Hi,

Sometimes I = received the below error message when reboot the ast2500(With the latest = kernel version). Does anyone have the similar issue? How to narrow down = such problem?

[ = 472.770000] Unable to handle kernel NULL pointer dereference at virtual = address 00000000

[ 472.770000] = pgd =3D 80004000

[ 472.770000] = [00000000] *pgd=3D00000000

[ = 472.770000] Internal error: Oops: 80000007 [#1] ARM

[ 472.770000] CPU: 0 PID: 946 Comm: klogd Not = tainted 4.10.17-7422acad49264653b7895c252806a8074e1029c7 = #2

[ 472.770000] Hardware name: = ASpeed SoC

[ 472.770000] task: = 9d1cb000 task.stack: 9d40a000

[ = 472.770000] PC is at 0x0

[ = 472.770000] LR is at __wake_up_common+0x60/0x9c

[ 472.770000] pc : = [<00000000>] lr : = [<80040e0c>] psr: 20000093

[ 472.770000] sp : 9d40bd00 ip : = 9d0bfff4 fp : 9d40bd34

[ = 472.770000] r10: 00000001 r9 : 00000000 r8 : = 00000000

[ 472.770000] r7 : = 9d4ab8e0 r6 : 00000000 r5 : 00000000 r4 : = fffffff4

[ 472.770000] r3 : = 00000000 r2 : 00000000 r1 : 00000001 r0 : = 9d0bfff4

[ 472.770000] Flags: = nzCv IRQs off FIQs on Mode SVC_32 ISA ARM = Segment user

[ 472.770000] = Control: 00c5387d Table: 9cb28008 DAC: = 00000055

[ 472.770000] Process = klogd (pid: 946, stack limit =3D 0x9d40a188)

[ 472.770000] Stack: (0x9d40bd00 to = 0x9d40c000)

[ 472.770000] bd00: = 800e01d8 00000000 9d40bd2c 20000013 9d1a8900 00000001 9d1a8990 = 9d40bd68

[ 472.770000] bd20: = 9d1a8990 00000008 9d40bd54 9d40bd38 800410b8 80040db8 00000000 = 9d40bd48

[ 472.770000] bd40: = 800410b8 9d1a86c0 9d40bd64 9d40bd58 80337934 80041094 9d40bd94 = 9d40bd68

[ 472.770000] bd60: = 803d0394 80337904 00000000 00000000 9e37a2e0 9e37a300 9e3ab048 = 9e41e570

[ 472.770000] bd80: = 00000000 9e37a300 9d40bdac 9d40bd98 803d0438 803d01d0 9e37a2e0 = 9e37a300

[ 472.770000] bda0: = 9d40bdc4 9d40bdb0 80335388 803d0418 9c9facc0 9e37a300 9d40bdd4 = 9d40bdc8

[ 472.770000] bdc0: = 80335418 80335368 9d40be14 9d40bdd8 800e810c 80335408 00000000 = 00000000

[ 472.770000] bde0: = 9e4bb980 9c9facc8 9d12d040 9d1cb2e0 9d1cb000 00000000 80659e80 = 9c9faa40

[ 472.770000] be00: = 9d12d074 00010600 9d40be24 9d40be18 800e82a4 800e8084 9d40be4c = 9d40be28

[ 472.770000] be20: = 80031f2c 800e8298 9d1cb000 00000000 ffffe000 9d12d040 00000000 = 9d12d074

[ 472.770000] be40: = 9d40be6c 9d40be50 8001b398 80031ebc 0000000f 00000000 9d40beac = 0000000f

[ 472.770000] be60: = 9d40be84 9d40be70 8001ba9c 8001b124 00000000 4b24ca30 9d40bec4 = 9d40be88

[ 472.770000] be80: = 800254f0 8001ba5c 9d40bec8 9d1f4ac0 9ca2f540 9d40a000 9d40a000 = 9d40bfb0

[ 472.770000] bea0: = 4b24ca30 9d40bec8 00000000 4b24ca34 9d40a000 00000000 9d40bf8c = 9d40bec8

[ 472.770000] bec0: = 8000ccf0 800252e8 9d40bef4 9d40bed8 80024954 80024870 9d40a000 = 0000000f

[ 472.770000] bee0: = 00000000 fffffffa 000003b2 00000000 00000000 00000000 00000000 = 00000000

[ 472.770000] bf00: = 00000000 00000000 00000000 00000000 00000000 00000000 00000000 = 00000000

[ 472.770000] bf20: = 00000000 00000000 00000000 00000000 00000000 00000000 00000000 = 00000000

[ 472.770000] bf40: = 00000000 00000000 00000000 00000000 00000000 00000000 00000000 = 80025a30

[ 472.770000] bf60: = 00000000 9d40a000 8000a6e4 9d40bfb0 000000af 8000a6e4 9d40a000 = 00000000

[ 472.770000] bf80: = 9d40bfac 9d40bf90 8000d1d4 8000cc28 00000000 7ed07b90 000aed68 = 000000af

[ 472.770000] bfa0: = 00000000 9d40bfb0 8000a58c 8000d134 00000000 7ed07b90 00000000 = 00000008

[ 472.770000] bfc0: = 00000000 7ed07b90 000aed68 000000af 0000000a 00000000 000b0d70 = 0000000f

[ 472.770000] bfe0: = 00000020 7ed07b90 ffffffff 4b24ca34 00000010 00000002 00000000 = 00000000

[ 472.770000] = [<80040e0c>] (__wake_up_common) from [<800410b8>] = (__wake_up+0x30/0x3c)

[ = 472.770000] [<800410b8>] (__wake_up) from [<80337934>] = (sock_def_wakeup+0x3c/0x40)

[ = 472.770000] [<80337934>] (sock_def_wakeup) from [<803d0394>] = (unix_release_sock+0x1d0/0x248) // = 0x803378f8+0x1d0=3D0x80337AC8

[ = 472.770000] [<803d0394>] (unix_release_sock) from = [<803d0438>] (unix_release+0x2c/0x3c)

[ 472.770000] [<803d0438>] (unix_release) = from [<80335388>] (sock_release+0x2c/0xa0)

[ 472.770000] [<80335388>] (sock_release) = from [<80335418>] (sock_close+0x1c/0x24)

[ 472.770000] [<80335418>] (sock_close) = from [<800e810c>] (__fput+0x94/0x1c4)

[ 472.770000] [<800e810c>] (__fput) from = [<800e82a4>] (____fput+0x18/0x1c)

[ 472.770000] [<800e82a4>] (____fput) from = [<80031f2c>] (task_work_run+0x7c/0xa0)

[ 472.770000] [<80031f2c>] (task_work_run) = from [<8001b398>] (do_exit+0x280/0x8e8)

[ 472.770000] [<8001b398>] (do_exit) from = [<8001ba9c>] (do_group_exit+0x4c/0xb4)

[ 472.770000] [<8001ba9c>] (do_group_exit) = from [<800254f0>] (get_signal+0x214/0x580)

[ 472.770000] [<800254f0>] (get_signal) = from [<8000ccf0>] (do_signal+0xd4/0x3dc)

[ 472.770000] [<8000ccf0>] (do_signal) = from [<8000d1d4>] (do_work_pending+0xac/0xbc)

[ 472.770000] [<8000d1d4>] = (do_work_pending) from [<8000a58c>] = (slow_work_pending+0xc/0x20)

[ = 472.770000] Code: bad PC value

Thanks,

Yong