I am running Linux 3.4.0 on embedded ARM target and getting following Oops every-time. I am not able to pin-point the reason for crash and which driver module triggered it. How can I decode the values in the registers at the time of crash. It's showing all in hex. [ 492.713897] ------------[ cut here ]------------ [ 492.718841] WARNING: at mm/slub.c:3415 ksize+0x70/0xc4() [ 492.725311] ---[ end trace 90a5ae2bdb3ab657 ]--- [ 492.915618] ------------[ cut here ]------------ [ 492.920593] WARNING: at mm/slub.c:3415 ksize+0x70/0xc4() [ 492.927032] ---[ end trace 90a5ae2bdb3ab658 ]--- [ 493.113464] Unable to handle kernel paging request at virtual address f6b9f777 [ 493.124298] pgd = ec4c4000 [ 493.127166] [f6b9f777] *pgd=00000000 [ 493.130981] Internal error: Oops: 5 [#1] PREEMPT SMP ARM [ 493.136596] Modules linked in: snd_soc_omap5_nbtevo snd_soc_nbtevo_j5 snd_soc_omap_mcbsp snd_soc_omap snd_soc_core regmap_spi snd_pcm snd_timer snd soundcore snd_page_alloc smsc95xx stm_arm stm_fw stmmac asix usbnet dev_navsens hbiipc ehci_hcd usbcore spi_omap2_mcspi_slave usb_common [ 493.163421] CPU: 0 Tainted: G W (3.4.0 #15) [ 493.169158] PC is at __kmalloc_track_caller+0xa4/0x1ec [ 493.174591] LR is at 0x80569dc0 [ 493.177917] pc : [<801094d8>] lr : [<80569dc0>] psr: a0000113 [ 493.177947] sp : 80569dc0 ip : 89011b70 fp : 80569dfc [ 493.190124] r10: 00001fea r9 : 00000001 r8 : 00000000 [ 493.195648] r7 : 00000940 r6 : 000000d1 r5 : ed002900 r4 : f6b9f777 [ 493.202575] r3 : 80568000 r2 : 00000000 r1 : 08aa8000 r0 : 80589c00 [ 493.209503] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel [ 493.217254] Control: 10c5387d Table: ec4c406a DAC: 00000015 [ 493.223358] [ 493.223358] PC: 0x80109458: [ 493.227874] 9458 e50b2030 9a000006 e2405001 e1a03625 e16f2f13 e2622020 ebfff28d e1a05000 [ 493.236633] 9478 ea000063 ebffef61 e3500010 e1a05000 9a00005f e1a0e00d e3cead7f e3ca303f [ 493.245361] 9498 e59f0178 e5954000 e5938014 e7901108 e084c001 e59ca004 e7944001 e3540000 [ 493.254089] 94b8 1a000005 e1a00005 e1a01006 e51b2030 eb0b01e9 e1a04000 ea00001d e5952014 [ 493.262817] 94d8 e7941002 e10f8000 f10c0080 e5939014 e595e000 e790c109 e1a0200e e792900c [ 493.271545] 94f8 e1590004 1a00000c e28ee004 e79ee00c e15e000a 1a000008 e782100c e5932014 [ 493.280273] 9518 e28e3002 e595c000 e7900102 e28cc004 e78c3000 e3a03001 ea000000 e3a03000 [ 493.289001] 9538 e121f008 e3530000 0affffd1 e1a00005 ebffeb01 e7e017d6 e3540000 03a01000 [ 493.297729] [ 493.297729] LR: 0x80569d40: [ 493.302246] 9d40 00000000 803616d0 0000560c ec430480 80569d74 80569d60 801094d8 a0000113 [ 493.310974] 9d60 ffffffff 80569dac 80569dfc 80569d78 8000e598 80008494 80589c00 08aa8000 [ 493.319702] 9d80 00000000 80568000 f6b9f777 ed002900 000000d1 00000940 00000000 00000001 [ 493.328460] 9da0 00001fea 80569dfc 89011b70 80569dc0 80569dc0 801094d8 a0000113 ffffffff [ 493.337188] 9dc0 