March 2008 - Darwin-kernel - lists.apple.com

Re: kernel panic on wakeup from hibernation
by Ratheesh Ramachandran 19 Mar '08

19 Mar '08

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Re: kernel panic on wakeup from hibernation
by Terry Lambert 18 Mar '08

18 Mar '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com void *my_malloc(int size, char *tag) { lock(); //calls semaphore_wait internally //get memory unlock(); } Notice, I am not checking the result of lock. Is my reasoning correct ie. consistent with how darwin works ? You are doing this wrong. -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… On Mar 18, 2008, at 1:33 AM, Ratheesh Ramachandran wrote: My thinking is that this is not a "regular" bad access scenario. But, something getting triggered by thread-safety issues (ie. the semaphore_wait's KERN_ABORTED error). I have a memory allocator function which looks something like this: If somebody does a thread_terminate() on one of the threads waiting on lock, thread-safety is compromised ie, multiple threads may access the critical section. The memory allocator may assign the same chunk of memory to different threads, one of them may free it, crashing the others. What is the best way to handle such a situation ? Should my_malloc() have returned if lock() returned a KERN_ABORTED ? Should it have retried ? Will KERN_ABORTED always imply thread termination ? See execargs_alloc in xnu in bsd/kern/kern_exec.c for an example of how to do an allocation using semaphore_wait() without breaking. Alternately, indicate that your thread us uninterruptible until it gets the lock (and make sure that you _get_ the lock sometime, or you will block forever -- better to just do it right). This email sent to site_archiver(a)lists.apple.com

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Re: kernel panic on wakeup from hibernation
by Ratheesh Ramachandran 18 Mar '08

18 Mar '08

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Re: kernel panic on wakeup from hibernation
by William Kucharski 18 Mar '08

18 Mar '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 2.0.0.12 (X11/20080228) Probably. I have another panic log which has 0x51e591c4. Once again, we're inside your kext but this time at address 0x4cde449a. William Kucharski _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Ratheesh Ramachandran wrote: Thu Mar 13 13:09:55 2008 panic(cpu 1 caller 0x001A8C8A): Kernel trap at 0x4cde449a, type 14=page fault, registers: CR0: 0x80010033, CR2: 0x51e591c4, CR3: 0x01067000, CR4: 0x000006e0 EAX: 0x4ced7800, EBX: 0x00000002, ECX: 0x00000000, EDX: 0x41414141 CR2: 0x51e591c4, EBP: 0x346afae8, ESI: 0x4ced7800, EDI: 0x346afcf8 EFL: 0x00010246, EIP: 0x4cde449a, CS: 0x00000004, DS: 0x346a000c Error code: 0x00000000 Without your code, I've no idea what it's trying to do at this location, but obviously some pointer or another isn't set correctly and you're blowing up; in this case you're (improperly) trying to dereference 0x51e591c4. >From this point it's up to you as you know what the code is at those locations, we don't. For reference, the first panic you posted had the fault at offset 0x192a6 within your kext, the second at offset 0xe49a. This email sent to site_archiver(a)lists.apple.com

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Re: kernel panic on wakeup from hibernation
by Michael Smith 18 Mar '08

18 Mar '08

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Re: kernel panic on wakeup from hibernation
by Ratheesh Ramachandran 17 Mar '08

17 Mar '08

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Re: kernel panic on wakeup from hibernation
by Garth Cummings 17 Mar '08

17 Mar '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi Ratheesh, On Mar 17, 2008, at 5:14 AM, William Kucharski wrote: That address looks like the character data "ilTi". Coincidence? --gc ____________________________________________________________________ Garth Cummings gcummings(a)apple.com Sr. Software Engineer Apple Developer Technical Support <http://developer.apple.com/technicalsupport> _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Assuming your extension is "com.effigent.kext.fpnew," the obvious question is what is your kext doing at 0x561292a6? It's trying to dereference the memory location 0x69546c69, but WHY? This email sent to site_archiver(a)lists.apple.com

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Re: kernel panic on wakeup from hibernation
by William Kucharski 17 Mar '08

17 Mar '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 2.0.0.12 (X11/20080228) It's trying to dereference the memory location 0x69546c69, but WHY? Backtrace, Format - Frame : Return Address (4 potential args on stack) 0x2eb33988 : 0x12b0e1 (0x457024 0x2eb339bc 0x13321a 0x0) 0x2eb339d8 : 0x1a8c8a (0x460550 0x561292a6 0xe 0x45fd00) 0x2eb33ab8 : 0x19eb67 (0x2eb33ad0 0x54238cc 0x2eb33ba8 0x561292a6) 0x2eb33ac8 : 0x561292a6 (0xe 0x48 0x10 0x10) 0x2eb33ba8 : 0x56111e7c (0x56154600 0x4a393b0 0x0 0x5) 0x2eb33bd8 : 0x561138bc (0x2eb33ebc 0x539504 0xb 0x2) 0x2eb33d78 : 0x1f5131 (0x2eb33dac 0x246 0x2eb33dd8 0x1d9207) 0x2eb33dd8 : 0x1eb98f (0x4a393b0 0x2eb33ebc 0x1 0x2eb33f54) 0x2eb33e68 : 0x38a35e (0x4923b10 0x2eb33ebc 0x0 0x2eb33f54) 0x2eb33f18 : 0x38a656 (0x2eb33f54 0x4923b10 0x803200 0x0) 0x2eb33f78 : 0x3dbe77 (0x44b8560 0x48d9520 0x48d9564 0xffffffff) 0x2eb33fc8 : 0x19f084 (0x48cfb00 0x0 0x1a20b5 0x48cfb00) No mapping exists for frame pointer Backtrace terminated-invalid frame pointer 0xb0102b98 Kernel loadable modules in backtrace (with dependencies): com.effigent.kext.fpnew(1.0b8)@0x56110000->0x56151fff William Kucharski _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Ratheesh Ramachandran wrote: Here's a panic log, if that helps. Although, every report I have received, has a different stack. Sun Mar 16 00:12:40 2008 panic(cpu 1 caller 0x001A8C8A): Kernel trap at 0x561292a6, type 14=page fault, registers: CR0: 0x8001003b, CR2: 0x69546c69, CR3: 0x01430000, CR4: 0x00000660 EAX: 0x00000276, EBX: 0x561fac10, ECX: 0x69546c61, EDX: 0x561546c4 CR2: 0x69546c69, EBP: 0x2eb33ba8, ESI: 0x56154600, EDI: 0x04a393b0 EFL: 0x00010297, EIP: 0x561292a6, CS: 0x00000008, DS: 0x00000010 Error code: 0x00000000 Assuming your extension is "com.effigent.kext.fpnew," the obvious question is what is your kext doing at 0x561292a6? This email sent to site_archiver(a)lists.apple.com

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Re: kernel panic on wakeup from hibernation
by Ratheesh Ramachandran 17 Mar '08

17 Mar '08

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Re: Problem with rc.common
by Michael Smith 15 Mar '08

15 Mar '08

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