[Bug 1902525] Re: btrfs subvolume list segmentation fault

[Andreas Schildbach]

I'm seeing this on fully-updated Ubuntu 20.04 LTS with stock kernel
5.4.0-52-generic.

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Title:
  btrfs subvolume list segmentation fault

Status in btrfs-progs package in Ubuntu:
  Confirmed

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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