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Message-ID: <55254834.7090300@ezchip.com>
Date: Wed, 8 Apr 2015 11:24:36 -0400
From: Chris Metcalf <cmetcalf@...hip.com>
To: Fengguang Wu <fengguang.wu@...el.com>
CC: LKP <lkp@...org>, <linux-kernel@...r.kernel.org>
Subject: Re: [watchdog] WARNING: CPU: 0 PID: 1 at mm/memblock.c:1151 memblock_virt_alloc_internal()
Thanks! Already fixed in the next version, which is on LKML waiting to be
picked up; the old version has been removed from the tile tree.
On 04/07/2015 11:30 PM, Fengguang Wu wrote:
> Greetings,
>
> 0day kernel testing robot got the below dmesg and the first bad commit is
>
> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
>
> commit e164ade07b215cc33da6831734140f0aa0615d0a
> Author: Chris Metcalf <cmetcalf@...hip.com>
> AuthorDate: Thu Apr 2 13:25:32 2015 -0400
> Commit: Chris Metcalf <cmetcalf@...hip.com>
> CommitDate: Mon Apr 6 12:35:02 2015 -0400
>
> watchdog: add watchdog_exclude sysctl to assist nohz
>
> Change the default behavior of watchdog so it only runs on the
> housekeeping cores when nohz_full is enabled at build and boot time.
>
> Allow modifying the set of cores the watchdog is currently running
> on with a new kernel.watchdog_exclude sysctl.
>
> Signed-off-by: Chris Metcalf <cmetcalf@...hip.com>
>
> +----------------------------------------------------------+------------+------------+---------------+
> | | a578fc8f8d | e164ade07b | next-20150407 |
> +----------------------------------------------------------+------------+------------+---------------+
> | boot_successes | 0 | 0 | 0 |
> | boot_failures | 80 | 20 | 12 |
> | WARNING:at_lib/debugobjects.c:#__debug_object_init() | 80 | | |
> | page_allocation_failure:order:#,mode | 80 | | |
> | Out_of_memory:Kill_process | 33 | | |
> | backtrace:__debug_object_init | 80 | | |
> | backtrace:warn_slowpath_null | 80 | | |
> | backtrace:debug_object_init | 80 | | |
> | backtrace:__init_work | 80 | | |
> | backtrace:rhashtable_init | 80 | | |
> | backtrace:test_rht_init | 80 | | |
> | backtrace:kernel_init_freeable | 80 | 20 | 12 |
> | backtrace:btrfs_test_extent_io | 80 | | |
> | backtrace:init_btrfs_fs | 80 | | |
> | WARNING:at_mm/memblock.c:#memblock_virt_alloc_internal() | 0 | 20 | 12 |
> | BUG:KASan:user-memory-access_on_address(null) | 0 | 20 | 12 |
> | BUG:unable_to_handle_kernel | 0 | 20 | 12 |
> | Oops | 0 | 20 | 12 |
> | RIP:__bitmap_empty | 0 | 20 | |
> | Kernel_panic-not_syncing:Fatal_exception | 0 | 20 | 12 |
> | backtrace:alloc_bootmem_cpumask_var | 0 | 20 | 12 |
> | backtrace:lockup_detector_init | 0 | 20 | 12 |
> | backtrace:__bitmap_empty | 0 | 20 | |
> | RIP:find_first_bit | 0 | 0 | 12 |
> | backtrace:find_first_bit | 0 | 0 | 12 |
> +----------------------------------------------------------+------------+------------+---------------+
>
> [ 0.177042] smpboot: CPU0: Intel Common KVM processor (fam: 0f, model: 06, stepping: 01)
> [ 0.179108] Performance Events: unsupported Netburst CPU model 6 no PMU driver, software events only.
> [ 0.187261] ------------[ cut here ]------------
> [ 0.188011] WARNING: CPU: 0 PID: 1 at mm/memblock.c:1151 memblock_virt_alloc_internal+0x7e/0x149()
> [ 0.189008] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.0.0-rc1-00012-ge164ade #11
> [ 0.190005] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
> [ 0.191005] ffffffff82459271 ffff88000db9fd98 ffffffff81ff9f0e 0000000080000000
> [ 0.193004] 0000000000000000 ffff88000db9fde8 ffffffff8112a2b8 fffffbfff04e2930
> [ 0.195004] ffffffff82a3ba79 ffff88000db9fdd8 0000000000000000 0000000000000400
> [ 0.197004] Call Trace:
> [ 0.198011] [<ffffffff81ff9f0e>] dump_stack+0x4f/0x7b
> [ 0.199009] [<ffffffff8112a2b8>] warn_slowpath_common+0xba/0xd8
> [ 0.200009] [<ffffffff82a3ba79>] ? memblock_virt_alloc_internal+0x7e/0x149
> [ 0.201008] [<ffffffff8112a398>] warn_slowpath_null+0x1a/0x1c
> [ 0.202008] [<ffffffff82a3ba79>] memblock_virt_alloc_internal+0x7e/0x149
> [ 0.203008] [<ffffffff82a3bcb1>] memblock_virt_alloc_try_nid+0x5f/0x9c
> [ 0.204009] [<ffffffff82a54a7c>] alloc_bootmem_cpumask_var+0x1e/0x31
