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==11133== Invalid write of size 8
==11133==    at 0x4719CA: trampoline (thread-unix.c:185)
==11133==    by 0x3398E0EEAF: ??? (in /lib64/libpthread-2.13.so)
==11133==    by 0x3398233443: sigsuspend (in /lib64/libc-2.13.so)
==11133==    by 0x471983: make_context (thread-unix.c:163)
==11133==    by 0x471B53: setup_thread (thread-unix.c:254)
==11133==    by 0x47298A: switch_thread (thread-unix.c:280)
==11133==    by 0x46E98B: sleep (kernel.c:236)
==11133==    by 0x4071C9: init_tagcache (main.c:323)
==11133==    by 0x40729E: init (main.c:379)
==11133==    by 0x407014: main (main.c:157)
==11133==  Address 0x7cff60 is 40064 bytes inside data symbol "scroll_stack"