Help debugging linux-next.

Sun Sep 13 13:33:44 EDT 2015

I'm tried to compile a few older commits and run, but none of them boot and
I can't get the status of the issue.

--
Lucas Tanure
+55 (19) 988176559

On Sun, Sep 13, 2015 at 2:24 PM, Raul Piper <raulpblooper at gmail.com> wrote:

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