Kernel Panic in IOMemoryDescriptor
Kernel Panic in IOMemoryDescriptor
- Subject: Kernel Panic in IOMemoryDescriptor
- From: Duane Murphy <email@hidden>
- Date: Tue, 29 Sep 2009 17:46:13 -0700
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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,êx
0x1ab0fe <kernel_trap+1450>: add $0xcc,%esp
0x1a1713 <trap_from_kernel+26>: mov íi,%esp
0x43145a <IOGeneralMemoryDescriptor::dmaCommandOperation(unsigned
long, void*, unsigned int) const+1260>: mov (íi,ëx,1),%esi
0x4315a4 <IOGeneralMemoryDescriptor::getPhysicalSegment64(unsigned
long, unsigned long*)+160>: test êx,êx
0x430e56 <IOMemoryDescriptor::readBytes(unsigned long, void*,
unsigned long)+76>: mov íx,ìx
...Duane
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