panic when umounting a msdosfs mount: "VOP_STDCLOSE: BAD WRITECOUNT 0xf2629e68 0"

[Rumko]

Matthew Dillon wrote:

> 
> :After playing with my mobile phone (mounted it's memory card with mount -t
> :msdosfs), a umount triggered the panic (well, I did run sync a second or 2
> :before doing a umount). The memory dump is at leaf:~rumko/crash/19.05.2008/
> :and the backtrace (including the kernel message buffer that kgdb prints) is
> :here:
> :
> :Unread portion of the kernel message buffer:
> :panic: VOP_STDCLOSE: BAD WRITECOUNT 0xf2629e68 0
> : 
> :mp_lock = 00000001; cpuid = 1
> :boot() called on cpu#1
> : 
> :syncing disks... 3 ad8: WARNING - SETFEATURES SET TRANSFER MODE taskqueue
> :timeout - completing request directly
> :ad8: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=12361855
> : 
> :done
> :--
> :Regards,
> :Rumko
> 
>     Did you mount it normally or use options like -o ro (read-only), or
>     -u (update) at any point ?
> 
>     And, is the panic reproducable?
> 
> -Matt
> Matthew Dillon
> <dillon at backplane.com>

If I remember correctly, I did mount it readonly, then did a umount -u, copied
a file, ran sync (I'm not sure, but could've been more than one time) and
tried umount-ing it.

As for being reproducable ... I can try it again, if the need to reproduce it
arises.
-- 
Regards,
Rumko