gvfsd-sftp segfaults when doing a lot of I/O

[Simon Déziel]

Binary package hint: gvfs

I access my music on a remote server using SSHFS. This music is imported/read by Rhythmbox. I have found that if I play music from the SSHFS folder while I am also importing some folders in the same SSHFS directory gvfsd-sftd reports segfaults in /var/log/messages :

Nov 2 11:37:05 simon-laptop kernel: [12311.088606] show_signal_msg: 24 callbacks suppressed
Nov 2 11:37:05 simon-laptop kernel: [12311.088616] gvfsd-sftp[9336]: segfault at 28 ip 00000000004173b4 sp 00007fff1f5119b0 error 4 in gvfsd-sftp[400000+2c000]
Nov 2 11:40:09 simon-laptop kernel: [12494.517225] gvfsd-sftp[13858]: segfault at 28 ip 00000000004173b4 sp 00007fff15f6c990 error 4 in gvfsd-sftp[400000+2c000]

The importation is more reliable when I do _not_ play any music. Once the importation is done I have no problem in playing all the music I want.

Both systems run Ubuntu Lucid. One thing to note is that I run the backported kernel from Maverick on my laptop (the client).

$ ps aux| grep sftp
simon 13965 15.9 0.1 66852 4600 ? S 11:41 3:00 /usr/lib/gvfs/gvfsd-sftp --spawner :1.6 /org/gtk/gvfs/exec_spaw/5
simon 13969 23.6 0.0 38784 2556 pts/2 Ss+ 11:41 4:28 /usr/bin/ssh -oForwardX11 no -oForwardAgent no -oClearAllForwardings yes -oProtocol 2 -oNoHostAuthenticationForLocalhost yes -s xeon sftp

$ lsb_release -rd
Description: Ubuntu 10.04.1 LTS
Release: 10.04

$ apt-cache policy gvfs-backends
gvfs-backends:
  Installed: 1.6.1-0ubuntu1build1
  Candidate: 1.6.1-0ubuntu1build1
  Version table:
 *** 1.6.1-0ubuntu1build1 0
        500 http://ca.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
     1.6.0+git20100414-0ubuntu1 0
        500 http://ca.archive.ubuntu.com/ubuntu/ lucid/main Packages

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: gvfs-backends 1.6.1-0ubuntu1build1
ProcVersionSignature: Ubuntu 2.6.35-22.34~lucid1-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
Architecture: amd64
Date: Tue Nov 2 11:53:43 2010
EcryptfsInUse: Yes
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: gvfs

[Simon Déziel (sdeziel)]

I just got another segfault while doing import only.

Nov 2 12:12:22 simon-laptop kernel: [14427.641033] gvfsd-sftp[13965]: segfault at 28 ip 00000000004173b4 sp 00007fff65e356a0 error 4 in gvfsd-sftp[400000+2c000]

[Simon Déziel (sdeziel)]

I have installed the following packages to have the debug symbols :

ii gvfs-backends-dbgsym 1.6.1-0ubuntu1build1 debug symbols for package gvfs-backends
ii libgvfscommon0-dbgsym 1.6.1-0ubuntu1build1 debug symbols for package libgvfscommon0

And I followed https://wiki.ubuntu.com/Backtrace to produce the backtrace attached. If any other information is required I will provide it on request.

[Pedro Villavicencio (pedro)]

Thanks for the bug report. This particular bug has already been reported into our bug tracking system, but please feel free to report any further bugs you find.