These are some samples of the output, showing the valgrind output. They've all
been recorded on my machine, except for the last one which was on my friend's
(and has more debugging information that you might find more useful). The
lines before and after are the testcase's output showing some progress.

------

poster  56500000
waiter  56500000
==2005-04-30 14:38:21.836 464== Thread 3:
==2005-04-30 14:38:21.836 464== Syscall param futex(futex) points to unaddressable byte(s)
==2005-04-30 14:38:21.836 464==    at 0x1B9244A2: sem_post@@GLIBC_2.1 (in /lib/libpthread-2.3.4.so)
==2005-04-30 14:38:21.836 464==    by 0x1B9209A0: start_thread (in /lib/libpthread-2.3.4.so)
==2005-04-30 14:38:21.836 464==    by 0x1B9DD9E9: clone (in /lib/libc-2.3.4.so)
==2005-04-30 14:38:21.836 464==  Address 0x1C2EB818 is 0 bytes inside a block of size 16 free'd
==2005-04-30 14:38:21.836 464==    at 0x1B902B5C: free (vg_replace_malloc.c:152)
==2005-04-30 14:38:21.836 464==    by 0x80486E5: waiter (semtest.c:38)
==2005-04-30 14:38:21.836 464==    by 0x1B9209A0: start_thread (in /lib/libpthread-2.3.4.so)
==2005-04-30 14:38:21.836 464==    by 0x1B9DD9E9: clone (in /lib/libc-2.3.4.so)
poster  57000000
waiter  57000000

------

poster  128500000
waiter  128500000
==2005-04-30 16:45:36.865 5908== Thread 3:
==2005-04-30 16:45:36.865 5908== Syscall param futex(futex) points to unaddressable byte(s)
==2005-04-30 16:45:36.866 5908==    at 0x1B9244A2: sem_post@@GLIBC_2.1 (in /lib/libpthread-2.3.4.so)
==2005-04-30 16:45:36.866 5908==    by 0x1B9209A0: start_thread (in /lib/libpthread-2.3.4.so)
==2005-04-30 16:45:36.866 5908==    by 0x1B9DD9E9: clone (in /lib/libc-2.3.4.so)
==2005-04-30 16:45:36.868 5908==  Address 0x1C2F0758 is 0 bytes inside a block of size 16 free'd
==2005-04-30 16:45:36.868 5908==    at 0x1B902B5C: free (vg_replace_malloc.c:152)
==2005-04-30 16:45:36.868 5908==    by 0x80486E5: waiter (semtest.c:38)
==2005-04-30 16:45:36.873 5908==    by 0x1B9209A0: start_thread (in /lib/libpthread-2.3.4.so)
==2005-04-30 16:45:36.873 5908==    by 0x1B9DD9E9: clone (in /lib/libc-2.3.4.so)
poster  129000000
waiter  129000000

------

poster  49000000
waiter  49000000
==2005-04-30 20:39:12.607 16319== Thread 3:
==2005-04-30 20:39:12.608 16319== Syscall param futex(futex) points to unaddressable
byte(s)
==2005-04-30 20:39:12.608 16319==    at 0x1B9244A2: sem_post@@GLIBC_2.1 (in /lib/libpthread-2.3.4.so)
==2005-04-30 20:39:12.608 16319==    by 0x1B9209A0: start_thread (in /lib/libpthread-2.3.4.so)
==2005-04-30 20:39:12.608 16319==    by 0x1B9DD9E9: clone (in /lib/libc-2.3.4.so)
==2005-04-30 20:39:12.608 16319==  Address 0x1C33DB18 is 0 bytes inside a block of size 16 free'd
==2005-04-30 20:39:12.608 16319==    at 0x1B902B5C: free (vg_replace_malloc.c:152)
==2005-04-30 20:39:12.608 16319==    by 0x80486E5: waiter (semtest.c:38)
==2005-04-30 20:39:12.608 16319==    by 0x1B9209A0: start_thread (in /lib/libpthread-2.3.4.so)
==2005-04-30 20:39:12.608 16319==    by 0x1B9DD9E9: clone (in /lib/libc-2.3.4.so)
poster  49500000
waiter  49500000

------

This one is my friend's.


poster  82000000
waiter  82000000
==30665== Thread 3:
==30665== Syscall param futex(futex) points to unaddressable byte(s)
==30665==    at 0x1B921812: sem_post@@GLIBC_2.1 (sem_post.S:52)
==30665==    by 0x1B91DA40: start_thread (pthread_create.c:269)
==30665==    by 0x1B9DD739: clone (clone.S:102)
==30665==  Address 0x1CD05628 is 0 bytes inside a block of size 16 free'd
==30665==    at 0x1B9048AC: free (vg_replace_malloc.c:152)
==30665==    by 0x8048705: waiter (semtest.c:41)
==30665==    by 0x1B91DA40: start_thread (pthread_create.c:269)
==30665==    by 0x1B9DD739: clone (clone.S:102)
poster  82500000
waiter  82500000