[Dovecot] expire plugin + --exec-mail in 1.2.6 version

[Nikita Koshikov]

On Thu, 05 Nov 2009 12:52:08 -0500
Timo Sirainen <tss at iki.fi> wrote:

> On Sat, 2009-10-31 at 10:42 +0200, Nikita Koshikov wrote:
> > The patch helped with quotas, but it raises new error - "segmentation error"
> 
> gdb backtrace would be helpful. But how to actually get it could be a
> bit difficult, since I guess kernel thinks expire-tool is a setuid
> program.
> 
> There are two ways I guess:
> 
> a) Apply attached diff1 and see if core dump gets written. Once you get
> a core, use "gdb expire-tool core", "bt full".
This didn't create core file.

> 
> b) If not, apply diff2 and start expire-tool. Then look up its pid and
> run "gdb -p <pid>", "cont", wait for crash, "bt full".

I don't understand why gdb says "no debugging symbols found" for some dovecot's executables, all binaries under /usr/libexec/dovecot have "not stripped"

GNU gdb 6.8
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 "i686-pc-linux-gnu".
Attaching to process 26407
Reading symbols from /usr/libexec/dovecot/expire-tool...(no debugging symbols found)...done.
Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/librt.so.1
Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libpthread.so.0...
(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
[New Thread 0xb7f02ac0 (LWP 26407)]
Loaded symbols for /lib/libpthread.so.0
(no debugging symbols found)
0xffffe424 in __kernel_vsyscall ()
(gdb) cont
Continuing.
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(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.
[Switching to Thread 0xb7f02ac0 (LWP 26407)]
0xb7f88749 in ?? () from /lib/libc.so.6
(gdb) bt full
#0  0xb7f88749 in ?? () from /lib/libc.so.6
No symbol table info available.
Cannot access memory at address 0xbf690ff8
(gdb) quit
The program is running.  Quit anyway (and detach it)? (y or n) y
Detaching from program: /usr/libexec/dovecot/expire-tool, process 26407