Red Hat Bugzilla – Bug 247879
dm-mirror: spinlock in write_callback has the potential for deadlock
Last modified: 2008-07-24 15:13:44 EDT
+++ This bug was initially created as a clone of Bug #247877 +++
write_callback is in dm-raid1.c is called when an I/O completes. It calls
spin_lock(&ms->lock). Since write_callback could be called from either process
or interrupt context, we need to use spin_lock_irqsave().
This becomes especially important when we want to layer dm-targets that might
call bio_endio from process context.
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release. Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update
since the patch was posted after 4.6 kernel freeze, this patch requires
justfication to bring into 4.6 after the deadline. Please provide bussiness
or technical justification and set either blocker or exception flag below to "?"
for 4.6 consideration.
okay.. move to 4.7. please provide bus./tech. justification for
4.6 inclusion if need to.
Committed in 68.8
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.