Re: 2.6.9-rc2-mm4 ps hang ?

[Badari Pulavarty]

On Fri, 2004-10-01 at 16:49, Andrew Morton wrote:
> Badari Pulavarty <pbadari@xxxxxxxxxx> wrote:
> >
> > Here is the full sysrq-t output.
> 
> What's this guy up to?
> 
> db2fmcd       D 0000000000000000     0 11032      1          1373 11031 (NOTLB)
> 00000101b9b9bef8 0000000000000002 0000003700000037 00000101c13608a0 
>        000000010000009f 0000010199649250 0000010199649588 0000000000000000 
>        0000000000000206 ffffffff801353db 
> Call Trace:<ffffffff801353db>{try_to_wake_up+971} <ffffffff80445570>{__down_write+128} 
>        <ffffffff80125e7f>{sys32_mmap+143} <ffffffff80124b01>{ia32_sysret+0} 
>        
> 
> Something is seriously screwed up if it's stuck in try_to_wake_up().  Tried
> generating a few extra traces?
> 
> Then again, maybe we're missing an up_read() somewhere.  hrm, I'll check.
> 
Doesn't make any sense..

According to my objdump

try_to_wake_up+971 ==> task_rq_unlock()

kernel/sched.c:580
    265f:       48 8b 75 d0             mov   
0xffffffffffffffd0(%rbp),%rsi
    2663:       4c 89 ff                mov    %r15,%rdi
    2666:       e8 00 00 00 00          callq  266b
<try_to_wake_up+0x3cb>   


    578 static inline void task_rq_unlock(spinlock_t *rql, unsigned long
*flags)
    579 {
    580         spin_unlock_irqrestore(rql, *flags);
    581 }

Why would I be stuck in spin_unlock() ?

Thanks,
Badari


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