[Bug 699665] [NEW] sshd crashed during a rsync

[Simon Déziel]

Public bug reported:

sshd crashed while I was running rsync like this (from the local
computer, not the one where sshd crashed) :

$ time rsync --bwlimit=85 --delete -e 'ssh -i /home/simon/.ssh/id_rsa' --exclude '.DS_Store' --numeric-ids --fuzzy --compress-level=9 -avzxH dlgm:/data/musique/ /mnt/marcel/musique/; date
rsync: connection unexpectedly closed (145354473 bytes received so far) [receiver]
rsync error: error in rsync protocol data stream (code 12) at io.c(601) [receiver=3.0.7]
rsync: connection unexpectedly closed (55173 bytes received so far) [generator]
rsync error: unexplained error (code 255) at io.c(601) [generator=3.0.7]

real    32m5.221s
user    0m7.820s
sys     0m1.030s
Thu Jan  6 10:11:39 EST 2011

And this produced this log message on the remote server :

Jan  6 10:10:57 marcel kernel: [158878.615389] __ratelimit: 57 callbacks suppressed
Jan  6 10:10:57 marcel kernel: [158878.615400] sshd[28170]: segfault at 7fff2ed1e2f0 ip 00007ffe2e2c5f16 sp 00007fffc07ee280 error 6 in sshd[7ffe2e28a000+6c000]

According to the time delta both error occurred at the same time (which
is logic). I've been running this synchronization for a couple of days
now and it's the first crash of sshd. The transfer abort a few times
before but that was not sshd's fault, or at least it was not logging
anything about it.

The local and remote end both have the same packages version.
$ lsb_release -rd
Description:	Ubuntu 10.04.1 LTS
Release:	10.04

$ apt-cache policy openssh-server
openssh-server:
  Installed: 1:5.3p1-3ubuntu4
  Candidate: 1:5.3p1-3ubuntu4
  Version table:
 *** 1:5.3p1-3ubuntu4 0
        500 http://ca.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
     1:5.3p1-3ubuntu3 0
        500 http://ca.archive.ubuntu.com/ubuntu/ lucid/main Packages

$ apt-cache policy rsync
rsync:
  Installed: 3.0.7-1ubuntu1
  Candidate: 3.0.7-1ubuntu1
  Version table:
 *** 3.0.7-1ubuntu1 0
        500 http://ca.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: openssh-server 1:5.3p1-3ubuntu4
ProcVersionSignature: Ubuntu 2.6.32-27.49-server 2.6.32.26+drm33.12
Uname: Linux 2.6.32-27-server x86_64
Architecture: amd64
Date: Thu Jan  6 19:32:53 2011
ProcEnviron:
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: openssh

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lucid

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https://bugs.launchpad.net/bugs/699665

Title:
  sshd crashed during a rsync