Hi!
pavel@n900:/sys$ uname -a Linux n900 4.16.0-rc4-next-20180308 #71 Thu Mar 8 15:27:49 CET 2018 armv7l GNU/Linux pavel@n900:/sys$ grep -ri fasdfasdf .
leads to an oops:
[ 2278.331878] DSS: context saved [ 2278.820343] Unable to handle kernel NULL pointer dereference at virtual address 00000004 [ 2278.828948] pgd = c36040a2 [ 2278.831787] [00000004] *pgd=876c4831, *pte=00000000, *ppte=00000000 [ 2278.838439] Internal error: Oops: 17 [#1] ARM [ 2278.843017] Modules linked in: [ 2278.846221] CPU: 0 PID: 16337 Comm: grep Tainted: G W 4.16.0-rc4-next-20180308 #71 [ 2278.855529] Hardware name: Nokia RX-51 board [ 2278.860015] PC is at soc_codec_reg_show+0x8/0x19c [ 2278.864959] LR is at codec_reg_show+0x28/0x30 [ 2278.869506] pc : [<c0598f84>] lr : [<c0599140>] psr: a0000013 [ 2278.876098] sp : ce063e10 ip : cd7a9000 fp : 00000001 [ 2278.881561] r10: cd7a8000 r9 : c0842a04 r8 : 00001000 [ 2278.887023] r7 : 00000fff r6 : ce69fd80 r5 : 00000000 r4 : 00000000 [ 2278.893890] r3 : ce5d2000 r2 : 00001000 r1 : cd7a8000 r0 : 00000000 [ 2278.900726] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none [ 2278.908203] Control: 10c5387d Table: 87664019 DAC: 00000051 [ 2278.914215] Process grep (pid: 16337, stack limit = 0x2c91d92b) [ 2278.920410] Stack: (0xce063e10 to 0xce064000) [ 2278.924987] 3e00: ce063ed0 00000000 00000000 ce063ed0 [ 2278.933563] 3e20: 00000000 00000000 00000000 c01e113c 00000000 ce063ed0 ce063f74 c01e5068 [ 2278.942138] 3e40: c059c388 00000000 00000000 ce69fd80 00000fff 00001000 c0842a04 cd7a8000 [ 2278.950714] 3e60: 00000001 c0599140 00000000 00000000 00000040 c7699200 c0c4a0c8 c0412f14 [ 2278.959289] 3e80: c0412ef8 c7699200 ce597008 c023d598 ce063ec0 00008000 cd7a6000 ce063f80 [ 2278.967895] 3ea0: c7699200 c7699230 00000001 c023bf90 c023bf6c c01fab30 00042000 00000000 [ 2278.976470] 3ec0: 00000000 00000000 00000000 00000000 00000000 c080f7c4 00042000 cd7a6000 [ 2278.985046] 3ee0: ce063f80 00008000 ce062000 00042000 00041f90 c01d82e8 5aa1523b 34732c66 [ 2278.993621] 3f00: 5aa1523b 34732c66 00004024 00000000 00000000 00000000 0003520c c718eaf0 [ 2279.002197] 3f20: 00020000 cd7a6008 00000004 ce063f80 ce062000 00042000 00041f90 c02fad9c [ 2279.010772] 3f40: 00000000 00008000 cd7a6000 00042000 00000000 ce063f80 00042000 c01d8464 [ 2279.019348] 3f60: 00000010 cd7a6000 00000000 00000000 cd7a6000 cd7a6000 00008000 c01d88ec [ 2279.027923] 3f80: 00000000 00000000 beaa2744 00035330 00042000 00008000 00000003 c01011e4 [ 2279.036499] 3fa0: 00000000 c0101000 00035330 00042000 00000004 00042000 00008000 00008000 [ 2279.045074] 3fc0: 00035330 00042000 00008000 00000003 00001000 00000000 7fffffff 00041f90 [ 2279.053649] 3fe0: 00000000 beaa2748 0000d350 b6eb78dc 40000010 00000004 00000000 00000000 [ 2279.062255] [<c0598f84>] (soc_codec_reg_show) from [<c0599140>] (codec_reg_show+0x28/0x30) [ 2279.070922] [<c0599140>] (codec_reg_show) from [<c0412f14>] (dev_attr_show+0x1c/0x4c) [ 2279.079162] [<c0412f14>] (dev_attr_show) from [<c023d598>] (sysfs_kf_seq_show+0x90/0x108) [ 2279.087738] [<c023d598>] (sysfs_kf_seq_show) from [<c023bf90>] (kernfs_seq_show+0x24/0x28) [ 2279.096435] [<c023bf90>] (kernfs_seq_show) from [<c01fab30>] (seq_read+0x1dc/0x500) [ 2279.104461] [<c01fab30>] (seq_read) from [<c01d82e8>] (__vfs_read+0x2c/0x120) [ 2279.111968] [<c01d82e8>] (__vfs_read) from [<c01d8464>] (vfs_read+0x88/0x114) [ 2279.119445] [<c01d8464>] (vfs_read) from [<c01d88ec>] (SyS_read+0x40/0x8c) [ 2279.126678] [<c01d88ec>] (SyS_read) from [<c0101000>] (ret_fast_syscall+0x0/0x54) [ 2279.134521] Exception stack(0xce063fa8 to 0xce063ff0) [ 2279.139801] 3fa0: 00035330 00042000 00000004 00042000 00008000 00008000 [ 2279.148376] 3fc0: 00035330 00042000 00008000 00000003 00001000 00000000 7fffffff 00041f90 [ 2279.156951] 3fe0: 00000000 beaa2748 0000d350 b6eb78dc [ 2279.162261] Code: ea05f08a c09c66ec e92d4ff0 e24dd034 (e5905004) [ 2279.168792] ---[ end trace cbbe0b4a3061a0e7 ]---