linux-kernel - [lkp-robot] [perf/core] bc2a73c243: WARNING:at_include/linux/cpumask.h:#find_get

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Date:   Mon, 13 Feb 2017 10:38:02 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Mars Cheng <mars.cheng@...iatek.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        CC Hwang <cc.hwang@...iatek.com>,
        Loda Chou <loda.chou@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>,
        Jades Shih <jades.shih@...iatek.com>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        My Chuang <my.chuang@...iatek.com>,
        linux-kernel@...r.kernel.org, wsd_upstream@...iatek.com,
        Mars Cheng <mars.cheng@...iatek.com>, lkp@...org
Subject: [lkp-robot] [perf/core]  bc2a73c243:
 WARNING:at_include/linux/cpumask.h:#find_get_context


FYI, we noticed the following commit:

commit: bc2a73c243d6adbb089de6c09a7aff1ae8ac645d ("perf/core: remove useless cast when comparing")
url: https://github.com/0day-ci/linux/commits/Mars-Cheng/perf-core-remove-useless-cast-when-comparing/20170209-192016


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 -m 320M

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


+------------------------------------------------------+------------+------------+
|                                                      | b6263178b8 | bc2a73c243 |
+------------------------------------------------------+------------+------------+
| boot_successes                                       | 14         | 7          |
| boot_failures                                        | 2          | 9          |
| BUG:kernel_reboot-without-warning_in_test_stage      | 2          | 1          |
| WARNING:at_include/linux/cpumask.h:#find_get_context | 0          | 8          |
| BUG:unable_to_handle_kernel                          | 0          | 8          |
| Oops                                                 | 0          | 8          |
| Kernel_panic-not_syncing:Fatal_exception             | 0          | 8          |
+------------------------------------------------------+------------+------------+



[  180.446116] WARNING: CPU: 0 PID: 1432 at include/linux/cpumask.h:121 find_get_context+0x66/0x1f2
[  180.502044] Modules linked in:
[  180.514134] CPU: 0 PID: 1432 Comm: trinity-main Not tainted 4.10.0-rc6-00189-gbc2a73c2 #2
[  180.531792] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[  180.552398] Call Trace:
[  180.559045]  dump_stack+0x58/0x72
[  180.567078]  ? find_get_context+0x66/0x1f2
[  180.576443]  __warn+0xb2/0xc9
[  180.583902]  warn_slowpath_null+0x11/0x16
[  180.593006]  find_get_context+0x66/0x1f2
[  180.601982]  ? SyS_perf_event_open+0x4c5/0xc51
[  180.611701]  SyS_perf_event_open+0x5f6/0xc51
[  180.621237]  do_int80_syscall_32+0x47/0x8e
[  180.630666]  entry_INT80_32+0x2a/0x2a
[  180.639221] EIP: 0x8090aa2
[  180.646343] EFLAGS: 00000286 CPU: 0
[  180.654643] EAX: ffffffda EBX: 08a24a78 ECX: ffffffff EDX: ffffffff
[  180.667481] ESI: 0000011a EDI: 00000001 EBP: 0000011c ESP: bfbfc288
[  180.680152]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[  180.691684] ---[ end trace c7d7fa25409a3428 ]---


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong

View attachment "config-4.10.0-rc6-00189-gbc2a73c2" of type "text/plain" (102612 bytes)

View attachment "job-script" of type "text/plain" (3757 bytes)

Download attachment "dmesg.xz" of type "application/octet-stream" (12328 bytes)