 2017-02-27 16:58:36 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-26 13:05:58 +0200 |
| commit | de1ff848c74fcc5b172323c1d5fac88dc1ab0281 (patch) | |
| tree | da66d445034267e0ca8f5937264bd4cf7b7016d2 /include | |
| parent | 42ba2c265b085a83a3b18ddb6e087f231c97e02e (diff) | |
scsi: libiscsi: add lock around task lists to fix list corruption regression
commit 6f8830f5bbab16e54f261de187f3df4644a5b977 upstream.
There's a rather long standing regression from the commit "libiscsi:
Reduce locking contention in fast path"
Depending on iSCSI target behavior, it's possible to hit the case in
iscsi_complete_task where the task is still on a pending list
(!list_empty(&task->running)). When that happens the task is removed
from the list while holding the session back_lock, but other task list
modification occur under the frwd_lock. That leads to linked list
corruption and eventually a panicked system.
Rather than back out the session lock split entirely, in order to try
and keep some of the performance gains this patch adds another lock to
maintain the task lists integrity.
Major enterprise supported kernels have been backing out the lock split
for while now, thanks to the efforts at IBM where a lab setup has the
most reliable reproducer I've seen on this issue. This patch has been
tested there successfully.
Signed-off-by: Chris Leech <cleech@redhat.com>
Fixes: 659743b02c41 ("[SCSI] libiscsi: Reduce locking contention in fast path")
Reported-by: Prashantha Subbarao <psubbara@us.ibm.com>
Reviewed-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/scsi/libiscsi.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h index 4d1c46aac331..c7b1dc713cdd 100644 --- a/include/scsi/libiscsi.h +++ b/include/scsi/libiscsi.h @@ -196,6 +196,7 @@ struct iscsi_conn { struct iscsi_task *task; /* xmit task in progress */ /* xmit */ + spinlock_t taskqueuelock; /* protects the next three lists */ struct list_head mgmtqueue; /* mgmt (control) xmit queue */ struct list_head cmdqueue; /* data-path cmd queue */ struct list_head requeue; /* tasks needing another run */ |