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Date: Thu, 4 Jun 2015 12:55:36 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Frederic Weisbecker <fweisbec@...il.com>
Cc: fengguang.wu@...el.com, Ingo Molnar <mingo@...nel.org>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
kpreempt-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
LKP <lkp@...org>
Subject: [sched/preempt] BUG: kernel boot crashed
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 b30f0e3ffedfa52b1d67a302ae5860c49998e5e2
Author: Frederic Weisbecker <fweisbec@...il.com>
AuthorDate: Tue May 12 16:41:49 2015 +0200
Commit: Ingo Molnar <mingo@...nel.org>
CommitDate: Tue May 19 08:39:12 2015 +0200
sched/preempt: Optimize preemption operations on __schedule() callers
__schedule() disables preemption and some of its callers
(the preempt_schedule*() family) also set PREEMPT_ACTIVE.
So we have two preempt_count() modifications that could be performed
at once.
Lets remove the preemption disablement from __schedule() and pull
this responsibility to its callers in order to optimize preempt_count()
operations in a single place.
Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1431441711-29753-5-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
+----------------------------------------------------+------------+------------+------------+
| | 90b62b5129 | b30f0e3ffe | f407a82586 |
+----------------------------------------------------+------------+------------+------------+
| boot_successes | 195 | 0 | 0 |
| boot_failures | 0 | 65 | 100 |
| BUG:kernel_boot_hang | 0 | 58 | 76 |
| BUG:kernel_boot_crashed | 0 | 4 | 18 |
| BUG:unable_to_handle_kernel | 0 | 3 | 6 |
| WARNING:at_lib/kobject.c:#kobject_add_internal() | 0 | 2 | 6 |
| Oops | 0 | 1 | 6 |
| Oops:#[##]PREEMPT_PREEMPT_x_x | 0 | 1 | |
| EIP_is_at_sock_alloc | 0 | 2 | |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 2 | 6 |
| backtrace:platform_device_add | 0 | 2 | 6 |
| backtrace:regulator_dummy_init | 0 | 2 | 6 |
| backtrace:regulator_init | 0 | 2 | 6 |
| backtrace:kernel_init_freeable | 0 | 2 | 6 |
| backtrace:kset_create_and_add | 0 | 2 | 6 |
| backtrace:of_init | 0 | 2 | 6 |
| backtrace:__netlink_kernel_create | 0 | 2 | |
| backtrace:rtnetlink_net_init | 0 | 2 | |
| backtrace:ops_init | 0 | 2 | 6 |
| backtrace:register_pernet_subsys | 0 | 2 | 6 |
| backtrace:rtnetlink_init | 0 | 2 | |
| backtrace:netlink_proto_init | 0 | 2 | 6 |
| WARNING:at_kernel/trace/trace.c:#register_tracer() | 0 | 0 | 1 |
| WARNING:at_fs/sysfs/dir.c:#sysfs_warn_dup() | 0 | 0 | 6 |
| WARNING:at_fs/proc/generic.c:#__proc_create() | 0 | 0 | 6 |
| EIP_is_at_parameq | 0 | 0 | 6 |
| backtrace:__class_register | 0 | 0 | 6 |
| backtrace:cpuidle_add_interface | 0 | 0 | 6 |
| backtrace:cpuidle_init | 0 | 0 | 6 |
| backtrace:proc_mkdir_data | 0 | 0 | 6 |
| backtrace:netfilter_net_init | 0 | 0 | 6 |
| backtrace:netfilter_init | 0 | 0 | 6 |
| backtrace:sock_init | 0 | 0 | 6 |
| backtrace:proc_create_data | 0 | 0 | 6 |
| backtrace:netlink_net_init | 0 | 0 | 6 |
| backtrace:parse_args | 0 | 0 | 6 |
+----------------------------------------------------+------------+------------+------------+
[ 0.132797] clocksource jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 6370867519511994 ns
[ 0.133406] Testing tracer function:
[ 0.133406] Testing tracer function:
BUG: kernel boot crashed
Elapsed time: 10
