[Qemu-devel] [Bug 1094950] Re: crash at qemu_iohandler_poll (iohandler.c:124) on macos 10.8.2

[Christopher Mason]

Using qemu master rev dbd99ae..25bbf61 configured with:

./configure --disable-sdl --disable-kvm --enable-cocoa  --enable-debug
--extra-cflags=-g --extra-ldflags=-g

(I'm using clang 4.1 now.  Should I be using clang or gcc 4.2? Are these
the right config args?)

(gdb) b sigfd_handler
Breakpoint 1 at 0x1001c098d: file main-loop.c, line 41.

(gdb) r -nographic -M versatilepb -kernel vmlinuz-2.6.32-5-versatile -initrd 
initrd.img-2.6.32-5-versatile -hda debian_squeeze_armel_standard.qcow2 -append 
"root=/dev/sda1 console=ttyAMA0"
...
Breakpoint 1, sigfd_handler (opaque=0x3) at main-loop.c:41
41          int fd = (intptr_t)opaque;
(gdb) bt
#0  sigfd_handler (opaque=0x3) at main-loop.c:41
#1  0x00000001001baaee in qemu_iohandler_poll (readfds=0x100a0938c, 
writefds=0x100a0940c, xfds=0x100a0948c, ret=3) at iohandler.c:124
#2  0x00000001001c00bb in main_loop_wait (nonblocking=0) at main-loop.c:418
#3  0x000000010027bde4 in main_loop () at vl.c:1765
#4  0x00000001002765c2 in qemu_main (argc=12, argv=0x7fff5fbff340, 
envp=0x7fff5fbff3a8) at vl.c:4014
#5  0x0000000100239a13 in main (argc=12, argv=0x7fff5fbff340) at ui/cocoa.m:884
Current language:  auto; currently minimal
(gdb) p io_handlers
$1 = {
  lh_first = 0x102102ab0
}
(gdb) p * io_handlers.lh_first
$2 = {
  fd_read_poll = 0x1001fad60 <stdio_read_poll>, 
  fd_read = 0x1001fae20 <stdio_read>, 
  fd_write = 0, 
  opaque = 0x1021029c0, 
  next = {
    le_next = 0x102100000, 
    le_prev = 0x100a09368
  }, 
  fd = 0, 
  deleted = false
}
(gdb) p * io_handlers.lh_first->next.le_prev
$3 = (struct IOHandlerRecord *) 0x102102ab0
(gdb) p * io_handlers.lh_first->next.le_next
$4 = {
  fd_read_poll = 0, 
  fd_read = 0x1001c0970 <sigfd_handler>, 
  fd_write = 0, 
  opaque = 0x3, 
  next = {
    le_next = 0x0, 
    le_prev = 0x102102ad0
  }, 
  fd = 3, 
  deleted = false
}

(gdb) c

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x0000000102100040
0x0000000102100040 in ?? ()
(gdb) bt
#0  0x0000000102100040 in ?? ()
#1  0x00000001001baaee in qemu_iohandler_poll (readfds=0x100a0938c, 
writefds=0x100a0940c, xfds=0x100a0948c, ret=3) at iohandler.c:124
#2  0x00000001001c00bb in main_loop_wait (nonblocking=0) at main-loop.c:418
#3  0x000000010027bde4 in main_loop () at vl.c:1765
#4  0x00000001002765c2 in qemu_main (argc=12, argv=0x7fff5fbff340, 
envp=0x7fff5fbff3a8) at vl.c:4014
#5  0x0000000100239a13 in main (argc=12, argv=0x7fff5fbff340) at ui/cocoa.m:884

(gdb) p io_handlers
$5 = {
  lh_first = 0x102102ab0
}
(gdb) p * io_handlers.lh_first
$6 = {
  fd_read_poll = 0x1001fad60 <stdio_read_poll>, 
  fd_read = 0x1001fae20 <stdio_read>, 
  fd_write = 0, 
  opaque = 0x1021029c0, 
  next = {
    le_next = 0x102100000, 
    le_prev = 0x100a09368
  }, 
  fd = 0, 
  deleted = false
}
(gdb) p * io_handlers.lh_first->next.le_next
$8 = {
  fd_read_poll = 0, 
  fd_read = 0x1001c0970 <sigfd_handler>, 
  fd_write = 0, 
  opaque = 0x3, 
  next = {
    le_next = 0x0, 
    le_prev = 0x102102ad0
  }, 
  fd = 3, 
  deleted = false
}
(gdb) p * io_handlers.lh_first->next.le_prev
$9 = (struct IOHandlerRecord *) 0x102102ab0

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https://bugs.launchpad.net/bugs/1094950

Title:
  crash at  qemu_iohandler_poll (iohandler.c:124) on macos 10.8.2

Status in QEMU:
  New

Bug description:
  I'm seeing consistent hangs / crashes on MacOS 10.8.2 with 1.3.0.
  I've tried both gcc-4.2 and clang.  I've tried a half a dozen
  different images/kernels.

  I configured qemu like this:

  ./configure --disable-sdl --disable-kvm --enable-cocoa --cc=gcc-4.2
  --host-cc=gcc-4.2 --enable-debug   --extra-cflags=-g   --extra-
  ldflags=-g

  And ran it like this:

  qemu-system-arm -nographic -M versatilepb -kernel
  vmlinuz-2.6.32-5-versatile -initrd initrd.img-2.6.32-5-versatile -hda
  debian_squeeze_armel_standard.qcow2 -append "root=/dev/sda1
  console=ttyAMA0"

  With images, kernel, and initrd described here:

  http://psellos.com/2012/08/2012.08.qemu-arm-osx.html

  And I get:

  Program received signal EXC_BAD_ACCESS, Could not access memory.
  Reason: KERN_PROTECTION_FAILURE at address: 0x000000010142f2d0
  0x000000010142f2d0 in ?? ()

  (gdb) bt
  #0  0x000000010142f2d0 in ?? ()
  #1  0x000000010016e209 in qemu_iohandler_poll (readfds=0x10097ca00, 
writefds=0x10097ca80, xfds=0x10097cb00, ret=4) at iohandler.c:124
  #2  0x0000000100172acf in main_loop_wait (nonblocking=0) at main-loop.c:418
  #3  0x0000000100207bbf in main_loop () at vl.c:1765
  #4  0x000000010020e7b0 in qemu_main (argc=12, argv=0x7fff5fbff360, 
envp=0x7fff5fbff3c8) at vl.c:3992
  #5  0x00000001001d6013 in main (argc=12, argv=0x7fff5fbff360) at 
ui/cocoa.m:884
  (gdb) frame 1
  #1  0x000000010016e209 in qemu_iohandler_poll (readfds=0x10097ca00, 
writefds=0x10097ca80, xfds=0x10097cb00, ret=4) at iohandler.c:124
  124                   ioh->fd_read(ioh->opaque);
  Current language:  auto; currently c
  (gdb) p ioh
  $1 = (IOHandlerRecord *) 0x10142f110
  (gdb) p *ioh
  $2 = {
    fd_read_poll = 0, 
    fd_read = 0x10017212b <sigfd_handler>, 
    fd_write = 0, 
    opaque = 0x3, 
    next = {
      le_next = 0x0, 
      le_prev = 0x105d00bc0
    }, 
    fd = 3, 
    deleted = false
  }

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