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7500 Series RoutersTroubleshoot and AlertsTroubleshooting TechNotes SegV Exceptions Download Print Available Languages Download Options PDF (79.9 KB) View with Adobe Reader on a variety of devices ePub (69.0 KB) View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone Mobi (Kindle) (63.4 KB) View on Kindle device or Kindle app on multiple devices Updated:May 31, 2016 Document ID:15069 ContentsIntroductionPrerequisitesRequirementsComponents UsedConventionsIdentify the Cause of the ReloadCause of SegV ExceptionsTroubleshootInformation to Collect if You Open a TAC CaseRelated Information Introduction This document explains what causes segmentation violation (SegV) exceptions on routers, and how to troubleshoot them. Cisco recommends that you read Troubleshooting Router Crashes before you proceed with this document. Prerequisites Requirements There are no specific requirements for this document. Components Used The information in this document is based on these software and hardware versions: All Cisco IOS® software versions Cisco 1700 Series Routers Cisco 2600 Series Routers Cisco 3600 Series Routers Cisco 3700 Series Routers Cisco 4500 Series Routers Cisco 4700 Series Routers Cisco AS5300 Series Routers Cisco MC3810 Series Routers Cisco 7200 Series Routers Cisco 7500 Series Routers Note:This document does not apply to Cisco Catalyst switches or MGX platforms. The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command before you use it. Conventions For more information on document conventions, refer to the Cisco Technical Tips Conventions. Identify the Cause of the Reload If you do not power-cycle or manually reload the router, the show version output displays this: Router uptime is 2 days, 3 hours, 5 minutes System restarted by error - a SegV exception, PC 0x80245F7C System image file is "flash:c2600-js-mz.120-9.bin" or Router uptime is 11 hours, 38 minutes System returned to ROM by error - a SegV exception, PC 0x80249B0C System imag
article by adding citations to reliable sources. Unsourced material may be challenged and removed. (November 2011) (Learn how and when to remove this template message) In computing, a segmentation fault (often shortened to segfault) or access violation is a fault raised by hardware with memory protection, notifying an operating system (OS) about a memory access violation; on x86 computers this is a form of general protection fault. The OS kernel will, in response, usually http://www.cisco.com/c/en/us/support/docs/routers/7500-series-routers/15069-crashes-segv.html perform some corrective action, generally passing the fault on to the offending process by sending the process a signal. Processes can in some cases install a custom signal handler, allowing them to recover on their own,[1] but otherwise the OS default signal handler is used, generally causing abnormal termination of the process https://en.wikipedia.org/wiki/Segmentation_fault (a program crash), and sometimes a core dump. Segmentation faults are a common class of error in programs written in languages like C that provide low-level memory access. They arise primarily due to errors in use of pointers for virtual memory addressing, particularly illegal access. Another type of memory access error is a bus error, which also has various causes, but is today much rarer; these occur primarily due to incorrect physical memory addressing, or due to misaligned memory access – these are memory references that the hardware cannot address, rather than references that a process is not allowed to address. Newer programming languages may employ mechanisms designed to avoid segmentation faults and improve memory safety. For example, the Rust programming language employs an 'Ownership'[2] based model to ensure memory safety.[3] Contents 1 Overview 2 Causes 3 Handling 4 Examples 4.1 Writing to read-only memory 4.2 Null pointer dereference 4.3 Buffer overflow 4.4 Stack
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