On Mon, 30 Sep 2013, 19:55 +1000, John Marshall wrote: > Another data point: both systems on which I have seen this panic have > the ipmi driver compiled in. ipmi makes the BMC's watchdog timer > available to the system.
So, I decided to revert my source tree to a clean releng/9.2 (9.2-RELEASE) and recompile without the ipmi driver (so there goes the watchdog timer too), and see how the system behaved. I was able to stop and start ntpd without mishap. If ntpd was not running, the system would reboot cleanly. If ntpd was running, the system would panic during shutdown - vm_page_unwire - while stopping ntpd. I decided to switch my source tree back to releng/9.1 (9.1-RELEASE-p7), rebuild, and test. Booted into the 9.1 kernel in single-user, installed the 9.1 world, make delete-old, decided to skip mergemaster (why??!!); reboot; and it wouldn't :-/ menuset-loadinitial not found Consoles: internal video/keyboard BIOS drive C: is disk0 BIOS drive D: is disk1 BIOS 565kB/3136000kB available memory FreeBSD/x86 bootstrap loader, Revision 1.1 (r...@ozsrv04.riverwillow.net.au, Tue Oct 1 18:04:14 AEST 2013) Can't work out which disk we are booting from. Guessed BIOS device 0xffffffff not found by probes, defaulting to disk0: panic: free: guard1 fail @ 0xbf492150 from /kits/src/sys/boot/i386/loader/ ../../common/module.c:1004 That should keep me entertained until the morning (this is a remote system). -- John Marshall
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