[Bug 1901755] Missing required logs.

This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1901755

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
Status: New => Incomplete

--
You received this bug notification because you are subscribed to linux
in Ubuntu.
Matching subscriptions: Bgg, Bmail, Nb
https://bugs.launchpad.net/bugs/1901755

Title:
"btrfs subvolume list" sporadically segfaults with linux-
image-5.4.0-52-generic

Status in linux package in Ubuntu:
Incomplete

Bug description:
On a BTRFS volume with a lot of subvolumes, I get sporadic segfaults
on "btrfs subvolume list", about 1/3 of the time. This is on Ubuntu
20.04.

linux-image-5.4.0-48-generic does not experience those segfaults.

On #btrfs on freenode, it was pointed out that 5.4.0-52.57 seems to
have a regression but not the fix for it committed. To quote from the
IRC message:

> 5.4.0-52.57 has a regression (a48b73eca4ce btrfs: fix potential
deadlock in the search ioctl) and not the fix (1c78544eaa46 btrfs: fix
wrong address when faulting in pages in the search ioctl)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1901755/+subscriptions