Re: NetBSD-6-0 i386 PAE of Nov 18th hangs

["Cherry G. Mathew" <cherry.g.mathew%gmail.com@localhost>]

On 25 November 2012 09:01, S.P.Zeidler <spz%serpens.de@localhost> wrote:
> Hi,
>
> there's a NetBSD-6-0 i386 PAE build of Nov 18th source that should
> do pbulk pkgsrc builds, but has a tendency to hang after a while.
>
> Doing the 'many +' from Xen console during a stuck state gives:
>
>  fatal breakpoint trap in supervisor mode
>  trap type 1 code 0 eip c011c4d4 cs 9 eflags 282 cr2 bb78727c ilevel 6
>  Stopped in pid 0.7 (system) at  netbsd:breakpoint+0x4:  popl    %ebp
>  breakpoint(0,c2c35cc0,da384f7c,c01cbb5b,0,0,da384f9c,2a,1,2b) at 
> netbsd:breakpoint+0x4
>  
> xencons_tty_input(c2b993c0,c074902a,1,c2c3a000,1,0,da384fcc,6,c046ee00,da384fe8)
>  at netbsd:xencons_tty_input+0xb8
>  
> xencons_handler(c2b993c0,0,0,0,da527bb0,c2b9e0c0,c3467000,c0101230,c2b9e0c0,da527bcc)
>  at netbsd:xencons_handler+0x78
>  
> intr_biglock_wrapper(c2b9e0c0,da527bcc,c2c2c2c2,c2c2c2c2,c2c2c2c2,c2c2c2c2,c2c2c2c2,c2c2c2c2,c2c2c2c2,c2c2c2c2)
>  at netbsd:intr_biglock_wrapper+0x1f
>  --- switch to interrupt stack ---
>  Xresume_xenev6() at netbsd:Xresume_xenev6+0x40
>  --- interrupt ---
>  Xspllower(0,c2c48000,0,c2b80011,c0758880,c2c48000,da527c9c,0,5c10,0) at 
> netbsd:Xspllower+0xe
>  
> mi_switch(c2c3a000,3,1,c2c3a000,c2c3a070,c03440f0,da527cac,0,c03440f0,c2c3a000)
>  at netbsd:mi_switch+0x1eb
>  sleepq_block(0,0,c0338ca0,c034d770,0,c2c48000,c2c37d40,c2c36d80,c011c356,9) 
> at netbsd:sleepq_block+0xad
>  
> cv_wait(c03440f0,c0354180,c2c3a000,c046f9e0,c2c3a000,da527d28,0,c03440f0,c2c2c2c2,da527da0)
>  at netbsd:cv_wait+0xb1
>  xc_thread(c2c3a000,757000,c0498200,0,c010006d,0,0,0,0,0) at 
> netbsd:xc_thread+0xb9

....

I have a suspicion this may be priority inversion via running
spllower() at IPL_HIGH *always* in the event path. I'd fixed it in
-current, are you able to test -current under similar circumstances ?

Cheers,

Cherry