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Date: Tue, 6 Jan 2015 15:06:11 -0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Yao Dongdong <yaodongdong@...wei.com>
Cc: Peter Zijlstra <peterz@...radead.org>, LKP <lkp@...org>,
linux-kernel@...r.kernel.org
Subject: [sched/core] WARNING: CPU: 0 PID: 0 at
arch/x86/kernel/cpu/common.c:1431 warn_pre_alternatives()
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core
commit bb82635917a34bfb73b837b2ce34f59e08b3930b
Author: Yao Dongdong <yaodongdong@...wei.com>
AuthorDate: Mon Dec 29 14:41:43 2014 +0800
Commit: Peter Zijlstra <peterz@...radead.org>
CommitDate: Tue Jan 6 13:53:08 2015 +0100
sched/core: remove check of p->sched_class
Search all usage of p->sched_class in sched/core.c, no one check it
before use, so it seems that every task must belong to one sched_class.
Cc: <mingo@...hat.com>
Cc: <peterz@...radead.org>
Signed-off-by: Yao Dongdong <yaodongdong@...wei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1419835303-28958-1-git-send-email-yaodongdong@huawei.com
+------------------------------------------------------------------+------------+------------+------------+
| | 8f121c2c3f | bb82635917 | 13cbadbc55 |
+------------------------------------------------------------------+------------+------------+------------+
| boot_successes | 60 | 0 | 0 |
| boot_failures | 0 | 20 | 12 |
| WARNING:at_arch/x86/kernel/cpu/common.c:#warn_pre_alternatives() | 0 | 20 | 12 |
| BUG:unable_to_handle_kernel | 0 | 20 | 12 |
| Oops | 0 | 20 | 12 |
| RIP:do_set_cpus_allowed | 0 | 20 | 12 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 20 | 12 |
| backtrace:async_page_fault | 0 | 20 | 12 |
| backtrace:init_idle | 0 | 20 | 12 |
| backtrace:sched_init | 0 | 20 | 12 |
+------------------------------------------------------------------+------------+------------+------------+
[ 0.000000] Memory: 261516K/327160K available (4837K kernel code, 1692K rwdata, 2680K rodata, 2800K init, 15584K bss, 65644K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/common.c:1431 warn_pre_alternatives+0x1e/0x20()
[ 0.000000] You're using static_cpu_has before alternatives have run!
[ 0.000000] Modules linked in:
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.19.0-rc2-gbb82635 #20
[ 0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[ 0.000000] 0000000000000009 ffffffff81a03bc8 ffffffff814ada0f ffffffff81a12580
[ 0.000000] ffffffff81a03c18 ffffffff81a03c08 ffffffff81090381 ffffffff81601ac0
[ 0.000000] ffffffff81010178 ffffffff81a03e08 0000000000000068 0000000000000000
[ 0.000000] Call Trace:
[ 0.000000] [<ffffffff814ada0f>] dump_stack+0x4c/0x6e
[ 0.000000] [<ffffffff81090381>] warn_slowpath_common+0x97/0xb1
[ 0.000000] [<ffffffff81010178>] ? warn_pre_alternatives+0x1e/0x20
[ 0.000000] [<ffffffff810903dc>] warn_slowpath_fmt+0x41/0x43
[ 0.000000] [<ffffffff814b6307>] ? native_iret+0x7/0x7
[ 0.000000] [<ffffffff81010178>] warn_pre_alternatives+0x1e/0x20
[ 0.000000] [<ffffffff810314b4>] __do_page_fault+0x13f/0x51c
[ 0.000000] [<ffffffff8100e86d>] ? save_stack_trace+0x27/0x43
[ 0.000000] [<ffffffff810c3712>] ? save_trace+0x3c/0x9d
[ 0.000000] [<ffffffff810c5b6b>] ? mark_lock+0x49e/0x5aa
[ 0.000000] [<ffffffff810b4f57>] ? sched_clock_cpu+0x12/0xbc
[ 0.000000] [<ffffffff810c7f03>] ? __lock_acquire+0x820/0x1bf2
[ 0.000000] [<ffffffff810318c7>] do_page_fault+0x36/0x64
