> > It is reproducable, how can I make a gdb backtrace? What is a core file?
>
> Try this:
>
> dovecot unix - n n - - pipe
> flags=DRhu user=vmail:mail argv=/usr/lib/dovecot/gdbhelper
> /tmp/deliver.sh -d ${recipient}
>
> And /tmp/deliver.sh contains:
>
> #!/bin/sh
>
> sleep 1
> exec /usr/lib/dovecot/deliver $*
>
> chmod +x /tmp/deliver.sh and deliver a mail. Hopefully you'll now
> have /tmp/gdbhelper* file(s)? If so, copy&paste contents.
Ah great I got some debugging info (although not sure what it means)
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu"...
"/tmp/deliver.sh": not in executable format: File format not recognized
Attaching to process 22795
Reading symbols from /bin/dash...(no debugging symbols found)...done.
Reading symbols from /lib/tls/i686/cmov/libc.so.6...(no debugging symbols
found)...done.
Loaded symbols for /lib/tls/i686/cmov/libc.so.6
Reading symbols from /lib/ld-linux.so.2...
(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
(no debugging symbols found)
0xb80b3424 in __kernel_vsyscall ()
(gdb) Signal Stop Print Pass to program Description
SIGPIPE No Yes Yes Broken pipe
(gdb) Signal Stop Print Pass to program Description
SIGALRM No No Yes Alarm clock
(gdb) Signal Stop Print Pass to program Description
SIG32 No Yes Yes Real-time event 32
(gdb) Continuing.
Executing new program: /usr/lib/dovecot/deliver
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
Program received signal SIGSEGV, Segmentation fault.
0xb7e0b5bf in unsetenv () from /lib/tls/i686/cmov/libc.so.6
(gdb) #0 0xb7e0b5bf in unsetenv () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#1 0xb7ff80dd in env_remove () from /usr/lib/dovecot/deliver
No symbol table info available.
#2 0xb7f80ad2 in main () from /usr/lib/dovecot/deliver
No symbol table info available.
(gdb) The program is running. Exit anyway? (y or n) [answered Y; input not
from terminal]
