add launchpad bug reports without comments

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+linux-user: x86_64 target fails to call sys_futex()
+
+I'm building the latest QEMU (06b4f00d53637f2c16a62c2cbaa30bffb045cf88) on ARM to run some x86_64 executables in user mode. This is my configuration:
+
+./configure \
+  --prefix=/root/qemu-x86_64 \
+  --target-list=x86_64-linux-user \
+  --disable-system \
+  --disable-tools
+
+The following program is used for testing:
+
+https://gist.github.com/hujiajie/e8cff43b574b399c8f59#file-test-c
+
+I compile the test program in Debian-7.5-amd64 like this:
+
+gcc -o test `pkg-config --cflags glib-2.0` test.c `pkg-config --static --libs glib-2.0` -static
+
+and launch the program on ARM with
+
+qemu-x86_64 test
+
+The test crashes with the following message:
+
+qemu: uncaught target signal 11 (Segmentation fault) - core dumped
+Segmentation fault
+
+The output of `strace qemu-x86_64 test` is here:
+
+https://gist.github.com/hujiajie/88d1d5e580d432d11b2d#file-test-strace-log
+
+It seems that the error is caused by the failure of the futex syscall.
+
+qemu-i386 could launch the 32-bit test perfectly, the problem only happens on a x86_64 target.
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