Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is https://github.com/0day-ci/linux Geert-Uytterhoeven/Add-HD44780-Character-LCD-support/20170206-225742 commit cdcb352cdba7559c3e450f6dc0b365a1fc27faef Author: Geert Uytterhoeven <geert(a)linux-m68k.org&gt; AuthorDate: Mon Feb 6 15:38:11 2017 +0100 Commit: 0day robot <fengguang.wu(a)intel.com&gt; CommitDate: Mon Feb 6 22:57:49 2017 +0800 auxdisplay: charlcd: Extract character LCD core from misc/panel Extract the character LCD core from the Parallel port LCD/Keypad Panel driver in the misc subsystem, and convert it into a subdriver in the auxdisplay subsystem. This allows the character LCD core to be used by other drivers later. Compilation is controlled by its own Kconfig symbol CHARLCD, which is to be selected by its users, but can be enabled manually for compile-testing. All functions changed their prefix from "lcd_" to "charlcd_", and gained a "struct charlcd *" parameter to operate on a specific instance. While the driver API thus is ready to support multiple instances, the current limitation of a single display (/dev/lcd has a single misc minor assigned) is retained. No functional changes intended. Signed-off-by: Geert Uytterhoeven <geert(a)linux-m68k.org&gt; +-------------------------------------------------+------------+------------+------------+ | | e1792a60e1 | cdcb352cdb | 6916040948 | +-------------------------------------------------+------------+------------+------------+ | boot_successes | 64 | 0 | 0 | | boot_failures | 2 | 22 | 13 | | BUG:kernel_reboot-without-warning_in_test_stage | 2 | | | | INFO:trying_to_register_non-static_key | 0 | 22 | 13 | +-------------------------------------------------+------------+------------+------------+ [ 6.923024] parport0: PC-style at 0x378, irq 7 [PCSPP(,...)] [ 6.929389] ibmasm: IBM ASM Service Processor Driver version 1.0 loaded [ 6.929389] ibmasm: IBM ASM Service Processor Driver version 1.0 loaded [ 7.036785] INFO: trying to register non-static key. [ 7.036785] INFO: trying to register non-static key. [ 7.038916] the code is fine but needs lockdep annotation. [ 7.038916] the code is fine but needs lockdep annotation. [ 7.041191] turning off the locking correctness validator. [ 7.041191] turning off the locking correctness validator. [ 7.043647] CPU: 0 PID: 1 Comm: swapper Not tainted 4.10.0-rc7-00133-gcdcb352 #2 [ 7.043647] CPU: 0 PID: 1 Comm: swapper Not tainted 4.10.0-rc7-00133-gcdcb352 #2 [ 7.046960] Call Trace: [ 7.046960] Call Trace: [ 7.048089] dump_stack+0x19/0x1b [ 7.048089] dump_stack+0x19/0x1b [ 7.049694] register_lock_class+0x12f/0x2fa git bisect start 691604094882dd7cacfc5a6cb99918a50e1f7e70 d5adbfcd5f7bcc6fa58a41c5c5ada0e5c826ce2c -- git bisect good 2ada4336df0cc3db96edac0722eb68fdb4009537 # 03:48 22+ 0 Merge 'namhyung-perf/perf/diff-delta-abs-v1' into devel-catchup-201702070104 git bisect good 1e46e4a05a72278d0738a04061e969960ae75bc5 # 04:29 22+ 0 Merge 'linux-review/Richard-Leitner/usb-misc-add-USB251xB-xBi-Hi-Speed-Hub-Controller-Driver/20170206-220950' into devel-catchup-201702070104 git bisect bad b96fd90dbd7d72104a79cb2b87a180216271c69d # 05:00 0- 7 Merge 'iommu/arm/core' into devel-catchup-201702070104 git bisect bad 6d02899f91bb4e332459c4eda3793785c40976e2 # 05:13 0- 6 Merge 'hverkuil-media/sama5d3' into devel-catchup-201702070104 git bisect good 4b4a3027af35eb69bce1727eaabaf3da54f080da # 05:30 22+ 0 Merge 'linux-review/Cheah-Kok-Cheong/scripts-checkincludes-add-exit-message-for-no-duplicates-found/20170206-224241' into devel-catchup-201702070104 git bisect good c06282ba22c87dd00f6305ded3f4381d4c5aab56 # 05:53 20+ 0 Merge 'perf/perf/core' into devel-catchup-201702070104 git bisect bad cf3aa68bf1c5c6d134e09f7d21003c84df63fe7d # 06:08 0- 2 Merge 'linux-review/Geert-Uytterhoeven/Add-HD44780-Character-LCD-support/20170206-225742' into devel-catchup-201702070104 git bisect good bd58941b08cb6657205b980c5da7682f8ad1ef41 # 06:38 20+ 0 misc: panel: Add lcd_home() helper git bisect bad 234bf551433cdecbd25593a2bce8b72e7e7280f5 # 06:50 0- 3 auxdisplay: charlcd: Add support for 4-bit interfaces git bisect bad cdcb352cdba7559c3e450f6dc0b365a1fc27faef # 07:15 0- 2 auxdisplay: charlcd: Extract character LCD core from misc/panel git bisect good e1792a60e10daf3a273332dce849c2d922272e5c # 07:25 20+ 0 misc: panel: Abstract temporary backlight handling # first bad commit: [cdcb352cdba7559c3e450f6dc0b365a1fc27faef] auxdisplay: charlcd: Extract character LCD core from misc/panel git bisect good e1792a60e10daf3a273332dce849c2d922272e5c # 07:32 62+ 2 misc: panel: Abstract temporary backlight handling # extra tests with CONFIG_DEBUG_INFO_REDUCED git bisect bad cdcb352cdba7559c3e450f6dc0b365a1fc27faef # 08:05 0- 1 auxdisplay: charlcd: Extract character LCD core from misc/panel # extra tests on HEAD of linux-devel/devel-catchup-201702070104 git bisect bad 691604094882dd7cacfc5a6cb99918a50e1f7e70 # 08:06 0- 13 0day head guard for 'devel-catchup-201702070104' # extra tests on tree/branch linux-review/Geert-Uytterhoeven/Add-HD44780-Character-LCD-support/20170206-225742 git bisect bad 35cb5b31397ef24e055b5311109422b6beaf5c85 # 08:23 0- 28 auxdisplay: Add HD44780 Character LCD support # extra tests on tree/branch linus/master git bisect good f7d6040aa45df6ffd9e891114125dc919f18b96b # 08:36 62+ 0 Merge tag 'pm-4.10-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm # extra tests on tree/branch linux-next/master git bisect good ce05054690c4e11ea08a3c883c5428f5a4dd92c2 # 08:39 64+ 0 Add linux-next specific files for 20170206 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation