Re: sk Panic in 8.0-CURRENT

In message <20080212014312.GA6953_at_cdnetworks.co.kr>, Pyun YongHyeon writes:
> On Mon, Feb 11, 2008 at 04:10:40PM -0800, Cy Schubert wrote:
>  > Has anyone seen the following mutex panic in sk_jfree? The last time this 
>  > system booted was Jan 31.
>  > 
> 
> [...]
> 
>  > panic: mtx_lock() of spin mutex (null) _at_ /dsk03/src/cvs-current/src/sys/mo
> du
>  > les/sk/../../dev/sk/if_sk.c:2439
>  > cpuid = 0
>  > KDB: enter: panic
>  > [thread pid 12 tid 100038 ]
>  > Stopped at      kdb_enter+0x34: movl    $0,kdb_why
>  > db> bt
>  > Tracing pid 12 tid 100038 td 0xc3363cc0
>  > kdb_enter(c0a36183,c0a36183) at kdb_enter+0x34
>  > panic(c0a34f9b,0,c0cefb36,987,e2583cc0,...) at panic+0x111
>  > _mtx_lock_flags(e2586bbc,0,c0cefb36,987,c35d1000,...) at 
>  > _mtx_lock_flags+0x70
>  > sk_jfree(c341f000,e2583cc0) at sk_jfree+0x3a
>  > mb_free_ext(c35d1000) at mb_free_ext+0x18f
>  > m_freem(c35d1000) at m_freem+0x1f
>  > arpintr(c35d1000) at arpintr+0xc0b
>  > netisr_dispatch(12,c35d1000) at netisr_dispatch+0x5d
>  > ether_demux(c33d5400,c35d1000) at ether_demux+0x1c9
>  > ether_input(c33d5400,c35d1000,c33f36e0,0,c0cefb36,...) at ether_input+0x2f
> 9
>  > sk_jumbo_rxeof(c33f36e0,c341f000,c33d5400,0,c342d340,...) at 
>  > sk_jumbo_rxeof+0x215
>  > sk_intr(c33f3680) at sk_intr+0xac
>  > ithread_loop(c342ab40,e2589d38) at ithread_loop+0x175
>  > fork_exit(c06eded0,c342ab40,e2589d38) at fork_exit+0xb0
>  > fork_trampoline() at fork_trampoline+0x8
>  > --- trap 0, eip = 0, esp = 0xe2589d70, ebp = 0 ---
>  > db> 
>  > 
> 
> I'm not sure whether this panic is related with recent phk's change
> to MEXTADD(). If this is the case, you may have to use standard MTU
> instead of 9000.
> Since FreeBSD now have physically contiguous jumbos I have plan to
> take advantage of it instead of use of local allocator. That would
> also eliminate a jlist lock required to serialize accessing jumbo
> buffers allocated from driver. Give me a couple of days.

Thanks. Reducing the MTU from 9000 to default (1500) circumvents the panic.


-- 
Cheers,
Cy Schubert <Cy.Schubert_at_komquats.com>
FreeBSD UNIX:  <cy_at_FreeBSD.org>   Web:  http://www.FreeBSD.org

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