[Qemu-devel] [Bug 739785] Re: qemu-i386 user mode on ARMv5 host fails (bash: fork: Invalid argument)

[Ricardo Padilha]

Just to give some support to what Peter said, here is my experience with
the patch from #32.

I cross-compiled qemu 0.14.1 with the patch to ARMv5 and tried to run
the i386 linux binary for dropbox. Although I no longer see the fork
error message, the process gets stuck in an infinite loop running at
100% CPU. When started with -strace, this is where it gets stuck:

clock_gettime(0,1169900288,135693248,1,0,1169900372) = 0
futex(0x081683c4,FUTEX_PRIVATE_FLAG|FUTEX_WAIT,1,0x45bb4300,0x081683f0,135693296​)
 = -1 errno=110 (Connection timed out)
gettimeofday(1169900364,0,0,1,142600008,1169900392) = 0
futex(0x081683f0,FUTEX_PRIVATE_FLAG|FUTEX_WAKE,1,0x081683f0,0x087fe748,142600008​)
 = 0

This four line block gets repeated over and over again.

To the best of my knowledge, this is the same as the dreaded
"unsupported syscall 240" error, just with fancier output. My feeling is
that the patch only fixes some very small part of the problem.

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https://bugs.launchpad.net/bugs/739785

Title:
  qemu-i386 user mode on ARMv5 host fails (bash: fork: Invalid argument)

Status in QEMU:
  New

Bug description:
  Good time of day everybody,

  I have been trying to make usermode qemu on ARM with plugapps
  (archlinux) with archlinux i386 chroot to work.

  1. I installed arch linux in a virtuabox and created a chroot for it with 
mkarchroot. Transferred it to my pogo plug into /i386/
  2. I comiled qemu-i386 static and put it into /i386/usr/bin/
  ./configure --static --disable-blobs --disable-system 
--target-list=i386-linux-user
  make

  3. I also compiled linux kernel 2.6.38 with CONFIG_BINFMT_MISC=y and 
installed it.
  uname -a
  Linux Plugbox 2.6.38 #4 PREEMPT Fri Mar 18 22:19:10 CDT 2011 armv5tel 
Feroceon 88FR131 rev 1 (v5l) Marvell SheevaPlug Reference Board GNU/Linux

  4. Added the following options into /etc/rc.local
  /sbin/modprobe binfmt_misc
  /bin/mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
  echo 
':qemu-i386:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfb\xff\xff\xff:/usr/bin/qemu-i386:'
 >/proc/sys/fs/binfmt_misc/register

  5. Also copied ld-linux.so.3 (actually ld-2.13.so because ld-
  linux.so.3 is a link to that file) from /lib/ to /i386/lib/

  6.Now i chroot into /i386 and I get this:
  address@hidden i386]# chroot .
  [II aI hnve ao address@hidden /]# pacman -Suy
  bash: fork: Invalid argument

  7.I also downloaded linux-user-test-0.3 from qemu website and ran the test:
  address@hidden linux-user-test-0.3]# make
  ./qemu-linux-user.sh
  [qemu-i386]
  ../qemu-0.14.0/i386-linux-user/qemu-i386 -L ./gnemul/qemu-i386 i386/ls -l 
dummyfile
  BUG IN DYNAMIC LINKER ld.so: dl-version.c: 210: _dl_check_map_versions: 
Assertion `needed != ((void *)0)' failed!
  make: *** [test] Error 127

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