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Top Forums UNIX for Dummies Questions & Answers Collecting Shared Memory in core dump Post 302907536 by rupeshkp728 on Monday 30th of June 2014 11:09:52 AM
Old 06-30-2014
I tried setting the filter value to 3f but it did not help.

Core man page mentions "Memory-mapped I/O pages such as frame buffer are never dumped, and virtual DSO pages are always dumped, regardless of the coredump_filter value."

And through mmap I think we are doing Memory-mapped I/O pages and so we are not getting the shared memory details in core.

---------- Post updated at 08:39 PM ---------- Previous update was at 02:19 AM ----------

Is there any way through which shared memory or its details can be collected in core and accessed?
or
What is the appropriate way to debug and root cause applications which cores at shared memory?
 

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CRASHINFO(8)						    BSD System Manager's Manual 					      CRASHINFO(8)

NAME
crashinfo -- analyze a core dump of the operating system SYNOPSIS
crashinfo [-d crashdir] [-n dumpnr] [-k kernel] [core] DESCRIPTION
The crashinfo utility analyzes a core dump saved by savecore(8). It generates a text file containing the analysis in the same directory as the core dump. For a given core dump file named vmcore.XX the generated text file will be named core.txt.XX. By default, crashinfo analyzes the most recent core dump in the core dump directory. A specific core dump may be specified via either the core or dumpnr arguments. Once crashinfo has located a core dump, it analyzes the core dump to determine the exact version of the kernel that generated the core. It then looks for a matching kernel file under each of the subdirectories in /boot. The location of the kernel file can also be explicitly provided via the kernel argument. Once crashinfo has located a core dump and kernel, it uses several utilities to analyze the core including dmesg(8), fstat(1), iostat(8), ipcs(1), kgdb(1), netstat(1), nfsstat(1), ps(1), pstat(8), and vmstat(8). The options are as follows: -d crashdir Specify an alternate core dump directory. The default crash dump directory is /var/crash. -n dumpnr Use the core dump saved in vmcore.dumpnr instead of the latest core in the core dump directory. -k kernel Specify an explicit kernel file. SEE ALSO
textdump(4), savecore(8) HISTORY
The crashinfo utility appeared in FreeBSD 6.4. BSD
June 28, 2008 BSD
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