[issue1030] msdosfs umount panic

[Antonio Huete Jimenez (via DragonFly issue tracker)]

Antonio Huete Jimenez <tuxillo at quantumachine.net> added the comment:

Hi all,

Type: VM inside VMware
Release: 2.3.2 (Aug, 19)
Mem: 256MB

I've done the following:

> dd if=/dev/zero of=msdos.img bs=1m count=100
> sudo vnconfig vn0 msdos.img
> fdisk -i vn0
 (sysid=11 which is FAT)

> sudo newfs_msdos /dev/vn0
> sudo mount /dev/vn0 /mnt/test && cd /mnt/test
> 

In order to reproduce the issue, I wanted to fill up the FS to then umount it,
but instead I found:

- A lot of messages in syslog: hammer_ip_add_bulk: reservation failed
  > dmesg | grep ip_add_bulk |wc -l
      1676
- System almost unresponsive.
- Cannot break ^C (had to ^Z)

After supending the process, the system becomes intermittently unresponsive,
writting the hammer_ip_add_bulk message to syslog every 30 seconds more or less
(I think there's a sync by that time).

I will try to catch the kernel trace when that happens. I've been unable due
VMWare hotkeys, too bad.

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status: unread -> chatting

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<http://bugs.dragonflybsd.org/issue1030>
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