Re: User mode address error problems on 7763

[Dale Larson <dlarson42@gmail.com>]

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>> > 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:

[    0.000000] Linux version 2.6.31-rc9 (dlarson@UbuntuDale) (gcc
version 4.3.4 (GCC) ) #7 Tue Sep 15 08:05:36 CDT 2009
[    0.000000] Boot params:
[    0.000000] ... MOUNT_ROOT_RDONLY - 00000001
[    0.000000] ... RAMDISK_FLAGS     - 00000000
[    0.000000] ... ORIG_ROOT_DEV     - 00000200
[    0.000000] ... LOADER_TYPE       - 00000001
[    0.000000] ... INITRD_START      - 00000000
[    0.000000] ... INITRD_SIZE       - 00000000
[    0.000000] Early serial console at MMIO 0x18000008 (options '115200n8')
[    0.000000] console [uart0] enabled
[    0.000000] Booting machvec: jci7763
[    0.000000] Node 0: start_pfn = 0x800, low = 0x1000
[    0.000000] Zone PFN ranges:
[    0.000000]   Normal   0x00000800 -> 0x00001000
[    0.000000] Movable zone start PFN for each node
[    0.000000] early_node_map[1] active PFN ranges
[    0.000000]     0: 0x00000800 -> 0x00001000
[    0.000000] Built 1 zonelists in Zone order, mobility grouping off.
 Total pages: 2047
[    0.000000] Kernel command line:
earlycon=uart,mmio,0x18000008,115200n8 console=ttyS0,115200n8
root=/dev/nfs rw rootfstype=nfs nfsroot\x159.222.11.56:/n40root ip=dhcp
[    0.000000] PID hash table entries: 512 (order: 9, 2048 bytes)
[    0.000000] Dentry cache hash table entries: 16384 (order: 0, 65536 bytes)
[    0.000000] Inode-cache hash table entries: 16384 (order: 0, 65536 bytes)
[    0.000000] PVR\x10200a00 CVRs440010 PRR\0000a10
[    0.000000] I-cache : n_ways=4 n_sets%6 way_incr92
[    0.000000] I-cache : entry_mask=0x00001fe0 alias_mask=0x00000000 n_aliases=0
[    0.000000] D-cache : n_ways=4 n_sets%6 way_incr92
[    0.000000] D-cache : entry_mask=0x00001fe0 alias_mask=0x00000000 n_aliases=0
[    0.000000] Memory: 128064k/131072k available (1424k kernel code,
623k data, 192k init)
[    0.000000] NR_IRQS:256
[    0.000000] sh_tmu: TMU0 used for clock events
[    0.000000] sh_tmu: TMU0 used for periodic clock events
[    0.000000] sh_tmu: TMU1 used as clock source
[    0.004000] Calibrating delay loop (skipped)... 266.66 BogoMIPS
PRESET (lpjS3333)
[    0.008000] Mount-cache hash table entries: 8192
[    0.016000] CPU: SH7763
[    0.032000] NET: Registered protocol family 16
[    0.072000] bio: create slab <bio-0> at 0
[    0.080000] SCSI subsystem initialized
[    0.100000] NET: Registered protocol family 2
[    0.104000] IP route cache hash table entries: 16384 (order: 0, 65536 bytes)
[    0.108000] TCP established hash table entries: 8192 (order: 0, 65536 bytes)
[    0.112000] TCP bind hash table entries: 8192 (order: -1, 32768 bytes)
[    0.116000] TCP: Hash tables configured (established 8192 bind 8192)
[    0.120000] TCP reno registered
[    0.124000] NET: Registered protocol family 1
[    0.140000] msgmni has been set to 248
[    0.144000] io scheduler noop registered
[    0.148000] io scheduler anticipatory registered (default)
[    0.156000] io scheduler deadline registered
[    0.160000] io scheduler cfq registered
[    0.200000] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
[    0.204000] serial8250.0: ttyS0 at MMIO 0x18000008 (irq = 4) is a 16550A
[    0.208000] console handover: boot [uart0] -> real [ttyS0]
[    0.232000] loop: module loaded
[    0.276000] sh_mii: probed
[    0.280000] Base address at 0xfee00800, 00:10:8D:01:C1:9A, IRQ 57.
[    0.292000] sh_tmu: TMU0 kept as earlytimer
[    0.296000] sh_tmu: TMU1 kept as earlytimer
[    0.300000] TCP cubic registered
[    0.304000] NET: Registered protocol family 17
[    0.308000] RPC: Registered udp transport module.
[    0.312000] RPC: Registered tcp transport module.
[    0.832000] net eth0: attached phy 1 to driver Generic PHY
[    1.844000] Sending DHCP requests ..
[    4.832000] PHY: 0:01 - Link is Up - 100/Full
[    9.668000] .., OK
[   18.396000] IP-Config: Got DHCP answer from 0.0.0.0, my address is
159.222.10.212
[   18.408000] IP-Config: Complete:
[   18.412000]      device=eth0, addr\x159.222.10.212,
mask%5.255.252.0, gw\x159.222.8.2,
[   18.424000]      host\x159.222.10.212, domain=cg.na.jci.com,
nis-domain=(none),
[   18.428000]      bootserver=0.0.0.0, rootserver\x159.222.11.56, rootpath[   18.440000] Looking up port of RPC 100003/2 on 159.222.11.56
[   18.448000] Looking up port of RPC 100005/1 on 159.222.11.56
[   18.588000] VFS: Mounted root (nfs filesystem) on device 0:9.
[   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]

Dale Larson
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