kern/38292: "tail -f" causes system hang

[nakayama%NetBSD.org@localhost]

>Number:         38292
>Category:       kern
>Synopsis:       "tail -f" causes system hang
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 25 05:25:00 +0000 2008
>Originator:     Takeshi Nakayama
>Release:        NetBSD 4.99.58 20080325
>Organization:
Private
>Environment:
System: NetBSD lethe 4.99.58 NetBSD 4.99.58 (LETHE) #26: Tue Mar 25 13:52:03 
JST 2008 takeshi@lethe:/sys/arch/i386/compile/LETHE i386
Architecture: i386
Machine: i386 (Athlon64 X2 4400+)
>Description:
        I usually use "tail -f" to see build log files.
        When I use it on kernels after 4.99.56, then causes system hang
        completely (no response with ctl-meta-esc).
>How-To-Repeat:
        Use "tail -f logfile".
>Fix:
        N/A