pi@raspberrypi:~/os_lab/5_1$ insm
[  610.564417] Echo module loaded
pi@raspberrypi:~/os_lab/5_1$ sudo sh -c 'printf "Dinges" > /dev/echo'
[  624.882452] Unable to handle kernel paging request at virtual address da554420
[  624.893395] pgd = da78c000
[  624.899543] [da554420] *pgd=1a40041e(bad)
[  624.906966] Internal error: Oops: 8000000d [#5] ARM
[  624.915166] Modules linked in: 5_1(O) cfg80211 rfkill snd_bcm2835 snd_pcm snd_timer snd bcm2835_gpiomem bcm2835_wdt uio_pdrv_genirq uio ipv6 [last unloaded: 5_3]
[  624.936568] CPU: 0 PID: 1033 Comm: sh Tainted: G      D    O    4.4.38+ #938
[  624.946969] Hardware name: BCM2708
[  624.953581] task: da555f60 ti: da65a000 task.ti: da65a000
[  624.962190] PC is at 0xda554420
[  624.968459] LR is at chrdev_open+0xb4/0x15c
[  624.975684] pc : [<da554420>]    lr : [<c0130f7c>]    psr: a0000013
[  624.975684] sp : da65bdb8  ip : da65bdb8  fp : da65bde4
[  624.993123] r10: dafa0010  r9 : da65bf5c  r8 : da5598c0
[  625.001198] r7 : d89e1b00  r6 : 00000000  r5 : da402f40  r4 : da627d5c
[  625.010578] r3 : da554420  r2 : 00000000  r1 : da5598c0  r0 : d89e1b00
[  625.019866] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[  625.029785] Control: 00c5387d  Table: 1a78c008  DAC: 00000055
[  625.038299] Process sh (pid: 1033, stack limit = 0xda65a188)
[  625.046743] Stack: (0xda65bdb8 to 0xda65c000)
[  625.053908] bda0:                                                       c02a2ecc 00000000
[  625.067458] bdc0: da65bde4 da5598c0 d89e1b00 da5598c8 c0130ec8 da65beb0 da65be0c da65bde8
[  625.081183] bde0: c012ada8 c0130ed4 da5598c0 da65beb0 00020241 da8023b8 da65beb0 da65bf5c
[  625.095037] be00: da65be2c da65be10 c012bf4c c012abdc c0138da0 c0137830 da8023b8 00000000
[  625.108930] be20: da65beac da65be30 c0139344 c012beec 000003f8 00000040 1bff338f dac02600
[  625.123066] be40: c00e8314 0012b000 00000000 da480000 dad08178 00000000 00000000 da5598c0
[  625.137533] be60: 00000022 00000041 00efe004 00000000 00000000 d89e1b00 dafa0010 d78cb110
[  625.152265] be80: da555f60 ffffff9c da65bf5c da65beb0 00000001 c000f9e8 da65a000 00000000
[  625.167339] bea0: da65bf4c da65beb0 c013b858 c0138e58 dafa0010 d78cb110 eaab7e8d 00000004
[  625.182576] bec0: dafd3015 00000000 00000000 da9b2440 d89e1b00 00000301 00000000 00000090
[  625.198012] bee0: 00000000 00000000 00000000 da65bef0 da620e40 da620e54 00000000 00010000
[  625.213761] bf00: da65bf3c da65bf10 c0147b58 c0147408 00020241 ffffff9c 00020241 dafd3000
[  625.229620] bf20: dafd3000 00000000 00000002 ffffff9c ffffff9c 00000003 dafd3000 00000005
[  625.245485] bf40: da65bf94 da65bf50 c012c2b4 c013b7f4 da65a000 00000000 da65bfa4 00020241
[  625.261336] bf60: c00381b6 00000022 00000300 00000001 7f6585fc 7f6564ac 80efe1d8 00000005
[  625.277185] bf80: c000f9e8 da65a000 da65bfa4 da65bf98 c012c3b0 c012c1b4 00000000 da65bfa8
[  625.293046] bfa0: c000f820 c012c390 7f6585fc 7f6564ac 7f6585fc 00020241 000001b6 00000000
[  625.308900] bfc0: 7f6585fc 7f6564ac 80efe1d8 00000005 7f6564a8 00000003 be8827b8 7f6585fc
[  625.324755] bfe0: 7f655dc8 be882780 7f64ea98 b6f173dc 60000010 7f6585fc 00000000 00000000
[  625.340640] [<c0130f7c>] (chrdev_open) from [<c012ada8>] (do_dentry_open+0x1d8/0x2fc)
[  625.356180] [<c012ada8>] (do_dentry_open) from [<c012bf4c>] (vfs_open+0x6c/0x90)
[  625.371270] [<c012bf4c>] (vfs_open) from [<c0139344>] (path_openat+0x4f8/0xf40)
[  625.382552] [<c0139344>] (path_openat) from [<c013b858>] (do_filp_open+0x70/0xd4)
[  625.397665] [<c013b858>] (do_filp_open) from [<c012c2b4>] (do_sys_open+0x10c/0x1dc)
[  625.412951] [<c012c2b4>] (do_sys_open) from [<c012c3b0>] (SyS_open+0x2c/0x30)
[  625.424026] [<c012c3b0>] (SyS_open) from [<c000f820>] (ret_fast_syscall+0x0/0x1c)
[  625.439040] Code: 10401248 00608040 11201020 00000240 (da553680)

