[uml-devel] UML kernel crash

[uml-devel] UML kernel crash

[Toralf Förster]

Hello,

under an almost stable Gentoo as a host system today my UML kernel
linux-v2.6.36-rc7 crashed  when I tried to access the phpsysinfo page
of the apache server :

Kernel panic - not syncing: Kernel mode fault at addr 0x4, ip 0x80defda
082fcb44:  [<082812bb>] dump_stack+0x22/0x24
082fcb5c:  [<08281320>] panic+0x63/0x167
082fcb84:  [<0805f282>] segv+0x1e2/0x2b0
082fcc3c:  [<0805f391>] segv_handler+0x41/0x60
082fcc5c:  [<0806fa54>] sig_handler_common+0x54/0xa0
082fccd8:  [<0806fbf7>] sig_handler+0x27/0x50
082fcce8:  [<0806fe4c>] handle_signal+0x5c/0xa0
082fcd0c:  [<080721c8>] hard_handler+0x18/0x20
082fcd1c:  [<b7773400>] 0xb7773400


EIP: 0073:[<40000812>] CPU: 0 Not tainted ESP: 007b:bfd8359c EFLAGS: 00200212
    Not tainted
EAX: ffffffda EBX: 08059be8 ECX: 00000054 EDX: bfd835cc
ESI: 08059bd8 EDI: 40166ff4 EBP: bfd835a8 DS: 007b ES: 007b
082fcaf8:  [<08076e4d>] show_regs+0xed/0x120
082fcb14:  [<0805f5cc>] panic_exit+0x2c/0x50
082fcb24:  [<0809c7de>] notifier_call_chain+0x3e/0x70
082fcb4c:  [<0809c863>] atomic_notifier_call_chain+0x23/0x30
082fcb5c:  [<08281348>] panic+0x8b/0x167
082fcb84:  [<0805f282>] segv+0x1e2/0x2b0
082fcc3c:  [<0805f391>] segv_handler+0x41/0x60
082fcc5c:  [<0806fa54>] sig_handler_common+0x54/0xa0
082fccd8:  [<0806fbf7>] sig_handler+0x27/0x50
082fcce8:  [<0806fe4c>] handle_signal+0x5c/0xa0
082fcd0c:  [<080721c8>] hard_handler+0x18/0x20
082fcd1c:  [<b7773400>] 0xb7773400

There's an ~ 257 MB core file now in my $HOME dir.

-- 
MfG/Kind regards
Toralf Förster

pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3


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Re: [uml-devel] UML kernel crash of v2.6.36-rcX kernel

[Toralf Förster]

I can reproduce this behaviour with an UML kernel linux-v2.6.36-rc7-153-
g0acc1b2 if I start the UML guest (an almost stable Gentoo) and then run from 
the host system (Gentoo too) this:
§> wget http://n22_uml/phpsysinfo/
- where n22_uml is the guest and the side is an PHP application : 
http://phpsysinfo.sourceforge.net/

It is not related to PHP and/or apache b/c phpmyadmin works fine. I argue that 
sth is wrong with the reading of /proc and/sys files b/c that is the main part 
of phpsysinfo.

Furthermore it is a regression b/c 2.6.35 UML kernel works fine.

Here's the kernel info :

 * Starting local ...                                                                                                 
[ ok ]
Kernel panic - not syncing: Kernel mode fault at addr 0x4, ip 0x80dc41a
082ecb44:  [<0827380b>] dump_stack+0x22/0x24
082ecb5c:  [<08273870>] panic+0x63/0x167
082ecb84:  [<0805e282>] segv+0x1e2/0x2b0
082ecc3c:  [<0805e391>] segv_handler+0x41/0x60
082ecc5c:  [<0806ea54>] sig_handler_common+0x54/0xa0
082eccd8:  [<0806ebf7>] sig_handler+0x27/0x50
082ecce8:  [<0806ee4c>] handle_signal+0x5c/0xa0
082ecd0c:  [<080711c8>] hard_handler+0x18/0x20
082ecd1c:  [<b7862400>] 0xb7862400


EIP: 0073:[<40000812>] CPU: 0 Not tainted ESP: 007b:bfba8c6c EFLAGS: 00000212
    Not tainted
EAX: ffffffda EBX: 08059be8 ECX: 00000054 EDX: bfba8c9c
ESI: 08059bd8 EDI: 40166ff4 EBP: bfba8c78 DS: 007b ES: 007b
082ecaf8:  [<08075e4d>] show_regs+0xed/0x120
082ecb14:  [<0805e5cc>] panic_exit+0x2c/0x50
082ecb24:  [<08099c1e>] notifier_call_chain+0x3e/0x70
082ecb4c:  [<08099ca3>] atomic_notifier_call_chain+0x23/0x30
082ecb5c:  [<08273898>] panic+0x8b/0x167
082ecb84:  [<0805e282>] segv+0x1e2/0x2b0
082ecc3c:  [<0805e391>] segv_handler+0x41/0x60
082ecc5c:  [<0806ea54>] sig_handler_common+0x54/0xa0
082eccd8:  [<0806ebf7>] sig_handler+0x27/0x50
082ecce8:  [<0806ee4c>] handle_signal+0x5c/0xa0
082ecd0c:  [<080711c8>] hard_handler+0x18/0x20
082ecd1c:  [<b7862400>] 0xb7862400

Terminated

-- 
MfG/Kind regards
Toralf Förster

pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3


------------------------------------------------------------------------------
Beautiful is writing same markup. Internet Explorer 9 supports
standards for HTML5, CSS3, SVG 1.1,  ECMAScript5, and DOM L2 & L3.
Spend less time writing and  rewriting code and more time creating great
experiences on the web. Be a part of the beta today.
http://p.sf.net/sfu/beautyoftheweb
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