Linux applications core if running (k)qemu

Chagin Dmitry dchagin at freebsd.org
Sat Sep 6 10:47:08 UTC 2008


On Tue, Sep 02, 2008 at 03:56:33PM -0500, Sean C. Farley wrote:
> On Sat, 30 Aug 2008, Chagin Dmitry wrote:
> 
> >On Fri, Aug 29, 2008 at 05:29:09PM -0500, Sean C. Farley wrote:
> >>I am having trouble with kqemu.ko and linux.ko.  If I run qemu with
> >>the following command, Linux applications (chroot, acroread, ls) will
> >>start core dumping:
> >>    qemu-system-x86_64 -m 512 \
> >>    -drive file=/usr/QEMU/WinXP/c.img,if=ide,media=disk -boot c \
> >>    -std-vga -parallel none -serial none -monitor stdio \
> >>    -net nic,model=e1000 -net tap,ifname=tap0,script=no -localtime
> >>
> >>Loading kqemu.ko does not cause the problem, but the cores start a
> >>little after WinXP starts running.  Unloading kqemu.ko does not help;
> >>the cores still happen but more randomly.  I even tried unloading all
> >>linux modules and reloading them without luck.  It takes a reboot.
> >>
> >>Packages:
> >>qemu-devel-0.9.1s.20080620_1
> >>kqemu-kmod-devel-1.4.0.p1
> >>linux_base-f8-8_4
> >>
> >>sysctl:
> >>compat.linux.osrelease: 2.6.16
> >>
> >>dmesg:
> >>kqemu version 0x00010400
> >>kqemu: KQEMU installed, max_locked_mem=1792492kB.
> >>
> >>System is 7-STABLE as of r181963 with or without the patch to fix RT
> >>signals from Chagin.
> >
> >Interestingly... Sean, can you provide ktrace/kdump log of coring
> >apps?  thnx!
> 
> Here they are (good and bad):
> http://www.farley.org/freebsd/tmp/linuxulator_vs_kqemu/
> 
> The good trace is after the bad trace.  I just kept running ktrace
> /compat/linux/bin/date over and over until I got a good trace.  Before
> loading kqemu and running qemu, there were no core dumps.  Also, I
> compared two bad traces and they were basically the same except for PID
> and a couple of addresses (still very close in value).
> 

Most likely it is a tls problem again, some days ago kib@ has made MFC
r182684, probably it will help..

thnx!

-- 
Have fun!
chd


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