The Linux kernel bug allows a simple C program to crash the kernel, effectively locking the whole system. The security hole affects both 2.4.2x and 2.6.x kernels on the x86 and x86_64 architectures.
The flaw was by accident discovered by Stian Skjelstad when he was doing some code tests while on vacation. He was quite surprised when he discovered that the code he was trying froze his machine. He reported it to the Linux-kernel mailing list and the gcc bugzilla 2004-06-09.
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