Re: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U8

[Daniel Walker]

On Wed, 2004-10-20 at 10:49, Alexander Batyrshin wrote:
> Ingo Molnar wrote:
> > i have released the -U8 Real-Time Preemption patch:
> > 
> >   http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.9-rc4-mm1-U8
> > 
> 
> used i386/defconfig
> 
> 1. at boot
> [...skip...]
> hda: 78242976 sectors (40060 MB) w/2048KiB Cache, CHS=16383/255/63, 
> UDMA(100)
>   hda: hda1 hda2 hda3 hda4 < hda5 >
> BUG: semaphore recursion deadlock detected!
> .. current task khpsbpkt/723 is already holding c04610c0.
> 00001f23 00001f2f c04e8de9 00000086 00000009 00000000 c011b552 00000020
>         00000400 c03b3efa dfdc9f70 dfdc9f50 0000000c dfdc78f0 c011b430 
> c03b3efa
>         dfdc9f70 c01052a5 c03b3efa c03b3efa 00000000 dfdc78f0 dfdc78f0 
> c01fd364
> Call Trace:
>   [<c012caa4>] __kernel_text_address+0x2e/0x37 (24)
>   [<c01051c9>] show_trace+0x4e/0xcc (12)
>   [<c01052c9>] show_stack+0x82/0x97 (36)
>   [<c01fd364>] __rwsem_deadlock+0xd9/0x135 (24)
>   [<c039e2a0>] down_write_interruptible+0xe6/0x202 (48)
>   [<c029dd80>] hpsbpkt_thread+0x2b/0x86 (48)
>   [<c029dd55>] hpsbpkt_thread+0x0/0x86 (12)
>   [<c01024d1>] kernel_thread_helper+0x5/0xb (4)
> preempt count: 00000003
> . 3-level deep critical section nesting:
> .. entry 1: _spin_lock_irqsave+0x19/0x74 / (0x0)
> .. entry 2: _spin_lock+0x19/0x6d / (0x0)
> .. entry 3: print_traces+0x17/0x50 / (0x0)
> [...skip...]


This looks related to IEEE1394 . It has a deadlock in it. Try turning it
off..



Daniel

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