[Bug 293198] zfs deadlock while copying many files, vfs_deleteextattr_dir-related?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293198

--- Comment #16 from [email protected] ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=935cf3284f520c90a63baaadb762caaa30084f5c

commit 935cf3284f520c90a63baaadb762caaa30084f5c
Author:     Rick Macklem <[email protected]>
AuthorDate: 2026-02-17 22:57:42 +0000
Commit:     Rick Macklem <[email protected]>
CommitDate: 2026-02-17 22:59:57 +0000

    vfs_mount.c: Don't call VFS_MOUNT() if only exports are being updated

    PR#293198 reports a hang within ZFS when exports
    are being updated concurrently with a VOP_SETEXTATTR().
    The hang appears to be caused by mishandling of the
    z_teardown_lock, but fixing handling of this lock appears
    to be a major effort. Since the hang occurs when
    VFS_MOUNT() acquires a write/exclusive z_teardown_lock,
    which rarely occurs, except when exports are being updated,
    this patch avoids the VFS_MOUNT() call for this case.

    Avoiding a VFS_MOUNT() call fixes the hang for the case
    reported by PR#293198 and is also an optimization.
    As such, this patch avoids the VFS_MOUNT() call when only exports
    are being updated similar to what was already being done
    within vnet prisons.

    PR:     293198
    Reviewed by:    kib, markj
    MFC after:      1 week
    Differential Revision:  https://reviews.freebsd.org/D55318

 sys/kern/vfs_mount.c | 52 +++++++++++++++++++++++++++++++---------------------
 1 file changed, 31 insertions(+), 21 deletions(-)

-- 
You are receiving this mail because:
You are the assignee for the bug.