Opening screens crash after July update

Since installing the July update I have had intermittent crashes when trying to open 320x240 resolution screens. The result is a black screen with a two-pixel high bar along the top which fades between grey and white repeatedly.

I can reproduce it quite easily by running ASp in full screen mode. I have an ATI Radeon 7000.

Here is the crashlog:

Dump of context at 0xEFE27B70
Trap type: DSI exception
Machine State (raw): 0x0000F030
Machine State (verbose): [ExtInt on] [User] [FPU on] [IAT on] [DAT on]
Instruction pointer: in module Kickstart/rtg.library+0x00053BA4 (0x016CF644)
Crashed process: Apps:Emulators/ASp/ASp (0x6A3DF640)
0: 0000000A 6A336C40 00000000 6B940C81 80B352C1 00000001 016C0F20 00000002
8: 000000FF CCCCCCCD 0000000C 00000009 016D0000 6A336EE0 01E50000 01E50000
16: 00000FFF 80000000 0000000E 00000001 016E14D4 00000001 00000001 000000FF
24: 016A7B34 016CF680 00000100 FFFFFFFF 00000180 80B352C0 6B940D80 00000000
CR: 44004028 XER: 20000000 CTR: 00000001 LR: 016CF6A0
DSISR: 40000000 DAR: 6B940C80

FP0 : FFF8000082028000 40019999A0000000 3FDD1758E0000000 0000000000000000
FP4 : 0000000000000000 0000000000000000 0000000000000000 0000000000000000
FP8 : 0000000000000000 0000000000000000 0000000000000000 40DFFFC000000000
FP12: 40E0000000000000 4330000080000000 0000000000000000 0000000000000000
FP16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
FP20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
FP24: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
FP28: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
FPSCR: 82028000
DSI verbose error description: Access not found in hash or BAT (page fault)
Access was a load operation

Registers pointing to code:
r6 : native kernel module Kickstart/rtg.library+0x00045480
r12: native kernel module Kickstart/rtg.library+0x00054560
r20: native kernel module Kickstart/ATIRadeon.chip+0x00005F74
r24: native kernel module Kickstart/rtg.library+0x0002C094
r25: native kernel module Kickstart/rtg.library+0x00053BE0
ip : native kernel module Kickstart/rtg.library+0x00053BA4
lr : native kernel module Kickstart/rtg.library+0x00053C00
ctr: unknown (0x00000001)

Stack Backtrace:
native kernel module Kickstart/rtg.library+0x00053BA4
native kernel module Kickstart/rtg.library+0x00053BA4
native kernel module Kickstart/rtg.library+0x00045480
native kernel module Kickstart/rtg.library+0x000354D4
native kernel module Kickstart/rtg.library+0x0002B850
native kernel module Kickstart/rtg.library+0x0002C168
native kernel module Kickstart/rtg.library+0x00030D08
native kernel module Kickstart/rtg.library+0x000012A8
native kernel module Kickstart/graphics.library.kmod+0x00021634
native kernel module Kickstart/graphics.library.kmod+0x00004428
native kernel module Kickstart/kernel+0x0004F034
module Apps:Emulators/ASp/ASp at 0x6A35C1DE (section 0 @ 0x41D6)

Disassembly of crash site:
016CF634: 54A507BE rlwinm r5,r5,0,30,31
016CF638: 2C850000 cmpwi cr1,r5,0
016CF63C: 41A6FF48 beq- cr1,0x16CF584
016CF640: 7CA903A6 mtctr r5
>016CF644: 8CA3FFFF lbzu r5,-1(r3)
016CF648: 9CA4FFFF stbu r5,-1(r4)
016CF64C: 4200FFF8 bdnz+ 0x16CF644
016CF650: 38210010 addi r1,r1,16
016CF654: 4E800020 blr
016CF658: A563FFFE lhzu r11,-2(r3)
Stack pointer (0x6A336C40) is inside bounds
Redzone is OK (4)

68k register dump
DATA: 6A17E7B0 80000010 00000040 00009E80 37DFFA6C 00082883 0023003C FFD70001
ADDR: 6A17E7DC 6FF28750 6A18CE40 6A17DCCC 6A30B0C4 01E42194 6FFB4420 6A336FDC
----> 6FF28750 - "Apps:Emulators/ASp/ASp" Hunk 0003 Offset 00000748 (SegList: 0x1A8D6001)
----> 01E42194 - "Kickstart/dos.library.kmod" Hunk 0001 Offset 00000790

It turns out that this is a bug which occurs when using SOFTSPRITE. Disable it, and the problems go away (including other crashes I'd attributed to buggy software or audio/network problems).

@Chris

Which version of rtg.library do you have installed? Do you use truecolor pointers?

@srupprecht

rtg.library 41.4288 (12/12/2006)

I don't use true-colour pointers, as they are a bit jumpy here (gfx card doesn't support interrupts on OS4)

Chris