Date: Tue, 12 Jan 2010 22:27:31 -0500 From: Henry Wong <hwong@lumeta.com> To: freebsd-bugs@FreeBSD.org Cc: Henry Wong <hwong@lumeta.com> Subject: Re: kern/142728: Panic: Fatal trap 12 in g_io_request Message-ID: <4B4D3DA3.1010706@lumeta.com> In-Reply-To: <4B4CCBCE.8040004@lumeta.com> References: <201001120250.o0C2o2sI055242@freefall.freebsd.org> <4B4CCBCE.8040004@lumeta.com>
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I'm new at trying to find kernel panics. As I said, I cannot seem to get a dump. From looking at the Instruction pointer, it looks like the g_io_request function is attempting to work with a g_consumer that refers to a g_provider that has been freed. The "pp" points off to a page that is not in its address space (trap 12) or doens't belong to it (trap 9). The instruction pointer refers to the attempt to retrieve pp->name as the parameter for the g_trace(G_T_BIO, ... ). Since the process that is listed as the "current process" varies a lot, I suspect that the trap is being caused by some event such as an interrupt. Could someone please give me some hints on how I might proceed to 1) get more information or 2) get this problem to a point where it can be diagnosed and resolved. Thank you, -- Henry Wong Lead Software Engineer Lumeta - / Securing the Network in the Face of Change / _hwong@lumeta.com_ 732.357.3534 (office) 732.564.0731 (fax) 220 Davidson Avenue Somerset , NJ 08873-4146 www.lumeta.com
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