[ 33.535692] Unable to handle kernel paging request for data at address 0x00000008 [ 33.566786] Faulting instruction address: 0xc049db84 [ 33.574188] Vector: 300 (Data Access) at [eeb13c20] [ 33.579086] pc: c049db84: radeon_audio_enable+0x4/0x18 [ 33.584630] lr: c049e2f4: radeon_audio_detect+0x288/0x290 [ 33.590429] sp: eeb13cd0 [ 33.593310] msr: 29000 [ 33.595931] dar: 8 [ 33.598207] dsisr: 0 [ 33.600480] current = 0xeea93ac0 [ 33.603885] pid = 2311, comm = Xorg [ 33.607922] enter ? for help [ 33.610806] [link register ] c049e2f4 radeon_audio_detect+0x288/0x290 [ 33.617469] [eeb13cd0] c049e254 radeon_audio_detect+0x1e8/0x290 (unreliable) [ 33.624571] [eeb13d00] c03dfe7c radeon_dvi_detect+0x388/0x3ac [ 33.630369] [eeb13d30] c038b9d4 drm_helper_probe_single_connector_modes_merge_bits+0xf4/0x434 [ 33.638954] [eeb13d70] c03a7670 drm_mode_getconnector+0xf4/0x334 [ 33.645022] [eeb13e10] c039a8c0 drm_ioctl+0x348/0x464 [ 33.650135] [eeb13ed0] c00d0ca0 do_vfs_ioctl+0x52c/0x6e8 [ 33.655507] [eeb13f20] c00d0e9c SyS_ioctl+0x40/0x68 [ 33.660438] [eeb13f40] c000ab04 ret_from_syscall+0x0/0x3c [ 33.665896] --- Exception: c01 (System Call) at 6fb1b8dc [ 33.671253] SP (bfa56d20) is in userspace [ 33.675263] mon> <no input ...> [ 35.703835] Oops: Kernel access of bad area, sig: 11 [#1] [ 35.709554] PREEMPT Canyonlands [ 35.712876] Modules linked in: cfg80211 snd_ice1724 snd_hda_codec_hdmi snd_ak4113 snd_pt2258 snd_ak4114 snd_i2c snd_ice17xx_ak4xxx snd_ak4xxx_adda snd_ac97_codec snd_hda_intel ac97_bus snd_hda_controller snd_rawmidi snd_hda_codec snd_seq_device snd_pcm snd_timer snd [ 35.738047] CPU: 0 PID: 2311 Comm: Xorg Not tainted 4.0.0-rc1-Sam460ex #1 [ 35.745189] task: eea93ac0 ti: eeb12000 task.ti: eeb12000 [ 35.750872] NIP: c049db84 LR: c049e2f4 CTR: 00000000 [ 35.756098] REGS: eeb13c20 TRAP: 0300 Not tainted (4.0.0-rc1-Sam460ex) [ 35.763241] MSR: 00029000 <CE,EE,ME> CR: 24004422 XER: 20000000 [ 35.769778] DEAR: 00000008 ESR: 00000000 GPR00: c049e254 eeb13cd0 eea93ac0 eaa84000 00000000 0000000f ee0532c0 000190d6 GPR08: eab6da00 00000000 00000000 eeb13cb0 28004422 b7a11ff4 b7a87a98 b7a87988 GPR16: 00000000 ffffffff 00000000 eeb13e18 eaa08194 eaa08178 00000001 00004000 GPR24: 00004000 c071cd28 fffffff2 00000000 eab6c000 eaa84000 eab6da00 eab80400 [ 35.804302] NIP [c049db84] radeon_audio_enable+0x4/0x18 [ 35.809799] LR [c049e2f4] radeon_audio_detect+0x288/0x290 [ 35.815480] Call Trace: [ 35.818053] [eeb13cd0] [c049e254] radeon_audio_detect+0x1e8/0x290 (unreliable) [ 35.825694] [eeb13d00] [c03dfe7c] radeon_dvi_detect+0x388/0x3ac [ 35.831956] [eeb13d30] [c038b9d4] drm_helper_probe_single_connector_modes_merge_bits+0xf4/0x434 [ 35.841137] [eeb13d70] [c03a7670] drm_mode_getconnector+0xf4/0x334 [ 35.847663] [eeb13e10] [c039a8c0] drm_ioctl+0x348/0x464 [ 35.853183] [eeb13ed0] [c00d0ca0] do_vfs_ioctl+0x52c/0x6e8 [ 35.858974] [eeb13f20] [c00d0e9c] SyS_ioctl+0x40/0x68 [ 35.864307] [eeb13f40] [c000ab04] ret_from_syscall+0x0/0x3c [ 35.870196] --- interrupt: c01 at 0x6fb1b8dc [ 35.870196] LR = 0x6fb1b800 [ 35.877971] Instruction dump: [ 35.881106] 8129012c 806a0018 2f890000 419e0018 81290004 2f890000 419e000c 7d2903a6

