kern/47778: Kernel panics when accessing file system on faulty medium

[Aleksej Saushev <asau%inbox.ru@localhost>]

>Number:         47778
>Category:       kern
>Synopsis:       Kernel panics when accessing file system on faulty medium
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Apr 28 13:35:00 +0000 2013
>Originator:     asau%inbox.ru@localhost
>Release:        NetBSD 6.1_RC2
>Organization:
>Environment:
System: NetBSD lithium 6.1_RC2 NetBSD 6.1_RC2 (GENERIC) #1: Mon Mar 25 12:07:56 
MSK 2013 asau@lithium:/usr/obj/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
When accessing partially faulty medium (HDD), kernel panics with
the following backtrace (recorded manually since either savecore
or core dump seems not to function correctly):

...
printf_nolog
ufs_dirbadentry
ufs_lookup + 0x386
VOP_LOOKUP + 0x32
lookup_once + 0x176
namei_tryemulroot + 0x1c9
namei + 0x41
do_sys_stat + 0x47
...


>How-To-Repeat:
This is observed on partially faulty hardware, it is unclear how to
reproduce it.
>Fix:
None.