Frederick W Reimer wrote:
>
> Hello,
>
> Word of warning - I'm not a kernel hacker, so forgive me if I give
> incomplete information.
>
> Seems that QuakeII bombs on syscall 166 (sys_vm86) on my 2.2.6 based SMP
> system (2 PII-350's).
>
> Here's the last strace line:
> SYS_166(0x402f20f8, 0, 0x402f2288, 0x1150, 0x1000 <unfinished ...>
> +++ killed by SIGSEGV +++
>
> with the kernel output of:
> no vm86_info: BAD
>
> Looking at the definition for this syscall -
> asmlinkage int sys_vm86(unsigned long subfunction, struct
> vm86plus_struct * v86);
>
> it looks like quake2 is passing garbage to the function? Shouldn't it
> have only two arguments (the subfunction and a pointer to a
> vm86plus_struct structure)?
>
> It's actually bombing in save_v86_state, which gets called only from
> return_to_32_bit, which is called from a few places. But, it only
> prints this info if vm86_info is blank. Tracing the sys_vm86 call, it
> looks like vm86_info is set during a VM86_ENTER or VM86_ENTER_NO_BYPASS
> before save_v86_state could possibly get called.
>
> Was sys_vm86old once syscall 166 and sys_vm86 replaced it (Doesn't look
> like it from the numbering of the two syscalls)? Can't think of any
> other possibility other than quake2 is just passing the kernel garbage.
> Is there any way I can trace it to give more info (like checking the
> address that is passed as a pointer or something)? I'll try it on an
> earlier kernel if needed.
>
> BTW, it works under software rendering (+set vid_ref softx). It only
> bombs when I'm trying to use my Voodoo2 board. I have the 2.0 version
> of the 3dfx.o module compiled under 2.2.6 installed.
>
> Also, it doesn't work with the ad1816 sound driver as a module (havn't
> tried compiled in yet). It core dumps during a memset when initializing
> the sound. Don't know if this is ad1816 specific, or just a generic
> problem with quake2...
>
> Sorry for the long fractured post. It's late.
>
> Fred Reimer
>
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