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Race condition between spa async threads and export

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In the past we've seen multiple race conditions that have
to do with open-context threads async threads and concurrent
calls to spa_export()/spa_destroy() (including the one
referenced in issue #9015).

This patch ensures that only one thread can execute the
main body of spa_export_common() at a time, with subsequent
threads returning with a new error code created just for
this situation, eliminating this way any race condition
bugs introduced by concurrent calls to this function.

Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Closes #9015 
Closes #9044
This commit is contained in:
Serapheim Dimitropoulos
2019-07-18 13:02:33 -07:00
committed by Brian Behlendorf
parent 1c44a5c97f
commit 43a8536260
6 changed files with 42 additions and 2 deletions
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cmd/ztest/ztest.c
+17 -1
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@@ -2719,8 +2719,24 @@ ztest_spa_create_destroy(ztest_ds_t *zd, uint64_t id)
VERIFY3U(EEXIST, ==,
spa_create(zo->zo_pool, nvroot, NULL, NULL, NULL));
nvlist_free(nvroot);
/*
* We open a reference to the spa and then we try to export it
* expecting one of the following errors:
*
* EBUSY
* Because of the reference we just opened.
*
* ZFS_ERR_EXPORT_IN_PROGRESS
* For the case that there is another ztest thread doing
* an export concurrently.
*/
VERIFY3U(0, ==, spa_open(zo->zo_pool, &spa, FTAG));
VERIFY3U(EBUSY, ==, spa_destroy(zo->zo_pool));
int error = spa_destroy(zo->zo_pool);
if (error != EBUSY && error != ZFS_ERR_EXPORT_IN_PROGRESS) {
fatal(0, "spa_destroy(%s) returned unexpected value %d",
spa->spa_name, error);
}
spa_close(spa, FTAG);
(void) pthread_rwlock_unlock(&ztest_name_lock);