Date:   Mon, 27 Nov 2017 10:20:21 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, tipbuild@...or.com,
        lkp@...org
Subject: [lkp-robot] [x86/mm/kaiser]  01a00bfbd7:
 kernel_BUG_at_arch/x86/kernel/mpparse.c


FYI, we noticed the following commit (built with gcc-6):

commit: 01a00bfbd7adce7baf95c54c2250de86a5675308 ("x86/mm/kaiser: Use PCID feature to make user and kernel switches faster")
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git WIP.x86/mm

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 1G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+-----------------------------------------+------------+------------+
|                                         | 332132b268 | 01a00bfbd7 |
+-----------------------------------------+------------+------------+
| boot_successes                          | 10         | 4          |
| boot_failures                           | 0          | 6          |
| kernel_BUG_at_arch/x86/kernel/mpparse.c | 0          | 6          |
| PANIC:early_exception                   | 0          | 6          |
| RIP:default_get_smp_config              | 0          | 6          |
+-----------------------------------------+------------+------------+



[    0.000000] kernel BUG at arch/x86/kernel/mpparse.c:559!
PANIC: early exception 0x06 IP 10:ffffffff82aeaf68 error 0 cr2 0xffff880032fff000
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.14.0-01253-g01a00bfb #1
[    0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[    0.000000] task: ffffffff8221fc40 task.stack: ffffffff82200000
[    0.000000] RIP: 0010:default_get_smp_config+0x627/0x6b6
[    0.000000] RSP: 0000:ffffffff82203e08 EFLAGS: 00010002 ORIG_RAX: 0000000000000000
[    0.000000] RAX: 0000000000000027 RBX: 000000003ff7ec00 RCX: 0000000000000000
[    0.000000] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    0.000000] RBP: 000000003ffe0000 R08: ffffffff8221fc40 R09: 0000000000000001
[    0.000000] R10: ffffffff82203d88 R11: ffffffff8389778c R12: ffff88003ffdfc58
[    0.000000] R13: ffffffffff200a80 R14: 0000000000000000 R15: 0000000000000000
[    0.000000] FS:  0000000000000000(0000) GS:ffffffff82274000(0000) knlGS:0000000000000000
[    0.000000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.000000] CR2: ffff880032fff000 CR3: 0000000002218000 CR4: 00000000000606b0
[    0.000000] Call Trace:
[    0.000000]  ? early_memunmap+0xc/0x14
[    0.000000]  ? sfi_unmap_memory+0x3b/0x43
[    0.000000]  ? sfi_init+0x188/0x2a9
[    0.000000]  ? setup_arch+0xfc5/0x109b
[    0.000000]  ? printk+0x54/0x77
[    0.000000]  ? start_kernel+0xad/0x810
[    0.000000]  ? copy_bootdata+0x29/0x132
[    0.000000]  ? x86_64_start_reservations+0x42/0x4a
[    0.000000]  ? x86_64_start_kernel+0xac/0xb5
[    0.000000]  ? secondary_startup_64+0xa5/0xb0
[    0.000000] Code: 8e 14 00 85 db 74 34 be 10 00 00 00 4c 89 ef 48 ff 05 3d 8e 14 00 e8 82 72 01 00 48 ff 05 39 8e 14 00 eb 72 48 ff 05 18 8e 14 00 <0f> 0b 48 ff 05 2f 8e 14 00 48 ff 05 30 8e 14 00 45 85 f6 75 20 

Elapsed time: 10

#!/bin/bash

# To reproduce,
# 1) save job-script and this script (both are attached in 0day report email)
# 2) run this script with your compiled kernel and optional env $INSTALL_MOD_PATH

kernel=$1

initrds=(
	/osimage/debian/debian-x86_64-2016-08-31.cgz
	/lkp/lkp/lkp-x86_64.cgz
	/osimage/deps/debian-x86_64-2016-08-31.cgz/lkp_2017-08-01.cgz
	/osimage/deps/debian-x86_64-2016-08-31.cgz/rsync-rootfs_2016-11-15.cgz
	/osimage/deps/debian-x86_64-2016-08-31.cgz/run-ipconfig_2016-11-15.cgz
)

HTTP_PREFIX=https://github.com/0day-ci/lkp-qemu/raw/master
wget --timestamping "${initrds[@]/#/$HTTP_PREFIX}"

{
	cat "${initrds[@]//*\//}"
	[[ $INSTALL_MOD_PATH ]] && (
		cd "$INSTALL_MOD_PATH"
		find lib | cpio -o -H newc --quiet | gzip
	)
	echo  job-script | cpio -o -H newc --quiet | gzip
} > initrd.img

kvm=(
	qemu-system-x86_64
	-enable-kvm
	-cpu host
	-kernel $kernel
	-initrd initrd.img
	-m 1024
	-smp 2
	-device e1000,netdev=net0
	-netdev user,id=net0
	-boot order=nc
	-no-reboot
	-watchdog i6300esb
	-watchdog-action debug
	-rtc base=localtime
	-serial stdio
	-display none
	-monitor null
)

append=(
	ip=::::vm-lkp-hsw01-1G-5::dhcp
	root=/dev/ram0
	user=lkp
	job=/job-script
	ARCH=x86_64
	kconfig=x86_64-randconfig-r0-11271738
	branch=linux-devel/devel-catchup-201711271924
	commit=01a00bfbd7adce7baf95c54c2250de86a5675308
	BOOT_IMAGE=/pkg/linux/x86_64-randconfig-r0-11271738/gcc-6/01a00bfbd7adce7baf95c54c2250de86a5675308/vmlinuz-4.14.0-01253-g01a00bfb
	max_uptime=600
	RESULT_ROOT=/result/boot/1/vm-lkp-hsw01-1G/debian-x86_64-2016-08-31.cgz/x86_64-randconfig-r0-11271738/gcc-6/01a00bfbd7adce7baf95c54c2250de86a5675308/0
	result_service=tmpfs
	debug
	apic=debug
	sysrq_always_enabled
	rcupdate.rcu_cpu_stall_timeout=100
	net.ifnames=0
	printk.devkmsg=on
	panic=-1
	softlockup_panic=1
	nmi_watchdog=panic
	oops=panic


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong

View attachment "config-4.14.0-01253-g01a00bfb" of type "text/plain" (119382 bytes)

View attachment "job-script" of type "text/plain" (4273 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (3388 bytes)

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