[247835.563303] Unable to handle kernel NULL pointer dereference at virtual address 00000004
[247835.575855] pgd = c0004000
[247835.580908] [00000004] *pgd=00000000
[247835.586899] Internal error: Oops: 817 [#1] PREEMPT


Entering kdb (current=0xcb830060, pid 3146) Oops: (null)
due to oops @ 0xc003c5bc

Pid: 3146, comm:          kworker/0:0
CPU: 0    Not tainted  (3.2.27+ #250)
PC is at worker_enter_idle+0x48/0x158
LR is at start_worker+0x28/0x34
pc : [<c003c5bc>]    lr : [<c003c6f4>]    psr: 60000093
sp : cb835f70  ip : 00000001  fp : c04ed6d8
r10: c04ed82c  r9 : 00000001  r8 : c04ed168
r7 : 00000001  r6 : ca72e3a0  r5 : c04ed6d8  r4 : cbaf3620

r3 : cbaf3638  r2 : 00000000  r1 : c04ed168  r0 : ca72e3a0
Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 00c5387d  Table: 0a7e8008  DAC: 00000017

[<c0013e1c>] (unwind_backtrace+0x0/0xf0) from [<c03777b0>] (kdb_dumpregs+0x28/0x50)
[<c03777b0>] (kdb_dumpregs+0x28/0x50) from [<c00716b0>] (kdb_main_loop+0x504/0x758)
[<c00716b0>] (kdb_main_loop+0x504/0x758) from [<c0073c7c>] (kdb_stub+0x13c/0x368)
[<c0073c7c>] (kdb_stub+0x13c/0x368) from [<c006ac80>] (kgdb_handle_exception+0x1fc/0x69c)
[<c006ac80>] (kgdb_handle_exception+0x1fc/0x69c) from [<c001359c>] (kgdb_notify+0x24/0x40)
[<c001359c>] (kgdb_notify+0x24/0x40) from [<c037e380>] (notifier_call_chain+0x44/0x84)
[<c037e380>] (notifier_call_chain+0x44/0x84) from [<c037e3f8>] (__atomic_notifier_call_chain+0x38/0x4c)
[<c037e3f8>] (__atomic_notifier_call_chain+0x38/0x4c) from [<c037e424>] (atomic_notifier_call_chain+0x18/0x20)
[<c037e424>] (atomic_notifier_call_chain+0x18/0x20) from [<c037e464>] (notify_die+0x38/0x44)
more>
Only 'q' or 'Q' are processed at more prompt, input ignored
[<c037e464>] (notify_die+0x38/0x44) from [<c00114d8>] (die+0xb0/0x37c)
[<c00114d8>] (die+0xb0/0x37c) from [<c03770d4>] (__do_kernel_fault.part.3+0x54/0x74)
[<c03770d4>] (__do_kernel_fault.part.3+0x54/0x74) from [<c037e0cc>] (do_page_fault+0x1a4/0x36c)
[<c037e0cc>] (do_page_fault+0x1a4/0x36c) from [<c0008328>] (do_DataAbort+0x34/0x98)
[<c0008328>] (do_DataAbort+0x34/0x98) from [<c037c918>] (__dabt_svc+0x38/0x60)
Exception stack(0xcb835f28 to 0xcb835f70)
5f20:                   ca72e3a0 c04ed168 00000000 cbaf3638 cbaf3620 c04ed6d8
5f40: ca72e3a0 00000001 c04ed168 00000001 c04ed82c c04ed6d8 00000001 cb835f70
5f60: c003c6f4 c003c5bc 60000093 ffffffff
[<c037c918>] (__dabt_svc+0x38/0x60) from [<c003c5bc>] (worker_enter_idle+0x48/0x158)
[<c003c5bc>] (worker_enter_idle+0x48/0x158) from [<c003c6f4>] (start_worker+0x28/0x34)
[<c003c6f4>] (start_worker+0x28/0x34) from [<c003e2d4>] (manage_workers+0x2b0/0x2e0)
[<c003e2d4>] (manage_workers+0x2b0/0x2e0) from [<c003e634>] (worker_thread+0x330/0x354)
[<c003e634>] (worker_thread+0x330/0x354) from [<c0042e3c>] (kthread+0x84/0x8c)
[<c0042e3c>] (kthread+0x84/0x8c) from [<c000e930>] (kernel_thread_exit+0x0/0x8)