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Date:   Mon, 24 Aug 2020 08:29:20 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: [rcuperf] c02cb02f8f: error:#[##]

Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: c02cb02f8f59b8d26a0cc0352d2a2fa4e55073df ("rcuperf: Change rcuperf to rcuscale")
https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git rcu/next


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-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

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


+------------------------------------------+------------+------------+
|                                          | 1b1d8bf165 | c02cb02f8f |
+------------------------------------------+------------+------------+
| boot_successes                           | 4          | 0          |
| boot_failures                            | 0          | 8          |
| error:#[##]                              | 0          | 8          |
| EIP:main_func                            | 0          | 8          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 8          |
+------------------------------------------+------------+------------+


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


[   10.892130] igt_debug 0x0000000000000a00-0x0000000000000e00: 1024: used
[   10.892626] igt_debug 0x0000000000000e00-0x0000000000001000: 512: free
[   10.893115] igt_debug total: 4096, used 2048 free 2048
[   20.901339] rcu-ref-scale: Experiment #0 (Format: <THREAD-NUM>:<Total loop time in ns>)
[   20.901339] 
[   20.902931] divide_error: 0000 [#1] PREEMPT
[   20.903184] CPU: 0 PID: 124 Comm: main_func Not tainted 5.9.0-rc1-00125-gc02cb02f8f59b #1
[   20.903664] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[   20.904156] EIP: main_func+0x1f9/0x2d8
[   20.904381] Code: c8 c2 be e8 03 00 00 0f af d8 e8 c2 fc ff ff 69 ca e8 03 00 00 f7 e6 31 f6 89 55 b0 8d 14 11 89 45 ac 39 d3 77 08 89 d0 31 d2 <f7> f3 89 c6 8b 4d a4 8b 45 ac f7 f3 89 74 f9 04 89 04 f9 83 c7 01
[   20.904661] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
[   20.904661] ESI: 00000000 EDI: 00000000 EBP: e756bf84 ESP: e756bf24
[   20.904661] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010246
[   20.904661] CR0: 80050033 CR2: 00000000 CR3: 02e7a000 CR4: 000406b0
[   20.904661] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   20.904661] DR6: fffe0ff0 DR7: 00000400
[   20.904661] Call Trace:
[   20.904661]  ? __kthread_parkme+0x39/0x80
[   20.904661]  kthread+0xed/0x120
[   20.904661]  ? process_durations+0x160/0x160
[   20.904661]  ? kthread_create_on_node+0x20/0x20
[   20.904661]  ret_from_fork+0x19/0x30
[   20.904661] Modules linked in:
[   21.438000] ---[ end trace 1841504cf0e16069 ]---
[   21.438311] EIP: main_func+0x1f9/0x2d8
[   21.438541] Code: c8 c2 be e8 03 00 00 0f af d8 e8 c2 fc ff ff 69 ca e8 03 00 00 f7 e6 31 f6 89 55 b0 8d 14 11 89 45 ac 39 d3 77 08 89 d0 31 d2 <f7> f3 89 c6 8b 4d a4 8b 45 ac f7 f3 89 74 f9 04 89 04 f9 83 c7 01
[   21.439651] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
[   21.440026] ESI: 00000000 EDI: 00000000 EBP: e756bf84 ESP: e756bf24
[   21.440402] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010246
[   21.440809] CR0: 80050033 CR2: 00000000 CR3: 02e7a000 CR4: 000406b0
[   21.441186] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   21.684665] DR6: fffe0ff0 DR7: 00000400
[   21.684919] Kernel panic - not syncing: Fatal exception
[   21.685231] Kernel Offset: disabled

Kboot worker: lkp-worker41
Elapsed time: 60



To reproduce:

        # build kernel
	cd linux
	cp config-5.9.0-rc1-00125-gc02cb02f8f59b .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare 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-5.9.0-rc1-00125-gc02cb02f8f59b" of type "text/plain" (144580 bytes)

View attachment "job-script" of type "text/plain" (4334 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (11288 bytes)

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