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[Qemu-devel] [Bug 1404690] Re: Qemu crashes with chrooted m68k


From: Thomas Huth
Subject: [Qemu-devel] [Bug 1404690] Re: Qemu crashes with chrooted m68k
Date: Wed, 11 Jan 2017 21:00:49 -0000

Peter's patch had been included here:
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=1669add752d9f2928
==> Fix released

** Changed in: qemu
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1404690

Title:
  Qemu crashes with chrooted m68k

Status in QEMU:
  Fix Released

Bug description:
  I'm using qemu-m68k 2.2.0 to chroot into a m68k coldfire linux, which
  works fine on the coldfire machine.

  I've been able to use binfmt_msc and used the above code to use qemu
  with strace:

  #include <unistd.h>
  #include <string.h>

  int main(int argc, char **argv, char **envp) {
          char *newargv[argc + 4];

          newargv[0] = argv[0];
          newargv[1] = "-cpu";
          newargv[2] = "cfv4e";
          newargv[3] = "-strace";

          memcpy(&newargv[4], &argv[1], sizeof(*argv) * (argc - 1));
          newargv[argc + 3] = NULL;
          return execve("/usr/bin/qemu-m68k", newargv, envp);
  }

  Everything works fine. I can run bash, busybox, ash, but when I try to
  run a ls or just type an invalid command, I got the attached sequence
  of messages, which end like so:

  11351 waitpid(-1,0xf6fffa00,0x3) = -1 errno=10 (No child processes)
  qemu: fatal: Illegal instruction: 0000 @ f6fffa30
  D0 = ffffffff   A0 = f67dcf50   F0 = 0000000000000000 (           0)
  D1 = 0000000a   A1 = f66e0898   F1 = 0000000000000000 (           0)
  D2 = f6fffaa8   A2 = f67df268   F2 = 0000000000000000 (           0)
  D3 = 00000000   A3 = 00000000   F3 = 0000000000000000 (           0)
  D4 = 00000008   A4 = 800026c4   F4 = 0000000000000000 (           0)
  D5 = 00000000   A5 = f67d98e0   F5 = 0000000000000000 (           0)
  D6 = f6fffaa8   A6 = f6fffa7c   F6 = 0000000000000000 (           0)
  D7 = 00000002   A7 = f6fffa24   F7 = 0000000000000000 (           0)
  PC = f6fffa30   SR = 0000 ----- FPRESULT =            0
  Aborted

  How can I debug it further to try to figure out if this is a qemu
  issue or not? Thanks

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