Date: Mon, 30 Oct 1995 00:46:46 +0200 From: Heikki Suonsivu <hsu@cs.hut.fi> To: peter@haywire.dialix.com (Peter Wemm) Cc: freebsd-current@freebsd.org Subject: Re: load related problem or my compilation ? Message-ID: <199510292246.AAA09796@shadows.cs.hut.fi> In-Reply-To: peter@haywire.dialix.com's message of 29 Oct 1995 22:23:18 %2B0200
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>mid-fligth. I have had similar panic problems with a slow (38.4k) leased
>line which certainly does not loose carrier, and it panics sometimes,
>usually when a load peak suddenly arrives after idling (start up a heavy X
>program or like).
Hmm.. Are you using Bruce's cy driver?
On the leased line no, on terminal servers yes. I don't know for sure if
the problems are same.
I have this vague recollection that his cypoll and siopoll hooks are
launching into the tty sybsystem code at splsofttty(). I am not sure,
but I dont think that splsofttty() would mask the networking code,
which could mean that it might be possible for the networking code to
be started up on the return from some hardware interrupt that had
preempted the tty code.
The mbuf is taken within splimp(), and then accessed outside it after
taking it (in ppp_dequeue). I don't have the kernel experience to tell
what should be done.
I wonder if what you are seeing is the cypoll() call to pppstart() being
interrupted by networking code, which is manipulating the mbuf
pointers?
Check out the dumps, they will probably tell you more than I can tell you
:-)
--
Heikki Suonsivu, T{ysikuu 10 C 83/02210 Espoo/FINLAND,
hsu@cs.hut.fi home +358-0-8031121 work -4513377 fax -4555276 riippu SN
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