Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = a8aa0000
[00000000] *pgd=a809c835, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 3178 Comm: bash Not tainted 4.9.133-at16 #2
Hardware name: Freescale i.MX7 Dual (Device Tree)
task: a9ad85c0 task.stack: a8a70000
PC is at page_address+0x4/0xec
LR is at imx_dma_tx+0x150/0x2f8
pc : [<801edfd0>]    lr : [<804d45bc>]    psr: 200b0193
sp : a8a71d10  ip : 00000000  fp : a8882548
r10: a88b021c  r9 : 81511024  r8 : a826ba10
r7 : 00000001  r6 : a8882548  r5 : 00000001  r4 : a8882410
r3 : 81511024  r2 : ab659000  r1 : 00000024  r0 : 00000000
Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 10c53c7d  Table: a8aa006a  DAC: 00000051
Process bash (pid: 3178, stack limit = 0xa8a70218)
Stack: (0xa8a71d10 to 0xa8a72000)
1d00:                                     a8882410 00000001 a8882548 00000001
1d20: a826ba10 81511024 a88b021c 804d45bc a8212d98 a00b0093 a8882410 a8882670
1d40: a8882410 200b0193 0000074d ab62c50c ab62c500 00000000 804d4764 804d47e8
1d60: ab62c4c0 a8882670 3e5c2005 0000074d ab62c50c 80189840 0b8fd0fe 00000007
1d80: 3e5c2005 0000074d 815a41e7 80fb25e8 00000000 ab62c4c0 00000003 7fffffff
1da0: ffffffff ab62c578 ab62c4d4 ab62c558 ab62c538 80189a9c ab62c578 00000000
1dc0: 00000000 80198d3c 3e5c2005 0000074d 3e5c2005 0000074d ab62c4c0 a8007100
1de0: 815050cc 00000011 a8034c00 00000001 a8a71e68 a8008000 a92949c0 8085cf8c
1e00: a8007100 8017b864 814cecdc 00000000 00000011 00000000 00000001 80176ce0
1e20: 814cecdc 801771f4 81528000 815050cc c080200c a8a71e68 c0802000 c0803000
1e40: 00000007 801014e4 804b5948 600b0013 ffffffff a8a71e9c 00000007 a8a70000
1e60: 00000007 8010be4c 00000007 00000000 00000000 a8ff4000 a9182c00 00000000
1e80: 00000007 012cba0f 00000007 a8a70000 00000007 a92949c0 00000100 a8a71eb8
1ea0: 804b9e0c 804b5948 600b0013 ffffffff 00000051 7f000000 a8ff4000 a92949c0
1ec0: 804b9bb4 a85e6640 00000001 a92949c0 804b5820 012cba08 a8a71f80 00000000
1ee0: 00000007 00000000 00000000 80218180 0000080f 80114d8c 012cba08 a8a71fb0
1f00: 00000000 00000000 00000000 80101300 a9ad85c0 a8a70000 000de020 80bae928
1f20: a8ac1500 0000000a a8a58b40 00000001 00000001 80236184 0000000a a92949c0
1f40: 00000007 012cba08 a8a71f80 00000000 00000007 80218f80 0000000a 80236488
1f60: a8a58b40 a92949c0 a92949c0 00000000 00000000 012cba08 00000007 80219d0c
1f80: 00000000 00000000 00000000 00000007 012cba08 76ee1d60 00000004 80107884
1fa0: a8a70000 801076c0 00000007 012cba08 00000001 012cba08 00000007 00000000
1fc0: 00000007 012cba08 76ee1d60 00000004 012cba08 00000007 00000000 00000000
1fe0: 00000000 7ef4ae8c 76e441bb 76e80cf6 000b0030 00000001 00000000 00000000
[<801edfd0>] (page_address) from [<804d45bc>] (imx_dma_tx+0x150/0x2f8)
[<804d45bc>] (imx_dma_tx) from [<804d47e8>] (imx_rs485_before_send+0x84/0xfc)
[<804d47e8>] (imx_rs485_before_send) from [<80189840>] (__hrtimer_run_queues+0x118/0x1ac)
[<80189840>] (__hrtimer_run_queues) from [<80189a9c>] (hrtimer_interrupt+0xa8/0x1fc)
[<80189a9c>] (hrtimer_interrupt) from [<8085cf8c>] (arch_timer_handler_phys+0x28/0x30)
[<8085cf8c>] (arch_timer_handler_phys) from [<8017b864>] (handle_percpu_devid_irq+0x8c/0x144)
[<8017b864>] (handle_percpu_devid_irq) from [<80176ce0>] (generic_handle_irq+0x24/0x34)
[<80176ce0>] (generic_handle_irq) from [<801771f4>] (__handle_domain_irq+0x7c/0xec)
[<801771f4>] (__handle_domain_irq) from [<801014e4>] (gic_handle_irq+0x48/0x8c)
[<801014e4>] (gic_handle_irq) from [<8010be4c>] (__irq_svc+0x6c/0xa8)
Exception stack(0xa8a71e68 to 0xa8a71eb0)
1e60:                   00000007 00000000 00000000 a8ff4000 a9182c00 00000000
1e80: 00000007 012cba0f 00000007 a8a70000 00000007 a92949c0 00000100 a8a71eb8
1ea0: 804b9e0c 804b5948 600b0013 ffffffff
[<8010be4c>] (__irq_svc) from [<804b5948>] (tty_write+0x128/0x2d4)
[<804b5948>] (tty_write) from [<80218180>] (__vfs_write+0x1c/0x114)
[<80218180>] (__vfs_write) from [<80218f80>] (vfs_write+0xa4/0x168)
[<80218f80>] (vfs_write) from [<80219d0c>] (SyS_write+0x3c/0x90)
[<80219d0c>] (SyS_write) from [<801076c0>] (ret_fast_syscall+0x0/0x48)
Code: e060062c e0203091 e12fff1e e92d47f0 (e5903000)
---[ end trace eb41f3122353022f ]---
Kernel panic - not syncing: Fatal exception in interrupt
SMP: failed to stop secondary CPUs
---[ end Kernel panic - not syncing: Fatal exception in interrupt