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Date: Fri, 24 Feb 2017 14:37:04 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...nel.org>
Cc: LKP <lkp@...org>, LKML <linux-kernel@...r.kernel.org>,
wfg@...ux.intel.com
Subject: Re: [Merge branch 'core-debugobjects-for-linus' of git] 575260e3f8:
WARNING: CPU: 0 PID: 1 at kernel/time/hrtimer.c:1090 hrtimer_init
This looks like two -tip trees together show some issue - the timer
updates from Thomas triggering a debugobjects check from Ingo, thus
fingering my merge as the culprit.
Added Thomas/Ingo to the cc, leaving everything quoted for their
edification and enjoyment.
Linus
On Thu, Feb 23, 2017 at 10:45 PM, kernel test robot
<fengguang.wu@...el.com> 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 575260e3f8f8ac72dc0c41a4a20190d1a5f2b887
> Merge: 1cd4027 0cad93c3
> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> AuthorDate: Mon Feb 20 11:19:09 2017 -0800
> Commit: Linus Torvalds <torvalds@...ux-foundation.org>
> CommitDate: Mon Feb 20 11:19:09 2017 -0800
>
> Merge branch 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
>
> Pull debugobjects updates from Ingo Molnar:
> "A number of scalability improvements by Waimang Long"
>
> * 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
> debugobjects: Improve variable naming
> debugobjects: Reduce contention on the global pool_lock
> debugobjects: Scale thresholds with # of CPUs
> debugobjects: Track number of kmem_cache_alloc/kmem_cache_free done
>
> 1cd4027cfe Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> 0cad93c345 debugobjects: Improve variable naming
> 575260e3f8 Merge branch 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> +------------------------------------------------+------------+------------+------------+
> | | 1cd4027cfe | 0cad93c345 | 575260e3f8 |
> +------------------------------------------------+------------+------------+------------+
> | boot_successes | 202 | 90 | 0 |
> | boot_failures | 0 | 2 | 26 |
> | invoked_oom-killer:gfp_mask=0x | 0 | 2 | 1 |
> | Mem-Info | 0 | 2 | 1 |
> | WARNING:at_kernel/time/hrtimer.c:#hrtimer_init | 0 | 0 | 26 |
> +------------------------------------------------+------------+------------+------------+
>
> [ 6.585095] usbcore: registered new interface driver rndis_wlan
> [ 6.586060] mac80211_hwsim: initializing netlink
> [ 6.587805] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
> [ 6.589765] ieee80211 phy0: hwaddr 02:00:00:00:00:00 registered
> [ 6.590718] ------------[ cut here ]------------
> [ 6.591473] WARNING: CPU: 0 PID: 1 at kernel/time/hrtimer.c:1090 hrtimer_init+0x11f/0x199
> [ 6.592949] Invalid clockid 4. Using MONOTONIC
> [ 6.593646] Modules linked in:
> [ 6.594202] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.10.0-00312-g575260e3 #2
> [ 6.595371] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
> [ 6.596852] Call Trace:
> [ 6.597330] dump_stack+0x82/0xb8
> [ 6.597908] __warn+0xc2/0xdd
> [ 6.598446] warn_slowpath_fmt+0x4b/0x53
> [ 6.599090] ? lock_is_held_type+0x4b/0x54
> [ 6.599748] hrtimer_init+0x11f/0x199
> [ 6.600372] ? mac80211_hwsim_get_tsf+0x1d/0x1d
> [ 6.601089] tasklet_hrtimer_init+0x1b/0x4f
> [ 6.601758] mac80211_hwsim_new_radio+0x7fe/0x916
> [ 6.602491] ? set_debug_rodata+0x12/0x12
> [ 6.603149] init_mac80211_hwsim+0x138/0x29f
> [ 6.603834] ? rndis_wlan_driver_init+0x1b/0x1b
> [ 6.604542] do_one_initcall+0x90/0x142
> [ 6.605176] ? set_debug_rodata+0x12/0x12
> [ 6.605833] kernel_init_freeable+0x1cb/0x258
> [ 6.606522] ? rest_init+0x13b/0x13b
> [ 6.607126] kernel_init+0xe/0xf5
> [ 6.607693] ret_from_fork+0x31/0x40
> [ 6.608341] ---[ end trace e131c19313689169 ]---
> [ 6.609819] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
>
> git bisect start 37c85961c3f87f2141c84e53df31e59db072fd2e v4.10 --
> git bisect bad fd4a61e08aa79f2b7835b25c6f94f27bd2d65990 # 03:55 0- 10 sched/core: Fix build paravirt build on arm and arm64
> git bisect bad 280d7a1edef214eefb1cb34915c73767355dd1b3 # 04:24 0- 6 Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect bad 32e2d7c8afb35d59fbf7d96619538427568ecb68 # 05:02 0- 3 Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect good c9b9f207b90468bf9583f7ed71c15d0142bbf9b1 # 05:06 20+ 1 Merge tag 'for-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply
> git bisect good 1cd4027cfe33390dc3f442aea8e7caeeeaa861a1 # 07:19 22+ 0 Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect bad 575260e3f8f8ac72dc0c41a4a20190d1a5f2b887 # 07:37 0- 16 Merge branch 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect good 97dd552eb23c83dbf626a6e84666c7e281375d47 # 12:59 22+ 0 debugobjects: Scale thresholds with # of CPUs
> git bisect good 0cad93c3453fc9d11692d3924ac3a520821bbf64 # 14:11 22+ 0 debugobjects: Improve variable naming
> # first bad commit: [575260e3f8f8ac72dc0c41a4a20190d1a5f2b887] Merge branch 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect good 1cd4027cfe33390dc3f442aea8e7caeeeaa861a1 # 14:16 66+ 0 Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect good 0cad93c3453fc9d11692d3924ac3a520821bbf64 # 14:21 66+ 2 debugobjects: Improve variable naming
> # extra tests on HEAD of linux-review/Ming-Lei/MAINTAINERS-update-firmware-loader-entry/20170223-095208
> git bisect bad e9a88fe6c1f018d34f582d59734f1e7da31ef9cd # 14:21 0- 21 MAINTAINERS: update firmware loader entry
> # extra tests on tree/branch linus/master
> git bisect bad f1ef09fde17f9b77ca1435a5b53a28b203afb81c # 14:40 0- 39 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
> # extra tests on tree/branch linux-next/master
> git bisect bad 27fde840c0aaca31213844b8bc914281cdb101fa # 14:45 0- 26 Add linux-next specific files for 20170223
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/lkp Intel Corporation
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