diff options
| author | George Amanakis <[email protected]> | 2020-11-16 18:08:11 +0100 |
|---|---|---|
| committer | GitHub <[email protected]> | 2020-11-16 09:08:11 -0800 |
| commit | 2c210f68189c6f781be050bfdc890cd6dc231fea (patch) | |
| tree | 0e3a245fcbbe6b3e09349a77e4d6cb762ee84882 /module/zfs/arc.c | |
| parent | 24c12b48a196265cf1837cd832b420476a208b47 (diff) | |
Fix ASSERT logic in l2arc_evict()
In case of cache device removal it is possible that at the end of
l2arc_evict() we have l2ad_hand = l2ad_evict. This can lead to the
following panic in case of a debug build:
VERIFY3(dev->l2ad_hand < dev->l2ad_evict) failed (321920512 < 321920512)
Call Trace:
dump_stack+0x66/0x90
spl_panic+0xef/0x117 [spl]
l2arc_remove_vdev+0x11d/0x290 [zfs]
spa_load_l2cache+0x275/0x5b0 [zfs]
spa_vdev_remove+0x4a5/0x6e0 [zfs]
zfs_ioc_vdev_remove+0x59/0xa0 [zfs]
zfsdev_ioctl_common+0x5b3/0x630 [zfs]
zfsdev_ioctl+0x53/0xe0 [zfs]
do_vfs_ioctl+0x42e/0x6b0
ksys_ioctl+0x5e/0x90
do_syscall_64+0x5b/0x1a0
entry_SYSCALL_64_after_hwframe+0x44/0xa9
In case of cache device removal it also possible that l2ad_hand +
distance > l2ad_end since we do not iterate l2arc_evict() and l2ad_hand
is not reset. This has no functional consequence however as the cache
device is about to be removed.
Fix this by omitting the ASSERT in case of device removal.
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: George Amanakis <[email protected]>
Closes #11205
Diffstat (limited to 'module/zfs/arc.c')
| -rw-r--r-- | module/zfs/arc.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/module/zfs/arc.c b/module/zfs/arc.c index 850e8032f..42c09e2e5 100644 --- a/module/zfs/arc.c +++ b/module/zfs/arc.c @@ -8886,9 +8886,16 @@ out: goto top; } - ASSERT3U(dev->l2ad_hand + distance, <, dev->l2ad_end); - if (!dev->l2ad_first) - ASSERT3U(dev->l2ad_hand, <, dev->l2ad_evict); + if (!all) { + /* + * In case of cache device removal (all) the following + * assertions may be violated without functional consequences + * as the device is about to be removed. + */ + ASSERT3U(dev->l2ad_hand + distance, <, dev->l2ad_end); + if (!dev->l2ad_first) + ASSERT3U(dev->l2ad_hand, <, dev->l2ad_evict); + } } /* |