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    SubjectUnkillable gdb process gets system unusably slow
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    Date
    Fully reproducible with me. v2.6.23.1 x86-64 SMP kernel, Core 2 CPU, gdb
    v6.6.90.20070912-debian.

    gdb ./hang
    run
    fr 1
    p (char*)base

    p command hangs and the entire system becomes unusably slow. kill -9
    doesn't kill gdb.

    /* gcc hang.c -o hang -g -Wall */
    #include <stdio.h>
    #include <string.h>
    #include <fcntl.h>
    #include <unistd.h>
    #include <sys/mman.h>

    int main(void)
    {
    int fd;
    char buf[100];
    void *base;

    fd = open("hang.tmp", O_RDWR | O_CREAT, 0600);
    if (fd == -1) perror("open");

    base = mmap(NULL, 100, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
    if (base == MAP_FAILED)
    perror("mmap");
    memcpy(buf, base, sizeof(buf));
    return 0;
    }

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