site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com You did not show show how you ran gdb. Are you running gdb -arch i386 /Volumes/KernelDebugKit/mach_kernel ? Paul On Mar 9, 2011, at 4:38 PM, mogambo wrote:

Hi there,

I am triaging a kernel crash caused by our vfs plugin. For some reason, the corefile was never saved on the panic server, but I have the panic log. So, I looked up the load address (0x49ea8000) of the extension from the following line in the panic log.

Kernel Extensions in backtrace (with dependencies): com.company.kext.fsd(2.5)@0x49ea8000->0x49f65fff

I ran the command to generate the symbol file with that load address: ./createsymbolfiles -s <sympath> fsd.kext

I loaded the symbol file in gdb and tried to decipher the panic log:

(gdb) add-symbol-file symbols/com.company.kext.fsd.sym : (gdb) add-symbol-file /Volumes/KernelDebugKit/mach_kernel : (gdb) x/i 0x49f1e3b1 0x49f1e3b1 <fsrwIssueRead+1663>: Cannot access memory at address 0x49f1e3b1 : (gdb) disass fsrwIssueRead Dump of assembler code for function fsrwIssueRead: 0x49f1dd32 <fsrwIssueRead+0>: Cannot access memory at address 0x49f1dd32

The OS X version is; apple$ sw_vers ProductName: Mac OS X ProductVersion: 10.6.4 BuildVersion: 10F569 apple$ uname -a Darwin MacProQA16.local 10.4.0 Darwin Kernel Version 10.4.0: Fri Apr 23 18:28:53 PDT 2010; root:xnu-1504.7.4~1/RELEASE_I386 i386

apple$ file /System/Library/Extensions/fsd.kext/Contents/MacOS/fsd /System/Library/Extensions/fsd.kext/Contents/MacOS/fsd: Mach-O universal binary with 2 architectures /System/Library/Extensions/fsd.kext/Contents/MacOS/fsd (for architecture ppc): Mach-O object ppc /System/Library/Extensions/fsd.kext/Contents/MacOS/fsd (for architecture i386): Mach-O object i386 apple$ file newsym/com.company.kext.fsd.sym newsym/com.company.kext.fsd.sym: Mach-O object i386

Am I missing something? I am pretty sure I have done this before to debug a kernel crash.

Thanks for your help. -m. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/nelson%40thursby.com

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