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Date:   Fri, 12 Apr 2019 11:18:09 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Waiman Long <longman@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Will Deacon <will.deacon@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>, tipbuild@...or.com, lkp@...org
Subject: [locking/rwsem] f03c360396: WARNING:at_init/main.c:#start_kernel

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

commit: f03c36039664fc53ebf6d8322c46aaf8e373f70c ("locking/rwsem: Merge owner into count on x86-64")
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git WIP.locking/core

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 8G

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


+----------------------------------------------------+------------+------------+
|                                                    | 1878939138 | f03c360396 |
+----------------------------------------------------+------------+------------+
| boot_successes                                     | 0          | 0          |
| boot_failures                                      | 4          | 9          |
| BUG:kernel_hang_in_boot-around-mounting-root_stage | 3          | 5          |
| BUG:kernel_reboot-without-warning_in_test_stage    | 1          |            |
| WARNING:at_init/main.c:#start_kernel               | 0          | 9          |
| RIP:start_kernel                                   | 0          | 9          |
+----------------------------------------------------+------------+------------+



[    4.777899] WARNING: CPU: 0 PID: 0 at init/main.c:663 start_kernel+0x366/0x512
[    4.777906] Modules linked in:
[    4.777920] CPU: 0 PID: 0 Comm: swapper Not tainted 5.1.0-rc4-00083-gf03c360 #2
[    4.777929] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[    4.777943] RIP: 0010:start_kernel+0x366/0x512
[    4.777957] Code: 01 00 e8 f2 85 00 00 e8 84 cd 01 00 e8 0e 48 02 00 e8 34 2b 8b fe 9c 58 0f ba e0 09 73 0e 48 c7 c7 e0 08 a0 99 e8 2c 91 bd fd <0f> 0b c6 05 4b c0 b9 ff 00 e8 64 d2 cb fd fb e8 c9 ca 02 00 e8 87
[    4.777966] RSP: 0000:ffffffff9a207ed8 EFLAGS: 00010282
[    4.777977] RAX: dffffc0000000008 RBX: ffff8881f699cb00 RCX: ffffffff9896f4d5
[    4.777986] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff988f0c4b
[    4.777995] RBP: 1ffffffff3440fdb R08: fffffbfff35085ae R09: fffffbfff35085ae
[    4.778003] R10: 0000000000000001 R11: fffffbfff35085ad R12: ffffffff9ad812e0
[    4.778011] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[    4.778020] FS:  0000000000000000(0000) GS:ffffffff9a2a7000(0000) knlGS:0000000000000000
[    4.778029] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.778037] CR2: 00000000ffffffff CR3: 00000001e884c000 CR4: 00000000000006b0
[    4.778046] Call Trace:
[    4.778063]  ? mem_encrypt_init+0x1/0x1
[    4.778080]  ? memcpy_orig+0x16/0x110
[    4.778093]  secondary_startup_64+0xb6/0xc0
[    4.778116] random: get_random_bytes called from print_oops_end_marker+0x34/0x47 with crng_init=0
[    4.778128] ---[ end trace 8182026d66b2a4ad ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.1.0-rc4-00083-gf03c360 .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,
Rong Chen


View attachment "config-5.1.0-rc4-00083-gf03c360" of type "text/plain" (127984 bytes)

View attachment "job-script" of type "text/plain" (4576 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (8472 bytes)

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