Re: occational system lock up in 6.0_BETA and 6.99.5

More about system lockup under heavy load.

> ~# ... DDB break in works ...
> 
> db> bt
> 0x0060bd90: at comintr+0x590
> 0x0060bde0: at pic_handle_intr+0x198
> 0x0060be20: at trapstart+0x684
> 0x0060bef0: at sched_curcpu_runnable_p+0x2c <<< THIS <<<
> 0x0060bf00: at idle_loop+0xe8
> 0x0060bf20: at setfunc_trampoline+0x8
> saved LR(0x7ffffd) is invalid.
> ...
>
> The last operation
> I did is invoking "ps xa" and DDB shows no ps process.

It's now quite obvious it's the "schedular stuck"  The DDB traceback
is the same as GCC4.5 genautomata lockup case.

db> bt
0x0060bd90: at comintr+0x590
0x0060bde0: at pic_handle_intr+0x198
0x0060be20: at trapstart+0x684
0x0060bef0: at sched_curcpu_runnable_p+0x2c <<< HERE <<<
0x0060bf00: at idle_loop+0xe8
0x0060bf20: at cpu_lwp_bootstrap+0xc
saved LR(0x7ffffd) is invalid.

Toru Nishimura / ALKYL Technology