Re: NVE

From: Kövesdán Gábor (gabor.kovesdan_at_t-hosting.hu)
Date: 07/27/05

  • Next message: Daniel O'Connor: "AltQ + ng_iface" 
    Date: Wed, 27 Jul 2005 20:18:20 +0200
To: Maxime Henrion <mux@FreeBSD.org>

    Maxime Henrion wrote:

    >That's the plan. I'm actually waiting for feedback to know whether this
    >helps make things better or not. I'll ask re@ for permission to MFC it
    >once I know it's good (I have no nve(4) hardware myself).
    >
    >
    >
    Well... I had an another panic but it's a bit different from the
    previous panics I've got
    with nve (http://www.freebsd.org/cgi/query-pr.cgi?pr=83943),but it is
    quite similar to
    an another panic I've recently had on RELENG_6.
    (http://www.freebsd.org/cgi/query-pr.cgi?pr=84133)
    I took a piece of paper again and wrote down the trace output:

    panic: nve_ifstart: attempted use of a free mbuf!
    KDB: enter: panic
    [ thread pid 555 tid 100068 ]
    Stopped at kdb_enter+0x2f:nop
    db> trace
    Tracing pid 555 tid 100068 td 0xffffff001ed2ea00
    kdb_enter() at kdb_enter+0x2f
    panic() at panic+0x1d2
    nve_ifstart() at nve_ifstart+0x3a5
    ether_output_frame() at ether_output_frame+0x249
    ether_output() at ether_output+0x349
    ip_output() at ip_output+0xb17
    tcp_output() at tcp_output+0x9c2
    tcp_usr_rcvd() at tcp_usr_rcvd+0x70
    soreceive() at soreceive+0x1009
    soo_read() at soo_read+0xc0
    dofileread() at dofileread+0x94
    kern_readv() at kern_readv+0x60
    read() at read+0x4a
    syscall() at syscall+0x4b2
    Xfast_syscall() at Xfast_syscall+0xa8
    --- syscall (3, FreeBSD ELF64, read), rip = 0x80095d84c, rsp = 0x6d5530,
    rbp = 0x6d55b8 ---

    Look at the second PR I mentioned. It is a general protection fault, but
    the trace output is quite similar.
    They must be in relation.

    Cheers,

    Gábor Kövesdán
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