[Bug 290673] [NEW] fusesmb mount disappears - libsmbclient segfaults

[John Carlyle-Clarke]

Public bug reported:

Binary package hint: libsmbclient

In latest 8.10, I find that when using a filesystem mounted with
fusesmb, the filesystem will suddenly disappear.  This is very
repeatable and does seem to be load related although more experimenting
will be needed to find the exact cause.

Each time it happens, I get a line in my log:

Oct 29 10:02:57 gort kernel: [69797.713426] fusesmb[16090]: segfault at 4 ip b7c03590 sp b5514dc0 error 4 in libsmbclient.so.0[b7b88000+386000]
Oct 29 11:00:01 gort kernel: [73221.338081] fusesmb[20089]: segfault at 4 ip b7cc9590 sp b55dadc0 error 4 in libsmbclient.so.0[b7c4e000+386000]

I've tried to get a backtrace with gdb, having installed fusesmb-dbgsym
and libsmbclient-dbgsym but I can't seem to get it to attach properly.
I'm a total noob with gdb, but I've tried "set follow-fork-mode child"
and "set debug lin-lwp 1" but nothing seems to do the trick.  I've asked
around but to no avail, so if any deb could tell me how to supply a
backtrace (or any other info you need) I'll be glad to oblige.

By the way, should apport pick this crash up, or not?

Note that I always found fusesmb very stable when used in exactly the
same way on 8.04.

johncc at gort:~$ apt-cache policy libsmbclient
libsmbclient:
  Installed: 2:3.2.3-1ubuntu3
  Candidate: 2:3.2.3-1ubuntu3
  Version table:
 *** 2:3.2.3-1ubuntu3 0
        500 http://archive.ubuntu.com intrepid/main Packages
        100 /var/lib/dpkg/status

johncc at gort:~$ apt-cache policy fusesmb
fusesmb:
  Installed: 0.8.7-1
  Candidate: 0.8.7-1
  Version table:
 *** 0.8.7-1 0
        500 http://archive.ubuntu.com intrepid/universe Packages
        100 /var/lib/dpkg/status
johncc at gort:~$

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

** Description changed:

  Binary package hint: libsmbclient
  
  In latest 8.10, I find that when using a filesystem mounted with
  fusesmb, the filesystem will suddenly disappear.  This is very
  repeatable and does seem to be load related although more experimenting
  will be needed to find the exact cause.
  
  Each time it happens, I get a line in my log:
  
  Oct 29 10:02:57 gort kernel: [69797.713426] fusesmb[16090]: segfault at 4 ip b7c03590 sp b5514dc0 error 4 in libsmbclient.so.0[b7b88000+386000]
  Oct 29 11:00:01 gort kernel: [73221.338081] fusesmb[20089]: segfault at 4 ip b7cc9590 sp b55dadc0 error 4 in libsmbclient.so.0[b7c4e000+386000]
  
  I've tried to get a backtrace with gdb, having installed fusesmb-dbgsym
  and libsmbclient-dbgsym but I can't seem to get it to attach properly.
  I'm a total noob with gdb, but I've tried "set follow-fork-mode child"
  and "set debug lin-lwp 1" but nothing seems to do the trick.  I've asked
  around but to no avail, so if any deb could tell me how to supply a
  backtrace (or any other info you need) I'll be glad to oblige.
  
  By the way, should apport pick this crash up, or not?
  
+ Note that I always found fusesmb very stable when used in exactly the
+ same way on 8.04.
+ 
  johncc at gort:~$ apt-cache policy libsmbclient
  libsmbclient:
    Installed: 2:3.2.3-1ubuntu3
    Candidate: 2:3.2.3-1ubuntu3
    Version table:
   *** 2:3.2.3-1ubuntu3 0
          500 http://archive.ubuntu.com intrepid/main Packages
          100 /var/lib/dpkg/status
  
  johncc at gort:~$ apt-cache policy fusesmb
  fusesmb:
    Installed: 0.8.7-1
    Candidate: 0.8.7-1
    Version table:
   *** 0.8.7-1 0
          500 http://archive.ubuntu.com intrepid/universe Packages
          100 /var/lib/dpkg/status
  johncc at gort:~$

-- 
fusesmb mount disappears - libsmbclient segfaults
https://bugs.launchpad.net/bugs/290673
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