** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Focal)
Status: New => In Progress
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Kellen Renshaw (krenshaw)
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1966803
Title:
xfs: Fix deadlock between AGI and AGF when target_ip exists in
xfs_rename()
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Focal:
In Progress
Bug description:
SRU Justification:
[Impact]
* The xfs filesystem suffers from a deadlock issue in kernels < 5.5.
This hangs IO to/from the affected filesystem. Sample backtraces added
as a comment.
[Fix]
* 93597ae8dac0149b5c00b787cba6bf7ba213e666 93597ae8dac0 "xfs: Fix
deadlock between AGI and AGF when target_ip exists in xfs_rename()"
* This is from the upstream 5.5 kernel.
[Test Plan]
* Set up an Ubuntu Bionic/Focal installation using kernel 5.4.
* Create and mount an XFS filesystem on a block device.
* Exercise the filesystem to verify that IO does not hang.
[Where problems could occur]
* This patch could cause locking issues on XFS filesystems, requiring
a system restart to correct.
[Other Info]
* Bug is difficult to reproduce, a test kernel on affected systems
with the above patch prevented the issue.
* Backports to earlier (4.15 and earlier) kernels have been omitted as
the upstream patch does not apply cleanly and the issue has not been
reproduced on them.
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