Date: Mon, 15 Jan 1996 00:13:06 +1100 From: Bruce Evans <bde@zeta.org.au> To: freebsd-hackers@freefall.freebsd.org, garyj@munich.netsurf.de Cc: isdn@muc.ditec.de Subject: Re: Status of ISDN drivers Message-ID: <199601141313.AAA05940@godzilla.zeta.org.au>
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>I've become aware of a horrible bug somewhere in the ISDN code in the >last few days which apparently trashes the kernel stack somehow. Someone actually uses the isdn drivers in FreeBSD? :-) Perhaps they have been broken by recent cleanups. OTOH, perhaps they have been fixed by recent cleanups. What version are you using? >This bug is extrememly hard to track down beacuse the fault address is >totally bogus, e.g. 8:0. That's why I suspect that the stack is getting >trashed. It also crops up under circumstances which I can't identify. This fault address (but not a trashed stack) is normal for a call or jump through a null pointer. Calls through null pointers are very easy to debug since the return address is on the stack, while jumps through null pointers are hard to debug. Bruce
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