On 10/20/2009 08:39 PM, Mark McLoughlin wrote:
On Thu, 2009-10-08 at 22:37 +0200, Michael S. Tsirkin wrote:
With commit ee3993069ff55fa6f1c64daf1e09963e340db8e4,
"posix-aio-compat: avoid signal race when spawning a thread"
winxp installation on a raw format file fails
during disk format, with a message "your
disk may be damaged".
This commit moved signal mask from aio thread to creating thread.
It turns out if we keep the mask in aio thread as well, the problem
disappears. It should not be needed, but since this is harmless, let's
keep it around until someone inclined to debug pthread library internals
can check this issue.
While we are at it, convert sigprocmask to pthread_sigmask
as per posix.
FWIW, I just started hitting a boot hang with qemu.git and --enable-kvm
on a Fedora 11 machine with a Fedora 11 guest.
I bisected it back to malc's commit, found this thread, applied
Michael's patch and confirmed that it fixes the problem for me too.
If anybody can send me the output of compiling the "strange" file with
and without the patch, both with "-fdump-tree-all -fdump-rtl-all -O2
--save-temps -g" flags, I could try debugging it in GCC.
It will be huge, so bz/gz/lzip it.
Paolo
