Messages in this thread | | | Subject | Re: 2.0.35 and 2.0.36-pre7 w/multicast dies | Date | Fri, 11 Sep 1998 12:36:01 +0200 | From | Olaf Titz <> |
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> > > kernel: net_timer: timer expired - reason 0 is unknown > wasn't recompiled. I use cipe (the Crypto IP Encapsulation) on this box to > have a VPN across the internet, and I didn't recompile it after enabling > multicasting. > As adding multicasting grows the struct sock by 16 bytes, the cipe module and > the kernel were exchanging mismatched struct sock. Hence the strange things > on 2.0.3{5,6-pre7}. I'm amazed it didn't die more quickly of didn't oops...
I had precisely the same problem over a year ago, when I developed that module, and made exactly the same config change. ;-) Only that I blamed that on a possible bug in CIPE which I hunted for a day or two to no effect...
The timer field in struct sock gets overwritten with some other stuff by the mismatching module and the kernel tries to invoke a bogus timer. If it was another field, it could have been a series of Oopses, kernel panic, etc.
> Sometimes I just hate modules :-)
This way I learnt what MODVERSIONS is for. It is additional hassle to compile but it prevents this kind of errors...
olaf
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