Re: kern/49707: i386 i915drmkms on 82845G/GL panic with Xorg intel driver

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

The following reply was made to PR kern/49707; it has been noted by GNATS.

From: "John D. Baker" <jdbaker%mylinuxisp.com@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: riastradh%NetBSD.org@localhost
Subject: Re: kern/49707: i386 i915drmkms on 82845G/GL panic with Xorg intel
 driver
Date: Sun, 31 Jan 2016 05:56:14 -0600 (CST)

 On Sun, 31 Jan 2016, John D. Baker wrote:
 
 >  I didn't get any more debugging symbols, but the resulting Xserver
 >  doesn't crash.  An initial trial under 'gdb' seemed not to produce a
 >  working display.  The screen was blank (the wscons cursor was not visible)
 >  but there was no X cursor.  Attempting to switch virtual terminals
 >  appeared not to work.  It reported receiving "SIGUSR1".
 >  
 >  Later, running 'X' normally, with the "-retro" option displayed the
 >  "root weave" pattern, and opening 'xterm -display :0' worked.
 
 Nevermind.  It was one of those rare flukes where it sponaneously started
 working.  After rebooting the machine, it crashes with Bus Error the
 same as before.  There's a little more debug information, but not much:
 
 (gdb) bt
 #0  0xbb31a7b0 in __kgem_bo_make_scanout (kgem=kgem@entry=0xbb787000, 
     bo=bo@entry=0xbb1c54e0, width=width@entry=1280, height=height@entry=1024)
     at kgem.c:4799
 #1  0xbb31b6ea in kgem_create_2d (kgem=kgem@entry=0xbb787000, width=1280, 
     height=1024, bpp=32, tiling=1, flags=530, flags@entry=16) at kgem.c:5448
 #2  0xbb323d94 in sna_pixmap_alloc_gpu (sna=sna@entry=0xbb787000, 
     pixmap=pixmap@entry=0xbb780740, flags=16, priv=<optimized out>)
     at sna_accel.c:1636
 #3  0xbb335537 in sna_pixmap_move_to_gpu (pixmap=pixmap@entry=0xbb780740, 
     flags=flags@entry=322) at sna_accel.c:4211
 #4  0xbb3661c1 in sna_pixmap_force_to_gpu (flags=258, pixmap=0xbb780740)
     at sna.h:722
 #5  sna_create_screen_resources (screen=0xbb76c000) at sna_driver.c:256
 #6  0x080e4d3e in ?? ()
 #7  0x08079c29 in ?? ()
 #8  0x081d7a76 in ?? ()
 #9  0x08064da4 in _start ()
 
 
 -- 
 |/"\ John D. Baker, KN5UKS               NetBSD     Darwin/MacOS X
 |\ / jdbaker[snail]mylinuxisp[flyspeck]com    OpenBSD            FreeBSD
 | X  No HTML/proprietary data in email.   BSD just sits there and works!
 |/ \ GPGkeyID:  D703 4A7E 479F 63F8 D3F4  BD99 9572 8F23 E4AD 1645