pkg/44252: umounting ntfs-usb-disk after timeouts crashes system

[skwyrmin%sci.fi@localhost]

>Number:         44252
>Category:       pkg
>Synopsis:       umounting ntfs-usb-disk after timeouts crashes system
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 19 21:15:00 +0000 2010
>Originator:     skwyrmin
>Release:        5.0.2
>Organization:
>Environment:
NetBSD 5.0.2 NetBSD 5.0.2 (GENERIC) #0: Sat Feb 6 17:53:27 UTC 2010 buil
ds%b7.netbsd.org@localhost:/home/builds/ab/netbsd-5-0-2-RELEASE/i386/201002061851Z-obj/hom
e/builds/ab/netbsd-5-0-2-RELEASE/src/sys/arch/i386/compile/GENERIC i386
>Description:
After I/O-errors and/or timeouts with ntfs-3g (fuse) -mounted usb-disk, umount 
results as instant hard-reset. 
device: umass0: Iomega External HD, rev 2.00/0.00, addr 5
sd0 at scsibus0 target 0 lun 0: <SAMSUNG, HD103SI, > disk fixed sd0: 931 GB, 
16383 cyl, 16 head, 63 sec, 512 bytes/sect x 1953525168 sectors

system related:
usb0 at uhci0: USB revision 1.0
cpu0 at mainbus0 apid 0: Intel 686-class, 996MHz, id 0 x86a

version: ntfs-3g 1.1120

error messages prior to crash:
/netbsd: umass0: at uhub1 port 2 (addr 5) disconnected
/netbsd: sd0(umass0:0:0:0): generic HBA error
/netbsd: sd0: cache synchronization failed
/netbsd: sd0: detached
ntfs-3g[1932]: Error reading $Mft record(s): Input/output error
ntfs-3g[1932]: ntfs_mft_record_read failed: Input/output error
ntfs-3g[1932]: ntfs_attr_pread: ntfs_pread failed: Input/output error

messages are all prior to umount, crash happens with no logs, instant reset 
after pressing enter.
Umounting msdos-usbstick after timeouts works out fine.


>How-To-Repeat:

>Fix:
There is a patch for FreeBSD for similar symptoms, but I'm unable to find it 
again to include it here.