80107b00 80104160 80569e04 80336530 8033ef68 ec5c2840 ed002100 000000d1 [ 493.345916] 9de0 80336530 00000881 00000001 00000000 80569e24 80569e00 80335ec0 80109440 [ 493.354644] 9e00 ed0b8000 0000002b 838512c0 87c20100 00000800 ed0b8600 80569e3c 80569e28 [ 493.363372] 9e20 80336530 80335e6c 00000000 ed0b84c0 80569e84 80569e40 7f078788 80336510 [ 493.372100] [ 493.372100] SP: 0x80569d40: [ 493.376617] 9d40 00000000 803616d0 0000560c ec430480 80569d74 80569d60 801094d8 a0000113 [ 493.385345] 9d60 ffffffff 80569dac 80569dfc 80569d78 8000e598 80008494 80589c00 08aa8000 [ 493.394073] 9d80 00000000 80568000 f6b9f777 ed002900 000000d1 00000940 00000000 00000001 [ 493.402832] 9da0 00001fea 80569dfc 89011b70 80569dc0 80569dc0 801094d8 a0000113 ffffffff [ 493.411560] 9dc0 80107b00 80104160 80569e04 80336530 8033ef68 ec5c2840 ed002100 000000d1 [ 493.420288] 9de0 80336530 00000881 00000001 00000000 80569e24 80569e00 80335ec0 80109440 [ 493.429016] 9e00 ed0b8000 0000002b 838512c0 87c20100 00000800 ed0b8600 80569e3c 80569e28 [ 493.437744] 9e20 80336530 80335e6c 00000000 ed0b84c0 80569e84 80569e40 7f078788 80336510 [ 493.446472] [ 493.446472] IP: 0x89011af0: [ 493.450988] 1af0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.459716] 1b10 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.468444] 1b30 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.477172] 1b50 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.485900] 1b70 f6b9f777 00001fea 880fa100 880f8a00 00000000 00000000 00000000 00000000 [ 493.494659] 1b90 00000000 00000000 00000000 00000000 ec438be0 00001710 88d88700 88d91520 [ 493.503387] 1bb0 00000000 00000000 00000000 00000000 805b571c 00000001 00000000 00000000 [ 493.512115] 1bd0 00000001 00000000 00000000 89011bdc 89011bdc 00000000 89011be8 89011be8 [ 493.520843] [ 493.520843] FP: 0x80569d7c: [ 493.525360] 9d7c 08aa8000 00000000 80568000 f6b9f777 ed002900 000000d1 00000940 00000000 [ 493.534088] 9d9c 00000001 00001fea 80569dfc 89011b70 80569dc0 80569dc0 801094d8 a0000113 [ 493.542816] 9dbc ffffffff 80107b00 80104160 80569e04 80336530 8033ef68 ec5c2840 ed002100 [ 493.551544] 9ddc 000000d1 80336530 00000881 00000001 00000000 80569e24 80569e00 80335ec0 [ 493.560272] 9dfc 80109440 ed0b8000 0000002b 838512c0 87c20100 00000800 ed0b8600 80569e3c [ 493.569000] 9e1c 80569e28 80336530 80335e6c 00000000 ed0b84c0 80569e84 80569e40 7f078788 [ 493.577758] 9e3c 80336510 80569e64 80569e50 00000040 00000040 0000002c 83851000 80569e84 [ 493.586486] 9e5c ed0b8600 8900f900 8033f1b4 7f0781f8 0000012c 8900f908 00000040 80569ebc [ 493.595214] [ 493.595214] R0: 0x80589b80: [ 493.599731] 9b80 00000000 00000000 00000000 00000000 80589b90 80589b90 00000000 00000000 [ 493.608459] 9ba0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.617187] 9bc0 00000080 8901d080 00000008 8901d0c0 00008000 0000000f 8901d100 00000002 [ 493.625915] 