Panics and Logging Messages
Panics and Logging Messages
- Subject: Panics and Logging Messages
- From: Duane Murphy <email@hidden>
- Date: Tue, 23 Feb 2010 11:57:12 -0800
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I'm packing a couple of questions into this message.
I'm trying to track down the cause of an elusive kernel panic. I have
the target machine connected over firewire using fwkpfv. I've adjusted
the debugging strings in my kext to print using kprintf.
Question 1
I'm trying to determine which functions may have triggered the kernel
panic. When the kernel panic backtrace is printed to fwkpfv, there are
messages interspersed with the kernel panic. My expectation is that
while the back trace is being calculated, the other processor is still
running. These other messages are from that processor while the kernel
panic is being processed. Then the system is halted.
Is that are reasonable expectation? That the functions that are
printing in the middle of the kernel panic are likely not the cause of
the kernel panic itself?
My concern and reason for the question is what level of buffering may
be involved to delay the printing of the message?
Question 2
I've noticed this message after of the kernel panic logged to fwkpfv:
Attempting to commit panic log to NVRAM
EFI: couldn't save panic info (err = 80000009)
I've never noticed the second message before (EFI: etc). Can someone
translate that into English?
Thank you for your insight,
...Duane
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