Hi Steven,
I am trying to trace some stuff on Samsung's Arndale Board (ARM) with 3.13-rc1 and seeing these crashes/segmentation faults whenever I try to trace syscalls.
Is this a know issue? Or something new?
trace-cmd version 2.2.0
[ 299.998874] Unable to handle kernel NULL pointer dereference at virtual address 0000001b [ 300.005554] pgd = ed9fc000 [ 300.008201] [0000001b] *pgd=6eb1e831, *pte=00000000, *ppte=00000000 [ 300.014428] Internal error: Oops: 17 [#1] PREEMPT SMP ARM [ 300.019812] Modules linked in: [ 300.022847] CPU: 0 PID: 2172 Comm: is-cpu-isolated Not tainted 3.13.0-rc1-00090-gd6eaf98-dirty #141 [ 300.031880] task: ee9a9680 ti: eddfc000 task.ti: eddfc000 [ 300.037263] PC is at ftrace_syscall_enter+0x44/0x17c [ 300.042208] LR is at syscall_trace_enter+0xf8/0x138 [ 300.047066] pc : [<c00ad654>] lr : [<c0010eb0>] psr: a0000013 [ 300.047066] sp : eddfdf40 ip : eddfdf80 fp : eddfdf7c [ 300.058529] r10: 00001400 r9 : eddfc000 r8 : c000eea4 [ 300.063731] r7 : eddfdfb0 r6 : eddfc000 r5 : ffffffff r4 : 000f0005 [ 300.070242] r3 : eddfc000 r2 : 000f001d r1 : eddfdfb0 r0 : c06cb2f8 [ 300.076754] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 300.083872] Control: 10c5387d Table: 6d9fc06a DAC: 00000015 [ 300.089599] Process is-cpu-isolated (pid: 2172, stack limit = 0xeddfc240) [ 300.096370] Stack: (0xeddfdf40 to 0xeddfe000) [ 300.100711] df40: ef1c5910 00000000 eddfdf8c 00000022 00000003 ede2c490 000f0005 eddfc000 [ 300.108872] df60: eddfdfb0 c000eea4 eddfc000 00001400 eddfdfa4 eddfdf80 c0010eb0 c00ad61c [ 300.117034] df80: b6f824c0 b6f83c90 00000001 00000000 000f0005 c000eea4 00000000 eddfdfa8 [ 300.125194] dfa0: c000ee4c c0010dc4 b6f83c90 00000001 b6f824c0 b6f88050 b6f82b98 b6f824c0 [ 300.133352] dfc0: b6f83c90 00000001 00000000 000f0005 00000001 00000000 0009688c b6f88958 [ 300.141511] dfe0: 000f0005 bef66460 b6f698fb b6f79966 80000030 b6f824c0 00000000 00000000 [ 300.149678] [<c00ad654>] (ftrace_syscall_enter+0x44/0x17c) from [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) [ 300.159573] [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) from [<c000ee4c>] (__sys_trace+0xc/0x38) [ 300.168510] Code: e2842018 e7905102 e3550000 0a000038 (e595201c) [ 300.174595] ---[ end trace f8b3633d964e9e60 ]--- [ 300.179189] note: is-cpu-isolated[2172] exited with preempt_count 1 Segmentation fault [ 300.956933] Unable to handle kernel NULL pointer dereference at virtual address 0000001b [ 300.963587] pgd = ed9fc000 [ 300.966234] [0000001b] *pgd=6ebd3831, *pte=00000000, *ppte=00000000 [ 300.972483] Internal error: Oops: 17 [#2] PREEMPT SMP ARM [ 300.977867] Modules linked in: [ 300.980903] CPU: 0 PID: 2173 Comm: trace-cmd Tainted: G D 3.13.0-rc1-00090-gd6eaf98-dirty #141 [ 300.990372] task: ee9aa1c0 ti: eddfe000 task.ti: eddfe000 [ 300.995752] PC is at ftrace_syscall_enter+0x44/0x17c [ 301.000700] LR is at syscall_trace_enter+0xf8/0x138 [ 301.005557] pc : [<c00ad654>] lr : [<c0010eb0>] psr: a0000013 [ 301.005557] sp : eddfff40 ip : eddfff80 fp : eddfff7c [ 301.017022] r10: 00001400 r9 : eddfe000 r8 : c000eea4 [ 301.022222] r7 : eddfffb0 r6 : eddfe000 r5 : ffffffff r4 : 000f0005 [ 301.028733] r3 : eddfe000 r2 : 000f001d r1 : eddfffb0 r0 : c06cb2f8 [ 301.035244] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 301.042362] Control: 10c5387d Table: 6d9fc06a DAC: 00000015 [ 301.048089] Process trace-cmd (pid: 2173, stack limit = 0xeddfe240) [ 301.054340] Stack: (0xeddfff40 to 0xede00000) [ 301.058679] ff40: eddfffb0 ef09a280 eddfff8c eddfff58 c00ad2d0 ede2c490 000f0005 eddfe000 [ 301.066843] ff60: eddfffb0 c000eea4 eddfe000 00001400 eddfffa4 eddfff80 c0010eb0 c00ad61c [ 301.075002] ff80: 000bc320 000bc318 00000008 00000010 000f0005 c000eea4 00000000 eddfffa8 [ 301.083162] ffa0: c000ee4c c0010dc4 000bc318 00000008 000be4c0 000b2018 00000000 000bc320 [ 301.091321] ffc0: 000bc318 00000008 00000010 000f0005 00000038 000be4c0 00000004 00000001 [ 301.099480] ffe0: 000f0005 be9cc6d8 0002ed43 0002ef66 40000030 000be4c0 6f7fd821 6f7fdc21 [ 301.107645] [<c00ad654>] (ftrace_syscall_enter+0x44/0x17c) from [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) [ 301.117540] [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) from [<c000ee4c>] (__sys_trace+0xc/0x38) [ 301.126477] Code: e2842018 e7905102 e3550000 0a000038 (e595201c) [ 301.132565] ---[ end trace f8b3633d964e9e61 ]--- [ 301.137158] note: trace-cmd[2173] exited with preempt_count 1 Segmentation fault [ 301.922253] Unable to handle kernel NULL pointer dereference at virtual address 0000001b [ 301.928899] pgd = eda00000 [ 301.931556] [0000001b] *pgd=6d9f2831, *pte=00000000, *ppte=00000000 [ 301.937803] Internal error: Oops: 17 [#3] PREEMPT SMP ARM [ 301.943187] Modules linked in: [ 301.946223] CPU: 0 PID: 2174 Comm: cat Tainted: G D 3.13.0-rc1-00090-gd6eaf98-dirty #141 [ 301.955172] task: ee9aa580 ti: ed9f8000 task.ti: ed9f8000 [ 301.960552] PC is at ftrace_syscall_enter+0x44/0x17c [ 301.965500] LR is at syscall_trace_enter+0xf8/0x138 [ 301.970356] pc : [<c00ad654>] lr : [<c0010eb0>] psr: a0000013 [ 301.970356] sp : ed9f9f40 ip : ed9f9f80 fp : ed9f9f7c [ 301.981820] r10: 00001400 r9 : ed9f8000 r8 : c000eea4 [ 301.987021] r7 : ed9f9fb0 r6 : ed9f8000 r5 : ffffffff r4 : 000f0005 [ 301.993532] r3 : ed9f8000 r2 : 000f001d r1 : ed9f9fb0 r0 : c06cb2f8 [ 302.000044] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 302.007161] Control: 10c5387d Table: 6da0006a DAC: 00000015 [ 302.012888] Process cat (pid: 2174, stack limit = 0xed9f8240) [ 302.018617] Stack: (0xed9f9f40 to 0xed9fa000) [ 302.022958] 9f40: ed9f9fb0 00000000 ed9f9f8c 00000022 00000003 ede2c490 000f0005 ed9f8000 [ 302.031122] 9f60: ed9f9fb0 c000eea4 ed9f8000 00001400 ed9f9fa4 ed9f9f80 c0010eb0 c00ad61c [ 302.039281] 9f80: b6f6d840 b6f6d178 00000001 00000000 000f0005 c000eea4 00000000 ed9f9fa8 [ 302.047440] 9fa0: c000ee4c c0010dc4 b6f6d178 00000001 b6f6d840 b6f72050 b6f6df18 b6f6d840 [ 302.055599] 9fc0: b6f6d178 00000001 00000000 000f0005 00000001 00000000 0000e67c b6f72958 [ 302.063758] 9fe0: 000f0005 beaf6480 b6f538fb b6f63966 80000030 b6f6d840 00000000 00000000 [ 302.071922] [<c00ad654>] (ftrace_syscall_enter+0x44/0x17c) from [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) [ 302.081819] [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) from [<c000ee4c>] (__sys_trace+0xc/0x38) [ 302.090756] Code: e2842018 e7905102 e3550000 0a000038 (e595201c) [ 302.096845] ---[ end