Re: 2.6.19-rc2-mm1

Andrew Morton
2006-10-18T19:06:09Z

On Wed, 18 Oct 2006 20:05:48 +1000
Michael Ellerman <michael@ellerman.id.au> wrote:

> On Tue, 2006-10-17 at 13:22 -0700, Andrew Morton wrote:
> > On Tue, 17 Oct 2006 12:37:48 -0700
> > Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> >
> > > Andrew Morton wrote:
> > > > -generic-implementatation-of-bug.patch
> > > > -generic-implementatation-of-bug-fix.patch
> > > > +generic-bug-implementation.patch
> > > > generic-bug-for-i386.patch
> > > > generic-bug-for-x86-64.patch
> > > > uml-add-generic-bug-support.patch
> > > > use-generic-bug-for-ppc.patch
> > > > bug-test-1.patch
> > > >
> > > > Updated generic-BUG-handling patches
> > > >
> > > I thought the powerpc patch had been given a clean bill of health? Or
> > > was there still a problem with it?
> >
> > No, last time I tested it the machine still froze after "returning from
> > prom_init". ie: before it had done any WARNs or BUGs. It's rather
> > mysterious.
>
> Works for me:
>
> Diego5:~# uname -a
> Linux Diego5 2.6.19-rc2-mm1-git #9 SMP Wed Oct 18 19:30:38 EST 2006 ppc64 GNU/Linux

Yeah, weird. I'll test it a third time.

> Diego5:~# echo 4 > /proc/sys/vm/drop_caches
> Badness in drop_caches_sysctl_handler at /home/michael/src/auto/git/fs/drop_caches.c:67
> Call Trace:
> [C0000000431F7760] [C00000000000F8E4] .show_stack+0x6c/0x1a0 (unreliable)
> [C0000000431F7800] [C000000000447B8C] .program_check_exception+0x19c/0x5cc
> [C0000000431F78A0] [C00000000000446C] program_check_common+0xec/0x100
> --- Exception: 700 at .drop_caches_sysctl_handler+0x5c/0x88
> LR = .drop_caches_sysctl_handler+0x20/0x88
> [C0000000431F7C20] [C00000000005725C] .do_rw_proc+0x168/0x230
> [C0000000431F7CF0] [C0000000000BC76C] .vfs_write+0xd0/0x1b4
> [C0000000431F7D90] [C0000000000BD134] .sys_write+0x4c/0x8c
> [C0000000431F7E30] [C00000000000861C] syscall_exit+0x0/0x40
> Diego5:~# echo 8 > /proc/sys/vm/drop_caches
> kernel BUG in drop_caches_sysctl_handler at /home/michael/src/auto/git/fs/drop_caches.c:69!
> cpu 0xd: Vector: 700 (Program Check) at [c0000000431f7910]
> pc: c0000000000e3a5c: .drop_caches_sysctl_handler+0x68/0x88
> lr: c0000000000e3a14: .drop_caches_sysctl_handler+0x20/0x88
> sp: c0000000431f7b90
> msr: 8000000000029032
> current = 0xc00000000fc8c810
> paca = 0xc000000000564e00
> pid = 1465, comm = bash
> kernel BUG in drop_caches_sysctl_handler at /home/michael/src/auto/git/fs/drop_caches.c:69!
> enter ? for help
> [c0000000431f7c20] c00000000005725c .do_rw_proc+0x168/0x230
> [c0000000431f7cf0] c0000000000bc76c .vfs_write+0xd0/0x1b4
> [c0000000431f7d90] c0000000000bd134 .sys_write+0x4c/0x8c
> [c0000000431f7e30] c00000000000861c syscall_exit+0x0/0x40
> --- Exception: c01 (System Call) at 000000000fec9aac
> SP (ff8416f0) is in userspace
> d:mon>
>
> There's some NUMA badness going around that you might be hitting.

I don't set CONFIG_NUMA on the g5.