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Retrieving symbol information from crash dump on Mac OS X


 
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Special Forums UNIX and Linux Applications Retrieving symbol information from crash dump on Mac OS X
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Old 02-04-2010
Retrieving symbol information from crash dump on Mac OS X

I am initiating the discussion.Hope everyone will add on to this.
Whenever any application crashes the system's crash reporter(/System/Library/CoreServices/Crash Reporter.app) creates a crash dump.A crash dump is the image of the state of the kernel that was in physical memory when the system failed.The crash log contains a stack trace with whatever program symbol information found in the application.And if the application has stripped of its debugginginformation(release build),no usefull information about the application's stack will be logged.In such situations we can use the atos("address to symbol") tool to convert these addresses back to their symbolic names. It may help us to diagnose and fix the underlying problem causing the crash. Because the TempConverter executable has no symbol information, program locations in the TempConverter code segment are listed as hexadecimal offsets. If enough debugging information is available, the tool also supplies the source file name and line number for the address.

Thanks
Eliza

Last edited by pludi; 02-04-2010 at 03:08 AM.. Reason: removed link
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cr_read(3)						     Library Functions Manual							cr_read(3)

NAME
cr_read - read from crash dump SYNOPSIS
DESCRIPTION
The function attempts to read the memory area defined by mem_page and num_pages into the buffer pointed to by buf from the crash dump opened using crash_cb. The starts at the position in the crash dump associated with the physical memory offset given by mem_page. If the physical memory page mem_page does not exist in the crash dump, sets *num_pages to 0 and returns 0. No data transfer will occur past a page of memory that does not exist in the crash dump. If the starting position, mem_page, plus the read length, *num_pages, goes past an area of memory that does not exist in the crash dump, sets *num_pages to the number of consecutive pages (starting at mem_page) actually read. RETURN VALUE
Returns zero for success. Other possible return values are described in libcrash(5). EXAMPLES
Assuming a process opened a crash dump, the following call to cr_read(3) reads the first pages from the crash dump into the buffer pointed to by mybuf: WARNINGS
may return fewer pages than requested due to implementation details. Always check the number of pages returned. If they are fewer than requested, issue a new request starting at the first page not returned. Only if that new request reads zero pages (or returns an error) can you be sure that the page was not dumped. AUTHOR
was developed by HP. SEE ALSO
cr_open(3), libcrash(5). cr_read(3)

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