trace f8b3633d964e9e62 ]--- [ 302.101436] note: cat[2174] exited with preempt_count 1 Segmentation fault [ 302.881881] Unable to handle kernel NULL pointer dereference at virtual address 0000001b [ 302.888532] pgd = ed9fc000 [ 302.891180] [0000001b] *pgd=6eb1e831, *pte=00000000, *ppte=00000000 [ 302.897429] Internal error: Oops: 17 [#4] PREEMPT SMP ARM [ 302.902813] Modules linked in: [ 302.905849] CPU: 0 PID: 2175 Comm: trace-cmd Tainted: G D 3.13.0-rc1-00090-gd6eaf98-dirty #141 [ 302.915319] task: ee9aa1c0 ti: ee492000 task.ti: ee492000 [ 302.920698] PC is at ftrace_syscall_enter+0x44/0x17c [ 302.925645] LR is at syscall_trace_enter+0xf8/0x138 [ 302.930503] pc : [<c00ad654>] lr : [<c0010eb0>] psr: a0000013 [ 302.930503] sp : ee493f40 ip : ee493f80 fp : ee493f7c [ 302.941967] r10: 00001400 r9 : ee492000 r8 : c000eea4 [ 302.947169] r7 : ee493fb0 r6 : ee492000 r5 : ffffffff r4 : 000f0005 [ 302.953679] r3 : ee492000 r2 : 000f001d r1 : ee493fb0 r0 : c06cb2f8 [ 302.960190] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 302.967307] Control: 10c5387d Table: 6d9fc06a DAC: 00000015 [ 302.973035] Process trace-cmd (pid: 2175, stack limit = 0xee492240) [ 302.979286] Stack: (0xee493f40 to 0xee494000) [ 302.983625] 3f40: ee493fb0 ef09a280 ee493f8c ee493f58 c00ad2d0 ede2c490 000f0005 ee492000 [ 302.991789] 3f60: ee493fb0 c000eea4 ee492000 00001400 ee493fa4 ee493f80 c0010eb0 c00ad61c [ 302.999948] 3f80: 000bc320 000bc318 00000008 00000010 000f0005 c000eea4 00000000 ee493fa8 [ 303.008108] 3fa0: c000ee4c c0010dc4 000bc318 00000008 000be4c0 000b2018 00000000 000bc320 [ 303.016267] 3fc0: 000bc318 00000008 00000010 000f0005 00000038 000be4c0 00000004 00000001 [ 303.024426] 3fe0: 000f0005 be8c76c8 0002ed43 0002ef66 40000030 000be4c0 00000000 00000000 [ 303.032591] [<c00ad654>] (ftrace_syscall_enter+0x44/0x17c) from [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) [ 303.042487] [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) from [<c000ee4c>] (__sys_trace+0xc/0x38) [ 303.051423] Code: e2842018 e7905102 e3550000 0a000038 (e595201c) [ 303.057512] ---[ end trace f8b3633d964e9e63 ]--- [ 303.062103] note: trace-cmd[2175] exited with preempt_count 1 Segmentation fault [ 303.842447] Unable to handle kernel NULL pointer dereference at virtual address 0000001b [ 303.849096] pgd = eddfc000 [ 303.851752] [0000001b] *pgd=6d9f1831, *pte=00000000, *ppte=00000000 [ 303.858002] Internal error: Oops: 17 [#5] PREEMPT SMP ARM [ 303.863386] Modules linked in: [ 303.866422] CPU: 0 PID: 2176 Comm: is-cpu-isolated Tainted: G D 3.13.0-rc1-00090-gd6eaf98-dirty #141 [ 303.876412] task: ee9a9680 ti: ed9fa000 task.ti: ed9fa000 [ 303.881791] PC is at ftrace_syscall_enter+0x44/0x17c [ 303.886738] LR is at syscall_trace_enter+0xf8/0x138 [ 303.891596] pc : [<c00ad654>] lr : [<c0010eb0>] psr: a0000013 [ 303.891596] sp : ed9fbf40 ip : ed9fbf80 fp : ed9fbf7c [ 303.903059] r10: 00001400 r9 : ed9fa000 r8 : c000eea4 [ 303.908261] r7 : ed9fbfb0 r6 : ed9fa000 r5 : ffffffff r4 : 000f0005 [ 303.914772] r3 : ed9fa000 r2 : 000f001d r1 : ed9fbfb0 r0 : c06cb2f8 [ 303.921283] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 303.928400] Control: 10c5387d Table: 6ddfc06a DAC: 00000015 [ 