Re: PROBLEM [ATI fglrx 2.6.15 put_page BUG]

[Hugh Dickins <hugh@veritas.com>]

On Fri, 3 Feb 2006, Badri Pillai wrote:
> 
> Problem summary: after upgrading to from 2.6.15.1 -> 2.6.15.2
> the system dumps following trace, when trying to reboot through KDE 3.5:

I doubt it's anything new in 2.6.15.2.

> - ------------[ cut here ]------------
> kernel BUG at mm/swap.c:49!
> invalid operand: 0000 [#2]

That's #2 so there should have been an earlier one, but never mind...

> SMP
> Modules linked in: nls_utf8 ntfs snd_rtctimer ipv6 fglrx ....

ATI's fglrx is Tainting your kernel.

> EIP:    0060:[<c013fbce>]    Tainted: P    B VLI
> EFLAGS: 00013256   (2.6.15.2_DL6)

I don't know 2.6.15.2_DL6, but never mind...

> EIP is at put_page+0x4a/0x66
> Process X (pid: 1682, threadinfo=db55e000 task=c17fe570)

And further down...

>  [<c013fbce>] put_page+0x4a/0x66
>  [<c01ba078>] avc_has_perm_noaudit+0x37/0xe3
>  [<e1c93717>] drm_free+0xb7/0x150 [fglrx]
>  [<e1c93717>] drm_free+0xb7/0x150 [fglrx]
>  [<c0103273>] error_code+0x4f/0x54
>  [<e1c9007b>] FGLDRM__vm_info+0xa0/0x16b [fglrx]
>  [<e1c9007b>] FGLDRM__vm_info+0xa0/0x16b [fglrx]
>  [<c013fbce>] put_page+0x4a/0x66
>  [<c0143a8b>] zap_pte_range+0x172/0x236
>  [<c0143bf8>] unmap_page_range+0xa9/0xf8
>  [<c0143d48>] unmap_vmas+0x101/0x1e2
>  [<c0147606>] unmap_region+0x92/0xf8
>  [<c0147877>] do_munmap+0xd9/0xef
>  [<c01478dd>] sys_munmap+0x50/0x68
>  [<c0102717>] sysenter_past_esp+0x54/0x75

Yes, fglrx definitely looks implicated.  ATI were carefully coding
around an anomaly in our page count handling, then 2.6.15 removed
that anomaly, so their wrapper code needs an additional #ifdef on
Linux kernel version.  I'll forward you offline what Martin Drab
posted a few weeks back.

Hugh
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