Hi,
I also got the Oops in same place.
My environment is:
o board: Pb1000 ( Au1000 eval. board )
o kernel: SGI version of 2.4.17
o root fs: nfs root
o userland: RedHat 7.1 got from SGI ftp site.
When rebuilding rpm package on the MIPS board, I also got error in
same place.
Today I compiled kernel with __wake_up_common not inline function, and
got same result. And also made kgdb version. I found that the line
p = curr->task;
made the memory violation. When trap occurs, gdb says
curr = 0xfffffffc
So here is the place of memory violation.
At Thu, 31 Jan 2002 18:09:29 -0800,
Matthew Dharm wrote:
> Unable to handle kernel paging request at virtual address fffffffc,
> epc == 8010b
> 1ec, ra == 8010b19c
> $0 : 00000000 b0045400 00000000 00000000 00000017 802d51cc 92bdc000
> 93e7d120
> $8 : 92bdc000 b0045401 00000000 00000000 00000000 00000000 00000088
> 00000000
> $16: 00000000 b0045400 00000001 b0045401 802de998 802dad88 00000001
> 92ce1160
> $24: 00000000 2acce4e0 92bdc000 92bddd68 92bddd68
> 8010b19c
> epc : 8010b1ec Not tainted
> Using defaults from ksymoops -t elf32-tradbigmips -a mips:3000
> Status: b0045402
> Cause : 80008008
> Process bladeenc (pid: 660, stackpage=92bdc000)
> Stack: 92bddd68 92bddd68 92bddd68 92bddd68 802df378 00000001 00000000
> 93ff8bf0
> 802df1fc 802df36c 000001d2 92bc4060 8012c588 8012c528 00001000
> 92bc4060
> 00000000 92bc4060 81018fc0 92ce1160 00000005 92bc4120 00001a55
> 93ff8bf0
> 92ce1160 0000001f 00001000 8012c180 81018fc0 92bc4120 00001a54
> 93ff8bec
> 80122aa0 80122af8 93f036c0 00000000 80170988 80170980 00000005
> 00001a50
> 92ce1160 ...
> Call Trace: [<8012c588>] [<8012c528>] [<8012c180>] [<80122aa0>]
> [<80122af8>] [<8
> 0170988>]
> [<80170980>] [<801233ec>] [<8012372c>] [<8012377c>] [<80126198>]
> [<80123d80>]
> [<80123c78>] [<801680dc>] [<8010703c>] [<8013290c>] [<80113158>]
> [<80106508>]
> [<80106508>]
> Code: 12400004 00000000 8e100000 <5614ffcc> 8e05fffc 40016000
> 32730001 3421
> 0001 38210001
>
> >>RA; 8010b19c <__wake_up+ec/198>
> >>PC; 8010b1ec <__wake_up+13c/198> <=====
> Trace; 8012c588 <__alloc_pages+d0/21c>
> Trace; 8012c528 <__alloc_pages+70/21c>
> Trace; 8012c180 <_alloc_pages+20/2c>
> Trace; 80122aa0 <page_cache_read+a0/11c>
> Trace; 80122af8 <page_cache_read+f8/11c>
> Trace; 80170988 <nfs_updatepage+218/314>
> Trace; 80170980 <nfs_updatepage+210/314>
> Trace; 801233ec <generic_file_readahead+174/1ec>
> Trace; 8012372c <do_generic_file_read+24c/51c>
> Trace; 8012377c <do_generic_file_read+29c/51c>
> Trace; 80126198 <generic_file_write+558/828>
> Trace; 80123d80 <generic_file_read+94/1a0>
> Trace; 80123c78 <file_read_actor+0/74>
> Trace; 801680dc <nfs_file_read+cc/ec>
> Trace; 8010703c <handle_IRQ_event+80/f4>
> Trace; 8013290c <sys_read+d8/130>
> Trace; 80113158 <sys_time+18/5c>
> Trace; 80106508 <stack_done+1c/38>
> Trace; 80106508 <stack_done+1c/38>
> Code; 8010b1e0 <__wake_up+130/198>
> 00000000 <_PC>:
> Code; 8010b1e0 <__wake_up+130/198>
> 0: 12400004 beqz s2,14 <_PC+0x14> 8010b1f4
> <__wake_up+144/198>
> Code; 8010b1e4 <__wake_up+134/198>
> 4: 00000000 nop
> Code; 8010b1e8 <__wake_up+138/198>
> 8: 8e100000 lw s0,0(s0)
> Code; 8010b1ec <__wake_up+13c/198> <=====
> c: 5614ffcc 0x5614ffcc <=====
This is MIPS2 code. If you use objdump to disassemble, add
-m mips:4600 option to get correct mnemonic.
And the cause register says exception occurred in delay slot, so:
> Code; 8010b1f0 <__wake_up+140/198>
> 10: 8e05fffc lw a1,-4(s0)
The memory violation occurs here.
Registers dump says s0 = 00000000, memory access to 0xfffffffc occurs
here.
> Code; 8010b1f4 <__wake_up+144/198>
> 14: 40016000 mfc0 at,$12
> Code; 8010b1f8 <__wake_up+148/198>
> 18: 32730001 andi s3,s3,0x1
> Code; 8010b1fc <__wake_up+14c/198>
> 1c: 34210001 ori at,at,0x1
> Code; 8010b200 <__wake_up+150/198>
> 20: 38210001 xori at,at,0x1
Thanks.
_._. __._ _ . ... _ .___ ._. _____ _... ._ _._ _.._. .____ _ . ... _
Kunihiko IMAI
