Date: Thu, 19 Oct 1995 10:31:31 +0000 () From: Nik Clayton <nik@blueberry.co.uk> To: questions@freebsd.org Subject: /kernel: Null pmap (cb) at va: 0x0 Message-ID: <199510191031.KAA00330@elbereth.blueberry.co.uk>
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Hi folks,
While running 2.0.5, on a Pentium with a (thought to be) dodgy chip
cache, I was in the middle a lightly loaded X session (3 xterms, running
2 shells and a copy of elm) when I tried to run Netscape 1.12.
X then promptly died on me,
Looking /var/log/messages I see
Oct 19 10:00:01 elbereth /kernel: Null pmap (tb) at va: 0x0
Oct 19 10:00:01 elbereth last message repeated 6 times
Oct 19 10:00:01 elbereth /kernel: Null pmap (cb) at va: 0x0
Oct 19 10:00:01 elbereth /kernel: Null pmap (tb) at va: 0x0
Oct 19 10:00:01 elbereth last message repeated 8 times
Oct 19 10:00:01 elbereth /kernel: Null pmap (cb) at va: 0x0
Oct 19 10:00:01 elbereth /kernel: Null pmap (tb) at va: 0x0
I have never seen this before, and I've been running 2.0.5 since about a
week after it's release.
Messages of that form appear in `messages' from 10:00:00 this morning (I
first logged in at 9:50) and continue until I rebooted the system at
10:10:27. My X system didn't disappear until 10:09, with the following
entries
Oct 19 10:09:08 elbereth /kernel: pid 912: xterm: uid 0: exited on signal 11
Oct 19 10:09:08 elbereth /kernel: pid 896: xclock: uid 1000: exited on signal 11
Oct 19 10:09:08 elbereth /kernel: pid 905: xterm: uid 0: exited on signal 11
Oct 19 10:09:08 elbereth /kernel: pid 897: xload: uid 1000: exited on signal 11
Oct 19 10:09:08 elbereth /kernel: pid 890: xterm: uid 0: exited on signal 11
Oct 19 10:09:08 elbereth /kernel: pid 898: xterm: uid 0: exited on signal 11
A quick
grep "Null pmap" /var/log/messages*
shows that this is the first time these errors have occured since Aug 26
(as far back as my logs go).
The machine was last rebooted at 18:47 yesterday, so it's not like
there'd been a fantastically long uptime.
Suspicious that this happened at exactly 10:00 I thought maybe something
kicked off by cron caused it. But in /var/cron/log there is just
Oct 19 10:00:00 elbereth CRON[978]: (root) CMD (/usr/libexec/atrun)
root (10/19-10:05:00-982) CMD (/usr/libexec/atrun)
which looks fairly standard to me.
So, cosmic rays, or something more important?
N
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