Date: Sat, 3 Apr 2010 16:35:23 +0200 From: Gary Jennejohn <gary.jennejohn@freenet.de> To: Masoom Shaikh <masoom.shaikh@gmail.com> Cc: freebsd-hackers@freebsd.org, freebsd-stable@freebsd.org Subject: Re: random FreeBSD panics Message-ID: <20100403163523.7d5658f2@ernst.jennejohn.org> In-Reply-To: <q2ib10011eb1004030551yf6b94e76x7524930a47a60edd@mail.gmail.com> References: <b10011eb1003280128k4034e667v1377205888e7a2d@mail.gmail.com> <honb8m$ncu$1@dough.gmane.org> <b10011eb1003280418l2038c651saf0d09fc48ab3966@mail.gmail.com> <9bbcef731003280503q4993e5b4ud8d874b8e9c376a9@mail.gmail.com> <b10011eb1003280742i3d45b14bu6492328ce5bc745a@mail.gmail.com> <9bbcef731003281038x33b8a9atc2a81d22aa26468@mail.gmail.com> <q2ib10011eb1004030551yf6b94e76x7524930a47a60edd@mail.gmail.com>
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On Sat, 3 Apr 2010 12:51:46 +0000 Masoom Shaikh <masoom.shaikh@gmail.com> wrote: > On Sun, Mar 28, 2010 at 5:38 PM, Ivan Voras <ivoras@freebsd.org> wrote: > > On 28 March 2010 16:42, Masoom Shaikh <masoom.shaikh@gmail.com> wrote: > > > >> lets assume if this is h/w problem, then how can other OSes overcome > >> this ? is there a way to make FreeBSD ignore this as well, let it > >> result in reasonable performance penalty. > > > > Very probably, if only we could detect where the problem is. > > Try adding "options __ __ PRINTF_BUFR_SIZE=128" to the kernel > > configuration file if you can, to see if you can get a less mangled > > log outout. > > > > ok, after few days of silence I am back with more questions > this time system feels little better, it is able to sustain for more > time that what 7.3-RELEASE could > > FreeBSD raptor 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #0: Thu Apr 1 > 01:20:45 UTC 2010 root@:/usr/obj/usr/src/sys/INSPIRON amd64 > > I am using KDE4, and when OS freezes, well it freezes, means I cannot > change to tty0 and see the panic text, if any it might possibly have > spit. the stuck frozen GUI keeps staring there. So the question is how > to I capture that panic text ? unfortunately I am not getting core > files too, so there is nothing I can pick up hints > > is there some option (KDB, DDB), so that on panic system drop to debugger ? > [trimmed Cc - no need to send this to 3 MLs] There's no code in the kernel to switch back out of graphics mode (i.e. what X uses) when a panic happens. You probably can switch to v0, but you won't be able to see it. The only sure-fire way is to hook up a screen (terminal, laptop or another computer) to a serial port. -- Gary Jennejohn
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