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[Qemu-devel] [Bug 1591611] Re: chroot using qemu-x86_64-static fails on


From: Timothy Pearson
Subject: [Qemu-devel] [Bug 1591611] Re: chroot using qemu-x86_64-static fails on ppc64el
Date: Thu, 16 Jun 2016 20:30:58 -0000

Yes, I saw that -- implementing the signal handlers fixed the hang and a
few other problems, but the assertion and subsequent SIGABORT/SIGSEGV
are still present.  Currently attempting to track down the fork()
issues.

-- 
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https://bugs.launchpad.net/bugs/1591611

Title:
  chroot using qemu-x86_64-static fails on ppc64el

Status in QEMU:
  New

Bug description:
  When attempting to use qemu-x86_64-static from qemu 2.5.0 on a ppc64el
  host to chroot into an amd64 environment, all commands fail with an
  assertion error.  /usr/bin/qemu-x86_64-static from the host was copied
  into the chroot /usr/bin, and the host has multiformat support in the
  kernel.

  Sample output illustrating the problem, as well as bash builtins
  working:

  # chroot /virtualbox/scratchdisks_local_001/amd64_chroot qemu-x86_64-static 
/bin/bash
  # ls
  bash: ../sysdeps/nptl/fork.c:136: __libc_fork: Assertion `({ __typeof 
(self->tid) __value; if (sizeof (__value) == 1) asm volatile ("movb 
%%fs:%P2,%b0" : "=q" (__value) : "0" (0), "i" (__builtin_offsetof (struct 
pthread, tid))); else if (sizeof (__value) == 4) asm volatile ("movl 
%%fs:%P1,%0" : "=r" (__value) : "i" (__builtin_offsetof (struct pthread, 
tid))); else { if (sizeof (__value) != 8) abort (); asm volatile ("movq 
%%fs:%P1,%q0" : "=r" (__value) : "i" (__builtin_offsetof (struct pthread, 
tid))); } __value; }) != ppid' failed.
  setup_frame: not implemented
  setup_frame: not implemented
  qemu: uncaught target signal 11 (Segmentation fault) - core dumped
  Segmentation fault
  setup_frame: not implemented
  setup_frame: not implemented
  # echo TEST
  TEST
  # cat test
  bash: ../sysdeps/nptl/fork.c:136: __libc_fork: Assertion `({ __typeof 
(self->tid) __value; if (sizeof (__value) == 1) asm volatile ("movb 
%%fs:%P2,%b0" : "=q" (__value) : "0" (0), "i" (__builtin_offsetof (struct 
pthread, tid))); else if (sizeof (__value) == 4) asm volatile ("movl 
%%fs:%P1,%0" : "=r" (__value) : "i" (__builtin_offsetof (struct pthread, 
tid))); else { if (sizeof (__value) != 8) abort (); asm volatile ("movq 
%%fs:%P1,%q0" : "=r" (__value) : "i" (__builtin_offsetof (struct pthread, 
tid))); } __value; }) != ppid' failed.
  qemu: uncaught target signal 11 (Segmentation fault) - core dumped
  Segmentation fault

  It is currently unknown if other host architectures (e.g. aarch64) are
  also affected.

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