Re: Exception while loading kernel
Giuseppe Sacco wrote:
> Hi all,
> compiled the latest kernel 2.6.22.4 using the .config from Debian
> linux-image-2.6.22-1-r5k_ip32 and activating CONFIG_NFSD_V4 and a few
> network device drivers.
> The command I used was:
>
> $ fakeroot make-kpkg --revision 2:2.6.22 \
> --append-to-version -1gs-r5k-ip32 --arch-in-name buildpackage
>
> When I boot an O2 r5k with this kernel, I get this error message:
> ---------------------------------------------------------------------------
> Loading 64-bit executable
Have you tried the ELF32 variant (vmlinux.32)?
> Loading program segment 1 at 0x80005000, offset=0x0 4000, size = 0x0 4f8086
> 5dc000 (cache: 95.0%)Zeroing memory ar 0x82f611, size 0 0x0
> Starting ELF64 kernel
>
> Exception: <vector=Normal>
> Status register: 0x34010082<CU1,CU0,FR,DE,IPL=8,KX,MODE=KERNEL>
> Cause register: 0x8014<CE=0,IP8,EXC=WADE>
> Exception PC: 0x802204fc, Exception RA: 0x804da7ac
> Write address error exception, bad address: 0xfffff000
> Saved user regs in hex (&gpda 0x81060e08, &_regs 0x81061008):
> arg: 81070000 0 804ff518 1
> tmp: 81070000 1000 80516868 fff8054b ffffffff 81412ef4 a13fb0d0 8
> sve: 81070000 4083ae51 0 4608a976 0 0 0 80ee80d5
> t8 81070000 t9 0 at 0 v0 0 v1 0 k1 fffff000
> gp 81070000 fp 0 sp 0 ra 0
>
> PANIC: Unexpected exception
>
> [Press reset or ENTER to restart.]
> ---------------------------------------------------------------------------
>
> If I understand correctly the problem happened at address 0x802204fc, so
> I checked the system.map file and found
> ffffffff802204c4 T __bzero
> ffffffff80220524 t memset_partial
>
> If I understand correctly, the kernel was executing the __bzero function
> and tried accessing the invalid address 0xfffff000.
It could be any of:
- broken RAM
- Arcboot messing up the kernel load, so __bzero runs invalid code
- __bzero gets called with wrong parameters
Thiemo
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