[ 0.000000] [<ffffffff8102c716>] do_async_page_fault+0x2d/0x97
[ 0.000000] [<ffffffff814b6e18>] async_page_fault+0x28/0x30
[ 0.000000] [<ffffffff810b2082>] ? do_set_cpus_allowed+0x11/0x56
[ 0.000000] [<ffffffff8102ca9f>] ? kvm_clock_read+0x25/0x37
[ 0.000000] [<ffffffff810b26f5>] init_idle+0x72/0x1b7
[ 0.000000] [<ffffffff81d93a48>] sched_init+0x319/0x389
[ 0.000000] [<ffffffff81d7cce4>] start_kernel+0x238/0x433
[ 0.000000] [<ffffffff81d7c120>] ? early_idt_handlers+0x120/0x120
[ 0.000000] [<ffffffff81d7c4a2>] x86_64_start_reservations+0x2a/0x2c
[ 0.000000] [<ffffffff81d7c597>] x86_64_start_kernel+0xf3/0x102
[ 0.000000] ---[ end trace 16da607dead22108 ]---
[ 0.000000] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
git bisect start 13cbadbc55d04c7f902c2ee5b0560696dadb7ccf b1940cd21c0f4abdce101253e860feff547291b0 --
git bisect bad bd916ec18e4be73b1e1874704eb017a35022186e # 23:08 0- 20 Merge 'amirv/for-upstream' into devel-athens-smoke-201501062225
git bisect bad 5bab749367f003a08ab1a9ab60710eaef00f145c # 23:15 0- 10 Merge 'peterz-queue/sched/core' into devel-athens-smoke-201501062225
git bisect good 54e2ef65748fffd6aaff6b7712e32ba6328f1d1f # 23:26 20+ 0 Merge 'peterz-queue/locking/urgent' into devel-athens-smoke-201501062225
git bisect good 604da8d78c39cb3ddeb0b7e93a9ee7d551f0760f # 23:34 20+ 0 Merge 'peterz-queue/perf/core' into devel-athens-smoke-201501062225
git bisect good e29bf0e70103ff7e7c50a0ed204c0424825cbc11 # 23:41 20+ 0 Merge 'peterz-queue/perf/urgent' into devel-athens-smoke-201501062225
git bisect good bc55ee242867b7fe61d64af0ff2beddc0c9f6f00 # 23:47 20+ 0 sched: Fix potential call to __ffs(0) in sched_show_task()
git bisect bad bb82635917a34bfb73b837b2ce34f59e08b3930b # 23:49 0- 20 sched/core: remove check of p->sched_class
git bisect good 8f121c2c3fff740ecb97ab1ff1a8aff8a8104989 # 23:52 20+ 0 sched/fair: Fix sched_entity::avg::decay_count initialization
# first bad commit: [bb82635917a34bfb73b837b2ce34f59e08b3930b] sched/core: remove check of p->sched_class
git bisect good 8f121c2c3fff740ecb97ab1ff1a8aff8a8104989 # 23:54 60+ 0 sched/fair: Fix sched_entity::avg::decay_count initialization
# extra tests with DEBUG_INFO
git bisect bad bb82635917a34bfb73b837b2ce34f59e08b3930b # 23:59 0- 60 sched/core: remove check of p->sched_class
# extra tests on HEAD of linux-devel/devel-athens-smoke-201501062225
git bisect bad 13cbadbc55d04c7f902c2ee5b0560696dadb7ccf # 23:59 0- 12 0day head guard for 'devel-athens-smoke-201501062225'
# extra tests on tree/branch peterz-queue/sched/core
git bisect bad bb82635917a34bfb73b837b2ce34f59e08b3930b # 23:59 0- 20 sched/core: remove check of p->sched_class
# extra tests on tree/branch linus/master
git bisect good b1940cd21c0f4abdce101253e860feff547291b0 # 00:01 60+ 0 Linux 3.19-rc3
# extra tests on tree/branch next/master
git bisect good dc0bee272d5803ff1a0f7cf71748cec66fd9cf58 # 00:09 60+ 0 Add linux-next specific files for 20150106
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64
-cpu kvm64
-enable-kvm
-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-ivb41-87:20150106234803:x86_64-randconfig-a0-01031533:3.19.0-rc2-gbb82635:20" of type "text/plain" (16431 bytes)
View attachment "config-3.19.0-rc2-gbb82635" of type "text/plain" (86011 bytes)
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