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Date: Mon, 11 Aug 2008 09:35:42 +0100 From: Alan Jenkins <alan-jenkins@...fmail.co.uk> To: linux-kernel@...r.kernel.org Subject: Re: Segmentation fault details? Wang Yi wrote: > Hi, all! > > I'd like to know some details about segmentation fault. > What I mean is when a program accesses invalid memory area, it will > get a SIGSEGV signal from kernel, and a message "Segmentation fault". > > I also find that dmesg can show we something like this: > ProgramName[Pid]: segfault at xxxx eip xxxx esp xxxx error x > It is useful and provides the first-step information for further > debug/analysis. > > My question is how dmesg gets the information, and if there are any > "decent" way to get this and maybe more information(An "indecent" way > I came to is grep dmesg) > so that I can perform some basic auto analysis. > > Thank you. > > Leo Core dumps. You might also like to look at Ubuntu's "apport" bug reporting tool. IIRC the necessary kernel support is now in mainline. I believe it provides the option to dump core by piping it through an arbitrary program. The aim of apport is to capture these core dumps, notify the user, and give them the option to submit it to the Ubuntu developers. One advantage of this pipe technique is that you don't need to search the filesystem for core files. (They're dumped in the current directory, but you may not know what directory the program was in when it crashed). Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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