NULL pointer dereference with 2.6.31 on OMAP243

[Chris Banker]

I'm having trouble with the 2.6.31 kernel running on an OMAP2430
board.  I was able to get the board to boot using 2.6.31rc1, but am
having some issue with 2.6.31.

With low-level debugging enabled, I get the output below.  It appears
to be an issue with the new hwmod system, which didn't exist in
2.6.31rc1.  It seems to die during the initialization of mpu_hwmod.

Anyone have any suggestions as to how to fix this or what to try?

Thanks,
Chris

------------------------------------------------------------------------------------------------------------------------------------------------------

Starting kernel ...

Uncompressing Linux.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
done, booting the kernel.
<5>Linux version 2.6.31-omap1 (cbanker@vcaeng05) (gcc version 4.3.3
(GCC) ) #27 Wed Nov 18 17:23:18 PST 2009
CPU: ARMv6-compatible processor [4107b366] revision 6 (ARMv6TEJ), cr=00c5387f
CPU: VIPT aliasing data cache, VIPT aliasing instruction cache
Machine: BFT Digital Modem
Memory policy: ECC disabled, Data cache writeback
<7>On node 0 totalpages: 32768
<7>free_area_init_node: node 0, pgdat c0f10848, node_mem_map c0f35000
<7>  Normal zone: 256 pages used for memmap
<7>  Normal zone: 0 pages reserved
<7>  Normal zone: 32512 pages, LIFO batch:7
<6>OMAP2430<6>
<6>SRAM: Mapped pa 0x40200000 to va 0xe3000000 size: 0x100000
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 32512
<5>Kernel command line: root=/dev/ram0 rw console=ttys2,115200n8
PID hash table entries: 512 (order: 9, 2048 bytes)
<6>Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
<6>Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
<6>Memory: 128MB = 128MB total
<5>Memory: 114232KB available (3084K code, 327K data, 12124K init, 0K highmem)
<6>NR_IRQS:384
<6>Clocking rate (Crystal/DPLL/MPU): 19.2/660/330 MHz
<1>Unable to handle kernel NULL pointer dereference at virtual address 00000004
<1>pgd = c0004000
<1>[00000004] *pgd=00000000
Internal error: Oops: 5 [#1]
<d>Modules linked in:
CPU: 0    Not tainted  (2.6.31-omap1 #27)
PC is at _enable+0x78/0x208
LR is at release_console_sem+0x1a8/0x204
pc : [<c0be9098>]    lr : [<c0bff998>]    psr: a00001d3
sp : c0ee3f38  ip : c0ee3e80  fp : c0ee3f4c
r10: 80022140  r9 : 4107b366  r8 : 80022174
r7 : c0ee86b4  r6 : c0be95cc  r5 : c0ee6154  r4 : c0ee6154
r3 : 00000000  r2 : 00000000  r1 : 000005b2  r0 : 0000001f
Flags: NzCv  IRQs off  FIQs off  Mode SVC_32  ISA ARM  Segment kernel
Control: 00c5387f  Table: 80004000  DAC: 00000017
Process swapper (pid: 0, stack limit = 0xc0ee2260)
Stack: (0xc0ee3f38 to 0xc0ee4000)
3f20:                                                       c0ee6634 c0ee6154
3f40: c0ee3f68 c0ee3f50 c0be9648 c0be902c 00000000 c0ee6154 c0be95cc c0ee3f88
3f60: c0ee3f6c c0be8a6c c0be95d8 c0eece48 c0eece48 c0bdbe08 c0ee5b34 c0ee3f98
3f80: c0ee3f8c c0be98f4 c0be8a44 c0ee3fb0 c0ee3f9c c000dfc4 c0be98a0 c0f11190
3fa0: c0f11184 c0ee3fc0 c0ee3fb4 c000ef0c c000df50 c0ee3fd0 c0ee3fc4 c000b878
3fc0: c000eee8 c0ee3ff4 c0ee3fd4 c0008a2c c000b84c c0008658 c0bdbe08 00c5387d
3fe0: c0f11440 c0bdc20c 00000000 c0ee3ff8 80008034 c00088fc 00000000 00000000
Backtrace:
[<c0be9020>] (_enable+0x0/0x208) from [<c0be9648>] (_setup+0x7c/0xb0)
 r4:c0ee6154
[<c0be95cc>] (_setup+0x0/0xb0) from [<c0be8a6c>] (omap_hwmod_for_each+0x34/0x78)
 r6:c0be95cc r5:c0ee6154 r4:00000000
[<c0be8a38>] (omap_hwmod_for_each+0x0/0x78) from [<c0be98f4>]
(omap_hwmod_late_init+0x60/0x8c)
 r7:c0ee5b34 r6:c0bdbe08 r5:c0eece48 r4:c0eece48
[<c0be9894>] (omap_hwmod_late_init+0x0/0x8c) from [<c000dfc4>]
(omap2_init_common_hw+0x80/0xbc)
[<c000df44>] (omap2_init_common_hw+0x0/0xbc) from [<c000ef0c>]
(omap2430bft_init_irq+0x30/0x1c4)
 r5:c0f11184 r4:c0f11190
[<c000eedc>] (omap2430bft_init_irq+0x0/0x1c4) from [<c000b878>]
(init_IRQ+0x38/0x44)
[<c000b840>] (init_IRQ+0x0/0x44) from [<c0008a2c>] (start_kernel+0x13c/0x2ac)
[<c00088f0>] (start_kernel+0x0/0x2ac) from [<80008034>] (0x80008034)
 r6:c0bdc20c r5:c0f11440 r4:00c5387d
Code: 0a000005 e5933020 e592205c e593305c (e5920004)
<4>---[ end trace 1b75b31a2719ed1c ]---
<0>Kernel panic - not syncing: Attempted to kill the idle task!
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