Bus Error Exception
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challenged and removed. (July 2015) (Learn how and when to remove this template message) In computing, a bus error is a fault raised by hardware, notifying an bus error exception os161 operating system (OS) that a process is trying to access memory that
Address Error Exception
the CPU cannot physically address: an invalid address for the address bus, hence the name. In modern use system received a bus error exception cisco 2600 on most architectures these are much rarer than segmentation faults, which occur primarily due to memory access violations: problems in the logical address or permissions. On POSIX-compliant platforms, bus
Bus Error Linux
errors usually result in the SIGBUS signal being sent to the process that caused the error. SIGBUS can also be caused by any general device fault that the computer detects, though a bus error rarely means that the computer hardware is physically broken—it is normally caused by a bug in a program's source code.[citation needed] Bus errors may also be bus error c++ raised for certain other paging errors; see below. Contents 1 Causes 1.1 Non-existent address 1.2 Unaligned access 1.3 Paging errors 2 Example 3 References Causes[edit] There are at least three main causes of bus errors: Non-existent address[edit] Software instructs the CPU to read or write a specific physical memory address. Accordingly, the CPU sets this physical address on its address bus and requests all other hardware connected to the CPU to respond with the results, if they answer for this specific address. If no other hardware responds, the CPU raises an exception, stating that the requested physical address is unrecognized by the whole computer system. Note that this only covers physical memory addresses. Trying to access an undefined virtual memory address is generally considered to be a segmentation fault rather than a bus error, though if the MMU is separate, the processor can't tell the difference. Unaligned access[edit] Most CPUs are byte-addressable, where each unique memory address refers to an 8-bit byte. Most CPUs can access individual bytes from each memory address, but they generally
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memory size is not big enough?What does that error mean exactly?I am getting the same problem after running multiple "sort" in sequence Edward D'Souza 2009-07-24 22:53:00 UTC PermalinkRaw Message Post by c6shenWhen I run "sort" with default memory sizeI get a http://uw.cs.cs350.narkive.com/8dPWCUJl/bus-error-exception "Bus error exception, PC=0x90011380" panic.Is that expected because the memory size is not big enough?What does that error mean exactly?I am getting the same problem after running multiple "sort" in sequenceI'm not sure what the problem is, but I doubt it could be not havingenough memory; have you tried with 100 x default mem size? Also, doesyour kernel run the other test programs (matmult esp. andtlbfaulter,...) fine? How far did you get in the bus error assignment, and whatchange did you make to the kernel before you started getting this error?If you haven't looked a this already, it says it trap.c (before itpanics on the "Buss error exception.."/** This means you loaded invalid TLB entries, or* touched invalid parts of the direct-mapped* segments. These are serious kernel errors, so* panic.** The MIPS won't even tell you what invalid address* caused the bus error.*/panic("Bus error exception, PC=0x%x\n", tf->tf_epc);break; Kyle Spaans 2009-07-24 bus error exception 22:59:51 UTC PermalinkRaw Message Post by c6shenI get a "Bus error exception, PC=0x90011380" panic.It means you've touched a virtual memory address (0x90011380) that isn't mappedby the TLB or even directly mapped to physical memory. In this case, thatvirtual address is in KSEG0 (kernel space), but clearly doesn't correspond toany valid physical address.So yes, the specific error is because you don't have that much memory, but thesolution to your problem is _not_ increasing the amount of memory for OS161.:-PI ran into this once or twice, usually it because I had improperly filled myTLB or improperly copied data from an ELF file.gl & hf Ken Salem 2009-07-25 16:41:12 UTC PermalinkRaw Message A "bus error" means that the MMU generated in improperphysical address - improper usually means that it is toolarge (larger than the amount of physical memory).This means that the program (or kernel) used a virtual address,the virtual address did get translated by the MMU, but theresulting physical address is bad.If the virtual address is less than 0x8000000, which means itis translated through the TLB, this kind of error will ariseif you have loaded improper entries into the TLB.In your case, the virtual address is 0x90011380, which is inKSEG0. Those addresses are not translated through the TLB.Instead, the MMU will just translate that to physical0x10011380 by subtracting 0x80000000.So: the problem is wi