[Qemu-devel] [Bug 1318281] [NEW] linux-user: x86_64 target fails to call sys_futex()

[Jiajie Hu]

Public bug reported:

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.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1318281

Title:
  linux-user: x86_64 target fails to call sys_futex()

Status in QEMU:
  New

Bug description:
  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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