kern/99607: pppd fail kernel from more interrupts in serilal port (/dev/cuad0)

[Den]

>Number:         99607
>Category:       kern
>Synopsis:       pppd fail kernel from more interrupts in serilal port (/dev/cuad0)
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jun 29 14:30:16 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Den
>Release:        6.1-RELEASE-p2
>Organization:
>Environment:
FreeBSD master.local 6.1-RELEASE-p2 FreeBSD 6.1-RELEASE-p2 #4: Sat Jun 24 23:48:55 YEKST 2006     root at master.local:/usr/src/sys/i386/compile/MY  i386

>Description:
Use pppd fail kernel from more interrupts in serilal port (/dev/cuad0)
>How-To-Repeat:
Use pppd and modem dial-up (50kb/s, serial port /dev/cuad0) from conect ISP. Get more messages:
Jun 29 20:12:13 master kernel: sio0: 16 more interrupt-level buffer overf
lows (total 16)
Jun 29 20:12:14 master kernel: sio0: 83 more interrupt-level buffer overflows (t
otal 99)
Jun 29 20:12:16 master kernel: sio0: 16 more interrupt-level buffer overflows (t
otal 115)
Jun 29 20:12:37 master kernel: sio0: 16 more interrupt-level buffer overflows (t
otal 131)
Jun 29 20:12:48 master kernel: sio0: 16 more interrupt-level buffer overflows (t
otal 147)
And Fail kernel , frozen OS.
>Fix:
Don't use pppd, clear  kernel, no pppd in her.
>Release-Note:
>Audit-Trail:
>Unformatted: