Re: panic: bremfree: buffer 0xdc6ff768 not on a queue.

From: Peter Holm (peter_at_holm.cc)
Date: 02/27/05

  • Next message: Peter Holm: "Re: Deadlock with option FULL_PREEMPTION" 
    Date: Sun, 27 Feb 2005 10:00:09 +0100
To: Kris Kennaway <kris@obsecurity.org>

    On Sat, Feb 26, 2005 at 05:35:55PM -0800, Kris Kennaway wrote:
    > A dual CPU machine running 6.0 from a couple of weeks ago panicked
    > overnight with:
    >
    > panic: bremfree: buffer 0xdc6ff768 not on a queue.
    > cpuid = 1
    > KDB: enter: panic
    > [thread pid 26507 tid 100945 ]
    > Stopped at kdb_enter+0x30: leave
    > db> wh
    > Tracing pid 26507 tid 100945 td 0xc6eda730
    > kdb_enter(c06f5a0f,1,c06fce5f,ef4a5a68,c6eda730) at kdb_enter+0x30
    > panic(c06fce5f,dc6ff768,2090022,ef4a5aa8,c0569188) at panic+0x14e
    > bremfree(dc6ff768,2090022,c4544450,c6eda730,0) at bremfree+0x5d
    > getblk(c4544450,b,0,4000,0) at getblk+0x1a8
    > cluster_read(c4544450,32ea8,0,b,0) at cluster_read+0x108
    > ffs_read(ef4a5c0c,c0730880,c4544450,c663d048,ef4a5c58) at ffs_read+0x2e0
    > VOP_READ_APV(c07391e0,ef4a5c0c,c6eda730,36f,0) at VOP_READ_APV+0xbc
    > vn_read(c663d048,ef4a5c80,c9e26d00,0,c6eda730) at vn_read+0x1e7
    > dofileread(c6eda730,c663d048,3,8064000,8000) at dofileread+0xcc
    > read(c6eda730,ef4a5d14,c,16,3) at read+0x6b
    > syscall(805002f,2f,bfbf002f,8000,1000) at syscall+0x2a0
    > Xint0x80_syscall() at Xint0x80_syscall+0x1f
    > --- syscall (3, FreeBSD ELF32, read), eip = 0x280f8b3f, esp = 0xbfbfb7cc, ebp = 0xbfbfb858 ---
    > db>
    >
    > Is this problem already fixed?
    >

    It is my experience that this panic is often a secondary panic,
    like for example this one: http://www.holm.cc/stress/log/jeff48.html

    - Peter

    > Kris
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    > =u2W+
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