bugdavfs2 - Bugs: bug #59983, umount.davfs[3585]: segfault in...


bug #59983: umount.davfs[3585]: segfault in libc-2.31.so

Submitter:  None
Submitted:  Mon 01 Feb 2021 12:59:07 PM UTC
Category:  None Severity:  3 - Normal
Item Group:  None Status:  Need Info
Privacy:  Public Assigned to:  _71007
Open/Closed:  Open
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Wed 03 Feb 2021 10:51:30 AM UTC, comment #1: 

Knowing the version of davfs2 would be useful.
If your version is older than 1.5.6 this is probably bug #56286. You should try to get a newer version e.g. from Debian testing. You also might use "umount -i" to unmount. In this case the umount helper umount.davfs (which has the bug) is not called at all.

What confuses me:
root@mediavault:/mnt# umount /mnt/big1und1topf/
grep -Eni "umount.davfs" /var/log/syslog

Does your system automatically call grep when a programm crashes or did you leave out some information.

Additional remark:
https://sd2dav.1und1.de /mnt/big1und1topf davfs rw,auto,user,uid=mylocaluser,gid=users,_netdev 0 0
Option "auto" will cause that the filesystem is automatically mounted at system start with root privileges. The additional option "user" makes no sense in this case.


- <_71007>
Mon 01 Feb 2021 12:59:07 PM UTC, original submission:  

Kernel: 5.4.0-65-generic x86_64 bits: 64 Console: tty 0 Distro: Ubuntu 20.04.2 LTS (Focal Fossa)

A mounted webdav folder specified in fstab is not unmounted using umount nor an error free shutdown can be performed.

root@mediavault:/media# cat /etc/fstab
# /etc/fstab: static file system information.
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/ubuntu-vg/ubuntu-lv during curtin installation
/dev/disk/by-id/dm-uuid-LVM-3hBK8ZvW7CzIPT2TcSxZenLY8g8u4FEFSM3BRU1tnfDB6DIMDCVrzZIcZN8tbmwH / ext4 defaults 0 0
# /home was on /dev/ubuntu-vg/lv-0 during curtin installation
/dev/disk/by-id/dm-uuid-LVM-3hBK8ZvW7CzIPT2TcSxZenLY8g8u4FEFhvveEQH6Ex2aExWDloSdUcGmdvxIdo0H /home ext4 defaults 0 0
# /boot was on /dev/sda2 during curtin installation
/dev/disk/by-uuid/cb40544b-4d9c-4b66-8f16-04674b9e34ad /boot ext4 defaults 0 0
/swap.img none swap sw 0 0
#Next is 1und1 big webdav repository
https://sd2dav.1und1.de /mnt/big1und1topf davfs rw,auto,user,uid=mylocaluser,gid=users,_netdev 0 0

root@mediavault:/mnt# umount /mnt/big1und1topf/
grep -Eni "umount.davfs" /var/log/syslog

6324:Feb  1 13:52:29 mediavault kernel: [ 5192.384750] umount.davfs[3630]: segfault at 455fe000 ip 00007f009f600d5a sp 00007ffc4d3895d8 error 4 in libc-2.31.so[7f009f571000+178000]


root@mediavault:/mnt# fusermount -u /mnt/big1und1topf/

does the job correctly.



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    Date Changed by Updated Field Previous Value => Replaced by
    2021-02-03 _71007 StatusNone Need Info
        Assigned toNone _71007

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