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UNIX for Dummies Questions & Answers
What's the difference between Segmentation fault and Bus error and Illegal...?
Post 302179558 by lakeat on Friday 28th of March 2008 03:25:51 AM
03-28-2008
What's the difference between Segmentation fault and Bus error and Illegal...?
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crash
crash(8v) crash(8v) Name crash - what happens when the system crashes Description This section explains what happens when the system crashes and shows how to analyze crash dumps. When the system crashes voluntarily it prints a message on the console in the form: panic: explanation The system takes a dump on a mass storage peripheral device or the network, and then invokes an automatic reboot procedure as described in Unless there is some unexpected inconsistency in the state of the file systems due to hardware or software failure, the system then resumes multi-user operations. If auto-reboot is disabled, the system halts at this point. The system has a large number of internal consistency checks; if one of these fails, it prints a short message indicating which one failed. The most common cause of system failures is hardware failure. In all cases there is the possibility that hardware or software error pro- duced the message in some unexpected way. These messages are the ones you are likely to encounter: IO err in push hard IO err in swap The system encountered an error when trying to write to the paging device or an error in reading critical information from a disk drive. Fix your disk if it is broken or unreliable. timeout table overflow Due to the current data structure, running out of entries causes a crash. If this happens, make the timeout table bigger. Exception Condition An unexpected system error has occurred. The exception types are as follows: --------------------------------------------------------------- Mnemonic Description --------------------------------------------------------------- INT External interrupt MOD TLB modification exception TLBL TLB miss exception (load or instruction fetch) TLBS TLB miss exception (store) AdEL Address error exception (load or instruction fetch) AdES Address error exception (store) IBE Bus error exception (for an instruction fetch) DBE Bus error exception (for a data load or store) Sys Sys call exception Bp Breakpoint exception CpU Coprocessor unusable exception Ovf Arithmetic overflow exception --------------------------------------------------------------- KSP not valid This indicates either a problem in the system or failing hardware. init died The system initialization process has exited. The only solution is the automatic reboot procedure described in Until this is done, new users cannot log in. When the system crashes, it attempts to write an image of memory into the back end of the primary swap area. After the system is rebooted, the program runs and preserves a copy of this core image and the current system in a specified directory for later access. See for details. To analyze a dump, you should begin by running with the flag on the core dump. See Also dbx(1), reboot(8), savecore(8) RISC crash(8v)