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Date: Tue, 3 Jul 2018 18:26:46 +0200
From: Thierry Escande <thierry.escande@...aro.org>
To: kernel test robot <lkp@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Linux Memory Management List <linux-mm@...ck.org>,
linux-kernel@...r.kernel.org, LKP <lkp@...org>
Subject: Re: [lkp-robot] ee410f15b1 BUG: kernel hang in boot stage
On 03/07/2018 04:51, kernel test robot wrote:
>
> Greetings,
>
> 0day kernel testing robot got the below dmesg and the first bad commit is
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>
> commit ee410f15b1418f2f4428e79980674c979081bcb7
> Author: Thierry Escande <thierry.escande@...aro.org>
> AuthorDate: Thu Jun 14 15:28:15 2018 -0700
> Commit: Linus Torvalds <torvalds@...ux-foundation.org>
> CommitDate: Fri Jun 15 07:55:25 2018 +0900
>
> lib/test_printf.c: call wait_for_random_bytes() before plain %p tests
This patch is already reverted in Linus tree. It's also been superseded
in linux-next by a new version.
Regards,
Thierry
>
> If the test_printf module is loaded before the crng is initialized, the
> plain 'p' tests will fail because the printed address will not be hashed
> and the buffer will contain '(ptrval)' instead.
>
> This patch adds a call to wait_for_random_bytes() before plain 'p' tests
> to make sure the crng is initialized.
>
> Link: http://lkml.kernel.org/r/20180604113708.11554-1-thierry.escande@linaro.org
> Signed-off-by: Thierry Escande <thierry.escande@...aro.org>
> Acked-by: Tobin C. Harding <me@...in.cc>
> Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>
> Cc: David Miller <davem@...emloft.net>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
>
> 608dbdfb1f hexagon: drop the unused variable zero_page_mask
> ee410f15b1 lib/test_printf.c: call wait_for_random_bytes() before plain %p tests
> 883c9ab9eb Merge branch 'parisc-4.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
> e3c7283c19 Add linux-next specific files for 20180629
> +-------------------------------+------------+------------+------------+---------------+
> | | 608dbdfb1f | ee410f15b1 | 883c9ab9eb | next-20180629 |
> +-------------------------------+------------+------------+------------+---------------+
> | boot_successes | 35 | 0 | 19 | 13 |
> | boot_failures | 0 | 15 | | |
> | BUG:kernel_hang_in_boot_stage | 0 | 15 | | |
> +-------------------------------+------------+------------+------------+---------------+
>
> [ 9.488584] -------------
> [ 9.491008] Testing concurrent rhashtable access from 10 threads
> [ 21.577749] test 3125 add/delete pairs into rhlist
> [ 21.734553] test 3125 random rhlist add/delete operations
> [ 21.813107] Started 10 threads, 0 failed, rhltable test returns 0
> BUG: kernel hang in boot stage
>
>
> # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
> git bisect start 7daf201d7fe8334e2d2364d4e8ed3394ec9af819 v4.17 --
> git bisect good a16afaf7928b74c30a4727cdcaa67bd10675a55d # 08:00 G 11 0 0 0 Merge tag 'for-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply
> git bisect good dc594c39f7a9dcdfd5dbb1a446ac6d06182e2472 # 08:13 G 11 0 0 0 Merge tag 'ceph-for-4.18-rc1' of git://github.com/ceph/ceph-client
> git bisect bad 81e97f01371f4e1701feeafe484665112cd9ddc2 # 08:33 B 0 1 15 0 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
> git bisect bad 35773c93817c5f2df264d013978e7551056a063a # 08:55 B 0 1 15 0 Merge branch 'afs-proc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
> git bisect bad 8949170cf48e91da7e4e69a59e2842d81d9a5885 # 09:26 B 0 1 15 0 Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
> git bisect bad becfc5e97cbab00b25a592aabc36838ec7217d1f # 09:49 B 0 10 24 0 Merge tag 'drm-next-2018-06-15' of git://anongit.freedesktop.org/drm/drm
> git bisect good 7a932516f55cdf430c7cce78df2010ff7db6b874 # 10:21 G 11 0 0 0 Merge tag 'vfs-timespec64' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground
> git bisect bad b5d903c2d656e9bc54bc76554a477d796a63120d # 10:44 B 0 1 15 0 Merge branch 'akpm' (patches from Andrew)
> git bisect good 3fb3894b84c2e0f83cb1e4f4e960243742e6b3a6 # 11:06 G 10 0 0 0 kernel/relay.c: change return type to vm_fault_t
> git bisect good 14f28f5776927be30717986f86b765d49eec392c # 11:20 G 10 0 0 0 ipc: use new return type vm_fault_t
> git bisect good fe6bdfc8e1e131720abbe77a2eb990c94c9024cb # 11:44 G 10 0 0 0 mm: fix oom_kill event handling
> git bisect good 608dbdfb1f0299f4500e56d62b0d84c44dcfa3be # 11:56 G 11 0 0 0 hexagon: drop the unused variable zero_page_mask
> git bisect bad ee410f15b1418f2f4428e79980674c979081bcb7 # 12:16 B 0 1 15 0 lib/test_printf.c: call wait_for_random_bytes() before plain %p tests
> # first bad commit: [ee410f15b1418f2f4428e79980674c979081bcb7] lib/test_printf.c: call wait_for_random_bytes() before plain %p tests
> git bisect good 608dbdfb1f0299f4500e56d62b0d84c44dcfa3be # 12:42 G 30 0 0 0 hexagon: drop the unused variable zero_page_mask
> # extra tests with debug options
> git bisect bad ee410f15b1418f2f4428e79980674c979081bcb7 # 13:00 B 0 11 25 0 lib/test_printf.c: call wait_for_random_bytes() before plain %p tests
> # extra tests on HEAD of linux-devel/devel-catchup-201807010645
> git bisect bad 52e245677317cd2f35888d20fbdf8f72f1b62841 # 13:00 B 0 33 50 0 0day head guard for 'devel-catchup-201807010645'
> # extra tests on tree/branch linus/master
> git bisect good 883c9ab9eb595f8542d01e55d29a346c8d96862e # 13:12 G 11 0 0 0 Merge branch 'parisc-4.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
> # extra tests on tree/branch linux-next/master
> git bisect good e3c7283c19cd9ba999794f38007389ac83408a78 # 13:42 G 11 0 0 0 Add linux-next specific files for 20180629
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/lkp Intel Corporation
>
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