Re: do_execve() finding vmspace_destroyed set under load

From: Vladimir Grebenschikov (vova_at_fbsd.ru)
Date: 01/31/05

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    To: Kris Kennaway <kris@obsecurity.org>
Date: Mon, 31 Jan 2005 13:12:12 +0300

    ÷ ÓÂ, 29/01/2005 × 18:52 -0800, Kris Kennaway ÐÉÛÅÔ:
    > I'm seeing the following code in do_execve() frequently being
    > triggered when scripts are executed on my SMP machine under load:

    Probably related, I have 100% panic on exec of single linux static
    binary, it happens in do_execve

    sorry, no console here, just retype:

    Fatal trap 12: page fault in kernel mode
    current process = 1638 (tcsh)

    db> trace
    exec_map_first_page(...) at exec_map_first_page+0x32
    do_execve(...) at do_execve+0x2df
    kern_execve(...) at kern_execve+0x124
    execve(...)
    ...

    (tcsh is parent process)
    No problems with other linux or native binaries.

    > if (imgp->vmspace_destroyed) {
    > /* sorry, no more process anymore. exit gracefully */
    > #ifdef MAC
    > mac_execve_exit(imgp);
    > if (interplabel != NULL)
    > mac_vnode_label_free(interplabel);
    > #endif
    > exit1(td, W_EXITCODE(0, SIGABRT));
    > /* NOT REACHED */
    > error = 0;
    > }
    >
    > Needless to say, the scripts get pretty unhappy when they're summarily
    > aborted. What is the cause of this?
    >
    > Kris 

    -- 
Vladimir B. Grebenchikov
vova@fbsd.ru
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