another bug: system time change

[Wolfgang Hennerbichler]

Hi Ondrejs, 

I think I found another bug. For some mysterious reason our system time jumped forward (more than 30.000 seconds) on one of our route-servers. I don't know why this happened, but I suspect a broken ntp server could have caused this. Nevetheless, this was reason enough for BIRD to drop the BGP peerings: 

You see the log-entries from the wtachdog, which is run every minute, all of a sudden the time jumps to 10:08 UTC, and BIRD brings down BGP sessions. Are the session hold timers dependent on the system time? 

Apr  9 01:33:01 rs2 /USR/SBIN/CRON[25129]: (root) CMD (/usr/local/sbin/watchdog.sh)
Apr  9 01:34:01 rs2 /USR/SBIN/CRON[25136]: (root) CMD (/usr/local/sbin/watchdog.sh)
Apr  9 01:35:01 rs2 /USR/SBIN/CRON[25143]: (root) CMD (/usr/local/sbin/watchdog.sh)
Apr  9 10:08:28 rs2 bird: R8596x189: Error: Hold timer expired
Apr  9 10:08:28 rs2 bird: R8596x189: BGP session closed
Apr  9 10:08:28 rs2 bird: R8596x189: State changed to flush
Apr  9 10:08:28 rs2 bird: R3330x113: Error: Hold timer expired
Apr  9 10:08:28 rs2 bird: R3330x113: BGP session closed
Apr  9 10:08:28 rs2 bird: R3330x113: State changed to flush
Apr  9 10:08:28 rs2 bird: R1853x104: Error: Hold timer expired

Wolfgang
 
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