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Re: [Qemu-devel] [Bug 1094564] Re: images used as scsi disks not readabl

From: Peter Maydell
Subject: Re: [Qemu-devel] [Bug 1094564] Re: images used as scsi disks not readable (qemu-system-arm, macos 10.8)
Date: Wed, 15 May 2013 21:18:09 +0100

On 15 May 2013 19:02, Joss Reeves <address@hidden> wrote:
> Thanks so much for the patch and including me on the thread. I can
> confirm that it did fix the problem running on a Linux host, but the OS
> X bug cited by myself and the OP still remains elusive. It's rather
> puzzling as I pulled from HEAD and built using the same options on both.

QEMU itself actually hangs in my tests (the main loop is waiting
to lock the iothread but it never does; the cpu thread seems to
be stuck trying to do a bdrv_aio_cancel for the scsi device model).
This should never happen, regardless of what the guest does...

I suspect that if you configure on linux with --with-coroutine=sigaltstack
you might then find they both behave the same (MacOSX can't do the
ucontext coroutines we default to on linux). OTOH it might also
involve some of MacOSX's slightly different signal behaviour.

I'll continue to prod, though past experience is that MacOSX
gdb is weirdly broken and things behave differently when run
under it, which doesn't help :-(

-- PMM

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