mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-26 03:09:34 +03:00
2ebc7b72b3
There exists a lock inversion between the z_xattr_lock and the
z_teardown_lock. Resolve this by taking the z_teardown_lock in
all registered xattr callbacks prior to taking the z_xattr_lock.
This ensures the locks are always taken is the same order thus
preventing a deadlock. Note the z_teardown_lock is taken again
in zfs_lookup() and this is safe because the z_teardown lock is
a re-entrant read reader/writer lock.
* process-1
zpl_xattr_get -> Takes zp->z_xattr_lock
__zpl_xattr_get
zfs_lookup -> Takes zsb->z_teardown_lock in ZFS_ENTER macro
* process-2
zfs_ioc_recv -> Takes zsb->z_teardown_lock in zfs_suspend_fs()
zfs_resume_fs
zfs_rezget -> Takes zp->z_xattr_lock
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Closes #3943
Closes #3969
Closes #4121
|
||
|---|---|---|
| .. | ||
| avl | ||
| nvpair | ||
| unicode | ||
| zcommon | ||
| zfs | ||
| zpios | ||
| .gitignore | ||
| Makefile.in | ||