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  624.906966] Internal error: Oops: 8000000d [#5] ARM

Message from syslogd@raspberrypi at Mar 14 18:17:59[  625.475323] ---[ end trace 397cdeef7536bdf1 ]---
 ...
 kernel:[  625.038299] Process sh (pid: 1033, stack limit = 0xda65a188)

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.046743] Stack: (0xda65bdb8 to 0xda65c000)

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.053908] bda0:                                                       c02a2ecc 00000000

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.067458] bdc0: da65bde4 da5598c0 d89e1b00 da5598c8 c0130ec8 da65beb0 da65be0c da65bde8

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.081183] bde0: c012ada8 c0130ed4 da5598c0 da65beb0 00020241 da8023b8 da65beb0 da65bf5c

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.095037] be00: da65be2c da65be10 c012bf4c c012abdc c0138da0 c0137830 da8023b8 00000000

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.108930] be20: da65beac da65be30 c0139344 c012beec 000003f8 00000040 1bff338f dac02600

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.123066] be40: c00e8314 0012b000 00000000 da480000 dad08178 00000000 00000000 da5598c0

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.137533] be60: 00000022 00000041 00efe004 00000000 00000000 d89e1b00 dafa0010 d78cb110

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.152265] be80: da555f60 ffffff9c da65bf5c da65beb0 00000001 c000f9e8 da65a000 00000000

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.167339] bea0: da65bf4c da65beb0 c013b858 c0138e58 dafa0010 d78cb110 eaab7e8d 00000004

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.182576] bec0: dafd3015 00000000 00000000 da9b2440 d89e1b00 00000301 00000000 00000090

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.198012] bee0: 00000000 00000000 00000000 da65bef0 da620e40 da620e54 00000000 00010000

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.213761] bf00: da65bf3c da65bf10 c0147b58 c0147408 00020241 ffffff9c 00020241 dafd3000

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.229620] bf20: dafd3000 00000000 00000002 ffffff9c ffffff9c 00000003 dafd3000 00000005

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.245485] bf40: da65bf94 da65bf50 c012c2b4 c013b7f4 da65a000 00000000 da65bfa4 00020241

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.261336] bf60: c00381b6 00000022 00000300 00000001 7f6585fc 7f6564ac 80efe1d8 00000005

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.277185] bf80: c000f9e8 da65a000 da65bfa4 da65bf98 c012c3b0 c012c1b4 00000000 da65bfa8

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.293046] bfa0: c000f820 c012c390 7f6585fc 7f6564ac 7f6585fc 00020241 000001b6 00000000

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.308900] bfc0: 7f6585fc 7f6564ac 80efe1d8 00000005 7f6564a8 00000003 be8827b8 7f6585fc

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.324755] bfe0: 7f655dc8 be882780 7f64ea98 b6f173dc 60000010 7f6585fc 00000000 00000000

Message from syslogd@raspberrypi at Mar 14 18:17:59 ...
 kernel:[  625.439040] Code: 10401248 00608040 11201020 00000240 (da553680)