[Qemu-devel] [Bug 1684239] [NEW] vvfat core dump when enabling RW

[Rolando Zappacosta]

Public bug reported:

Hi guys,

I'm getting this qemu crash message:
>>> qemu-system-x86_64: /build/qemu-TziMIO/qemu-2.5+dfsg/block/vvfat.c:2290: 
>>> commit_direntries: Assertion `!strncmp(s->directory.pointer, "QEMU", 4)' 
>>> failed.
>>> Aborted (core dumped)
when launching qemu with this options for a VVFAT drive:
>>> -drive file=fat:rw:./ROOT,if=virtio
(same happens when using cache=none and/or if=ide)

"uname -a" system info is:
>>> Linux RJZ-WRK-LNX 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC 
>>> 2017 x86_64 x86_64 x86_64 GNU/Linux
and "qemu --version" is:
>>> QEMU emulator version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.10), Copyright (c) 
>>> 2003-2008 Fabrice Bellard

Not sure what logs to attach but I'll be glad to upload whatever needed.

Thanks in advance for you help,
Rolando

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: directory.pointer direntries vvfat

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https://bugs.launchpad.net/bugs/1684239

Title:
  vvfat core dump when enabling RW

Status in QEMU:
  New

Bug description:
  Hi guys,

  I'm getting this qemu crash message:
  >>> qemu-system-x86_64: /build/qemu-TziMIO/qemu-2.5+dfsg/block/vvfat.c:2290: 
commit_direntries: Assertion `!strncmp(s->directory.pointer, "QEMU", 4)' failed.
  >>> Aborted (core dumped)
  when launching qemu with this options for a VVFAT drive:
  >>> -drive file=fat:rw:./ROOT,if=virtio
  (same happens when using cache=none and/or if=ide)

  "uname -a" system info is:
  >>> Linux RJZ-WRK-LNX 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC 
2017 x86_64 x86_64 x86_64 GNU/Linux
  and "qemu --version" is:
  >>> QEMU emulator version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.10), Copyright 
(c) 2003-2008 Fabrice Bellard

  Not sure what logs to attach but I'll be glad to upload whatever
  needed.

  Thanks in advance for you help,
  Rolando

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