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.dtors looks writable, but attempts to write segfault

This is Ubuntu 9.04, 2.6.28-11-server, 32bit x86 $ cat test.c main() { int *dt = (int *)0x08049f18; *dt = 1; } $ readelf -S ./test ... [18] .dtors PROGBITS 08049f14 000f14 000008 ...