On 12/01/2011 00:03, Garrett Cooper wrote:
On Tue, Jan 11, 2011 at 12:11 PM, David DEMELIER
<demelier.da...@gmail.com> wrote:
Hello,
I'm just guessing why current BSD panic() when a problem occurs, all
modern operating systems solve the problem instead of crashing
suddently and corrupting all your data without saving your work.
Yes, why this function exists? There is no way to solve a problem
without panic'ing? Is panic really needed? Imagine someone working on
something really important and his computer just panic, his work not
saved everybody shout at him in the corporation. He lose his job, his
wife, his dog, everything is wrong, just because of a panic() !
Seriously, I really hate when I play some music that suddenly the
music get stucked in a infinite loop, why ? I don't know because the
panic does not core dump. But after some search I found that the panic
was done because of conky. How the hell conky can panic FreeBSD? We
are in 2011 ! I think even Window 2000 does not crash on a user-land
software.
I'm guessing now, if minix panic when a bloated crappy software is
running. I think Andrew is in the right way.
So I guess with that reasoning we don't need asserts, bugs never
occur, and the if the computer catches on fire we should just let it
burn up instead of getting an extinguisher and put it out :D?
As an example: I would rather have my PC panic and not write out
corrupt data to disk instead of write out that corrupt data to disk.
The latter has happened with userland apps on occasion before they
crash, and that really fries my bacon... Similarly, if we're beyond
recovery, panicing is the best and only option, but yes... recovery
could be handled better in some cases. Filesystems are a bit trickier
though because they're more mission critical than say a non-critical
device driver (my sound driver?) tanking.
Thanks,
-Garrett
In any case, when panic occurs, switching display to the tty can be
great. Why not a sysctl like kern.tty_on_panic? Because when you're
running X and a panic occurs not everybody understand what happens.
Or the problem for me, when a panic occurs it *NEVER* core dump.
Absolutely never, it stops at a moment but does not finish so I need to
be in tty to debug directly so that's why a tty switch may helps in my
case :-)
--
David Demelier
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