[Bug 1902525] [NEW] btrfs subvolume list segmentation fault

[Marcel]

Public bug reported:

Under Ubuntu 18.04 LTS with HWE-Kernel 5.4.0-52-generic the command

btrfs subvolume list /

sometimes leads to a segmentation fault. Unfortunately I cannot figure
out why some calls of this command work as expected while others (of
exactly the same command) lead to the segmentation fault. On my machine
about every third call leads to the segfault.

In case of the segmentation fault, my syslog contains the following entries:
Nov  2 13:56:11 Sputnik kernel: [153948.460139] btrfs[19583]: segfault at 7ffcd9d8c391 ip 000055d8e5201117 sp 00007ffcd5d8bd20 error 4 in btrfs[55d8e5195000+a9000]
Nov  2 13:56:11 Sputnik kernel: [153948.460153] Code: 00 00 31 c0 8b 5c 24 14 39 9c 24 88 00 00 00 0f 86 f2 01 00 00 48 8b 7c 24 08 48 8d 57 68 48 8d 0c 02 48 83 c0 20 48 89 04 24 <8b> 71 18 8b 79 1c 48 8b 59 08 48 8b 69 10 81 fe 90 00 00 00 89 74

According to
https://forums.linuxmint.com/viewtopic.php?t=333594
I do not seem to be the only one experiencing this problem.

** Affects: btrfs-progs (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1902525

Title:
  btrfs subvolume list segmentation fault

Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Under Ubuntu 18.04 LTS with HWE-Kernel 5.4.0-52-generic the command

  btrfs subvolume list /

  sometimes leads to a segmentation fault. Unfortunately I cannot figure
  out why some calls of this command work as expected while others (of
  exactly the same command) lead to the segmentation fault. On my
  machine about every third call leads to the segfault.

  In case of the segmentation fault, my syslog contains the following entries:
  Nov  2 13:56:11 Sputnik kernel: [153948.460139] btrfs[19583]: segfault at 7ffcd9d8c391 ip 000055d8e5201117 sp 00007ffcd5d8bd20 error 4 in btrfs[55d8e5195000+a9000]
  Nov  2 13:56:11 Sputnik kernel: [153948.460153] Code: 00 00 31 c0 8b 5c 24 14 39 9c 24 88 00 00 00 0f 86 f2 01 00 00 48 8b 7c 24 08 48 8d 57 68 48 8d 0c 02 48 83 c0 20 48 89 04 24 <8b> 71 18 8b 79 1c 48 8b 59 08 48 8b 69 10 81 fe 90 00 00 00 89 74

  According to
  https://forums.linuxmint.com/viewtopic.php?t=333594
  I do not seem to be the only one experiencing this problem.

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