Fatal trap 12: page fault while in kernel mode

From: Christian Brueffer (chris_at_unixpages.org)
Date: 12/30/04

  • Next message: Sam Leffler: "Re: 802.11 WPA and wpa_supplicant" 
    Date: Thu, 30 Dec 2004 03:29:01 +0100
To: current@freebsd.org

    Hi,

    with a kernel build from sources from Dec 30, approximately 00:30:00
    UTC, I'm getting the following reproducible trap during startup:

    Memory modified after free 0xc1c06600(508) val=1ff01ff @ 0xc1c06600

    Fatal trap 12: page fault while in kernel mode
    fault virtual address = 0x1ff021f
    fault code = supervisor read, page not present
    instruction pointer = 0x8:0xc0706823
    stack pointer = 0x10:0xe53cf730
    frame pointer = 0x10:0xe53cf750
    code segment = base 0x0, limit 0xfffff, type 0x1b
                            = DPL 0, pres 1, def32 1, gran 1
    processor eflags = interrupts enabled, resume, IOPL = 0
    current process = 61 (rcorder)
    [thread pid 61 tid 100051 ]
    Stopped at mtrash_ctor+0x63: movl 0x20(%eax),%edx
    db> tr
    Tracing pid 61 tid 100051 td 0xc1ab4170
    mtrash_ctor(c1c06600,200,0,101,c07dbf04) at mtrash_ctor+0x63
    uma_zalloc_arg(c10456c0,0,101,c1046be0,c07b77c6) at uma_zalloc_arg+0x484
    malloc(168,c07ee200,101,b2,0) at malloc+0x84
    ufsdirhash_build(c1c4b7a8,c0818348,c08386e0,0,0) at ufsdirhash_build+0x376
    ufs_lookup(e53cf944,e53cfbec,e53cfc00,c057aa65,c1ab4170) at ufs_lookup+0x129
    vfs_cache_lookup(e53cf9c0,20002,c1ab4170,c07aaca7,e53cfbec) at vfs_cache_lookup+0x278
    lookup(e53cfbd8,0,c07aa52c,a7,c0838700) at lookup+0x274
    namei(a53cfbd8,1,c07ab4bd,78,c079f15a) at namei+0x27d
    vn_open_cred(e53cfbd8,e53cfcd8,1a4,c1978d80,3) at vn_open_cred+0x192
    vn_open(e53cfbd8,e53cfcd8,1a4,3,0) at vn_open+0x33
    kern_open(c1ab4170,bfbfe6d3,0,1,1b6) at kern_open+0xf9
    open(c1ab4170,e53cfd14,c,c1ab4170,3) at open+0x2e
    syscall(2f,2f,2f,bfbfe63c,4) at syscall+0x137
    Xint0x80_syscall() at Xint0x80_syscall+0x1f
    --- syscall (5, FreeBSD ELF32, open), eip = 0x80573a7, esp = 0xbfbfe2ccm, ebp = 0xbfbfe2f8 ---
    db>

    This doesn't happen with a kernel from Dec 23.

    - Christian 

    -- 
Christian Brueffer	chris@unixpages.org	brueffer@FreeBSD.org
GPG Key:	 http://people.freebsd.org/~brueffer/brueffer.key.asc
GPG Fingerprint: A5C8 2099 19FF AACA F41B  B29B 6C76 178C A0ED 982D

  • Next message: Sam Leffler: "Re: 802.11 WPA and wpa_supplicant"

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