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#52 run cat /dev/urandom

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nobody
5
2003-05-29
2003-05-29
No

Hi!

If I run "cat /dev/urandom" inside a user-mode host, the kernel
crash after 1 sec of output.

I'm using Debian testing and gentoo, both with newest packages,
and both kernels crash in this situation

Bye,
Martin

Discussion

  • Nobody/Anonymous

    Logged In: NO

    hi!
    i did some heavy stresstesting on /dev/random
    and /dev/urandom, also while the system was under VERY
    high load (loadavg >60). no crashes. since the bug-reporter
    doesn`t tell, which uml-kernel
    you are using,and nobody also seems to have reported this
    bug - should this bug better be set to
    "closed"? i`m using linux-2.6.0-test11-um on 2.6.0-test9-
    skas-host. system is suse9.
    i really wonder about this "bug" - what sense would it make to
    make uml a honeypot-uml or for jailing
    services, if it could be crashed so easily?

    regards
    roland

     
  • Struan Bartlett

    Struan Bartlett - 2004-11-07

    Logged In: YES
    user_id=750408

    For the record, this is not fixed. I'm running a Debian host
    with 2.4.25 kernel and host-skas3-2.4.25.patch, and a Debian
    guest with 2.4.27 kernel.

    In one xterm I ran "while true; do ls -la /dev/*; done" (see
    also bug report 617709). In the other, "cat /dev/urandom".
    After 5-10 seconds, the 'linux' host process crashes
    completely with:

    Scheduling in interrupt
    Kernel panic: kernel BUG at sched.c:564!

    In interrupt handler - not syncing
    <6>SysRq : Show Regs

    EIP: 0023:[<400e4b38>] CPU: 0 Not tainted ESP: 002b:bffffc68
    EFLAGS: 00000246
    Not tainted
    EAX: ffffffda EBX: 00000001 ECX: 0804cdf0 EDX: 00001000
    ESI: 00001000 EDI: 0804cdf0 EBP: bffffc88 DS: 002b ES: 002b
    Call Trace: [<a0010e5f>] [<a00cae60>] [<a018db51>]
    [<a018dade>] [<a000dc93>]
    [<a00cade9>] [<a00b526f>] [<a0010e5f>] [<a001d2ec>]
    [<a012d637>] [<a017561e>]
    [<a0010e5f>] [<a017561e>] [<a0010405>] [<a00103f1>]
    [<a0010e5f>] [<a000d965>]
    [<a017561e>] [<a0175616>] [<a00b26ec>] [<a00bd0d1>]
    [<a0015e2f>] [<a00bd268>]
    [<a00e1fc4>] [<a00b4caf>] [<a00e0057>] [<a00c32d5>]
    [<a00b4caf>] [<a00c3a6a>]
    [<a012f024>] [<a00c42e2>] [<a00b2816>] [<a00b2855>]
    [<a00b277e>] [<a00c3035>]
    [<a00c8bc0>] [<a001622f>] [<a001a8e3>] [<a0016153>]
    [<a001607b>] [<a0016037>]
    [<a00b26ec>] [<a0015de1>] [<a0015dcf>] [<a00ada41>]
    [<a00ada52>] [<a00b3dfe>]
    [<a00b4108>] [<a00bb278>] [<a00bb211>] [<a00bb211>]
    [<a00bb278>] [<a00b4bed>]
    [<a00b4ba8>] [<a012ef38>] [<a014639d>] [<a014639d>]
    [<a012ef38>] [<a00c8db0>]
    [<a00bb56e>] [<a00bb3e0>] [<a00bb7f0>] [<a00b0404>]
    [<a00bb7f0>] [<a00bb304>]
    [<a0053f2f>] [<a00bb64c>] [<a00ab920>] [<a00b0404>]
    [<a00bb3d4>] [<a00c8c7b>]
    [<a00bb304>] [<a00bb458>] [<a00bb59c>] [<a00bb64c>]
    [<a012f024>] [<a00bb59c>]
    [<a00bb3d4>] [<a00b0404>] [<a00bb64c>] [<a00bb458>]
    [<a00bb59c>] [<a00bb59c>]
    [<a00b597f>] [<a00b2855>] [<a00bb458>] [<a00be776>]
    [<a00be776>] [<a00be81d>]
    [<a0146380>] [<a00b0658>] [<a00be81d>] [<a00e031b>]
    [<a00e05d6>] [<a00bb59c>]
    [<a00e1458>] [<a00bb637>] [<a00e0057>] [<a00e0057>]
    [<a00c3a29>] [<a00c32d5>]
    [<a00c5f3d>] [<a00c5e11>] [<a00c0e91>] [<a00c5d50>]
    [<a0033e1a>] [<a00bad8e>]
    [<a00b35bb>] [<a00b36e3>] [<a00baddc>] [<a00badd3>]
    [<a00b9fb5>] [<a00ba0bd>]
    [<a00b01ba>] [<a00ba31a>] [<a00b26ec>] [<a00baa87>]
    [<a00baa71>] [<a012ef38>]
    [<a012efd1>]

     

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