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    Subject2.5.50 hang when copying files, handwritten trace included
    2.5.50 hung when copying 800M.
    mke2fs on a 10G partition, then try to copy
    the entire /home there. Source and destionation
    was on the same disk. After a while, this happened:

    EIP: wake_up_forked_process+0xb8/0x18c
    EAX: 5a5a5a5a (suspicious)

    trace:
    do_fork
    kernel_thread
    pdflush
    kernel_thread_helper
    start_one_pdflush_thread
    pdflush
    __pdflush
    __pdflush
    background_writeout
    kernel_thread_helper


    The machine has 512M ram. It is a pentium IV 2.4GHz.
    The kernel is compiled with smp (hoping for hyperthreading
    but it haven't happened yet), preempt, devfs support (but
    devfs isn't mounted anywhere currently) and IDE driver
    for the SIS 5513.

    Both filesystems are ext2. The machine was in
    single-user mode at the time. I can reliably
    reproduce this if a more detailed oops
    will help in debugging. I have 2G of swap space
    on another IDE drive.

    compiled with gcc 2.95.4 from debian testing

    ide controller:
    00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE]

    I'm using dma, irq unmasking, 32-bit io and multiple
    sector transfers.

    Helge Hafting
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