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PostPosted: Tue Feb 11, 2020 9:11 am 
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A two-part question:

Following a kernel panic, does the OS automatically invoke the fsck process when restarting, or...

if the user has to invoke a fsck by holding the shift key to enter Safe Boot mode, does the OS do anything in addition to fsck when starting in Safe Boot?

I ask just out of curiosity: if I forget to invoke Safe Boot when the computer restarts, I will restart again and invoke it.

Thanks!

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PostPosted: Tue Feb 11, 2020 10:36 am 
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I think it depends on unknown factors, I'd Safe Boot for good luck... besides Safe Boot clears lots of caches, maybe some involved in the KP.


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PostPosted: Tue Feb 11, 2020 11:07 am 
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Great! I was hoping to learn what else Safe Boot does. Good to know it clears some caches.

And, is the fsck routine that runs during a Safe Boot the same as when invoked using the Disk Utility app? Do they both do the same things?

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PostPosted: Tue Feb 11, 2020 1:13 pm 
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They both do the same thing except DU will report errors where fsck in Safe Mode doesn't, & fsck in Safe Mode can repair things that DU might not, because less/fewer things going on in Safe Boot


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PostPosted: Tue Feb 11, 2020 1:17 pm 
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Excellent! Thanks, BD!

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PostPosted: Tue Feb 11, 2020 1:57 pm 
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You're welcome, always glad to see your smiling face! :)


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PostPosted: Wed Feb 12, 2020 11:01 am 
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Depending on the version of OS X you're running and whether you have a journaled filesystem, it probably won't fsck automatically. Instead, it should replay the journal, which is usually fine.

Whether or not that's really good enough probably depends on why your system KP'd and which filesystem you're running. Based on my experience with journaled filesystems on OS X over many years, the likelihood of having filesystem data corruption without hardware problems (or seriously fubar software that's separately corrupting the filesystem -- of which none comes immediately to mind) is small, i.e. rerunning the journal is probably Good Enough.

But that's just about the filesystem. There might be other things you want to clear up, but I usually tell people not to worry too much about kernel panics if they happen extremely infrequently, like less than once every several months or don't occur randomly. If they always occur doing the same thing, like running that fun little utility that does xyz, the problem might be in the utility or the bit of OS X it's harnessing (I'm pretty sure some parts of OS X are mangier and less tested than others). Random KPs are more troubling because they might represent a deeper problem.

Kernel panics really shouldn't happen very often. I recently rebooted my Mac Pro after 289 days uptime because I needed to turn the power off to replace a breaker and I wasn't confident the UPS would keep it up long enough to finish the task. I think my MacBook Pro has panicked twice since I bought it in 2017.

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PostPosted: Wed Feb 12, 2020 11:24 am 
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Was hoping for some expert input here, thanks Anon.:)


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PostPosted: Wed Feb 12, 2020 12:07 pm 
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Thanks, Anon.

I'm running Sierra (10.12.6) and my file system is journalled. These kernel panics don't happen often, but they seem to happen only when I am watching a video (in Firefox) and I attempt to jump further ahead in the video than the point at which the data seems to have loaded. But it doesn't happen every time I do that; only sometimes.

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PostPosted: Wed Feb 12, 2020 12:26 pm 
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Mike, try it in this Browser which still runs in 10.11 & up...

https://brave.com/


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PostPosted: Tue Feb 25, 2020 8:21 am 
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Just downloaded the Brave browser. Will try it. Thanks, BD!

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PostPosted: Tue Feb 25, 2020 6:56 pm 
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You can also try disabling hardware acceleration in Firefox... this will really vary depending on what version of firefox you're running but general, performance, disable use recommended performance settings, disable use hardware acceleration when available.


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