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* [Cluster-devel] [RHEL8 fs] gfs2: Fix missed wakeups in find_insert_glock
@ 2019-03-08 16:56 Andreas Gruenbacher
  2019-03-08 17:15 ` Andreas Gruenbacher
  0 siblings, 1 reply; 2+ messages in thread
From: Andreas Gruenbacher @ 2019-03-08 16:56 UTC (permalink / raw)
  To: cluster-devel.redhat.com

Bugzilla: 1678907
Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next
Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=20503365

commit 605b0487f0bc1ae9963bf52ece0f5c8055186f81
Author: Andreas Gruenbacher <agruenba@redhat.com>
Date:   Wed Mar 6 15:41:57 2019 +0100

    gfs2: Fix missed wakeups in find_insert_glock

    Mark Syms has reported seeing tasks that are stuck waiting in
    find_insert_glock.  It turns out that struct lm_lockname contains four padding
    bytes on 64-bit architectures that function glock_waitqueue doesn't skip when
    hashing the glock name.  As a result, we can end up waking up the wrong
    waitqueue, and the waiting tasks may be stuck forever.

    Fix that by using ht_parms.key_len instead of sizeof(struct lm_lockname) for
    the key length.

    Reported-by: Mark Syms <mark.syms@citrix.com>
    Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
    Signed-off-by: Bob Peterson <rpeterso@redhat.com>

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
 fs/gfs2/glock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 05431324b262b..57cdce53b64bd 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -107,7 +107,7 @@ static int glock_wake_function(wait_queue_entry_t *wait, unsigned int mode,
 
 static wait_queue_head_t *glock_waitqueue(struct lm_lockname *name)
 {
-	u32 hash = jhash2((u32 *)name, sizeof(*name) / 4, 0);
+	u32 hash = jhash2((u32 *)name, ht_parms.key_len / 4, 0);
 
 	return glock_wait_table + hash_32(hash, GLOCK_WAIT_TABLE_BITS);
 }
-- 
2.20.1



^ permalink raw reply related	[flat|nested] 2+ messages in thread

* [Cluster-devel] [RHEL8 fs] gfs2: Fix missed wakeups in find_insert_glock
  2019-03-08 16:56 [Cluster-devel] [RHEL8 fs] gfs2: Fix missed wakeups in find_insert_glock Andreas Gruenbacher
@ 2019-03-08 17:15 ` Andreas Gruenbacher
  0 siblings, 0 replies; 2+ messages in thread
From: Andreas Gruenbacher @ 2019-03-08 17:15 UTC (permalink / raw)
  To: cluster-devel.redhat.com

On Fri, 8 Mar 2019 at 17:56, Andreas Gruenbacher <agruenba@redhat.com> wrote:
>
> Bugzilla: 1678907
> Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next
> Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=20503365

Wrong mailing list, please disregard.

Thanks,
Andreas



^ permalink raw reply	[flat|nested] 2+ messages in thread

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2019-03-08 16:56 [Cluster-devel] [RHEL8 fs] gfs2: Fix missed wakeups in find_insert_glock Andreas Gruenbacher
2019-03-08 17:15 ` Andreas Gruenbacher

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