Re: MAKEDEV oopses
On Sunday, 23 Nov, Roberto A. Lumbreras Pastor wrote:
> Hi all.
>
> /dev/MAKEDEV (makedev-1.5-4) segfaults and oopses for me...
>
> MAKEDEV(15040): unaligned trap at 0000000000000029: 00000001209235e4 2d 0
> MAKEDEV(15040): unaligned trap at 000000000000001f: 00000001209235e4 23 1
> MAKEDEV(15040): unaligned trap at 0000000000000023: 00000001209235e4 27 1
> MAKEDEV(15040): unaligned trap at 000000000000001f: 00000001209235e4 23 1
> Unable to handle kernel paging request at virtual address 7570696e616d2070
[...]
>
> The box is an AlphaServer 1000A (noritake-primo, EV56 cpu), and
> kernel 2.0.30 + alpha-patches-2.0.30-0.3 from gatekeeper.dec.com.
>
Unaligned trap handling is broken in all alpha-patches from gatekeeper
(in fact it is broken in the em86 patches, which are included in
alpha-patches), although it's been a known problem since
alpha-patches-2.0.30-0.1. See
genie.ucd.ie:/pub/alpha/kernel/my_patches/traps.diff.
These unaligned accesses from MAKEDEV are certainly bad (though of
course they shouldn't be dangerous to the kernel health), but there is
no easy way to get rid of them except to resort to the old MAKEDEV
script. I haven't checked the newest version, though.
Nikita
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