Date: Tue, 27 Jan 2004 13:34:07 -0500 From: John Baldwin <jhb@FreeBSD.org> To: Peter Losher <Peter_Losher@isc.org>, current@freebsd.org Subject: Re: spin lock panic in 5.2-REL Message-ID: <200401271334.07761.jhb@FreeBSD.org> In-Reply-To: <20040127082106.L14045@farside.isc.org> References: <20040127082106.L14045@farside.isc.org>
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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@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
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