Wait Queue bug triggered on EST SBC8260

[Joe Green]

As the patch indicates, we've only really built and tested this for
2.2.14 at this time.  We will be porting the scheduler to 2.4 when we
add support for that release, but I can't tell you if or when it might
be ported to any of the 2.3 versions.  The source code is provided, so
you can try to port it yourself if you wish.

On Wed, 24 May 2000, diekema_jon wrote:
> Previous message:
>
> http://lists.linuxppc.org/listarcs/linuxppc-embedded/200005/msg00180.html
>
> > bad magic 0 (should be c01fb2e0, creator 0), wq bug, forcing oops.
> > kernel BUG at sched.c:656!
> > NIP: C000FB5C XER: 00000000 LR: C000FB5C REGS: c01adc00 TRAP: 0700
> > MSR: 00081032 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 11
> > TASK = c01ac000[1] 'init' Last syscall: 6
> > last math 00000000 last altivec 00000000
> > GPR00: C000FB5C C01ADCB0 C01AC000 0000001B 00001032 C010EF80 C01FB260 C0128502
> > GPR08: 0000001B C0110000 F00000B8 C01ADBF0 24444028 1001EEB4 00000000 00000000
> > GPR16: 00000000 00000000 00000000 00000000 00009032 C01DA060 00000000 00000000
> > GPR24: 00000021 00000001 C01DA060 C010A3E0 C0125000 C0110000 C01FB2D4 C01ADCB0
> > Call backtrace:
> > C000FB5C C008CB8C C007F560 C007FE8C C0033CE4 C0033D80 C0032818
> > C00328CC C00328FC C00048F0 10005548 10005A20 0FF09E78 00000000
> > Kernel panic: Exception in kernel pc c000fb5c signal 4
> > Rebooting in 180 seconds..
>
> We are walking into a scheduling bug in kernel/sched.c with Linux
> 2.3.99-pre9.  MontaVista has an experimental real-time scheduler that
> can be installed into Linux 2.2.14.  Will this scheduler work with
> Linux 2.3.99-pre9?  If it has a shot at working, I would like to try
> it.  Perhaps I can avoid my problem.
>
>
> From hhl-kernel-rtsched.patch:
>
> REAL TIME SCHEDULER for Linux version 2.2.14
>
> Released under the GNU Public License.
>
> This patch contains the real time scheduler developed by
> MontaVista Software, Inc.  It applies cleanly against the
> Linux kernel version 2.2.14.  It adds the kernel configuration
> option CONFIG_RTSCHED.  If CONFIG_RTSCHED=y, the real time
> scheduler is configured, otherwise the standard scheduler is
> used.
>
> This patch also contains some fixes for the standard scheduler.
>
> May 5, 2000:
> Add real time scheduler option, as well as fixes for the standard scheduler.
> This updated version fixes a build problem on the PowerPC.
>
> CONTACT: <source at mvista.com>
--
Joe Green <jgreen at mvista.com>
MontaVista Software, Inc.
(408) 328-9209

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