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    SubjectRe: 2.6.19-rc2-mm1
    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.
    -
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