[ 174.397521] calling dma_alloc_coherent [ 174.397552] Unable to handle kernel NULL pointer dereference at virtual address 000000d0 [ 174.397705] pgd = d8e80000 [ 174.397766] [000000d0] *pgd=98db6831, *pte=00000000, *ppte=00000000 [ 174.398132] Internal error: Oops: 817 [#1] [ 174.398193] Modules linked in: c64(O) aes_generic bluetooth wl1251_sdio wl1251 mac80211 cfg80211 g_cdc ecb omaplfb(O) pvrsrvkm(O) zram(C) snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss ipv6 fuse ads7846 hwmon [last unloaded: c64] [ 174.399963] CPU: 0 Tainted: G C O (3.2.45 #894) [ 174.400115] PC is at 0xd8e3a90c [ 174.400177] LR is at cma_test_write+0x60/0xd0 [c64] [ 174.400268] pc : [] lr : [] psr: a0000013 [ 174.400268] sp : d8eb3f38 ip : d8e3a90c fp : 000a3008 [ 174.400482] r10: 00000000 r9 : d8eb2000 r8 : d8eb2000 [ 174.400634] r7 : d8eb3f80 r6 : 400de000 r5 : 00000006 r4 : bf1c57f0 [ 174.400695] r3 : 000000d0 r2 : d8eb3f44 r1 : 00400000 r0 : d8e3a800 [ 174.400848] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 174.400970] Control: 10c5387d Table: 98e80019 DAC: 55555555 [ 174.401062] Process sh (pid: 2105, stack limit = 0xd8eb2238) [ 174.401184] Stack: (0xd8eb3f38 to 0xd8eb4000) [ 174.401275] 3f20: 00000000 d8ea2c80 [ 174.401428] 3f40: 00000000 400de000 d8eb3f80 d8ea2c80 00000006 c00d0b2c fffffff6 c0043528 [ 174.401519] 3f60: 00000003 00000000 00000000 d8ea2c80 400de000 00000006 00000000 c00d0e2c [ 174.401641] 3f80: 00000000 00000000 000a3008 00000000 00000006 400de000 403075d0 00000004 [ 174.401794] 3fa0: c0013e28 c0013c80 00000006 400de000 00000001 400de000 00000006 00000000 [ 174.401947] 3fc0: 00000006 400de000 403075d0 00000004 00000006 000a33f0 00000001 000a3008 [ 174.402008] 3fe0: 00000000 bedd0550 40245028 4029850c 60000010 00000001 00000000 00000000 [ 174.402191] [] (cma_test_write+0x60/0xd0 [c64]) from [] (vfs_write+0xb4/0x184) [ 174.402343] [] (vfs_write+0xb4/0x184) from [] (sys_write+0x40/0x70) [ 174.402496] [] (sys_write+0x40/0x70) from [] (ret_fast_syscall+0x0/0x30) [ 174.402587] Code: 00000000 00000000 00000000 00000000 (d8e3a90c) [ 174.402770] ---[ end trace 881d9ab367d2fd96 ]---