linux-kernel - [function_graph] 02519fa3c4: BUG:kernel_reboot-without-warning_in_early-boot_stage,last_printk:early_console_in_setup

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Date:   Mon, 29 Apr 2019 15:56:29 +0800
From:   kernel test robot <lkp@...el.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [function_graph] 02519fa3c4:
 BUG:kernel_reboot-without-warning_in_early-boot_stage,last_printk:early_console_in_setup_code

FYI, we noticed the following commit (built with gcc-7):

commit: 02519fa3c43164aa8ee0ebbe1b464a568130a36f ("function_graph: Use a ftrace_graph_ret_stub() for return")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: trinity
with following parameters:

	runtime: 300s

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


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

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


+-----------------------------------------------------------------------------------------------+------------+------------+
|                                                                                               | 52fde6e70c | 02519fa3c4 |
+-----------------------------------------------------------------------------------------------+------------+------------+
| boot_successes                                                                                | 4          | 0          |
| boot_failures                                                                                 | 0          | 4          |
| BUG:kernel_reboot-without-warning_in_early-boot_stage,last_printk:early_console_in_setup_code | 0          | 4          |
+-----------------------------------------------------------------------------------------------+------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp@...el.com>


early console in setup code
BUG: kernel reboot-without-warning in early-boot stage, last printk: early console in setup code
Linux version 5.1.0-rc3-00023-g02519fa #1
Command line: ip=::::vm-snb-quantal-ia32-804::dhcp root=/dev/ram0 user=lkp job=/lkp/jobs/scheduled/vm-snb-quantal-ia32-804/trinity-300s-quantal-core-i386-2019-04-26.cgz-02519fa3c43-20190429-62375-116iczn-1.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s3-04261012 branch=linux-devel/devel-hourly-2019042607 commit=02519fa3c43164aa8ee0ebbe1b464a568130a36f BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s3-04261012/gcc-7/02519fa3c43164aa8ee0ebbe1b464a568130a36f/vmlinuz-5.1.0-rc3-00023-g02519fa max_uptime=1500 RESULT_ROOT=/result/trinity/300s/vm-snb-quantal-ia32/quantal-core-i386-2019-04-26.cgz/x86_64-randconfig-s3-04261012/gcc-7/02519fa3c43164aa8ee0ebbe1b464a568130a36f/3 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 drbd.minor_count=8 systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 console=ttyS0,115200 vga=normal rw rcuperf.shutdown=0

Elapsed time: 30



To reproduce:

        # build kernel
	cd linux
	cp config-5.1.0-rc3-00023-g02519fa .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage


        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,
lkp


View attachment "config-5.1.0-rc3-00023-g02519fa" of type "text/plain" (113530 bytes)

View attachment "job-script" of type "text/plain" (4274 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (1160 bytes)