[Qemu-devel] [Bug 1406016] Re: qemu-system-arm hangs at start on OS X

[Eric Allen]

Ah, good question! I found an image and instructions at
http://fedoraproject.org/wiki/Architectures/ARM/HowToQemu#Using_QEMU_without_libvirt
that was a bit easier to work through, and sure enough, it works on
Linux but not on OS X.

Linux precise64 3.2.0-37-generic:

address@hidden:/opt/qemu-images/arm/fedora$ 
/home/vagrant/qemu-2.2.0/arm-softmmu/qemu-system-arm -M versatilepb -kernel 
zImage-qemu-versatile-3.0.8-4.fc17.armv5tel -hdc rootfs-f12 -append "root=0800 
console=ttyAMA0" -nographic
audio: Could not init `oss' audio driver
Uncompressing Linux... done, booting the kernel.
Linux version 3.0.8 (address@hidden) (gcc version 4.1.2 20070925 (Red Hat 
4.1.2-33.fa1)) #16 Wed Mar 28 15:07:56 CEST 2012
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00093177
CPU: VIVT data cache, VIVT instruction cache
Machine: ARM-Versatile PB
Memory policy: ECC disabled, Data cache writeback
sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms
...

-------------------------


OS X (just built QEMU 2.2.0 from source):

$ /Users/epall/bigcode/qemu/arm-softmmu/qemu-system-arm -M versatilepb -kernel 
zImage-qemu-versatile-3.0.8-4.fc17.armv5tel -hdc rootfs-f12 -append "root=0800 
console=ttyAMA0" -nographic
Uncompressing Linux... done, booting the kernel.

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https://bugs.launchpad.net/bugs/1406016

Title:
  qemu-system-arm hangs at start on OS X

Status in QEMU:
  New

Bug description:
  Both from release 2.1.2 and built from a recent source, qemu-system-
  arm seems to hang immediately after starting up, never getting to the
  point of actually booting.

  I've tried qemu-system-mipsel with another image and it worked fine,
  so this seems to be specific to the ARM runtime. I've tried two
  different ARM kernels, and I also ran into this with QEMU 2.1.2
  release, installed from a bottle using homebrew.

  Host: Mac OS X 10.9.5 (Darwin Kernel Version 13.4.0)
  QEMU version: built from address@hidden
  Build command: ./configure --enable-cocoa 
--target-list=arm-softmmu,mipsel-softmmu && make
  Run command:

  qemu-system-arm -M vexpress-a9 -cpu cortex-a9 -m 256 -sd disk.img -net
  nic,macaddr=52:54:00:fa:ce:13 -kernel vmlinuz-3.2.0-4-vexpress -initrd
  initrd.gz -append "root=/dev/ram" -display vnc=localhost:17 -net
  user,hostfwd=tcp::5022-:22 -append "console=ttyS0"

  I also tried this, with a different kernel & root:

  qemu-system-arm -kernel zImage -cpu arm1176 -m 256 -M versatilepb -no-
  reboot -serial stdio -hda rootfs-chromium.ext2 -append "root=/dev/sda"

  Thread dump:

  (lldb) thread list
  Process 34364 stopped
  * thread #1: tid = 0x135966, 0x00007fff89f4a746 
libsystem_kernel.dylib`__psynch_mutexwait + 10, queue = 
'com.apple.main-thread', stop reason = signal SIGSTOP
    thread #2: tid = 0x13598b, 0x00007fff89f4ae6a 
libsystem_kernel.dylib`__workq_kernreturn + 10
    thread #3: tid = 0x13598c, 0x00007fff89f4b662 
libsystem_kernel.dylib`kevent64 + 10, queue = 'com.apple.libdispatch-manager'
    thread #7: tid = 0x1359b2, 0x00007fff89f4acc2 
libsystem_kernel.dylib`__sigwait + 10
    thread #9: tid = 0x1359c1, 0x00000001091bc5d9
    thread #11: tid = 0x1359cc, 0x00007fff89f4a716 
libsystem_kernel.dylib`__psynch_cvwait + 10
    thread #12: tid = 0x1359da, 0x00007fff89f46a1a 
libsystem_kernel.dylib`mach_msg_trap + 10, name = 
'com.apple.audio.IOThread.client'

  -------
  * thread #1: tid = 0x135966, 0x00007fff89f4a746 
libsystem_kernel.dylib`__psynch_mutexwait + 10, queue = 
'com.apple.main-thread', stop reason = signal SIGSTOP
    * frame #0: 0x00007fff89f4a746 libsystem_kernel.dylib`__psynch_mutexwait + 
10
      frame #1: 0x00007fff8e05f779 libsystem_pthread.dylib`_pthread_mutex_lock 
+ 372
      frame #2: 0x000000010033e8e9 
qemu-system-arm`qemu_mutex_lock(mutex=<unavailable>) + 25 at 
qemu-thread-posix.c:76
      frame #3: 0x000000010002d742 qemu-system-arm`qemu_mutex_lock_iothread + 
98 at cpus.c:1137
      frame #4: 0x00000001002c84b5 qemu-system-arm`main_loop_wait [inlined] 
os_host_main_loop_wait(timeout=<unavailable>) + 191 at main-loop.c:242
      frame #5: 0x00000001002c83f6 
qemu-system-arm`main_loop_wait(nonblocking=<unavailable>) + 278 at 
main-loop.c:494
      frame #6: 0x000000010014961a qemu-system-arm`qemu_main [inlined] 
main_loop + 73 at vl.c:1789
      frame #7: 0x00000001001495d1 
qemu-system-arm`qemu_main(argc=<unavailable>, argv=<unavailable>, 
envp=<unavailable>) + 17057 at vl.c:4353
      frame #8: 0x000000010029b45e qemu-system-arm`-[QemuCocoaAppController 
startEmulationWithArgc:argv:](self=<unavailable>, _cmd=<unavailable>, 
argc=<unavailable>, argv=<unavailable>) + 30 at cocoa.m:897

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