site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=+qf3GJwO/teC70kx4OheiXQ6VV8emD77UDB9PY8cbPI=; b=OIb4eHgfaELmixucSZfuYcbk7J0VWqPZAkQpZFVt2PJhX+iqilND9qBXregpgjxY+2 Cw0UYuCW21xQzDQxPd70CKwMOm4IOJ9yldeN6Pp30ilnLKN+TYKdruORqnfFWkNbE8X8 lVFJoG8dXCDjugjJcCNo0RasXQxy9OkZVk/CA= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=nDT9vgd+8am5o6jfeHLt0Qdm/sVM8rjMzmD/KSo4q5xEIsYTaLPEpSYqNyi669ZS1k xp7KIW/w3bWijuJ3i/rK/XiEw/vxjz/z1rpSTTEq5a4qXJf7ilJyWWNXsCNXeBUzP6qf HMhj84YcIGQ/Hzu02PV2mf7HCmfmcByjKgi9M= The address in CR2, 0x3e75b8c0, is not valid. Given that you can't derive that value from the instruction which is executing at the time of the panic (0x0043145a is "mov (%edi,%ebx,1),%esi" and none of those values add up to give the CR2 value) I would assume a misprogrammed DMA transaction somehow. But I don't know. It's just a guess based on what you've posted. Someone else may post a much more brilliant and useful analysis. I hope so. Good luck. On Tue, Sep 29, 2009 at 5:46 PM, Duane Murphy <duanemurphy@mac.com> wrote:
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Hi Folks, I'm getting an intermittent kernel panic calling readBytes in an IOMemoryDescriptor. The underlying descriptor is an IOBufferMemoryDescriptor.
The kernel panic register dump and decoded stack trace are at the end of the message.
What would be the cause of a kernel panic like this?
The kext I am working with is a disk driver (subclass of IOBlockStorageDriver). This panic happens more often when the underlying disk is a Soft RAID disk.
The buffer that is failing is allocated on the IO path. I am not getting any errors for any allocations. I am working on changing this so that there should be less allocations on the IO path.
Could allocating this buffer on the IO path be the underlying cause of this panic?
Thanks for your insight to this difficult to decipher problem.
...Duane
- --- Mon Sep 28 15:13:08 2009 panic(cpu 0 caller 0x001AB0FE): Kernel trap at 0x0043145a, type 14=page fault, registers: CR0: 0x8001003b, CR2: 0x3e75b8c0, CR3: 0x01107000, CR4: 0x00000660 EAX: 0x00000280, EBX: 0x007cbe78, ECX: 0x079b6a88, EDX: 0x000f97cf CR2: 0x3e75b8c0, EBP: 0x5697fd88, ESI: 0x08dd5280, EDI: 0x3df8fa48 EFL: 0x00010202, EIP: 0x0043145a, CS: 0x00000008, DS: 0x01f80010 Error code: 0x00000000
0x12b4c6 <panic+422>: mov 0x4dd280,%eax 0x1ab0fe <kernel_trap+1450>: add $0xcc,%esp 0x1a1713 <trap_from_kernel+26>: mov %edi,%esp 0x43145a <IOGeneralMemoryDescriptor::dmaCommandOperation(unsigned long, void*, unsigned int) const+1260>: mov (%edi,%ebx,1),%esi 0x4315a4 <IOGeneralMemoryDescriptor::getPhysicalSegment64(unsigned long, unsigned long*)+160>: test %eax,%eax 0x430e56 <IOMemoryDescriptor::readBytes(unsigned long, void*, unsigned long)+76>: mov %edx,%ecx
...Duane
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