[collectd] collectd 4.5.4 - segfault after setting time

[Vogt, Michael]

Hey florian

Here is the backtrace of the bug:

(gdb) bt
#0  0xb7ef2424 in __kernel_vsyscall ()
#1  0xb7ecccf6 in nanosleep () from /lib/libpthread.so.0
#2  0x0804cf72 in main (argc=4, argv=0x2c7586b2) at collectd.c:341

(gdb) bt full
#0  0xb7ef2424 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb7ecccf6 in nanosleep () from /lib/libpthread.so.0 No symbol table info available.
#2  0x0804cf72 in main (argc=4, argv=0x2c7586b2) at collectd.c:341
        sig_int_action = {__sigaction_handler = {sa_handler = 0x804c520 <sig_int_handler>,
    sa_sigaction = 0x804c520 <sig_int_handler>}, sa_mask = {__val = {0 <repeats 32 times>}}, sa_flags = 0,
  sa_restorer = 0}
        sig_term_action = {__sigaction_handler = {sa_handler = 0x804c52b <sig_term_handler>,
    sa_sigaction = 0x804c52b <sig_term_handler>}, sa_mask = {__val = {0 <repeats 32 times>}}, sa_flags = 0,
  sa_restorer = 0}
        sig_usr1_action = {__sigaction_handler = {sa_handler = 0x804cff0 <sig_usr1_handler>,
    sa_sigaction = 0x804cff0 <sig_usr1_handler>}, sa_mask = {__val = {0 <repeats 32 times>}}, sa_flags = 0,
  sa_restorer = 0}
        sig_pipe_action = {__sigaction_handler = {sa_handler = 0x1, sa_sigaction = 0x1}, sa_mask = {__val = {
      0 <repeats 32 times>}}, sa_flags = 0, sa_restorer = 0}
        configfile = <value optimized out>
        test_config = 0
        basedir = 0x8063018 "/var/lib/collectd"
        sig_chld_action = {__sigaction_handler = {sa_handler = 0x1, sa_sigaction = 0x1}, sa_mask = {__val = {
      0 <repeats 32 times>}}, sa_flags = 0, sa_restorer = 0}
        pid = <value optimized out>
        daemonize = 0



Cheers and thanks in advance
michael
 

-----Ursprüngliche Nachricht-----
Von: Florian Forster [mailto:octo at verplant.org]
Gesendet: Montag, 18. Mai 2009 14:59
An: Vogt, Michael
Cc: collectd at verplant.org
Betreff: Re: collectd and openipmi plugin (WARNING!!! PGP with incorrect signature)

Hi Michael,

On Mon, May 18, 2009 at 10:54:35AM +0200, Vogt, Michael wrote:
> i use collectd (collectd-4.5.4.tar.gz) with the openipmi plugin 
> (OpenIPMI-2.0.16.tar.gz), which basically works fine. but i detected 
> an error, relating to date/time change. if i change the system 
> date/time, collectd just crashes (segfaults).

sorry, I didn't read this mail before replying to your previous one.

> The segfault does only occour if i use openipmi sensors.

That this problem only occurs with the IPMI plugin enabled is a great hint, thank you! :)

> U enabled coredumps on my system, but without luck. If collectd 
> crashed, it will no write a core dump file.

Core-dumps are often deactivated by default in many distributions, because often people don't know how to deal with them and they may become very large.

You can enable core-dumps by specifying
  ulimit -c unlimited
in the command line before starting the daemon (with that same shell), ideally doing something like:
  /path/to/collectd -f -C /path/to/collectd.conf

An alternative method would be to start collectd in a debugger to begin
with:
  gdb /path/to/collectd
  ...
  > run -f -C /path/to/collectd.conf

> To reproduce the bug, i restart ntp and set some date commands.
> Collectd does not crash each time when i issued a date command, 
> sometimes after 2, sometimes after 10 times. So ist quite hard to 
> reproduce.

Actually, this sounds like a relyable method of reprocuding the bug, so we're half way of having it fixed! :)

Regards,
-octo
--
Florian octo Forster
Hacker in training
GnuPG: 0x91523C3D
http://verplant.org/
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