> [ 0.205008] [<ffffffff82a3064a>] lockup_detector_init+0x2e/0xf8
> [ 0.206009] [<ffffffff82a054b8>] kernel_init_freeable+0xd0/0x249
> [ 0.207008] [<ffffffff81fefc84>] ? rest_init+0xd5/0xd5
> [ 0.208007] [<ffffffff81fefc95>] kernel_init+0x11/0xef
> [ 0.209007] [<ffffffff81fefc84>] ? rest_init+0xd5/0xd5
> [ 0.210009] [<ffffffff8200cabc>] ret_from_fork+0x7c/0xb0
> [ 0.211008] [<ffffffff81fefc84>] ? rest_init+0xd5/0xd5
> [ 0.212024] ---[ end trace 2aec86b663049736 ]---
> [ 0.213023] ==================================================================
>
> git bisect start 44bf159dfed5558083f97d792cb4bebdbcbf3061 f22e6e847115abc3a0e2ad7bb18d243d42275af1 --
> git bisect bad f2557a9d44457b444ec69b3691fc0c1571ddf087 # 00:55 0- 20 Merge remote-tracking branch 'drm-panel/drm/panel/for-next'
> git bisect bad f01054f7e15e9114def6e7441abf6c37e6fa6f21 # 00:57 0- 20 Merge remote-tracking branch 'tile/master'
> git bisect good e5a6058af54727023a6e1765fd167ca4ae1782eb # 01:01 20+ 20 Merge remote-tracking branch 'samsung/for-next'
> git bisect good 2800a1cd484a2eca221bd09837c47a2485ea0cd1 # 01:08 20+ 20 Merge remote-tracking branch 'm68k/for-next'
> git bisect good a07a71a1637fa160946455268e15b3a3973320fa # 01:18 20+ 20 Merge remote-tracking branch 'parisc-hd/for-next'
> git bisect good 5fbccbbac0e2fb3fcb3564ac40834380866acfa4 # 01:21 20+ 20 Merge remote-tracking branch 'powerpc-mpe/next'
> git bisect good 144523fada84074c56325c63ecb7cb3e672740d7 # 01:24 20+ 20 Merge remote-tracking branch 'fsl/next'
> git bisect good 1e961dafe183e63830e8b973afbb44bdf9e52f2a # 01:27 20+ 20 Merge remote-tracking branch 's390/features'
> git bisect good f46c8d1e94b46ad0b22bd0a9d6d62d64aa9c7926 # 01:32 20+ 20 nohz: add tick_nohz_full_clear_cpus() and _set_cpus() APIs
> git bisect good 16125f97cfdeb4e093e18c59da14eafbb4040786 # 01:36 20+ 20 tile: ftrace: fix function_graph tracer issues
> git bisect good a578fc8f8db52a5832c5e6ff819ff28fb9729789 # 01:39 20+ 20 smpboot: allow excluding cpus from the smpboot threads
> git bisect bad e164ade07b215cc33da6831734140f0aa0615d0a # 01:42 0- 20 watchdog: add watchdog_exclude sysctl to assist nohz
> # first bad commit: [e164ade07b215cc33da6831734140f0aa0615d0a] watchdog: add watchdog_exclude sysctl to assist nohz
> git bisect good a578fc8f8db52a5832c5e6ff819ff28fb9729789 # 01:49 60+ 80 smpboot: allow excluding cpus from the smpboot threads
> # extra tests with DEBUG_INFO
> # extra tests on HEAD of next/master
> git bisect bad 44bf159dfed5558083f97d792cb4bebdbcbf3061 # 01:53 0- 12 Add linux-next specific files for 20150407
> # extra tests on tree/branch next/master
> git bisect bad 44bf159dfed5558083f97d792cb4bebdbcbf3061 # 01:53 0- 12 Add linux-next specific files for 20150407
> # extra tests on tree/branch linus/master
> git bisect good f22e6e847115abc3a0e2ad7bb18d243d42275af1 # 01:56 60+ 82 Linux 4.0-rc7
> # extra tests on tree/branch next/master
> git bisect bad 44bf159dfed5558083f97d792cb4bebdbcbf3061 # 01:56 0- 12 Add linux-next specific files for 20150407
>
>
> This script may reproduce the error.
>
> ----------------------------------------------------------------------------
> #!/bin/bash
>
> kernel=$1
>
> kvm=(
> qemu-system-x86_64
> -enable-kvm
> -cpu kvm64
> -kernel $kernel
> -m 300
> -smp 2
> -device e1000,netdev=net0
> -netdev user,id=net0
> -boot order=nc
> -no-reboot
> -watchdog i6300esb
> -rtc base=localtime
> -serial stdio
> -display none
> -monitor null
> )
>
> append=(
> hung_task_panic=1
> earlyprintk=ttyS0,115200
> rd.udev.log-priority=err
> systemd.log_target=journal
> systemd.log_level=warning
> debug
> apic=debug
> sysrq_always_enabled
> rcupdate.rcu_cpu_stall_timeout=100
> panic=-1
> softlockup_panic=1
> nmi_watchdog=panic
> oops=panic
> load_ramdisk=2
> prompt_ramdisk=0
> console=ttyS0,115200
> console=tty0
> vga=normal
> root=/dev/ram0
> rw
> drbd.minor_count=8
> )
>
> "${kvm[@]}" --append "${append[*]}"
> ----------------------------------------------------------------------------
>
> Thanks,
> Fengguang
--
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com
--
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