PANIC! UNIX System Crash Dump Analysis Handbook by Chris Drake

By Chris Drake

Designed as an creation to UNIX procedure crash unload research, this can be the 1st booklet to debate intimately UNIX process panics, crashes and hangs, their motives, what to do once they ensue, how one can gather information regarding them, the way to research that details, and the way to get the matter resolved. KEY themes: half One covers conception and instruments. half seems within UNIX, from the header documents to tape drives. half 3 presents real case reports of software program, undefined, facts, and process fault difficulties. For structures and community directors and technical aid engineers liable for holding UNIX computers and networks.

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In reading the strings output, it became apparent that the SC2000 was used for inventory control of some sort. There were a lot of drugstore items with pricing and stocking data. This alone narrowed down our list. Then, just when we were pretty sure which customer might have sent the tape, the customer's company name (the real name has been changed) appeared on our screen in banner-sized letters! # # # # # # # ####### # # # # #### # # # # # # #### # # ## ## # ## # # # # # # # ###### # ##### # # ###### ###### # # # # # # # # # # ###### ##### # # # # ##### # # # # # # # # # # # # # # #### #### # # # # #### # # #### ### # #### # # # #### As it turned out, the system's /etc/motd or message of the day file contained this banner, some welcoming messages, and the latest system news for folks to read when they log in.

Crashing Your Own System We've talked about what a system crash is. We've discussed how to use the UNIX savecore program to capture an image of memory when the system crashes. Shortly, we will discuss how to analyze the system crash dump savecore files. At this point, it is only fair to show you a fun and educational way to quickly crash your own system on purpose. If you have savecore set up properly, you'll have a set of files to experiment with during the following chapters. Needless to say, crashing a system is not something you should do lightly.

The fifth word contains 2f646576. " The dumpfile string starts at address dumpfile+0x10. The kernel string that we need to modify is actually stored in memory this way: Full word address Characters -----------------------dumpfile+10 = "/dev" dumpfile+14 = "/dsk" dumpfile+18 = "/c0t" dumpfile+1c = "3d0s" dumpfile+20 = "1" (The last character is followed by three nulls or zeros) Of these addresses, only the last three might require changing. The first two, representing the /dev/dsk portion of the device name, will not need to be changed.

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