On Mon, 22 Nov 2004, Manish Lachwani wrote:
I tried out the patch on a MIPS Malta board (24Kc core). Compiled fine and booted fine as well. On bootup, I see:
... Synthesized TLB handler (26 instructions). ...
This should be 21 instructions -- please get an update from the CVS tree for a fix I applied yesterday. You run with the BCM1250 workaround enabled.
Maciej
Hello Maciej,
Thanks for the info. I got the latest sources from cvs. Bootlog shows:
... Synthesized TLB handler (21 instructions). ...
However, the crash still occurs. I dont think your patch was intended to fix the problem that I see below (resulting in crash).
I will try to debug this now.
gcc -D__KERNEL__ -I/root/2.4.19/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -fomit-frame-pointer -DGEMDEBUG_TRACEBUFFER -I /root/2.4.19/include/asm/gcc -G 0 -mno-abicalls -fno-pic -pipe -mips2 -Wa,--trap -DKBUILD_BASENAME=main -c -o init/main.o init/main.c
Data bus error, epc == 801f83b8, ra == 80323f04
Oops in arch/mips/kernel/traps.c::do_be, line 330[#1]:
Cpu 0
$ 0 : 00000000 80000000 83fffb24 00000000
$ 4 : 83ffff04 80612414 000000dc 00000000
$ 8 : 73696874 6c6f7362 20657475 72707865
$12 : 69737365 81141d60 0000000a 00006e6f
$16 : 80612034 83fffb24 000004dc 0000f45d
$20 : 81136660 00000000 83fffb24 00ff00ff
$24 : 0000001c 00000001
$28 : 8114c000 8114d6c0 00000000 80323f04
Hi : 10621125
Lo : f1a9c6d0
epc : 801f83b8 both_aligned+0x40/0x74 Not tainted
ra : 80323f04 csum_partial_copy_nocheck+0x44/0x64
Status: 1000fc03 KERNEL EXL IE
Cause : 0080001c
PrId : 00019360
Modules linked in:
Process rpciod (pid: 12, threadinfo=8114c000, task=810f7060)
Stack : 10008000 80100744 00000000 00000000 000004dc 000004dc 000004dc 00000000
802a7464 1000fc00 00000000 80383e34 80383e34 00000003 00000001 00000000
0000dcf9 83fff000 000004dc 000004dc 0000106c 00000b90 81136660 00013fb7
83fffb24 00ff00ff 00000b24 802a7618 81136660 804f3280 81114600 802a5b64
00000000 00000001 00000000 00000000 0000006c 00001000 8114d7e8 00001000
...
Call Trace:
[<80100744>] mipsIRQ+0x104/0x180
[<802a7464>] skb_copy_and_csum_bits+0x78/0x2bc
[<802a7618>] skb_copy_and_csum_bits+0x22c/0x2bc
[<802a5b64>] kfree_skbmem+0x24/0x34
[<80312144>] skb_read_and_csum_bits+0x0/0xb4
[<80312188>] skb_read_and_csum_bits+0x44/0xb4
[<8010e4b8>] __flush_dcache_page+0x90/0xa4
[<8031e814>] xdr_partial_copy_from_skb+0x190/0x1dc
[<8031226c>] csum_partial_copy_to_xdr+0x74/0x134
[<80312454>] udp_data_ready+0x128/0x230
...
From the disassembly:
801f8378 <both_aligned>: 801f8378: 00064142 srl t0,a2,0x5 801f837c: 1100001b beqz t0,801f83ec <cleanup_both_aligned> 801f8380: 30d8001f andi t8,a2,0x1f 801f8384: cca00060 pref 0x0,96(a1) 801f8388: cc810060 pref 0x1,96(a0) 801f838c: 00000000 nop 801f8390: 8ca80000 lw t0,0(a1) 801f8394: 8ca90004 lw t1,4(a1) 801f8398: 8caa0008 lw t2,8(a1) 801f839c: 8cab000c lw t3,12(a1) 801f83a0: 24c6ffe0 addiu a2,a2,-32 801f83a4: 8cac0010 lw t4,16(a1) 801f83a8: 8caf0014 lw t7,20(a1) 801f83ac: ac880000 sw t0,0(a0) 801f83b0: ac890004 sw t1,4(a0) 801f83b4: 8ca80018 lw t0,24(a1) 801f83b8: 8ca9001c lw t1,28(a1) 801f83bc: 24a50020 addiu a1,a1,32 801f83c0: 24840020 addiu a0,a0,32 801f83c4: ac8affe8 sw t2,-24(a0) 801f83c8: ac8bffec sw t3,-20(a0) 801f83cc: ac8cfff0 sw t4,-16(a0) 801f83d0: ac8ffff4 sw t7,-12(a0) 801f83d4: ac88fff8 sw t0,-8(a0) 801f83d8: ac89fffc sw t1,-4(a0) 801f83dc: cca00100 pref 0x0,256(a1) 801f83e0: cc810100 pref 0x1,256(a0) 801f83e4: 14d8ffea bne a2,t8,801f8390 <both_aligned+0x18> 801f83e8: 00000000 nop
Thanks Manish Lachwani
