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Date:   Fri, 12 Apr 2019 10:01:19 -0400
From:   Waiman Long <longman@...hat.com>
To:     kernel test robot <rong.a.chen@...el.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: Re: [locking/rwsem] f03c360396: WARNING:at_init/main.c:#start_kernel

On 04/11/2019 11:18 PM, kernel test robot wrote:
> 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 .configf03c36039664fc53ebf6d8322c46aaf8e373f70c
> 	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
>
I think it was caused by the bug that I forgot to initialize sem->owner
in __init_rwsem() when CONFIG_RWSEM_SPIN_ON_OWNER isn't defined as
pointed out by Peter. That will be fixed in the next version of the
patchset.

Thanks,
Longman

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