linux-kernel - ca54678efb: BUG: kernel hang in boot stage

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Date:   Sun, 16 Oct 2016 05:35:34 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>
Cc:     lkp@...org, Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>,
        james.h.cownie@...el.com, lukasz.daniluk@...el.com,
        linux-kernel@...r.kernel.org, dave.hansen@...ux.intel.com,
        bp@...e.de, x86@...nel.org, hpa@...or.com, mingo@...hat.com,
        tglx@...utronix.de
Subject: ca54678efb: BUG: kernel hang in boot stage

FYI, we noticed the following commit:

https://github.com/0day-ci/linux Grzegorz-Andrejczuk/Enabling-Ring-3-MONITOR-MWAIT-feature-for-Knights-Landing/20161012-202414
commit ca54678efb1a9e8b0ff83fb488175103d6616a81 ("Add R3MWAIT to CPU features")

in testcase: boot

on test machine: qemu-system-i386 -enable-kvm -cpu Haswell,+smep,+smap -m 360M

caused below changes:


+-------------------------------------------------+------------+------------+
|                                                 | d19ea2b4b4 | ca54678efb |
+-------------------------------------------------+------------+------------+
| boot_successes                                  | 4          | 0          |
| boot_failures                                   | 2          | 30         |
| BUG:kernel_reboot-without-warning_in_test_stage | 2          |            |
| BUG:kernel_hang_in_boot_stage                   | 0          | 30         |
+-------------------------------------------------+------------+------------+



Booting the kernel.

Elapsed time: 510
BUG: kernel hang in boot stage
Linux version 4.8.0-rc8-00004-gca54678 #1
Command line: ip=::::vm-vp-quantal-i386-24::dhcp root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-vp-quantal-i386-24/boot-1-quantal-core-i386.cgz-ca54678efb1a9e8b0ff83fb488175103d6616a81-20161016-56681-1pl9mhj-0.yaml ARCH=i386 kconfig=i386-randconfig-x0-10131534+CONFIG_DEBUG_INFO_REDUCED branch=linux-devel/devel-spot-201610131309 commit=ca54678efb1a9e8b0ff83fb488175103d6616a81 BOOT_IMAGE=/pkg/linux/i386-randconfig-x0-10131534+CONFIG_DEBUG_INFO_REDUCED/gcc-6/ca54678efb1a9e8b0ff83fb488175103d6616a81/vmlinuz-4.8.0-rc8-00004-gca54678 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-vp-quantal-i386/quantal-core-i386.cgz/i386-randconfig-x0-10131534+CONFIG_DEBUG_INFO_REDUCED/gcc-6/ca54678efb1a9e8b0ff83fb488175103d6616a81/0 LKP_SERVER=inn 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 load_ramdisk=2 prompt_ramdisk=0 systemd.log_level=err ignore_loglevel earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal rw drbd.minor_count=8






Thanks,
Kernel Test Robot

View attachment "config-4.8.0-rc8-00004-gca54678" of type "text/plain" (87533 bytes)

View attachment "job-script" of type "text/plain" (3894 bytes)

Download attachment "dmesg.xz" of type "application/octet-stream" (1276 bytes)