site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 I'm having a problem with an IOKit kext that I hope I would be able figure out using some typical memory management tools. Are there any special memory management tools or options (ie MallocDebug) that can help in the kernel. The problem only occurs at early startup (before Ethernet so I would have to debug with FireWire). It is random but consistent. That is, the panic doesn't always occur, but when it does it is always exactly the same. The panic always occurs in IOUSBControllerV3::HandlePowerChange(). My kext is not anywhere in the stack trace. Decoding the panic shows that the workloop in the CommandGate for the IOUSBControllerV3 instance is NULL. This causes IOEventSource::openGate() to panic. I'm looking for ideas for how to track down this problem. My suspicion is that I have some code that is clearing data in a stale pointer. However, I am open to other possible reasons for causing this problem. Thank you for any tips or ideas, ...Duane - --- 0x12b4c6 <panic+422>: mov 0x4dd280,%eax 0x1ab0fe <kernel_trap+1450>: add $0xcc,%esp 0x1a1713 <trap_from_kernel+26>: mov %edi,%esp 0x4263e7 <IOEventSource::openGate()+9>: mov (%eax),%edx 0x42752f <IOCommandGate::runAction(int (*)(OSObject*, void*, void*, void*, void*), void*, void*, void*, void*)+271>: add $0x3c,%esp 0x86221fe7 <IOUSBControllerV3::HandlePowerChange(unsigned long)+67>: leave 0x86221604 <IOUSBControllerV3::setPowerState(unsigned long, IOService*) +350>: xor %eax,%eax 0x41c606 <IOService::driverSetPowerState()+132>: mov %eax,%edi 0x41c99d <IOService::pmDriverCallout(IOService*)+37>: jmp 0x41c9b5 <IOService::pmDriverCallout(IOService*)+61> 0x13ebde <thread_call_thread+233>: movl $0x0,0x4(%esp) 0x1a14fc <call_continuation+28>: add $0x10,%esp -----BEGIN PGP SIGNATURE----- Version: PGP Desktop 9.10.0 (Build 500) Charset: US-ASCII wsBVAwUBSomLfErg9acQ4r2CAQjqcgf/XMCQvsc78WV5r2oRQN3AQPqp0dVJwJ7q CMMmoCCsEG37t/VsENv2iHT3pv2MXdeHQMGnQ0/ApLtvIfpfWT5PlVWp/F28ZaY8 hyYJKFNkGPazN6mGn+2xGEWq5T5zez0+GiMcW2/MuaW/w8SNCphV14kjj/jr7LiU 7qdzcshSxaqSShryzouIRp/FakOICPuwZ89fS5XFR0lcyUkH2nkDA43d3ajBvHaJ MK6nhjkoz3wFprsrjT/L+Zjib8V/A12XmIKvkX0Hz/cqQdxrdTJBbyIXqdmnQa2B FPU3xQbdibsKDNTwI9+JTsZWmNsqaUJ28+EVym6dzdKCkF3GtAsyyw== =0QyA -----END PGP SIGNATURE----- _______________________________________________ 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/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com