[uml-devel] uml 2.6.0-test9 crash

["roland" <for_spam@gmx.de>]

hi !´
i think , i`m able to crash my uml. :(

i did some stress-testing with my uml-2.6.0-test9 on 2.6.0-test9-skas host and i
unfortunately seem able to crash it very easily.

this was the way i recognized it:
first i executed
while true;do find /;done >/dev/zero &
several times and all worked well.
watched that with "top" inside the uml and found dozens of "finds" sharing the
cpu as expected(spending most of their time on system calls indeed).
on host, cpu usage of uml went to ~99% - all fine so far.

then i thought: mhhhh - ok - eat THIS:
while true;do dd if=/dev/zero of=test.dat bs=1k count=10000;done &

after executing this, my uml got stuck. no output, no response to input - even a
ping to the uml didn`t´give back a sign of life. the uml didn`t crash or panic - it
just gets stuck and unresponsive - uml process remains at 99% on the host.

at a second, third, fourth try, i isolated the problem a little bit:
one or two non looped "dd if=/dev/zero of=test.dat bs=1k count=10000" just are enough
to produce the same result.(under 2.6.0test9-skas-host and ALSO under 2.4.22-99-default
suse9 host, rootfs inside uml is suse9)

is anybody able to reproduce this?
if so - what do do further for analyzing?
i could make the uml downloadable and could send some output from strace (if i attach strace
to the remaining "99% cpu hog", it exits very quickly with a SIGALARM)

maybe an uml bug or even an issue for lkml?

regards
roland



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