panic in 4.9-stable

From: Mikhail Teterin (mi+mx_at_aldan.algebra.com)
Date: 04/20/04

  • Next message: Mike Lambert: "a tale of bad hardware" 
    Date: Tue, 20 Apr 2004 14:54:22 -0400
To: stable@FreeBSD.org

    The following panic hits seemingly at random, but persistent (once a
    week on average):

            Fatal trap 12: page fault while in vm86 mode
            fault virtual address = 0x6400
            fault code = user read, page not present
            instruction pointer = 0x200:0x4400
            stack pointer = 0x0:0xddb50ff8
            frame pointer = 0x0:0x57
            code segment = base 0xc01cc039, limit 0x99830, type 0x18
                                  = DPL 0, pres 1, def32 0, gran 0
            processor eflags = interrupt enabled, resume, vm86, IOPL = 0
            current process = 3824 (XFree86)
            interrupt mask = none
            trap number = 12
            panic: page fault

            syncing disks... 36 9 5 3
            done
            Uptime: 23m28s
            Terminate ACPI

    The machine runs 4.9-stable from March 4th. It has a dual NVidia card
    with two monitors at 1024x768 resolutions -- perhaps, some resource
    shortage in NVidia's driver? The code segment seems to point to shmat(),
    according to the sorted nm output fragment below (crash address inserted):

            [...]
            c01bfd08 t shm_delete_mapping
            c01bfd8c T shmdt
            c01bfe00 T shmat
    --> c01cc039 -- the code segment base from the panic above
            c01cc0e4 T sokqfilter
            c01cc15c t filt_sordetach
            c01cc1b4 t filt_soread
            c01cc214 t filt_sowdetach
            [...]

    Any comments? Thanks!

            -mi

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