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Illumos 5812 - assertion failed in zrl_tryenter(): zr_owner==NULL 

5812 assertion failed in zrl_tryenter(): zr_owner==NULL
Reviewed by: George Wilson <george@delphix.com>
Reviewed by: Alex Reece <alex@delphix.com>
Reviewed by: Will Andrews <will@freebsd.org>
Approved by: Gordon Ross <gwr@nexenta.com>

References:
  https://www.illumos.org/issues/5812
  https://github.com/illumos/illumos-gate/commit/8df1730

Ported-by: DHE <git@dehacked.net>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3357
This commit is contained in:
Matthew Ahrens 2015-04-26 15:29:43 -07:00 committed by Brian Behlendorf
parent 6186e29753
commit 8dd86a10cf
1 changed files with 14 additions and 13 deletions
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27
module/zfs/zrlock.c
View File

@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014 by Delphix. All rights reserved.
*/
/*
@ -43,7 +44,7 @@
* A ZRL can be locked only while there are zero references, so ZRL_LOCKED is
* treated as zero references.
*/
#define ZRL_LOCKED ((uint32_t)-1)
#define ZRL_LOCKED -1
#define ZRL_DESTROYED -2
void
@ -61,7 +62,7 @@ zrl_init(zrlock_t *zrl)
void
zrl_destroy(zrlock_t *zrl)
{
ASSERT(zrl->zr_refcount == 0);
ASSERT0(zrl->zr_refcount);
mutex_destroy(&zrl->zr_mtx);
zrl->zr_refcount = ZRL_DESTROYED;
@ -81,7 +82,7 @@ zrl_add(zrlock_t *zrl)
uint32_t cas = atomic_cas_32(
(uint32_t *)&zrl->zr_refcount, n, n + 1);
if (cas == n) {
ASSERT((int32_t)n >= 0);
ASSERT3S((int32_t)n, >=, 0);
#ifdef ZFS_DEBUG
if (zrl->zr_owner == curthread) {
DTRACE_PROBE2(zrlock__reentry,
@ -99,7 +100,7 @@ zrl_add(zrlock_t *zrl)
while (zrl->zr_refcount == ZRL_LOCKED) {
cv_wait(&zrl->zr_cv, &zrl->zr_mtx);
}
ASSERT(zrl->zr_refcount >= 0);
ASSERT3S(zrl->zr_refcount, >=, 0);
zrl->zr_refcount++;
#ifdef ZFS_DEBUG
zrl->zr_owner = curthread;
@ -113,14 +114,14 @@ zrl_remove(zrlock_t *zrl)
{
uint32_t n;
n = atomic_dec_32_nv((uint32_t *)&zrl->zr_refcount);
ASSERT((int32_t)n >= 0);
#ifdef ZFS_DEBUG
if (zrl->zr_owner == curthread) {
zrl->zr_owner = NULL;
zrl->zr_caller = NULL;
}
#endif
n = atomic_dec_32_nv((uint32_t *)&zrl->zr_refcount);
ASSERT3S((int32_t)n, >=, 0);
}
int
@ -133,14 +134,14 @@ zrl_tryenter(zrlock_t *zrl)
(uint32_t *)&zrl->zr_refcount, 0, ZRL_LOCKED);
if (cas == 0) {
#ifdef ZFS_DEBUG
ASSERT(zrl->zr_owner == NULL);
ASSERT3P(zrl->zr_owner, ==, NULL);
zrl->zr_owner = curthread;
#endif
return (1);
}
}
ASSERT((int32_t)n > ZRL_DESTROYED);
ASSERT3S((int32_t)n, >, ZRL_DESTROYED);
return (0);
}
@ -148,11 +149,11 @@ zrl_tryenter(zrlock_t *zrl)
void
zrl_exit(zrlock_t *zrl)
{
ASSERT(zrl->zr_refcount == ZRL_LOCKED);
ASSERT3S(zrl->zr_refcount, ==, ZRL_LOCKED);
mutex_enter(&zrl->zr_mtx);
#ifdef ZFS_DEBUG
ASSERT(zrl->zr_owner == curthread);
ASSERT3P(zrl->zr_owner, ==, curthread);
zrl->zr_owner = NULL;
membar_producer(); /* make sure the owner store happens first */
#endif
@ -166,7 +167,7 @@ zrl_refcount(zrlock_t *zrl)
{
int n;
ASSERT(zrl->zr_refcount > ZRL_DESTROYED);
ASSERT3S(zrl->zr_refcount, >, ZRL_DESTROYED);
n = (int)zrl->zr_refcount;
return (n <= 0 ? 0 : n);
@ -175,7 +176,7 @@ zrl_refcount(zrlock_t *zrl)
int
zrl_is_zero(zrlock_t *zrl)
{
ASSERT(zrl->zr_refcount > ZRL_DESTROYED);
ASSERT3S(zrl->zr_refcount, >, ZRL_DESTROYED);
return (zrl->zr_refcount <= 0);
}
@ -183,7 +184,7 @@ zrl_is_zero(zrlock_t *zrl)
int
zrl_is_locked(zrlock_t *zrl)
{
ASSERT(zrl->zr_refcount > ZRL_DESTROYED);
ASSERT3S(zrl->zr_refcount, >, ZRL_DESTROYED);
return (zrl->zr_refcount == ZRL_LOCKED);
}