RE: [Xen-users] qemu-dm crashing under 3.1

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> That would make it a lot more readable - you could try just "objdump
-d
> qemu-dm" and see if that gives you a clue of which function it's in,
but
> using a debug build would make it much more readable.
> 
> You can re-build JUST qemu-dm by going to .../tools/ioemu and doing
> "make clean all" - first modify the CFLAGS in makefile with "CFLAGS +=
> -g" to add debug symbols. Then copy your new qemu-dm to
> /usr/lib[64]/xen/bin on the target machine (if that's not the same
> machine you're building the code on).
> 

Because it was a debian build it needed a bit of persuasion...

Here's the output (excuse the line wrapping):

"
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 47890972539360 (LWP 4609)]
0x0000000000409b25 in main_loop_wait (timeout=10)
    at
/usr/local/src/xen/xen-3.1-3.1.0-rc10+hg15040/debian/build/source/tools/
ioemu/vl.c:5224
5224                if (ioh->fd_write && FD_ISSET(ioh->fd, &wfds)) {

(gdb) bt
#0  0x0000000000409b25 in main_loop_wait (timeout=10)
    at
/usr/local/src/xen/xen-3.1-3.1.0-rc10+hg15040/debian/build/source/tools/
ioemu/vl.c:5224
#1  0x000000000046c041 in main_loop ()
    at
/usr/local/src/xen/xen-3.1-3.1.0-rc10+hg15040/debian/build/source/tools/
ioemu/target-i386-dm/helper2.c:628
#2  0x000000000040b6d6 in main (argc=21, argv=0x7fff2fa03468)
    at
/usr/local/src/xen/xen-3.1-3.1.0-rc10+hg15040/debian/build/source/tools/
ioemu/vl.c:6903

(gdb) print ioh
$1 = (IOHandlerRecord *) 0x9224b0
(gdb) print ioh->fd_write
$2 = (IOHandler *) 0x4691e0 <vnc_client_write>
(gdb) print ioh->fd
$3 = 9932400
(gdb) print wfds
$4 = {fds_bits = {0 <repeats 16 times>}}
(gdb) print &wfds
$5 = (fd_set *) 0x7fff2fa00760
(gdb)
"

The only thing that strikes me as odd is the value of ioh->fd... isn't
that a little bit high for a fd number?

James

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