[Qemu-devel] [Bug 1065325] Re: qemu-system-arm hangs on SIGUSR1 on OS X 10.8.2

[Paolo Bonzini]

This seems like an OS bug (kernel or Cocoa). The usage of the signal is
common to all QEMU system emulation targets, so it's not dependent on
Stellaris.

Try an older version of OS X, or try a different video backend (e.g.
VNC). That may help isolating the problem.

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Title:
  qemu-system-arm hangs on SIGUSR1 on OS X 10.8.2

Status in QEMU:
  New

Bug description:
  I built the latest version of QEMU

  commit b4ae3cfa57b8c1bdbbd7b7d420971e9171203ade
  Date:   Mon Oct 1 12:34:37 2012 +1000

  My system is:
  Darwin localhost 12.2.0 Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 
2012; root:xnu-2050.18.24~1/RELEASE_X86_64 x86_64

  localhost:qemu oliverks$ gcc -v
  Using built-in specs.
  Target: i686-apple-darwin11
  Configured with: 
/private/var/tmp/llvmgcc42/llvmgcc42-2336.11~28/src/configure 
--disable-checking --enable-werror 
--prefix=/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2 
--mandir=/share/man --enable-languages=c,objc,c++,obj-c++ 
--program-prefix=llvm- --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ 
--with-slibdir=/usr/lib --build=i686-apple-darwin11 
--enable-llvm=/private/var/tmp/llvmgcc42/llvmgcc42-2336.11~28/dst-llvmCore/Developer/usr/local
 --program-prefix=i686-apple-darwin11- --host=x86_64-apple-darwin11 
--target=i686-apple-darwin11 --with-gxx-include-dir=/usr/include/c++/4.2.1
  Thread model: posix
  gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)

  Shortly after start up I freeze.  I am running the command line

  ./arm-softmmu/qemu-system-arm -M lm3s811evb -kernel
  ../FreeRTOSV7.2.0/FreeRTOS/Demo/CORTEX_LM3S811_GCC/gcc/RTOSDemo.axf

  The hang appears to occur due to this signal being sent

  static void qemu_tcg_init_cpu_signals(void)
  {
      sigset_t set;
      struct sigaction sigact;

      memset(&sigact, 0, sizeof(sigact));
      sigact.sa_handler = cpu_signal;
      sigaction(SIG_IPI, &sigact, NULL); // <-- Signal that hangs system

      sigemptyset(&set);
      sigaddset(&set, SIG_IPI);
      pthread_sigmask(SIG_UNBLOCK, &set, NULL);
  }

  Oliver

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