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Re: [Qemu-devel] x86_64 linux kernel doesn't boot with -icount enabled


From: Paolo Bonzini
Subject: Re: [Qemu-devel] x86_64 linux kernel doesn't boot with -icount enabled
Date: Tue, 08 Nov 2011 15:14:47 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1

On 11/08/2011 02:45 PM, Max Filippov wrote:
Hi.

I'm trying to run stock Debian 6.0 x86_64 kernel using qemu git head.
With the following command line it's ok (getting to rootfs mounting
and panics):

qemu-system-x86_64 -serial stdio -monitor null -nographic -kernel
/boot/vmlinuz-2.6.38-bpo.2-amd64 -append 'console=ttyS0 panic=1'

But once I add -icount option (have tried -icount 1, 2, 16, 256, auto,
the result is the same) qemu loops infinitely in the qemu_run_timers:

Is this a regression, either from 0.15 w/o iothread, or from something recent? Most backends are buggy with icount (with the embedded ones more likely to be reliable).

Paolo




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