Qemu and smp=2

Qemu is emulator which allows to run (for example) full Linux distro in another Linux.
I am using Slackware 10.2 with 2.6.16.1 and SUSE 10.0 with 2.6.16.1 as host systems, I installed base Arch Linux 0.7.1 inside them. I was able to configure networking and everything is working great.
But I need speed. Of course I am using kqemu, I also increased memory from 128MB to 512MB (and size of /dev/shm).
Then I found "smp" option.
Machine with SUSE has hyperthreading enabled (Pentium IV), machine with Slackware has dual-core CPU (Pentium D).
When I run qemu with Arch Linux disk image and smp=2 option I see segmentation fault during boot and boot process stops inside busybox, only / is mounted (I have three partitions: /, /usr and /home), I have no idea what segfaulted.
So I tried to run Fedora 5 install with smp=2 and it booted without any problems.
Could you try to install/run Arch Linux inside Qemu (may be Arch inside Arch) and try smp=2 option? I don't have SMP computer at home...
Can you reproduce segfaults during boot? Do you know how to fix them?

I've updated kernel and glibc, now it works.

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