Re: [uml-user] Kernel panic under load

[Myrtle M. <xr...@ho...>]

Hi,
I've found time to run some load tests again, this time
with the latest CVS version (2.4.0) on a 2.2.18 host (ext2 filesystem), and 
can still consistently crash UML.
I've attached the perl-asp file I use on the server side to generate the 
crash (the UML is running on the debian rootfs, 64M memory and 64M swap, 
Apache 1.3.14, mysql 2.23.28, libapache-mod-perl 1.24.01, libdbi-perl 1.14 
and nodeworks' perl-asp 2.03). For networking I'm using um_eth_serv. The 
host machine is configured with "ifconfig tap0 192.168.66.1 arp up" and ip 
forwarding enabled and the UML with "ifconfig eth0 192.168.66.2 up" and 
192.168.66.1 as the default route.
I'm generating load with siege 1.01 ;
The command I'm using is
"siege -c 50 -u 'http://192.168.66.2/test/index.asp?nowrite=1' -v -t 100 -d 
1" (where 192.168.66.2 is the IP of the UML).
The crash occurs within 30 seconds. The panic messages vary. I've gotten:
"Detaching pid xxxxx"
"Seg fault in signals"
"Kernel panic: Double fault on 0xbedffc44 - panicing because it wasn't fixed 
the first time"

The crash is completely consistent; I haven't managed to pass a minute under 
load without crashing.
If you can't recreate it, try running the load from a different machine 
(than the one running UML) - otherwise
when the UML takes more CPU the load will go down.

   TIA,
         -Tal


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