Thanks

after skipping several times :

git bisect skip

There are only 'skip'ped commits left to test.
The first bad commit could be any of:
b486e0e6d599b9ca8667fb9a7d49b7383ee963c7
eab3bbeffd152125ae0f90863b8e9bc8eef49423
960cd9d4fef6dd9e235c0e5c0d4ed027f8a48025
f02ad907cd9e7fe3a6405d2d005840912f1ed258
6a425c2a9b37ca3d2c37e3c1cdf973dba53eaa79
ee0a89cf3c2c550e6d877dda21dd2947afb90cb6
92890583627ee2a0518e55b063fcff86826fef96
95d6eb3b134e1826ed04cc92b224d93de13e281f
9469244d869623e8b54d9f3d4d00737e377af273
We cannot bisect more!

On 2/24/2015 3:14 PM, Gerhard Pircher wrote:

drivers/built-in.o: In function `drm_mode_atomic_ioctl': (.text+0x865dc): undefined reference to `__get_user_bad' make: *** [vmlinux] Error 1 root@julian-VirtualBox:/usr/src/linux# git bisect log git bisect start # bad: [c517d838eb7d07bbe9507871fab3931deccff539] Linux 4.0-rc1 git bisect bad c517d838eb7d07bbe9507871fab3931deccff539 # good: [bfa76d49576599a4b9f9b7a71f23d73d6dcff735] Linux 3.19 git bisect good bfa76d49576599a4b9f9b7a71f23d73d6dcff735 # good: [02f1f2170d2831b3233e91091c60a66622f29e82] kernel.h: remove ancient __FUNCTION__ hack git bisect good 02f1f2170d2831b3233e91091c60a66622f29e82 # bad: [796e1c55717e9a6ff5c81b12289ffa1ffd919b6f] Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux git bisect bad 796e1c55717e9a6ff5c81b12289ffa1ffd919b6f # good: [9682ec9692e5ac11c6caebd079324e727b19e7ce] Merge tag 'driver-core-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core git bisect good 9682ec9692e5ac11c6caebd079324e727b19e7ce # good: [a9724125ad014decf008d782e60447c811391326] Merge tag 'tty-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty git bisect good a9724125ad014decf008d782e60447c811391326 # good: [f43dff0ee00a259f524ce17ba4f8030553c66590] Merge tag 'drm-amdkfd-next-fixes-2015-01-25' of git://people.freedesktop.org/~gabbayo/linux into drm-next git bisect good f43dff0ee00a259f524ce17ba4f8030553c66590 # bad: [cffe1e89dc9bf541a39d9287ced7c5addff07084] drm: sti: HDMI add audio infoframe git bisect bad cffe1e89dc9bf541a39d9287ced7c5addff07084 # good: [2f5b4ef15c60bc5292a3f006c018acb3da53737b] Merge tag 'drm/tegra/for-3.20-rc1' of git://anongit.freedesktop.org/tegra/linux into drm-next git bisect good 2f5b4ef15c60bc5292a3f006c018acb3da53737b # bad: [865844448ce80ccd714793e9ba4140d7ae214229] drm/udl: optimize udl_compress_hline16 (v2) git bisect bad 865844448ce80ccd714793e9ba4140d7ae214229 # bad: [d47df63393ed81977e0f6435988d9cbd70c867f7] drm/panel: simple: Add AVIC TM070DDH03 panel support git bisect bad d47df63393ed81977e0f6435988d9cbd70c867f7 # bad: [9469244d869623e8b54d9f3d4d00737e377af273] drm/atomic: Fix potential use of state after free git bisect bad 9469244d869623e8b54d9f3d4d00737e377af273 root@julian-VirtualBox:/usr/src/linux#