Re: User mode address error problems on 7763

Paul Mundt
2009-09-15T13:39:03Z

On Tue, Sep 15, 2009 at 08:29:21AM -0500, Dale Larson wrote:
> >> > page size. That will bring up a menu where you can cycle through the
> >> > available page sizes. I don't recommend 1MB for a system page size, as it
> >> > tends to interact badly with some of the slab allocators. 64k will give
> >> > you an idea of whether there are indeed any aliasing bugs lurking about.
>
> When I turned on 64K pages I got the following panic:
>
> [ 18.596000] Freeing unused kernel memory: 192k freed
> /sbin/init:572: can't map '/lib/libm.so.0'
> /sbin/init:572: can't map '/lib/libm.so.0'
> /sbin/init: can't load library 'libm.so.0'
> [ 18.828000] Kernel panic - not syncing: Attempted to kill init!
> [ 18.832000] Stack: (0x8c12ff1c to 0x8c130000)
> [ 18.836000] ff00:
> 8817176a
> [ 18.852000] ff20: 8c12ff2c 8c113400 881b5570 881717c0 8c12ff34
> 8c12ff58 88033390 8c12ff64
> [ 18.868000] ff40: 29563718 29574008 8c113400 00001000 8c113400
> 000000bc 8c1133f8 fffffefd
> [ 18.888000] ff60: 8c12ff3c 8804319a 00000001 7be6fb84 29574008
> 8c12ff74 8c12ff74 880338d0
> [ 18.904000] ff80: 8c12ff9c 29563718 29574008 00000000 00000071
> 00000100 880338c0 88025226
> [ 18.920000] ffa0: 7be6fbb4 00000001 ffffff82 2959001a 00000001
> 00000010 00010000 00000002
> [ 18.936000] ffc0: 29590019 00000000 00402109 29580028 0048149c
> 29574008 29563718 7be6fbb4
> [ 18.956000] ffe0: 7be6fbb4 29562c66 29562c5e 00008100 00000000
> 00000004 00000001 00000044
> [ 18.972000]
> [ 18.972000] Call trace:
> [ 18.976000] [<8817176a>] dump_stack+0xe/0x1c
> [ 18.980000] [<881717c0>] panic+0x48/0x104
> [ 18.984000] [<88033390>] do_exit+0x40/0x4bc
> [ 18.988000] [<8804319a>] up_write+0xa/0x18
> [ 18.992000] [<880338d0>] sys_exit+0x10/0x18
> [ 18.996000] [<880338c0>] sys_exit+0x0/0x18
> [ 19.000000] [<88025226>] syscall_call+0xc/0x10
> [ 19.004000]
>
Great, your libc doesn't handle variable page sizes. You're either going
to have to update and rebuild your libc, or go back to the write-through
caching on 4k pages thing. The latter should be fine in the current tree,
as I've tested it on a number of boards. If you run in to issues with
that, please post a full boot log for that also.