SD-corrupting crash log

EDuke32 2.0.0devel r4821 (32-bit) C++ build
Compiled Dec 18 2014 03:00:53
Using sd:/ for game data
Using sd:/apps/eduke32/ for game data
	Exception: DSI

	GPR00 8006C854 GPR08 80896F80 GPR16 00000000 GPR24 00000000
	GPR01 80E40170 GPR09 00000001 GPR17 00000000 GPR25 00000000
	GPR02 802B09BC GPR10 00000002 GPR18 00000000 GPR26 00000000
	GPR03 00000001 GPR11 80E401E8 GPR19 00000000 GPR27 00000000
	GPR04 00000001 GPR12 48200088 GPR20 00000000 GPR28 00000000
	GPR05 00000002 GPR13 802C5600 GPR21 00000000 GPR29 00000000
	GPR06 00000002 GPR14 00000000 GPR22 00000000 GPR30 811542B0
	GPR07 802785EC GPR15 00000000 GPR23 00000000 GPR31 80E40170
	LR 801846A0 SRR0 801841fc SRR1 0000b032 MSR 00001000
	DAR 00000001 DSISR 04000000

	STACK DUMP:
	801841fc --> 801846a0 --> 8006d890 --> 8006ec68 -->
	80033d38 --> 801bb494 --> 800043c0 --> 8023b614 -->
	8023b5c8

	CODE DUMP:
	801841fc:  89290000 5529063E 913F000C 813F000C
	8018420c:  2F890000 7D200026 5529FFFE 69290001
	8018421c:  5529063E 2F890000 409EFFB0 813F0008