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There is a lock order inversion deadlock between `spa_errlog_lock` and `dp_config_rwlock`: A thread in `spa_delete_dataset_errlog()` is running from a sync task. It is holding the `dp_config_rwlock` for writer (see `dsl_sync_task_sync()`), and waiting for the `spa_errlog_lock`. A thread in `dsl_pool_config_enter()` is holding the `spa_errlog_lock` (see `spa_get_errlog_size()`) and waiting for the `dp_config_rwlock` (as reader). Note that this was introduced by #12812. This commit address this by defining the lock ordering to be dp_config_rwlock first, then spa_errlog_lock / spa_errlist_lock. spa_get_errlog() and spa_get_errlog_size() can acquire the locks in this order, and then process_error_block() and get_head_and_birth_txg() can verify that the dp_config_rwlock is already held. Additionally, a buffer overrun in `spa_get_errlog()` is corrected. Many code paths didn't check if `*count` got to zero, instead continuing to overwrite past the beginning of the userspace buffer at `uaddr`. Tested by having some errors in the pool (via `zinject -t data /path/to/file`), one thread running `zpool iostat 0.001`, and another thread runs `zfs destroy` (in a loop, although it hits the first time). This reproduces the problem easily without the fix, and works with the fix. Reviewed-by: Mark Maybee <mark.maybee@delphix.com> Reviewed-by: George Amanakis <gamanakis@gmail.com> Reviewed-by: George Wilson <gwilson@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #14239 Closes #14289 |
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| .. | ||
| raidz_test | ||
| zdb | ||
| zed | ||
| zfs | ||
| zinject | ||
| zpool | ||
| zpool_influxdb | ||
| zstream | ||
| arc_summary | ||
| arcstat.in | ||
| dbufstat.in | ||
| fsck.zfs.in | ||
| Makefile.am | ||
| mount_zfs.c | ||
| zfs_ids_to_path.c | ||
| zgenhostid.c | ||
| zhack.c | ||
| zilstat.in | ||
| ztest.c | ||
| zvol_wait | ||