[Bug 1922391] Re: qemu-system-ppc assertion "!mr->container" failed

["Philippe Mathieu-Daudé" <1922391@bugs.launchpad.net>]

If the machine can not support more than 2GB, QEMU should report an error when the user tries to assign too many memory, not crash and let it figure out.
Setting the bug status to confirmed.

** Changed in: qemu
       Status: Invalid => Confirmed

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https://bugs.launchpad.net/bugs/1922391

Title:
  qemu-system-ppc assertion "!mr->container" failed

Status in QEMU:
  Confirmed

Bug description:
  Hi,

  I'm trying to run the NetBSD/macppc 8.2 installer (which is 32-bit ppc) in qemu-system-ppc version 5.2.0, and I'm hitting this assertion failure
  quite a bit into the "unpacking sets" part of the installation procedure,
  unpacking from the install iso image.

  Qemu is run on a NetBSD/amd64 9.1 host system.

  The asert message from qemu is

  assertion "!mr->container" failed: file "../softmmu/memory.c", line
  1739, function "memory_region_finalize"

  The stack backtrace from the core file (when built with debug symbols)
  is

  Core was generated by `qemu-system-ppc'.
  Program terminated with signal SIGABRT, Aborted.
  #0  0x00007a8f2596791a in _lwp_kill () from /usr/lib/libc.so.12
  [Current thread is 1 (process 1)]
  (gdb) where
  #0  0x00007a8f2596791a in _lwp_kill () from /usr/lib/libc.so.12
  #1  0x00007a8f259671ca in abort () from /usr/lib/libc.so.12
  #2  0x00007a8f258a8507 in __assert13 () from /usr/lib/libc.so.12
  #3  0x000000003e79d8a0 in memory_region_finalize (obj=<optimized out>)
      at ../softmmu/memory.c:1739
  #4  0x000000003e87aacc in object_deinit (type=0x7a8f2c280780, 
      obj=<optimized out>) at ../qom/object.c:671
  #5  object_finalize (data=0x7a8f2b62baa0) at ../qom/object.c:685
  #6  object_unref (objptr=0x7a8f2b62baa0) at ../qom/object.c:1183
  #7  0x000000003e87aa96 in object_property_del_all (obj=0x7a8f2b629000)
      at ../qom/object.c:623
  #8  object_finalize (data=0x7a8f2b629000) at ../qom/object.c:684
  #9  object_unref (objptr=0x7a8f2b629000) at ../qom/object.c:1183
  #10 0x000000003e79ab6b in memory_region_unref (mr=<optimized out>)
      at ../softmmu/memory.c:1787
  #11 0x000000003e7d8eb4 in address_space_unmap (
      as=as@entry=0x3f4731a0 <address_space_memory>, buffer=<optimized out>, 
      len=<optimized out>, is_write=<optimized out>, access_len=<optimized out>)
      at ../softmmu/physmem.c:3222
  #12 0x000000003e66389a in dma_memory_unmap (access_len=<optimized out>, 
      dir=<optimized out>, len=<optimized out>, buffer=<optimized out>, 
      as=<optimized out>)
      at /usr/pkgsrc/emulators/qemu/work/qemu-5.2.0/include/sysemu/dma.h:145
  #13 pmac_ide_atapi_transfer_cb (opaque=0x7a8f2ab4aef0, ret=<optimized out>)
      at ../hw/ide/macio.c:122
  #14 0x000000003e5b22a0 in dma_complete (ret=0, dbs=0x7a8f2bb4d380)
      at ../softmmu/dma-helpers.c:120
  #15 dma_blk_cb (opaque=0x7a8f2bb4d380, ret=0) at ../softmmu/dma-helpers.c:138
  #16 0x000000003e864ef7 in blk_aio_complete (acb=0x7a8f2af2be90)
      at ../block/block-backend.c:1412
  #17 0x000000003e9a9be1 in coroutine_trampoline (i0=<optimized out>, 
      i1=<optimized out>) at ../util/coroutine-ucontext.c:173
  #18 0x00007a8f25864150 in ?? () from /usr/lib/libc.so.12
  Backtrace stopped: Cannot access memory at address 0x7a8e137ec000
  (gdb) 

  
  I start qemu with this small script:

  ---
  #!/bin/sh

  MEM=3g
  qemu-system-ppc \
          -M mac99,via=pmu \
          -m $MEM  \
          -nographic \
          -drive id=hda,format=raw,file=disk.img \
          -L pc-bios \
          -netdev user,id=net0,hostfwd=tcp::2223-:22,ipv6=off \
          -net nic,model=rtl8139,netdev=net0 \
          -boot d \
          -cdrom NetBSD-8.2-macppc.iso
  ---

  and boot the install kernel with "boot cd:ofwboot.xcf".  If someone wants
  to replicate this I can provide more detailed instructions to repeat the
  procedure I used to start the install.

  Any hints about what more to look for?

  Regards,

  - Håvard

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