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MFV 286604: 5812 assertion failed in zrl_tryenter(): zr_owner==NULL

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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>
Author: Matthew Ahrens <mahrens@delphix.com>

illumos/illumos-gate@8df173054c
This commit is contained in:
Alexander Motin 2015-08-10 21:36:51 +00:00
parent 799f47828d
commit 1af86496cb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=286605
1 changed files with 14 additions and 13 deletions
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27
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zrlock.c
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@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014 by Delphix. All rights reserved.
*/
/*
@ -42,7 +43,7 @@
* 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
@ -60,7 +61,7 @@ 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;
@ -80,7 +81,7 @@ 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,
@ -98,7 +99,7 @@ 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;
@ -112,14 +113,14 @@ 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
@ -132,14 +133,14 @@ 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);
}
@ -147,11 +148,11 @@ 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
@ -163,7 +164,7 @@ zrl_exit(zrlock_t *zrl)
int
zrl_refcount(zrlock_t *zrl)
{
ASSERT(zrl->zr_refcount > ZRL_DESTROYED);
ASSERT3S(zrl->zr_refcount, >, ZRL_DESTROYED);
int n = (int)zrl->zr_refcount;
return (n <= 0 ? 0 : n);
@ -172,7 +173,7 @@ 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);
}
@ -180,7 +181,7 @@ 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);
}