9be0 8900d000 0000002c 8901d000 8901d040 00000001 00001000 00000000 00000001 [ 493.634643] 9c00 08aa8000 08ab0000 000107ff 00000001 000ed593 000ffffe 00000000 00000032 [ 493.643371] 9c20 0000fffa 00000001 ed002100 00000003 ed18a9d0 ed1b6c00 00000012 89021200 [ 493.652099] 9c40 0003ffff ed003580 ed002480 00000064 00000011 0001ffff 89121200 ed003600 [ 493.660827] 9c60 00100000 ed00c000 00000003 ed002100 00000001 804bf780 00000000 00000004 [ 493.669555] [ 493.669586] R3: 0x80567f80: [ 493.674102] 7f80 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.682830] 7fa0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.691558] 7fc0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.700286] 7fe0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.709014] 8000 00000000 00000104 00000000 8058bad8 805afcc0 00000000 00000015 8900f380 [ 493.717742] 8020 8058bad8 ec8c8000 00000000 ec81efc0 803ce744 00000000 80569f6c 80569ee8 [ 493.726470] 8040 803ce4a8 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.735198] 8060 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 493.743927] [ 493.743927] R4: 0xf6b9f6f7: [ 493.748474] f6f4 ******** ******** ******** ******** ******** ******** ******** ******** [ 493.757202] f714 ******** ******** ******** ******** ******** ******** ******** ******** [ 493.765960] f734 ******** ******** ******** ******** ******** ******** ******** ******** [ 493.774688] f754 ******** ******** ******** ******** ******** ******** ******** ******** [ 493.783416] f774 ******** ******** ******** ******** ******** ******** ******** ******** [ 493.792175] f794 ******** ******** ******** ******** ******** ******** ******** ******** [ 493.800903] f7b4 ******** ******** ******** ******** ******** ******** ******** ******** [ 493.809631] f7d4 ******** ******** ******** ******** ******** ******** ******** ******** [ 493.818389] f7f4 ******** ******** ******** ******** ******** ******** ******** ******** [ 493.827117] [ 493.827117] R5: 0xed002880: [ 493.831665] 2880 80569b58 00004000 00000005 00000800 00000800 00000000 00000006 00030010 [ 493.840393] 28a0 00030010 00000002 00004001 00000001 00000000 00000800 00000040 00000000 [ 493.849121] 28c0 ed0003c0 ed002844 ed002944 ed362c40 ed002850 ed002950 ec9f8950 ec9f8940 [ 493.857849] 28e0 805b7168 ed362cc0 00000001 00000007 ed001440 fdfcbc7b ff53ffaf 7be877af [ 493.866577] 2900 80569b70 00004000 00000006 00001000 00001000 00000000 00000002 00030008 [ 493.875305] 2920 00030008 00000001 00004001 00000001 00000000 00001000 00000040 00000000 [ 493.884033] 2940 ed000400 ed0028c4 ed0029c4 ed362300 ed0028d0 ed0029d0 ec9f8950 ec9f8940 [ 493.892761] 2960 805b7168 ed362380 00000001 00000007 ed001480 fb9d6fe0 fb7eb763 b9fe336a [ 493.901489] Process swapper/0 (pid: 0, stack limit = 0x805682f8) [ 493.907867] Stack: (0x80569dc0 to 0x8056a000) [ 493.912475] 9dc0: 80107b00 80104160 