kern/147162: [jail] [panic] Page Fault / Kernel panic when jail
starts on boot
Tom.DEWAELE at abvv.be
Tom.DEWAELE at abvv.be
Thu Jun 3 14:00:06 UTC 2010
The following reply was made to PR kern/147162; it has been noted by GNATS.
From: <Tom.DEWAELE at abvv.be>
To: <bug-followup at FreeBSD.org>
Cc:
Subject: Re: kern/147162: [jail] [panic] Page Fault / Kernel panic when jail starts on boot
Date: Thu, 3 Jun 2010 15:32:03 +0200
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I've obtained some more information.
=20
I had a hunch this was caused by a PF rule.
I disabled PF and the jails did not cause a panic.
Then I disabled the suspicious rule and again no panic.
Re-enabled the rule -> panic.
=20
This is the rule that is either directly or indirectly involved in the
kernel panic:
pass out quick route-to (lagg0 10.200.0.1) from 10.200.0.0/24 to !
10.200.0.0/24
=20
I have this rule because my jails are on another vlan so they need to
use another interface for outgoing packets.
The problem must be linked to this rerouting.
=20
Today I've built a debugging kernel with the options you suggested.
I was able to get a backtrace with DDB.
=20
You can find the panic here:
http://tweakers.net/ext/f/iirS2Omm8Nfmbpb0BLKSRSzY/full.jpg
<http://tweakers.net/ext/f/iirS2Omm8Nfmbpb0BLKSRSzY/full.jpg>=20
and the backtrace I did here:
http://tweakers.net/ext/f/doP5G3aux6tSZdZt6hTtaWTR/full.jpg
<http://tweakers.net/ext/f/doP5G3aux6tSZdZt6hTtaWTR/full.jpg>=20
=20
The backtrace has 2 pf_route calls so that confirms again my hunch.
=20
This must be caused by kernel code changes made from 8.0p2 to 8.0p3
8.0p2 did not cause the kernel panic.
=20
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<p class=3DMsoPlainText><span lang=3DEN-US>I've obtained some more =
information.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>I had a hunch this was caused =
by a PF
rule.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>I disabled PF and the jails =
did not
cause a panic.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>Then I disabled the =
suspicious rule and
again no panic.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>Re-enabled the rule -> =
panic.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>This is the rule that is =
either directly
or indirectly involved in the kernel panic:<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>pass out quick route-to =
(lagg0
10.200.0.1) from 10.200.0.0/24 to ! 10.200.0.0/24<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>I have this rule because my =
jails are on
another vlan so they need to use another interface for outgoing =
packets.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>The problem must be linked to =
this
rerouting.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>Today I've built a debugging =
kernel with
the options you suggested.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>I was able to get a backtrace =
with DDB.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>You can find the panic =
here:<o:p></o:p></span></p>
<p class=3DMsoPlainText><a
href=3D"http://tweakers.net/ext/f/iirS2Omm8Nfmbpb0BLKSRSzY/full.jpg"><spa=
n
lang=3DEN-US>http://tweakers.net/ext/f/iirS2Omm8Nfmbpb0BLKSRSzY/full.jpg<=
/span></a><span
lang=3DEN-US><o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>and the backtrace I did =
here:<o:p></o:p></span></p>
<p class=3DMsoPlainText><a
href=3D"http://tweakers.net/ext/f/doP5G3aux6tSZdZt6hTtaWTR/full.jpg"><spa=
n
lang=3DEN-US>http://tweakers.net/ext/f/doP5G3aux6tSZdZt6hTtaWTR/full.jpg<=
/span></a><span
lang=3DEN-US><o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>The backtrace has 2 pf_route =
calls so
that confirms again my hunch.<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>This must be caused by kernel =
code
changes made from 8.0p2 to 8.0p3<o:p></o:p></span></p>
<p class=3DMsoPlainText><span lang=3DEN-US>8.0p2 did not cause the =
kernel panic.<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
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