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Date: Wed, 10 Dec 2014 15:26:45 -0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Michael Turquette <mturquette@...erred.io>, LKP <lkp@...org>,
linux-kernel@...r.kernel.org
Subject: [sched] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/common.c:1439
warn_pre_alternatives()
Hi Dietmar,
FYI, here is another bisect result.
https://git.linaro.org/people/mturquette/linux.git eas-next
commit 1fadb581b0be9420b143e43ff2f4a07ea7e45f6c
Author: Dietmar Eggemann <dietmar.eggemann@....com>
AuthorDate: Tue Dec 2 14:06:24 2014 +0000
Commit: Michael Turquette <mturquette@...erred.io>
CommitDate: Tue Dec 9 20:33:17 2014 -0800
sched: Make usage and load tracking cpu scale-invariant
Besides the existing frequency scale-invariance correction factor, apply
cpu scale-invariance correction factor to usage and load tracking.
Cpu scale-invariance takes cpu performance deviations due to
micro-architectural differences (i.e. instructions per seconds) between
cpus in HMP systems (e.g. big.LITTLE) and differences in the frequency
value of the highest OPP between cpus in SMP systems into consideration.
Each segment of the sched_avg::{running_avg_sum, runnable_avg_sum}
geometric series is now scaled by the cpu performance factor too so the
sched_avg::{utilization_avg_contrib, load_avg_contrib} of each entity will
be invariant from the particular cpu of the HMP/SMP system it is gathered
on. As a result, cfs_rq::runnable_load_avg which is the sum of
sched_avg::load_avg_contrib, becomes cpu scale-invariant too.
So the {usage, load} level that is returned by {get_cpu_usage,
weighted_cpuload} stays relative to the max cpu performance of the system.
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
===================================================
PARENT COMMIT NOT CLEAN. LOOK OUT FOR WRONG BISECT!
===================================================
Attached dmesg for the parent commit, too, to help confirm whether it is a noise error.
+------------------------------------------------------------------+------------+------------+------------+
| | e754569101 | 1fadb581b0 | 1e7327cb22 |
+------------------------------------------------------------------+------------+------------+------------+
| boot_successes | 0 | 0 | 0 |
| boot_failures | 80 | 20 | 14 |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 80 | | |
| backtrace:lock_torture_stats | 80 | | |
| WARNING:at_arch/x86/kernel/cpu/common.c:#warn_pre_alternatives() | 0 | 19 | 14 |
| BUG:unable_to_handle_kernel | 0 | 19 | 14 |
| Oops | 0 | 19 | 14 |
| RIP:arch_scale_cpu_capacity | 0 | 19 | 14 |
| Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 19 | 14 |
| backtrace:acpi_load_tables | 0 | 19 | 14 |
| backtrace:acpi_early_init | 0 | 19 | 14 |
| BUG:kernel_boot_crashed | 0 | 1 | |
+------------------------------------------------------------------+------------+------------+------------+
[ 0.020000] pid_max: default: 32768 minimum: 301
[ 0.020000] ACPI: Core revision 20140926
[ 0.020006] ------------[ cut here ]------------
[ 0.021391] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/common.c:1439 warn_pre_alternatives+0x2e/0x40()
[ 0.024425] You're using static_cpu_has before alternatives have run!
