brett@solar.card.inpu.oz.au (Brett Sealey) (04/12/91)
Lately we have been playing with the "Beta SLIP for SunOS 4.0" written by
Rayan Zachariassen. We have been using it on Sun SPARCstation IPC's
running SunOS 4.1.1 (This may well be the problem).
Occasionally these machines crash with a "panic: mget" or even more rarely
a "panic: mfree" message.
Looking into the SLIP code I can see a MGET call within the tty_slip.c
file. MGET is a macro which can cause a "panic: mget" if the next mbuf on
the free list (mfree) is not correctly marked as "MT_FREE".
As I see it this is reasonable, the question is why does this condition
arise in the first place and, even more importantly, how can it be
prevented.
A comment in tty_slip.c indicates that :-
/* (SLIP_CLUSTERS doesn't work under SunOS 4.0) */
Is this true under SunOS 4.1.1?
If anyone has any clues as to what could be causing this rather
embarassing problem I'd be very keen to hear from them.
Thanks (in advance :-)
Brett Sealey
______________________________________________________________________________
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/__) /__) /_ / / brett@solar.card.inpu.oz.au
/__) / \ /__ / / Brett Sealey
______________________________________________________________________________davecb@yunexus.YorkU.CA (David Collier-Brown) (04/12/91)
brett@solar.card.inpu.oz.au (Brett Sealey) writes: | Lately we have been playing with the "Beta SLIP for SunOS 4.0" written by | Rayan Zachariassen. We have been using it on Sun SPARCstation IPC's | running SunOS 4.1.1 (This may well be the problem). | | Occasionally these machines crash with a "panic: mget" or even more rarely | a "panic: mfree" message. | | Looking into the SLIP code I can see a MGET call within the tty_slip.c | file. MGET is a macro which can cause a "panic: mget" if the next mbuf on | the free list (mfree) is not correctly marked as "MT_FREE". Oy veh ist mir! We suffered a minor variant of this on StunDOS 3.5, where one could get mgetclr panics by essmingly exhausting the mbuf space. This sounds similar enough to make me suspicious. Can someone comment on the version of tcp/ip code used in SunOS 4.1.1? We only have sources for 3.0, and that's maybe BSD4.2 at the best (:-() --dave -- David Collier-Brown, | davecb@Nexus.YorkU.CA | lethe!dave 72 Abitibi Ave., | Willowdale, Ontario, | Today's featured dish: CANADA. 416-223-8968 | Sun-dried alligator.
karl.kleinpaste@osc.edu (04/12/91)
brett@solar.card.inpu.oz.au writes: Lately we have been playing with the "Beta SLIP for SunOS 4.0" written by Rayan Zachariassen. We have been using it on Sun SPARCstation IPC's running SunOS 4.1.1 (This may well be the problem). Occasionally these machines crash with a "panic: mget" or even more rarely a "panic: mfree" message. I am using Rayan's code on a SunOS 4.1.1 Sun4/110. It works fine after you install Sun PatchID 100149-02, except for an occasional assertion panic of the following form when sliplogin goes down (in my case, when the modem line drops; I'm using it for dialup SLIP): | assertion failed: vp->v_stream == stp, file: ../../os/str_io.c, line: 609 | panic: assertion failed I've written a note about the problem to sunbugs@sun.com, but since it involves use of a non-standard driver, I doubt it'll get much attention. Before installing 100149-02, I consistently got "panic: mclput" whenever substantial amounts of data would begin to transfer. Note that there exist both -01 and -02 versions of this fix; install -02 to be maximally up-to-date. The README for -02 notes that the -01 version didn't deal in IP options properly. 100149-02.tar.Z can be ftp'd from saqqara.cis.ohio-state.edu:pub/slipware. --karl
lyndon@cs.athabascau.ca (Lyndon Nerenberg) (04/16/91)
karl.kleinpaste@osc.edu writes: >Note that there exist both -01 and -02 versions of this fix; install >-02 to be maximally up-to-date. The README for -02 notes that the -01 >version didn't deal in IP options properly. Note that there now exists a -03 version of said patch :-) >100149-02.tar.Z can be ftp'd from saqqara.cis.ohio-state.edu:pub/slipware. 100149-03.tar.Z can be ftp'd from ftphost.cs.athabascau.ca:sun-patches/ -- Lyndon Nerenberg VE6BBM / Computing Services / Athabasca University atha!cs.athabascau.ca!lyndon || lyndon@cs.athabascau.ca Packet: ve6bbm@ve6bbm.ab.can.noam The only thing open about OSF is their mouth. --Chuck Musciano
dave@fps.com (Dave Smith) (04/16/91)
In article <1991Apr12.140605.29819@oar.net> karl.kleinpaste@osc.edu writes: >brett@solar.card.inpu.oz.au writes: >I've written a note about the problem to sunbugs@sun.com, but since it >involves use of a non-standard driver, I doubt it'll get much >attention. Before installing 100149-02, I consistently got "panic: >mclput" whenever substantial amounts of data would begin to transfer. I have been using SLIP 4.0 on SLC's under 4.1.1 for about three weeks now and have run a goodly number of megabytes through them. I saw this mclput panic fairly frequently for a while and then saw a real high correlation with the answering side of the connection (I'm using dialup over T2500's) panicing when the connection was dropped. When I switched to V.42 mode the panic's went away. My feeling is that the utter garbage you get when the other side hangs up is confusing the TCP routines incredibly since they aren't used to being fed complete crap. -- David L. Smith FPS Computing, San Diego ucsd!celit!dave or dave@fps.com "It was time to stop playing games. It was time to put on funny hats and eat ice cream. Froggie played his oboe" - Richard Scarry