Bug#891674: More info

[<Peter.Chubb@data61.csiro.au>]

I built Xorg from source so I could get debugging symbols.

The crash is in  xf86VGAarbiterInit(), when it calls
pci_device_vgaarb_init().  This function can read /dev/vga_arbiter
which ordinary users cannot.

# head -1 < /dev/vga_arbiter 
count:1,PCI:0000:65:00.0,decodes=io+mem,owns=none,locks=none(0:0)

pci_sys->devices is null.

The problem appears to be a bad scan format in
    line 160 of linux_sysfs.c
       sscanf(devices[i]->d_name, "%04x:%02x:%02x.%1u",

ls /sys/bus/pci/devices shows devices with a BUS > 0xffff taking 5
digits.


ls /sys/bus/pci/devices
0000:00:00.0  0000:00:1f.2  0000:16:0e.4  0000:64:09.0  0000:64:0d.1
0000:00:04.0  0000:00:1f.3  0000:16:0e.5  0000:64:0a.0  0000:64:0d.2
0000:00:04.1  0000:00:1f.4  0000:16:0e.6  0000:64:0a.1  0000:64:0d.3
0000:00:04.2  0000:00:1f.6  0000:16:0e.7  0000:64:0a.2  0000:65:00.0
0000:00:04.3  0000:02:00.0  0000:16:0f.0  0000:64:0a.3  0000:65:00.1
0000:00:04.4  0000:16:05.0  0000:16:0f.1  0000:64:0a.4  0000:b2:05.0
0000:00:04.5  0000:16:05.2  0000:16:1d.0  0000:64:0a.5  0000:b2:05.2
0000:00:04.6  0000:16:05.4  0000:16:1d.1  0000:64:0a.6  0000:b2:05.4
0000:00:04.7  0000:16:08.0  0000:16:1d.2  0000:64:0a.7  0000:b2:05.5
0000:00:05.0  0000:16:08.1  0000:16:1d.3  0000:64:0b.0  0000:b2:12.0
0000:00:05.2  0000:16:08.2  0000:16:1e.0  0000:64:0b.1  0000:b2:12.1
0000:00:05.4  0000:16:08.3  0000:16:1e.1  0000:64:0b.2  0000:b2:12.2
0000:00:08.0  0000:16:08.4  0000:16:1e.2  0000:64:0b.3  0000:b2:15.0
0000:00:08.1  0000:16:08.5  0000:16:1e.3  0000:64:0c.0  0000:b2:16.0
0000:00:08.2  0000:16:08.6  0000:16:1e.4  0000:64:0c.1  0000:b2:16.4
0000:00:14.0  0000:16:08.7  0000:16:1e.5  0000:64:0c.2  0000:b2:17.0
0000:00:14.2  0000:16:09.0  0000:16:1e.6  0000:64:0c.3  10000:00:02.0
0000:00:16.0  0000:16:09.1  0000:64:00.0  0000:64:0c.4  10000:00:03.0
0000:00:17.0  0000:16:0e.0  0000:64:05.0  0000:64:0c.5  10000:01:00.0
0000:00:1c.0  0000:16:0e.1  0000:64:05.2  0000:64:0c.6
0000:00:1c.6  0000:16:0e.2  0000:64:05.4  0000:64:0c.7
0000:00:1f.0  0000:16:0e.3  0000:64:08.0  0000:64:0d.0



-- 
Dr Peter Chubb         Tel: +61 2 9490 5852      http://ts.data61.csiro.au/
Trustworthy Systems Group                           Data61 (formerly NICTA)