Re: spin lock panic in 5.2-REL

From: John Baldwin <jhb_at_FreeBSD.org>
Date: Tue, 27 Jan 2004 13:34:07 -0500
On Tuesday 27 January 2004 03:47 am, Peter Losher wrote:
> So, the quad-Xeon box serving half of ftp.freebsd.org was upgraded to
> 5.2-RELEASE Sunday night, and a couple of hours ago it broke to gdb w/ a
> spin lock panic.
>
> -=-
> spin lock sched lock held by 0x8d2f7a00 for > 5 seconds
>    panic: spin lock held too long
>    cpuid = 4;
>    Debugger("panic")
>    Stopped at      Debugger+0x55:  xchgl   %ebx,in_Debugger.0
>    db>
>    db>
>    db>
>    db> [tail-]
> -=-
>
> We had this issue after updating to 5.1-REL, one of our techs caught this
> and reset the box to bring it back online, so I don't have any additional
> info.  I am not sure if this is a revisit of those same problems, or if
> it's something new.

This is a very hard to debug problem.  If WITNESS is on it provides more 
useful information that can help track that down, but I wouldn't expect a 
production machine to be using WITNESS.

-- 
John Baldwin <jhb_at_FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
Received on Tue Jan 27 2004 - 11:16:32 UTC

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