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An ISR 43xx or 44xx router may experience a "silent" reload -- ie: no crashinfo or core file generated. The only information regarding the reset is visible in "show version" where-in the reload reason is "LocalSoft" or "LocalSoftADR" (reset by software exception.) Eg: ------------------ show version ------------------ Last Reload Reason:Localsoft ------------------ show version ------------------ Last Reload Reason:LocalsoftADR
All of the following conditions must apply: 1. No crashinfo file is seen via "show bootflash: | inc crashinfo" and no core file is seen via "dir bootflash:/core/" 1a. No crashinfo file is seen via "show harddisk: | inc crashinfo" and no core file is seen via "dir harddisk:/core/" 2. The contents of the "bootflash:/tracelogs/ " directory don't indicate any specific software or hardware trigger 3. There are no specific logs prior the crash (eg: via remote syslog server) This bug only serves to document the fact that some kernel crashes are unable to generate a core file. A silent reload may occur, for which there are *multiple* possible triggers and bugs that could be the root cause.
The following IOS / ROMMON combinations have enhancements to improve the odds of writing a proper core file, so it is recommended to upgrade both to these minimum releases: For routers running IOS-XE 3: IOS: 3.16.7S ROMMON: 16.7(1r) For routers running IOS 16 Polaris: IOS: 16.6(6)/16.7(1) or newer. Recommend 16.9.4 with latest rommon ROMMON: 16.7(1r) or newer. Recommend latest rommon
This issue exists on the ASR1K and is resolved through a different defect. CSCuy74741 ASR1K- No kernel core produced on watchdog timeout
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