Bug#547496: backtrace for another crash...

[Thomas Koenig <tkoenig@netcologne.de>]

On Mon, 2009-09-28 at 16:58 +0200, Julien Cristau wrote:

> hw/xfree86/os-support/linux/../shared/sigio.c:110 seems to be:
>     SYSCALL (r = select (xf86SigIOMaxFd, &ready, 0, 0, &to));
> where SYSCALL() is defined as:
> #define SYSCALL(call) while(((call) == -1) && (errno == EINTR))
> 
> No idea how this would segfault...

The way I read the backtrace:

#8  0x080b77b5 in xf86SIGIO (sig=29)
    at ../../../../../hw/xfree86/os-support/linux/../shared/sigio.c:110
        i = <value optimized out>
        ready = {fds_bits = {3072, -65536, 0, 0, 65535, 0, -65536,
16711935, 16711935, 
            8454143, 8388736, -65408, 0, 0, 16777215, 16711935, -65281,
16416, 1075839871, 
            0, 0, 0, 0, 0, 8064, 0, -2102793, 0, 65535, 0, -1209998559,
0}}
        to = {tv_sec = 0, tv_usec = 0}
        save_errno = 0
        r = -1
#9 <signal handler called> 
No symbol table info available.
#10 0xb7bea5fd in memmove () from /lib/i686/cmov/libc.so.6
No symbol table info available.
#11 0x08133682 in FlushClient (who=0x8b18ec8, oc=0x8b18e58,
__extraBuf=0x868fba8, 
    extraCount=51876) at ../../os/io.c:959
        before = <value optimized out>
        remain = <value optimized out>
        i = <value optimized out>
        len = <value optimized out>

memmove segfaults due to invalid arguments, the signal handler just gets
called afterwards.