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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)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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"btrfs subvolume list" sporadically segfaults with linux-image-5.4.0-52-generic
https://bugs.launchpad.net/bugs/1901755
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