<p dir="ltr">I m a <a href="http://newbie.is">newbie.is</a> there a doc which developers follow for using git-bisect.google misleads !!</p>
<div class="gmail_quote">On Sep 13, 2015 10:50 PM, "leo kirotawa" <<a href="mailto:kirotawa@gmail.com">kirotawa@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">git bisect would be a choice.<br>
Seems your issue is around i915, that is related to intel graphics,<br>
isolate commits in this area would be another way<br>
<br>
<br>
<br>
On Sun, Sep 13, 2015 at 2:09 PM, Lucas Tanure <<a href="mailto:tanure@linux.com">tanure@linux.com</a>> wrote:<br>
> Hi,<br>
><br>
> I would like some tips about how debug a issue with linux-next.<br>
> I'm trying to find things to do in kernel, and the first thing is boot the<br>
> linux-next tree.<br>
><br>
> I'm able to compile the source, but when I boot I got a black screen a few<br>
> times, or a just a warn in dmesg.<br>
><br>
> I'm trying to understand the issue, but no success. I tried to get kdump<br>
> from the issue, but didn't work. I also tried to go back a few commits in<br>
> linux-next, but my system doesn't boot at all.<br>
><br>
> How I can find the commit that create the problem, since every commit that I<br>
> tested I got black screen ?<br>
> Whats the best way to debug this kind of issue ?<br>
><br>
> Thanks!<br>
><br>
> My full warning:<br>
><br>
> ------------[ cut here ]------------<br>
> WARNING: CPU: 3 PID: 243 at drivers/gpu/drm/drm_drv.c:569<br>
> drm_dev_alloc+0x251/0x320 [drm]()<br>
> Modules linked in: i915(+) joydev input_leds mousedev intel_rapl iosf_mbi<br>
> x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm ttm hid_generic<br>
> drm_kms_helper crct10dif_pclmul snd_hda_intel crc32_pclmul usbhid<br>
> snd_hda_codec crc32c_intel drm hid ghash_clmulni_intel snd_hda_core<br>
> eeepc_wmi asus_wmi aesni_intel iTCO_wdt sparse_keymap snd_hwdep led_class<br>
> aes_x86_64 lrw snd_pcm iTCO_vendor_support rfkill mxm_wmi evdev gf128mul<br>
> intel_gtt e1000e glue_helper mac_hid snd_timer syscopyarea ablk_helper<br>
> cryptd sysfillrect psmouse snd sysimgblt pcspkr fb_sys_fops ptp mei_me<br>
> i2c_i801 i2c_algo_bit soundcore mei shpchp i2c_core pps_core lpc_ich<br>
> serio_raw wmi fan battery processor thermal video button sch_fq_codel<br>
> ip_tables x_tables ext4 crc16 mbcache jbd2 sd_mod atkbd libps2 ahci libahci<br>
> libata<br>
> xhci_pci xhci_hcd ehci_pci ehci_hcd scsi_mod usbcore usb_common i8042 serio<br>
> CPU: 3 PID: 243 Comm: systemd-udevd Not tainted 4.2.0-next-20150912-ARCH #5<br>
> Hardware name: System manufacturer System Product Name/Maximus IV GENE-Z,<br>
> BIOS 3603 11/09/2012<br>
> 0000000000000000 000000005ca47666 ffff88060f70b9d0 ffffffff812b9159<br>
> 0000000000000000 ffff88060f70ba08 ffffffff81074e62 ffff880612d39000<br>
> ffffffffa06c7100 ffff880612f66098 ffffffffa06c7100 ffffffffa0691760<br>
> Call Trace:<br>
> [<ffffffff812b9159>] dump_stack+0x4b/0x72<br>
> [<ffffffff81074e62>] warn_slowpath_common+0x82/0xc0<br>
> [<ffffffff81074faa>] warn_slowpath_null+0x1a/0x20<br>
> [<ffffffffa0422291>] drm_dev_alloc+0x251/0x320 [drm]<br>
> [<ffffffffa0424d0b>] drm_get_pci_dev+0x3b/0x1e0 [drm]<br>
> [<ffffffffa05dd2d4>] i915_pci_probe+0x34/0x50 [i915]<br>
> [<ffffffff812fdec5>] local_pci_probe+0x45/0xa0<br>
> [<ffffffff812fde10>] ? pci_match_device+0xe0/0x110<br>
> [<ffffffff812ff053>] pci_device_probe+0x103/0x150<br>
> [<ffffffff813d7942>] driver_probe_device+0x222/0x490<br>
> [<ffffffff813d7c34>] __driver_attach+0x84/0x90<br>
> [<ffffffff813d7bb0>] ? driver_probe_device+0x490/0x490<br>
> [<ffffffff813d557c>] bus_for_each_dev+0x6c/0xc0<br>
> [<ffffffff813d70fe>] driver_attach+0x1e/0x20<br>
> [<ffffffff813d6c4b>] bus_add_driver+0x1eb/0x280<br>
> [<ffffffff813d8540>] driver_register+0x60/0xe0<br>
> [<ffffffff812fd73c>] __pci_register_driver+0x4c/0x50<br>
> [<ffffffffa0424f90>] drm_pci_init+0xe0/0x110 [drm]<br>
> [<ffffffffa06e6000>] ? 0xffffffffa06e6000<br>
> [<ffffffffa06e60a4>] i915_init+0xa4/0xab [i915]<br>
> [<ffffffff81002123>] do_one_initcall+0xb3/0x200<br>
> [<ffffffff81199801>] ? __vunmap+0x91/0xe0<br>
> [<ffffffff811589a0>] do_init_module+0x5f/0x1ef<br>
> [<ffffffff810fa707>] load_module+0x2197/0x27e0<br>
> [<ffffffff810f7550>] ? symbol_put_addr+0x50/0x50<br>
> [<ffffffff81188695>] ? __pte_alloc_kernel+0xa5/0xf0<br>
> [<ffffffff810fae9e>] SyS_init_module+0x14e/0x190<br>
> [<ffffffff8157046e>] entry_SYSCALL_64_fastpath+0x12/0x71<br>
> ---[ end trace d2652104b24a32ff ]---<br>
><br>
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<br>
<br>
<br>
--<br>
<br>
----------------------------------------------<br>
Leônidas S. Barbosa (Kirotawa)<br>
blog: <a href="http://corecode.wordpress.com" rel="noreferrer" target="_blank">corecode.wordpress.com</a><br>
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</blockquote></div>