303.934128] Process is-cpu-isolated (pid: 2176, stack limit = 0xed9fa240) [ 303.940900] Stack: (0xed9fbf40 to 0xed9fc000) [ 303.945239] bf40: ed9fbfb0 00000000 ed9fbf8c 00000022 00000003 ede2c490 000f0005 ed9fa000 [ 303.953403] bf60: ed9fbfb0 c000eea4 ed9fa000 00001400 ed9fbfa4 ed9fbf80 c0010eb0 c00ad61c [ 303.961562] bf80: b6f174c0 b6f18c90 00000001 00000000 000f0005 c000eea4 00000000 ed9fbfa8 [ 303.969721] bfa0: c000ee4c c0010dc4 b6f18c90 00000001 b6f174c0 b6f1d050 b6f17b98 b6f174c0 [ 303.977880] bfc0: b6f18c90 00000001 00000000 000f0005 00000001 00000000 0009688c b6f1d958 [ 303.986039] bfe0: 000f0005 be90c460 b6efe8fb b6f0e966 80000030 b6f174c0 6f7fd821 6f7fdc21 [ 303.994204] [<c00ad654>] (ftrace_syscall_enter+0x44/0x17c) from [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) [ 304.004101] [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) from [<c000ee4c>] (__sys_trace+0xc/0x38) [ 304.013037] Code: e2842018 e7905102 e3550000 0a000038 (e595201c) [ 304.019125] ---[ end trace f8b3633d964e9e64 ]--- [ 304.023717] note: is-cpu-isolated[2176] exited with preempt_count 1 Segmentation fault Saved trace in: dft [ 304.807095] Unable to handle kernel NULL pointer dereference at virtual address 0000001b [ 304.813737] pgd = ed9fc000 [ 304.816395] [0000001b] *pgd=6eb1e831, *pte=00000000, *ppte=00000000 [ 304.822644] Internal error: Oops: 17 [#6] PREEMPT SMP ARM [ 304.828029] Modules linked in: [ 304.831065] CPU: 0 PID: 2177 Comm: sync Tainted: G D 3.13.0-rc1-00090-gd6eaf98-dirty #141 [ 304.840100] task: ee9aa1c0 ti: ee492000 task.ti: ee492000 [ 304.845479] PC is at ftrace_syscall_enter+0x44/0x17c [ 304.850426] LR is at syscall_trace_enter+0xf8/0x138 [ 304.855284] pc : [<c00ad654>] lr : [<c0010eb0>] psr: a0000013 [ 304.855284] sp : ee493f40 ip : ee493f80 fp : ee493f7c [ 304.866749] r10: 00001400 r9 : ee492000 r8 : c000eea4 [ 304.871950] r7 : ee493fb0 r6 : ee492000 r5 : ffffffff r4 : 000f0005 [ 304.878461] r3 : ee492000 r2 : 000f001d r1 : ee493fb0 r0 : c06cb2f8 [ 304.884972] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 304.892089] Control: 10c5387d Table: 6d9fc06a DAC: 00000015 [ 304.897816] Process sync (pid: 2177, stack limit = 0xee492240) [ 304.903632] Stack: (0xee493f40 to 0xee494000) [ 304.907973] 3f40: ee493fb0 00000000 ee493f8c 00000022 00000003 ede2c490 000f0005 ee492000 [ 304.916137] 3f60: ee493fb0 c000eea4 ee492000 00001400 ee493fa4 ee493f80 c0010eb0 c00ad61c [ 304.924296] 3f80: b6fa8840 b6fa8178 00000001 00000000 000f0005 c000eea4 00000000 ee493fa8 [ 304.932455] 3fa0: c000ee4c c0010dc4 b6fa8178 00000001 b6fa8840 b6fad050 b6fa8f18 b6fa8840 [ 304.940615] 3fc0: b6fa8178 00000001 00000000 000f0005 00000001 00000000 0000b0d8 b6fad958 [ 304.948773] 3fe0: 000f0005 bebbb4a0 b6f8e8fb b6f9e966 80000030 b6fa8840 00000000 00000000 [ 304.956937] [<c00ad654>] (ftrace_syscall_enter+0x44/0x17c) from [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) [ 304.966834] [<c0010eb0>] (syscall_trace_enter+0xf8/0x138) from [<c000ee4c>] (__sys_trace+0xc/0x38) [ 304.975771] Code: e2842018 e7905102 e3550000 0a000038 (e595201c) [ 304.981859] ---[ end trace f8b3633d964e9e65 ]--- [ 304.986451] note: sync[2177] exited with preempt_count 1 Segmentation fault
-- viresh