Re: [Qemu-devel] PPC* and Sparc32 crash

[Avi Kivity <avi@redhat.com>]

On 08/25/2011 08:33 PM, Blue Swirl wrote:
> (gdb) bt
> #0  0x00007ffff3da2165 in *__GI_raise (sig=<value optimized out>)
>      at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
> #1  0x00007ffff3da4f70 in *__GI_abort () at abort.c:92
> #2  0x00007ffff3d9b2b1 in *__GI___assert_fail (
>      assertion=0x5c7390 "info->qdev.size>= sizeof(SysBusDevice)",
>      file=<value optimized out>, line=0x9c,
>      function=0x5c73c0 "sysbus_register_withprop") at assert.c:81
> #3  0x000000000052e000 in sysbus_register_withprop (info=<value optimized out>)
>      at /src/qemu/hw/sysbus.c:156
> #4  0x000000000041d9c3 in module_call_init (type=<value optimized out>)
>      at /src/qemu/module.c:78
> #5  0x0000000000518b64 in main (argc=<value optimized out>,
>      argv=<value optimized out>, envp=<value optimized out>)
>      at /src/qemu/vl.c:3241
> (gdb) up 3
> #3  0x000000000052e000 in sysbus_register_withprop (info=<value optimized out>)
>      at /src/qemu/hw/sysbus.c:156
> 156         assert(info->qdev.size>= sizeof(SysBusDevice));
> (gdb) p *info
> Cannot access memory at address 0x0
> (gdb) p info
> $1 =<value optimized out>

-O1 fixes that.

> (gdb) up
> #4  0x000000000041d9c3 in module_call_init (type=<value optimized out>)
>      at /src/qemu/module.c:78
> 78              e->init();
> (gdb) p *e
> $2 = {type = MODULE_INIT_BLOCK,
>    init = 0x53cf50<sun4c_intctl_register_devices>, node = {
>      tqe_next = 0x1051130, tqe_prev = 0x10510b0}}

static SysBusDeviceInfo sun4c_intctl_info = {
     .init = sun4c_intctl_init1,
     .qdev.name  = "sun4c_intctl",
     .qdev.size  = sizeof(Sun4c_INTCTLState),
     .qdev.vmsd  = &vmstate_sun4c_intctl,
     .qdev.reset = sun4c_intctl_reset,
};

typedef struct Sun4c_INTCTLState {
     SysBusDevice busdev;
     ...
}

so the code looks fine.  Can you dig deeper?  Did something stomp on 
qdev.size?

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.