80569e04 80336530 8033ef68 ec5c2840 ed002100 000000d1 [ 493.921173] 9de0: 80336530 00000881 00000001 00000000 80569e24 80569e00 80335ec0 80109440 [ 493.929840] 9e00: ed0b8000 0000002b 838512c0 87c20100 00000800 ed0b8600 80569e3c 80569e28 [ 493.938507] 9e20: 80336530 80335e6c 00000000 ed0b84c0 80569e84 80569e40 7f078788 80336510 [ 493.947204] 9e40: 80569e64 80569e50 00000040 00000040 0000002c 83851000 80569e84 ed0b8600 [ 493.955871] 9e60: 8900f900 8033f1b4 7f0781f8 0000012c 8900f908 00000040 80569ebc 80569e88 [ 493.964569] 9e80: 8033f23c 7f078204 8900d9c8 0000608f cf3ece3f 00000001 8056a08c 8033f1b4 [ 493.973236] 9ea0: 00000102 0000000a 00000000 00000003 80569ef4 80569ec0 80045fb4 8033f1c0 [ 493.981903] 9ec0: 00000000 800a1a74 8056fbc0 80568000 00000000 ffffffff 80569f74 8000406a [ 493.990600] 9ee0: 410fc0f0 00000000 80569f0c 80569ef8 8004659c 80045e94 0000020c 00000078 [ 493.999267] 9f00: 80569f24 80569f10 8000fa08 80046550 fa212000 80569f40 80569f3c 80569f28 [ 494.007934] 9f20: 80008658 8000f988 8000fd50 60000013 80569f94 80569f40 8000e600 8000861c [ 494.016632] 9f40: 80568018 8000fd1c 00000000 805d75c0 00000002 805d6d00 8900aa80 8058cbcc [ 494.025299] 9f60: 8000406a 410fc0f0 00000000 80569f94 80569f74 80569f88 8002633c 8000fd50 [ 494.033966] 9f80: 60000013 ffffffff 80569fa4 80569f98 80010130 8000fd28 80569fbc 80569fa8 [ 494.042663] 9fa0: 803b9c0c 80010080 8054ff08 80589a10 80569ff4 80569fc0 8051f828 803b9b9c [ 494.051330] 9fc0: 00000000 00000000 8051f278 00000000 00000000 80548098 00000000 10c5387d [ 494.059997] 9fe0: 80588dbc 80547c94 00000000 80569ff8 80008044 8051f580 00000000 00000000 [ 494.068664] Backtrace: [ 494.071289] [<80109434>] (__kmalloc_track_caller+0x0/0x1ec) from [<80335ec0>] (__alloc_skb+0x60/0xfc) [ 494.081085] [<80335e60>] (__alloc_skb+0x0/0xfc) from [<80336530>] (__netdev_alloc_skb+0x2c/0x54) [ 494.090423] [<80336504>] (__netdev_alloc_skb+0x0/0x54) from [<7f078788>] (stmmac_poll+0x590/0x794 [stmmac]) [ 494.100738] r4:ed0b84c0 r3:00000000 [ 494.104553] [<7f0781f8>] (stmmac_poll+0x0/0x794 [stmmac]) from [<8033f23c>] (net_rx_action+0x88/0x1f0) [ 494.114440] [<8033f1b4>] (net_rx_action+0x0/0x1f0) from [<80045fb4>] (__do_softirq+0x12c/0x260) [ 494.123657] [<80045e88>] (__do_softirq+0x0/0x260) from [<8004659c>] (irq_exit+0x58/0xb0) [ 494.132263] [<80046544>] (irq_exit+0x0/0xb0) from [<8000fa08>] (handle_IRQ+0x8c/0xc8) [ 494.140563] r4:00000078 r3:0000020c [ 494.144378] [<8000f97c>] (handle_IRQ+0x0/0xc8) from [<80008658>] (gic_handle_irq+0x48/0x6c) [ 494.153228] r5:80569f40 r4:fa212000 [ 494.157043] [<80008610>] (gic_handle_irq+0x0/0x6c) from [<8000e600>] (__irq_svc+0x40/0x70) [ 494.165802] Exception stack(0x80569f40 to 0x80569f88) [ 494.171173] 9f40: 80568018 8000fd1c 00000000 805d75c0 00000002 805d6d00 8900aa80 8058cbcc [ 494.179840] 9f60: 8000406a 410fc0f0 00000000 80569f94 80569f74 80569f88 