[syslog-ng] syslog-ng 3.3.1 quits at reload

[Michael Hocke]

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On Nov 9, 2011, at 3:52 PM, Balazs Scheidler wrote:

> On Tue, 2011-11-08 at 16:08 -0500, Michael Hocke wrote:
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>> 
>> 
>> Hi there,
>> 
>> I am having a problem with syslog-ng 3.3.1. Once in a while syslog-ng quits with a QUIT signal after it was asked to reload the configuration through a HUP signal. I have two instances of it running in separate Solaris 10 zones. Both are extremely busy and both crashed once within the last two weeks. By looking at the code in lib/mainloop.c I found the place where syslog-ng quits. It is within main_loop_reload_config_apply caused by a corrupt old configuration. [ ... ]

> [ ... ]
> The issue is worse as it has no place to write this information as a
> troubleshooting aid if running in the background, as it has no console
> at this point. Perhaps you could run syslog-ng in the foreground,
> redirect all internal logs to stderr using the -e switch and see what
> causes trouble?

I figured out how to reproduce this error. It happens after sending 16 HUPs to the process. This seems to be the magic number. This is the error output I am getting:

- ------> SNIP <------
Internal error, duplicate configuration elements refer to the same persistent config; name='dd_queue(d_rad_ap,d_rad_ap#0)'
Internal error, duplicate configuration elements refer to the same persistent config; name='dd_queue(d_dhcpd,d_dhcpd#0)'
Internal error, duplicate configuration elements refer to the same persistent config; name='dd_queue(d_dhcpd,d_dhcpd#0)'
Internal error, duplicate configuration elements refer to the same persistent config; name='dd_queue(d_dhcpd,d_dhcpd#0)'
Internal error, duplicate configuration elements refer to the same persistent config; name='dd_queue(d_dhcpd,d_dhcpd#0)'
Internal error, duplicate configuration elements refer to the same persistent config; name='dd_queue(d_dhcpd,d_dhcpd#0)'
Internal error, duplicate configuration elements refer to the same persistent config; name='dd_queue(d_dhcpd,d_dhcpd#0)'
Internal error, duplicate configuration elements refer to the same persistent config; name='dd_queue(d_rad_proxy,d_rad_proxy#0)'
Internal error, duplicate configuration elements refer to the same persistent config; name='dd_queue(d_radius,d_radius#0)'
Error opening syslog device; filename='/dev/log', error='No such device or address (6)'
Error initializing source driver; source='s_sys', id='s_sys#0'
Error initializing message pipeline;
Error initializing new configuration, reverting to old config;
Multiple internal() sources were detected, this is not possible;
Error initializing source driver; source='s_local', id='s_local#0'
Error initializing message pipeline;
- -------> SNIP <-------

Could this be a side effect of the (now fixed) bug concerning the "duplicate configuration elements"?

- - Michael


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