Date: Fri, 3 May 1996 23:24:30 -0400 (EDT) From: Brian Tao <taob@io.org> To: FREEBSD-HACKERS-L <freebsd-hackers@freebsd.org> Subject: News server kernel panics, dmesg buffer too small... Message-ID: <Pine.NEB.3.92.960503224431.22516K-100000@zot.io.org>
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For whatever reason, my news server crashed twice today. This was
all I could get out of the syslog:
May 3 00:02:34 news1 batcher[17263]: batcher bialik times user 0.063 system 0.220 elapsed 11.684
May 3 00:02:34 news1 batcher[17263]: batcher bialik stats batches 1 articles 271 bytes 521024
May 3 00:02:40 news1 nnrpd[16599]: akira.net5a.io.org group alt.binaries.nude.celebrities 20
May 3 00:13:26 news1 /kernel: <FF><07>
May 3 00:13:27 news1 lpd[103]: restarted
May 3 00:13:30 news1 innd: ME descriptors 2048
May 3 00:13:30 news1 innd: ME outgoing 2035
[...]
May 3 19:26:45 news1 nnrpd[20383]: gleaner.net4.io.org group comp.binaries.psion 1
May 3 19:37:07 news1 /kernel: vm_page_free: offset(565248), bmapped(1), busy(0), PG_BUSY(0)
May 3 19:37:07 news1 /kernel: panic: vm_page_free: freeing busy page
May 3 19:37:07 news1 /kernel:
May 3 19:37:08 news1 /kernel: syncing disks... 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 giving up
May 3 19:37:08 news1 /kernel: Automatic reboot in 15 seconds - press a key on the console to abort
May 3 19:37:08 news1 /kernel: Rebooting...
May 3 19:37:08 news1 /kernel: FreeBSD 2.1.0-RELEASE #0: Fri Feb 16 21:05:06 EST 1996
May 3 19:37:08 news1 /kernel: taob@cabal.io.org:/src/2.1.0-RELEASE/sys/compile/NEWS
In the first instance, the one /kernel line was the only thing
left in syslog. No panic message or boot messages were recorded (how
did the bootup stuff not get saved?).
In the second case, it looks like the panic may have been
truncated. Is it possible to locate the cause of the panic given
above? This is the first time I've seeen a vm_page_free panic logged
with the offset, etc. information.
Anyhow, it would be nice if the default message buffer was bumped
up to 8K. Boot time messages on my news server add up to 3678 bytes
(9 drives to report). There was some discussion back in February
about doing this, but the March 23 snapshot still allocated 4K (I
haven't had a chance to check out the May 1 snapshot). What do I need
to recompile with a larger MSG_BSIZE? There's the kernel, dmesg and
syslogd... anything else?
--
Brian Tao (BT300, taob@io.org, taob@ican.net)
Systems and Network Administrator, Internet Canada Corp.
"Though this be madness, yet there is method in't"
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