qemu-system-x86_64 -enable-kvm -cpu kvm64 -kernel /pkg/linux/i386-randconfig-x1-06011148/gcc-4.9/b30f0e3ffedfa52b1d67a302ae5860c49998e5e2/vmlinuz-4.1.0-rc4-00025-gb30f0e3 -append 'hung_task_panic=1 earlyprintk=ttyS0,115200 systemd.log_level=err 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 link=/kbuild-tests/run-queue/kvm/i386-randconfig-x1-06011148/tip:sched:core:b30f0e3ffedfa52b1d67a302ae5860c49998e5e2:bisect-linux-6/.vmlinuz-b30f0e3ffedfa52b1d67a302ae5860c49998e5e2-20150603202622-18-ivb41 branch=tip/sched/core BOOT_IMAGE=/pkg/linux/i386-randconfig-x1-06011148/gcc-4.9/b30f0e3ffedfa52b1d67a302ae5860c49998e5e2/vmlinuz-4.1.0-rc4-00025-gb30f0e3 drbd.minor_count=8' -initrd /osimage/quantal/quantal-core-i386.cgz -m 300 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/vdisk/disk0-quantal-ivb41-47,media=disk,if=virtio -drive file=/fs/vdisk/disk1-quantal-ivb41-47,media=disk,if=virtio -drive file=/fs/vdisk/disk2-quantal-ivb41-47,media=disk,if=virtio -drive file=/fs/vdisk/disk3-quantal-ivb41-47,media=disk,if=virtio -drive file=/fs/vdisk/disk4-quantal-ivb41-47,media=disk,if=virtio -drive file=/fs/vdisk/disk5-quantal-ivb41-47,media=disk,if=virtio -drive file=/fs/vdisk/disk6-quantal-ivb41-47,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-quantal-ivb41-47 -serial file:/dev/shm/kboot/serial-quantal-ivb41-47 -daemonize -display none -monitor null
git bisect start f407a8258610169cd8e975dba7f0b2824562014c 3e0283a53f7d2f2dae7bc4aa7f3104cb5988018f --
git bisect bad 70ffdb9393a7264a069265edded729078dcf0425 # 07:24 2- 3 mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in the handler
git bisect good fa6004ad4528153b699a4d5ce5ea6b33acce74cc # 20:09 65+ 1 ipc/mqueue: Implement lockless pipelined wakeups
git bisect bad b30f0e3ffedfa52b1d67a302ae5860c49998e5e2 # 20:27 1- 3 sched/preempt: Optimize preemption operations on __schedule() callers
git bisect good a22ae718067c233af790b8690b3d8f6190859ead # 20:38 65+ 0 Merge tag 'v4.1-rc4' into sched/core, before applying new patches
git bisect good 2e10e71ce88e3eaccfd09a045ae6ecebe657ba09 # 21:00 65+ 0 sched/preempt: Rearrange a few symbols after headers merge
git bisect good 90b62b5129d5cb50f62f40e684de7a1961e57197 # 21:08 65+ 0 sched/preempt: Rename PREEMPT_CHECK_OFFSET to PREEMPT_DISABLE_OFFSET
# first bad commit: [b30f0e3ffedfa52b1d67a302ae5860c49998e5e2] sched/preempt: Optimize preemption operations on __schedule() callers
git bisect good 90b62b5129d5cb50f62f40e684de7a1961e57197 # 21:11 195+ 0 sched/preempt: Rename PREEMPT_CHECK_OFFSET to PREEMPT_DISABLE_OFFSET
# extra tests on HEAD of tip/sched/core
git bisect bad f407a8258610169cd8e975dba7f0b2824562014c # 21:11 0- 100 Merge branch 'linus' into sched/core, to resolve conflict
# extra tests on tree/branch next/master
# extra tests with first bad commit reverted
# extra tests on tree/branch linus/master
git bisect good 8cd9234c64c584432f6992fe944ca9e46ca8ea76 # 22:01 195+ 0 Merge tag 'please-pull-rusty' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux
# extra tests on tree/branch next/master
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64
-enable-kvm
-cpu kvm64
-kernel $kernel
-m 300
-smp 2
-device e1000,netdev=net0
-netdev user,id=net0
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
systemd.log_level=err
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-quantal-ivb41-47:20150603202642:i386-randconfig-x1-06011148:4.1.0-rc4-00025-gb30f0e3:1" of type "text/plain" (29585 bytes)
View attachment "config-4.1.0-rc4-00025-gb30f0e3" of type "text/plain" (104427 bytes)
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