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[Qemu-devel] Help with deadlock when using sound

From: Programmingkid
Subject: [Qemu-devel] Help with deadlock when using sound
Date: Wed, 6 May 2015 12:40:48 -0400

When I try to use the pcspk sound hardware, QEMU freezes and uses 100% of the 
cpu time. This is the command I use:

qemu-system-i386 -cdrom <anything you wan here> -soundhw pcspk

This looks like a deadlock situation because some unknown code called 
qemu_mutex_lock(). Here is the stack trace at the freeze:

(gdb) bt
#0  0x00007fff824e2db6 in semaphore_wait_trap ()
#1  0x00007fff824e8417 in pthread_mutex_lock ()
#2  0x0000000100267199 in qemu_mutex_lock (mutex=<value temporarily 
unavailable, due to optimizations>) at util/qemu-thread-posix.c:73
#3  0x003c44016e95153b in ?? ()

My host is Mac OS 10.6.8. My guest isn't really anything. I have used Windows 
XP before but it isn't necessary to reproduce the problem. 

The ?? is what appears to be the problem. I can't even print instructions at 
that address. Any ideas as to what is calling the qemu_mutex_lock() function 
could help.

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