[ 0.026159] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.18.0-rc2-g1fadb58 #507
[ 0.028350] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 0.029899] 0000000000000009 ffff8800126039f8 ffffffff82d77315 ffff880012603a48
[ 0.030000] 0000000000000009 ffff880012603a38 ffffffff81105674 0000000000000000
[ 0.030000] 0000000000000050 ffffffff83c7de40 0000000000000000 0000000000000060
[ 0.030000] Call Trace:
[ 0.030000] <IRQ> [<ffffffff82d77315>] dump_stack+0xc5/0x175
[ 0.030000] [<ffffffff81105674>] warn_slowpath_common+0xc4/0x100
[ 0.030000] [<ffffffff81105746>] warn_slowpath_fmt+0x56/0x60
[ 0.030000] [<ffffffff81034dde>] warn_pre_alternatives+0x2e/0x40
[ 0.030000] [<ffffffff81092831>] __do_page_fault+0x4f1/0x1060
[ 0.030000] [<ffffffff81093601>] trace_do_page_fault+0xe1/0x450
[ 0.030000] [<ffffffff8190042a>] ? trace_hardirqs_off_thunk+0x3a/0x3f
[ 0.030000] [<ffffffff81083a8f>] do_async_page_fault+0x3f/0x200
[ 0.030000] [<ffffffff82d9a898>] async_page_fault+0x28/0x30
[ 0.030000] [<ffffffff81179edd>] ? arch_scale_cpu_capacity+0xd/0x30
[ 0.030000] [<ffffffff81179f35>] ? contrib_scale_factor+0x35/0x50
[ 0.030000] [<ffffffff8117eff0>] task_tick_fair+0x2b0/0xe50
[ 0.030000] [<ffffffff81170062>] ? sched_clock_cpu+0x212/0x2e0
[ 0.030000] [<ffffffff8116551b>] scheduler_tick+0x7b/0xf0
[ 0.030000] [<ffffffff811ef834>] update_process_times+0xb4/0xe0
[ 0.030000] [<ffffffff8120b14f>] tick_periodic+0xcf/0xe0
[ 0.030000] [<ffffffff8120b762>] tick_handle_periodic+0x32/0x110
[ 0.030000] [<ffffffff8100df9d>] timer_interrupt+0x1d/0x30
[ 0.030000] [<ffffffff811bcec7>] handle_irq_event_percpu+0x147/0x670
[ 0.030000] [<ffffffff82d96a84>] ? _raw_spin_lock_irqsave+0xc4/0x170
[ 0.030000] [<ffffffff811bd441>] handle_irq_event+0x51/0x90
[ 0.030000] [<ffffffff811c4ada>] handle_level_irq+0x1ba/0x240
[ 0.030000] [<ffffffff8100cd1c>] handle_irq+0x7c/0xa0
[ 0.030000] [<ffffffff8100b9c9>] do_IRQ+0x69/0x190
[ 0.030000] [<ffffffff81aad401>] ? acpi_os_create_cache+0x11/0x64
[ 0.030000] [<ffffffff82d99832>] common_interrupt+0x72/0x72
[ 0.030000] <EOI> [<ffffffff8102ce07>] ? save_stack_trace+0x37/0x90
[ 0.030000] [<ffffffff81084b7e>] ? native_restore_fl+0xe/0x20
[ 0.030000] [<ffffffff82d96f37>] _raw_spin_unlock_irqrestore+0xe7/0x150
[ 0.030000] [<ffffffff8137f6cc>] __slab_free+0xcc/0x6b0
[ 0.030000] [<ffffffff8137f853>] ? __slab_free+0x253/0x6b0
[ 0.030000] [<ffffffff8137e801>] ? __slab_alloc+0xdf1/0xf60
[ 0.030000] [<ffffffff813820eb>] kmem_cache_free+0x57b/0x630
[ 0.030000] [<ffffffff81aad4a9>] ? acpi_os_release_object+0x15/0x20
[ 0.030000] [<ffffffff81aad4a9>] acpi_os_release_object+0x15/0x20
[ 0.030000] [<ffffffff81afa9c9>] acpi_ps_free_op+0x5f/0x84
[ 0.030000] [<ffffffff81afaaab>] acpi_ps_delete_parse_tree+0x62/0x10c
[ 0.030000] [<ffffffff81af99f3>] acpi_ps_complete_this_op+0x4dd/0x4f3
[ 0.030000] [<ffffffff81af8c67>] acpi_ps_complete_op+0x2f/0x461
[ 0.030000] [<ffffffff81af845d>] acpi_ps_parse_loop+0xd5a/0xdcb
[ 0.030000] [<ffffffff81af9ccd>] acpi_ps_parse_aml+0x167/0x6e6
[ 0.030000] [<ffffffff81aef51c>] acpi_ns_one_complete_parse+0x2ad/0x2da
[ 0.030000] [<ffffffff81aef570>] acpi_ns_parse_table+0x27/0x85
[ 0.030000] [<ffffffff81aee112>] acpi_ns_load_table+0xcb/0x171
