Find out what's causing your Mac to panic and what to do about it
To start the conversation again, simply ask a new question. Where will I locate the log for a kernel panic in OS X Posted on Apr 26, AM. Page content loaded.
Apr 26, AM in response to john g from columbus In response to john g from columbus. Apr 26, AM. Apr 26, AM in response to arthur In response to arthur.
Spotlight is, by design, not good at finding System files, and I don't think it will find anything inputted like that. Thank you-that got me to the diagnostic reports. My difficulty now is I do not know where to look for info I can understand regarding what might be causing a "kernel panic". When I research on Apple site, I see info that says following a panic, when the Mac restarts, there will be a message telling me of the software which triggered the panic.
I have not seen that message. Apr 27, AM. Apr 27, AM in response to john g from columbus In response to john g from columbus. Post the crashdump here, and maybe someone will reconize the cause, however, crashdumps are not easy to decode, and a lot of times they just say the kernel process paniced which often means a 3rd party kernel extension was the cause, and in some situations, bad RAM, especially if new 3rd party RAM was recently installed, and very rarely Apple RAM, but mostly it is 3rd party kernel extensions. You might also add a copy of the EtreCheck output which will list 3rd party additions, and someone may notice a problematic bit of code.
The panic log has the word " panic" a few lines into the log, has a dump of the CPU registers, the backtrace, the loaded kexts, and your hardware configuration. It will not tell you definitively what caused it. Select the entire log, copy it, and paste it here. More Less. Before looking at log itself, I had better explain what has happened to the traditional log system, and how the new logs are so different from what we used in El Capitan and earlier. Traditional logs are text files, and seriously inefficient. They waste a lot of storage space for limited and highly unstructured data, and impose significant overhead on processes which need to write to them.
The new system was designed to address those shortcomings, and provide a modern, structured, and efficient log system. As you will see, it has met those goals, but at a significant cost in terms of usability. If you know that your Mac had a kernel panic at this morning, and restarted at , then it would be really helpful to be able to export the section of logs from, say, to , then examine it in Console.
Retrieving console logs on Mac
The above command should dump around 20 MB of log starting from local Mac time into the file logcoll. In practice, it ignores the size given, and possibly even the start time, and you just end up with a vast file which is a pain to do anything with. It would be really good if the options worked, and perhaps even supported an --end time to be specified.
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This leaves the log show command, which is of greatest use for historical data. Although it does support some other options, for our purposes this will normally be used with the following: log show --predicate  --style syslog --start  --end  --info --last  where  represent values which we supply. At a simple level, these are straightforward, but can get elaborate and at times confusing. The main types of predicate which you are likely to use are:. These are very valuable for limiting the amount of output, but you will then have to work out the correct values to use.
This is an alternative to giving start and end times. The output from log show is often then piped through additional tools such as grep and cut , and may then be poured into a text file.
OS X: Troubleshooting Kernel Panics – The Mac Observer
We shall see these in examples below. TimeMachine"' --info grep 'upd: ' cut -c , This filters log entries to those for the Time Machine subsystem, and accesses them down to info level. Note how the predicate is given inside single quotes, to ensure that the command line copes with its spaces properly. TimeMachine"' --style syslog --info --last 3h cut -c , This uses the same predicate, but works on the syslog format output, and only uses log entries over the last 3 hours.
The final cut gives a slightly different layout. If you want to look in detail at a relatively short section of log, use log show --style syslog --start ' ' --end ' ' --info. This does not use a predicate filter, so will result in many log entries, but does restrict the time window. Note that the dates and times are given in single quotes to ensure that they are properly handled. Bear in mind that the logs can contain 70, or more entries in any given minute, so these could still be very hefty log excerpts.
To look for a system waking up , log show --predicate 'eventMessage contains "System Wake"' --style syslog --info cut -c , You can then look at errors immediately before and after that date and time, e. If you come up with some neat log commands, and solutions, please share them here. I will make those tools available here. Like Liked by 1 person. More specifically, have you tried to dump some logs to a syslog service? Like Like. Hi Useful post.