linux-kernel - [kunit] 3b29021ddd: BUG:kernel_NULL_pointer

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Message-ID: <20210930063730.GC29843@xsang-OptiPlex-9020>
Date:   Thu, 30 Sep 2021 14:37:30 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Daniel Latypov <dlatypov@...gle.com>
Cc:     Shuah Khan <skhan@...uxfoundation.org>,
        David Gow <davidgow@...gle.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: [kunit]  3b29021ddd: BUG:kernel_NULL_pointer_dereference,address



Greeting,

FYI, we noticed the following commit (built with clang-14):

commit: 3b29021ddd10cfb6b2565c623595bd3b02036f33 ("kunit: tool: allow filtering test cases via glob")
https://git.kernel.org/cgit/linux/kernel/git/shuah/linux-kselftest.git kunit


in testcase: boot

on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

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


+--------------------------------------------------------------------------+------------+------------+
|                                                                          | 2e53f56af3 | 3b29021ddd |
+--------------------------------------------------------------------------+------------+------------+
| BUG:kernel_NULL_pointer_dereference,address                              | 0          | 22         |
| Oops:#[##]                                                               | 0          | 23         |
| EIP:strcmp                                                               | 0          | 20         |
| Kernel_panic-not_syncing:Fatal_exception                                 | 0          | 22         |
+--------------------------------------------------------------------------+------------+------------+


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


[   74.983767][  T243] BUG: kernel NULL pointer dereference, address: 00000000
[   74.984577][  T243] #PF: supervisor read access in kernel mode
[   74.984946][  T243] #PF: error_code(0x0000) - not-present page
[   74.985316][  T243] *pde = 00000000
[   74.985549][  T243] Oops: 0000 [#1]
[   74.985776][  T243] CPU: 0 PID: 243 Comm: kunit_try_catch Tainted: G        W         5.15.0-rc1-00002-g3b29021ddd10 #1
[   74.986494][  T243] EIP: strcmp+0xe/0x40
[   74.986753][  T243] Code: 75 f7 31 c0 c4 04 5e 5f c4 04 5e 5f 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 00 55 89 e5 00 55 89 e5 89 c6 ac ae 89 c6 <ac> ae 75
f8 31 c0 75 f8 31 c0 0c 01 5e 5f 0c 01 5e 5f 90 90 90 90
[   74.987988][  T243] EAX: 00000000 EBX: f53c0108 ECX: 00000001 EDX: c33a266c
[   74.988425][  T243] ESI: 00000000 EDI: c33a266c EBP: f52d3ee0 ESP: f52d3ed8
[   74.988864][  T243] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010286
[   74.989332][  T243] CR0: 80050033 CR2: 00000000 CR3: 03ec2000 CR4: 000406d0
[   74.989771][  T243] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   74.990219][  T243] DR6: fffe0ff0 DR7: 00000400
[   74.990505][  T243] Call Trace:
[   74.990708][  T243]  filter_suites_test+0x319/0x340
[   74.991021][  T243]  ? kunit_binary_ptr_assert_format+0xc0/0xc0
[   74.991394][  T243]  ? trace_hardirqs_on+0x4f/0xc0
[   74.991701][  T243]  kunit_try_run_case+0x3c/0xc0
[   74.992000][  T243]  kunit_generic_run_threadfn_adapter+0x16/0x40
[   74.992383][  T243]  kthread+0x14c/0x180
[   74.992634][  T243]  ? kunit_try_catch_run+0x180/0x180
[   74.992971][  T243]  ? kthread_unuse_mm+0xc0/0xc0
[   74.993269][  T243]  ret_from_fork+0x1c/0x28
[   74.993541][  T243] Modules linked in:
[   74.993779][  T243] CR2: 0000000000000000
[   74.994045][  T243] ---[ end trace e46267553c50ccd5 ]---
[   74.994391][  T243] EIP: strcmp+0xe/0x40
[   74.994643][  T243] Code: 75 f7 31 c0 c4 04 5e 5f c4 04 5e 5f 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 00 55 89 e5 00 55 89 e5 89 c6 ac ae 89 c6 <ac> ae 75
f8 31 c0 75 f8 31 c0 0c 01 5e 5f 0c 01 5e 5f 90 90 90 90
[   74.995853][  T243] EAX: 00000000 EBX: f53c0108 ECX: 00000001 EDX: c33a266c
[   74.996456][  T243] ESI: 00000000 EDI: c33a266c EBP: f52d3ee0 ESP: f52d3ed8
[   74.997031][  T243] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010286
[   74.997499][  T243] CR0: 80050033 CR2: 00000000 CR3: 03ec2000 CR4: 000406d0
[   74.997937][  T243] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   74.998384][  T243] DR6: fffe0ff0 DR7: 00000400
[   74.998670][  T243] Kernel panic - not syncing: Fatal exception
[   74.999042][  T243] Kernel Offset: disabled



To reproduce:

        # build kernel
	cd linux
	cp config-5.15.0-rc1-00002-g3b29021ddd10 .config
	make HOSTCC=clang-14 CC=clang-14 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

        # if come across any failure that blocks the test,
        # please remove ~/.lkp and /lkp dir to run from a clean state.



---
0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org       Intel Corporation

Thanks,
Oliver Sang


View attachment "config-5.15.0-rc1-00002-g3b29021ddd10" of type "text/plain" (143020 bytes)

View attachment "job-script" of type "text/plain" (4736 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (18736 bytes)