[ 0.030000] [<ffffffff84d50199>] acpi_load_tables+0x137/0x2cb
[ 0.030000] [<ffffffff84d4dcd6>] acpi_early_init+0x149/0x295
[ 0.030000] [<ffffffff84cc9aad>] start_kernel+0x737/0x80f
[ 0.030000] [<ffffffff84cc8120>] ? early_idt_handlers+0x120/0x120
[ 0.030000] [<ffffffff84cc866c>] x86_64_start_reservations+0x64/0x6d
[ 0.030000] [<ffffffff84cc8862>] x86_64_start_kernel+0x1ed/0x203
[ 0.030000] ---[ end trace 99ec80f6857ad667 ]---
[ 0.030000] ------------[ cut here ]------------
git bisect start 1e7327cb22aa5bbd32c80399d05f7668ea5b6ad7 b2776bf7149bddd1f4161f14f79520f17fc1d71d --
git bisect bad 0673f0768824bc10d94c12c74af0c48fe937f0de # 16:00 0- 20 Merge 'clk/eas-next' into devel-lkp-nhm1-smoke-201412101539
git bisect good d6e8730ed98528a493522074b36ace58a95a9b97 # 16:13 20+ 20 0day base guard for 'devel-lkp-nhm1-smoke-201412101539'
git bisect good c1a1272dcf10f1bea314226c76245604fbf91c87 # 16:22 20+ 20 sched: updated comments of CLONE_NEWUTS and CLONE_NEWIPC
git bisect good 7c2684baf9042237fa3f72c9f230637911fe9b53 # 16:35 20+ 20 sched: energy_model: simple cpu frequency scaling policy
git bisect good 123c1de3f5f485b44b1b84c50b40cbafe1e379d6 # 16:47 20+ 20 sched: add ftrace for io latency tracking
git bisect bad 318e8cc222050c8c542c7471224fe3ba1ac18062 # 16:53 1- 20 arm: Frequency invariant scheduler load-tracking support
git bisect good b9ed965defe8f8ee2e57e0a9372c70b883a4ea3f # 17:11 20+ 20 Merge remote-tracking branch 'eas-next/eas-next' into sched/cpuidle/eas-next
git bisect bad 1fadb581b0be9420b143e43ff2f4a07ea7e45f6c # 17:19 1- 20 sched: Make usage and load tracking cpu scale-invariant
git bisect good e754569101f392e1924d8ce6f087ea4cfad91d69 # 17:34 20+ 20 sched: Make load tracking frequency scale-invariant
# first bad commit: [1fadb581b0be9420b143e43ff2f4a07ea7e45f6c] sched: Make usage and load tracking cpu scale-invariant
git bisect good e754569101f392e1924d8ce6f087ea4cfad91d69 # 17:38 60+ 80 sched: Make load tracking frequency scale-invariant
# extra tests on HEAD of linux-devel/devel-lkp-nhm1-smoke-201412101539
git bisect bad 1e7327cb22aa5bbd32c80399d05f7668ea5b6ad7 # 17:38 0- 14 0day head guard for 'devel-lkp-nhm1-smoke-201412101539'
# extra tests on tree/branch clk/eas-next
git bisect bad 67cc03886394320689d30d65d65b386756d47e39 # 17:51 1- 11 sched: Include blocked load in weighted_cpuload
# extra tests on tree/branch linus/master
git bisect good 86c6a2fddf0b89b494c7616f2c06cf915c4bff01 # 17:57 60+ 64 Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
# extra tests on tree/branch next/master
git bisect good 12fd07251e19050ca979d9ce5d4b6bcb41dc00e9 # 18:09 60+ 60 Add linux-next specific files for 20141210
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64
-enable-kvm
-cpu Haswell,+smep,+smap
-kernel $kernel
-m 320
-smp 2
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-quantal-kbuild-7:20141210171614:x86_64-randconfig-n0-12101521:3.18.0-rc2-g1fadb58:507" of type "text/plain" (43392 bytes)
View attachment "dmesg-quantal-client1-11:20141210173336:x86_64-randconfig-n0-12101521:3.18.0-rc2-ge754569:509" of type "text/plain" (132373 bytes)
View attachment "config-3.18.0-rc2-g1fadb58" of type "text/plain" (79832 bytes)
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