8002633c 8000fd50 [ 494.188507] 9f80: 60000013 ffffffff [ 494.192230] r5:60000013 r4:8000fd50 [ 494.196014] [<8000fd1c>] (default_idle+0x0/0x3c) from [<80010130>] (cpu_idle+0xbc/0x120) [ 494.204620] [<80010074>] (cpu_idle+0x0/0x120) from [<803b9c0c>] (rest_init+0x7c/0x94) [ 494.212921] [<803b9b90>] (rest_init+0x0/0x94) from [<8051f828>] (start_kernel+0x2b4/0x2fc) [ 494.221710] r4:80589a10 r3:8054ff08 [ 494.225494] [<8051f574>] (start_kernel+0x0/0x2fc) from [<80008044>] (0x80008044) [ 494.233367] Code: eb0b01e9 e1a04000 ea00001d e5952014 (e7941002) [ 494.240142] ---[ end trace 90a5ae2bdb3ab659 ]--- [ 494.245117] Kernel panic - not syncing: Fatal exception in interrupt [ 494.251892] CPU1: stopping [ 494.254760] Backtrace: [ 494.257354] [<80012f64>] (dump_backtrace+0x0/0x114) from [<803c76fc>] (dump_stack+0x20/0x24) [ 494.266204] r6:00000001 r5:00000001 r4:ed091f70 r3:00000000 [ 494.266235] [<803c76dc>] (dump_stack+0x0/0x24) from [<80014944>] (handle_IPI+0x10c/0x1e4) [ 494.273132] [<80014838>] (handle_IPI+0x0/0x1e4) from [<80008674>] (gic_handle_irq+0x64/0x6c) [ 494.289703] r7:ed091ed4 r6:ffffffff r5:ed091ea0 r4:fa212000 [ 494.289703] [<80008610>] (gic_handle_irq+0x0/0x6c) from [<8000e600>] (__irq_svc+0x40/0x70) [ 494.304382] Exception stack(0xed091ea0 to 0xed091ee8) [ 494.304382] 1ea0: ed090028 ed091ee8 ed090000 805f8b00 00000202 ed090028 ffffffff ed091f70 [ 494.312194] 1ec0: 0000000a 00000001 00000000 ed091f1c 00000000 ed091ee8 00000001 80045eec [ 494.326873] 1ee0: 20000113 ffffffff [ 494.327819] r5:20000113 r4:80045eec [ 494.334320] [<80045e88>] (__do_softirq+0x0/0x260) from [<8004659c>] (irq_exit+0x58/0xb0) [ 494.342834] [<80046544>] (irq_exit+0x0/0xb0) from [<80014908>] (handle_IPI+0xd0/0x1e4) [ 494.351165] r4:00000000 r3:00000001 [ 494.354949] [<80014838>] (handle_IPI+0x0/0x1e4) from [<80008674>] (gic_handle_irq+0x64/0x6c) [ 494.363830] r7:ed091fa4 r6:ffffffff r5:ed091f70 r4:fa212000 [ 494.369812] [<80008610>] (gic_handle_irq+0x0/0x6c) from [<8000e600>] (__irq_svc+0x40/0x70) [ 494.378509] Exception stack(0xed091f70 to 0xed091fb8) [ 494.378509] 1f60: ed090008 8000fd1c 00000000 805d75c0 [ 494.392425] 1f80: 00000001 00000001 805d6ff0 805d7004 8000406a 410fc0f0 00000000 ed091fc4 [ 494.398132] 1fa0: ed091fa4 ed091fb8 8002633c 8000fd50 60000013 ffffffff [ 494.407958] r5:60000013 r4:8000fd50 [ 494.407958] [<8000fd1c>] (default_idle+0x0/0x3c) from [<80010130>] (cpu_idle+0xbc/0x120) [ 494.420257] [<80010074>] (cpu_idle+0x0/0x120) from [<803c4538>] (secondary_start_kernel+0x110/0x128) [ 494.429382] [<803c4428>] (secondary_start_kernel+0x0/0x128) from [<803c3e74>] (__enable_mmu+0x0/0x2c) [ 494.439575] r6:10c0387d r5:00000015 r4:ed08006a r3:803c3e5c [ 494.445556] panic occurred, switching back to text console [ 497.913726] [ 497.913726] [ 497.913726] Error: McSPI_RX_DMA: FIFO Overrun..(1) [ 497.913726] -- Manavendra Nath Manav