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Re: [Qemu-devel] [PATCH] vl: take iothread lock very early

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH] vl: take iothread lock very early
Date: Tue, 03 Mar 2015 18:32:39 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 03/03/2015 18:19, Oliver Francke wrote:
> #0  __GI_exit (status=1) at exit.c:104
> #1  0x000055555575cf15 in os_daemonize () at os-posix.c:227
> #2  0x0000555555773f2e in main (argc=50, argv=0x7fffffffe0d8,
> envp=0x7fffffffe270) at vl.c:3770
> compiled with "--enable-debug" and in gdb "b exit". Not a coder, so if
> this is _not_ sufficient, please give me some adivce ;)

Try removing -daemonize (hmm, that might actually fix the bug).  You
should not need "b exit", because the error is a SIGABRT and gdb stops
automatically.  The fix could be something like this:

diff --git a/vl.c b/vl.c
index e1ffd0a..af61835 100644
--- a/vl.c
+++ b/vl.c
@@ -3759,7 +3759,9 @@ int main(int argc, char **argv, char **envp)


+    qemu_mutex_unlock_iothread();
+    qemu_mutex_lock_iothread();

     if (qemu_init_main_loop(&main_loop_err)) {


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