Date: Wed, 29 Mar 2006 13:00:01 -0800 From: Cy Schubert <Cy.Schubert@komquats.com> To: freebsd-stable@freebsd.org Subject: Strange Panic During Reboot Message-ID: <200603292100.k2TL01rA086571@cwsys.cwsent.com>
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I'm getting the following panic during shutdown of a 6.1-PRERELEASE system cvsupped yesterday. Strangely enabling DDB in the kernel "fixes" the problem. The computer is an old P120 (which I should probably replace). It occurs every time when DDB is disabled but when DDB is enabled, it does not panic. All buffers synced. Uptime: 19m16s (da0:ahc0:0:0:0): SYNCHRONIZE CACHE. CDB: 35 0 0 0 0 0 0 0 0 0 (da0:ahc0:0:0:0): Sense Error Code 0xe0 at block no. -1073741792 (decimal) kernel trap 12 with interrupts disabled Fatal trap 12: page fault while in kernel mode fault virtual address = 0x1c fault code = supervisor write, page not present instruction pointer = 0x20:0xc0539553 stack pointer = 0x28:0xc6da2a68 frame pointer = 0x28:0xc6da2ab4 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = resume, IOPL = 0 current process = 1728 (reboot) trap number = 12 panic: page fault Uptime: 19m16s I suspect that memory is mapped a tiny bit differently with DDB enabled and thus we don't tickle a bug somewhere. Thoughts? -- Regards, Phone: (250)387-8437 Cy Schubert Fax: (250)387-5231 Team Leader, Solaris Team Email: Cy.Schubert@osg.gov.bc.ca Open Systems Group, CITS Ministry of Labour and Citizens' Services Province of BC FreeBSD UNIX: cy@FreeBSD.org
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