Messages in this thread | | | Subject | Re: [PATCH][v3.2 stable tree] dcache: Balance rcu_read_lock in have_submounts() | From | Ben Hutchings <> | Date | Mon, 16 Feb 2015 00:03:17 +0000 |
| |
On Thu, 2015-02-12 at 00:28 -0500, Steven Rostedt wrote: > On Wed, 11 Feb 2015 03:15:37 +0000 > Ben Hutchings <ben@decadent.org.uk> wrote: > > > I've reviewed locking contexts in all three functions that I changed > > when backporting "deal with deadlock in d_walk()". It's actually worse > > than you say: > > > > - We don't hold this_parent->d_lock at the 'positive' label in > > have_submounts(), but it is unlocked after 'rename_retry'. > > - There is an rcu_read_unlock() after the 'out' label in > > select_parent(), but it's not held at the 'goto out'. > > > > Does the following patch work for you? > > I booted the original 3.2 kernel 3 times and it succeeded once, and > crashed the other two. > > I applied this patch and booted it 5 times, and it succeeded every time. > > I removed the patch, and it crashed on the very next boot. > > Thus, I'd say it seems to have fixed the issue for me. > > Tested-by: Steven Rostedt <rostedt@goodmis.org> [...]
Thanks.
Ben.
-- Ben Hutchings Never attribute to conspiracy what can adequately be explained by stupidity. [unhandled content-type:application/pgp-signature] | |