linux-kernel - [sched] 10e7071b2f: BUG:kernel_NULL_pointer

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Date:   Thu, 7 Nov 2019 17:08:08 +0800
From:   kernel test robot <lkp@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Aaron Lu <aaron.lwe@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Phil Auld <pauld@...hat.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Nishanth Aravamudan <naravamudan@...italocean.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>, lkp@...org
Subject: [sched] 10e7071b2f: BUG:kernel_NULL_pointer_dereference,address

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

commit: 10e7071b2f491b0fb981717ea0a585c441906ede ("sched: Rework CPU hotplug task selection")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

in testcase: kernel_selftests
with following parameters:

	group: kselftests-01

test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
test-url: https://www.kernel.org/doc/Documentation/kselftest.txt


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):


+-------------------------------------------------+------------+------------+
|                                                 | f95d4eaee6 | 10e7071b2f |
+-------------------------------------------------+------------+------------+
| boot_successes                                  | 54         | 12         |
| boot_failures                                   | 0          | 82         |
| BUG:kernel_NULL_pointer_dereference,address     | 0          | 79         |
| Oops:#[##]                                      | 0          | 79         |
| RIP:pick_next_task_dl                           | 0          | 79         |
| Kernel_panic-not_syncing:Fatal_exception        | 0          | 79         |
| BUG:kernel_reboot-without-warning_in_test_stage | 0          | 3          |
+-------------------------------------------------+------------+------------+


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


[   84.432464] BUG: kernel NULL pointer dereference, address: 0000000000000064
[   84.433700] #PF: supervisor read access in kernel mode
[   84.434589] #PF: error_code(0x0000) - not-present page
[   84.435499] PGD 0 P4D 0 
[   84.435933] Oops: 0000 [#1] SMP PTI
[   84.436581] CPU: 1 PID: 15 Comm: migration/1 Not tainted 5.3.0-rc1-00086-g10e7071b2f491 #1
[   84.438004] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   84.439461] RIP: 0010:pick_next_task_dl+0xe/0xf0
[   84.440266] Code: ed bd 70 01 01 e8 42 2d fb ff 0f 0b e9 6b ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 55 53 48 89 fb 48 83 ec 10 <8b> 46 64 85 c0 78 73 48 81 7e 78 a0 3f e2 a7 74 57 48 83 bb 10 09
[   84.443485] RSP: 0000:ffffa5518008bd40 EFLAGS: 00010082
[   84.444423] RAX: ffffffffa6eeeae0 RBX: ffff98ebbfd2b0c0 RCX: ffff98ebbfd2d040
[   84.445641] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff98ebbfd2b0c0
[   84.446877] RBP: ffffa5518008bdc0 R08: 0000001ac1016512 R09: 0000000000000001
[   84.448128] R10: ffffffffa863e640 R11: 0000000000000003 R12: ffff98ebbfd2b0c0
[   84.449349] R13: ffffffffa7e23fa0 R14: ffffffffa7e24060 R15: 0000000000000000
[   84.450603] FS:  0000000000000000(0000) GS:ffff98ebbfd00000(0000) knlGS:0000000000000000
[   84.452007] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   84.453022] CR2: 0000000000000064 CR3: 00000001aab84000 CR4: 00000000000406e0
[   84.454244] Call Trace:
[   84.455263]  ? update_rq_clock+0x6d/0xe0
[   84.456081]  sched_cpu_dying+0x104/0x380
[   84.456777]  ? sched_cpu_starting+0xf0/0xf0
[   84.457510]  cpuhp_invoke_callback+0x86/0x5d0
[   84.458279]  ? cpu_disable_common+0x292/0x2b0
[   84.459047]  take_cpu_down+0x60/0xb0
[   84.459649]  multi_cpu_stop+0x6b/0x100
[   84.460339]  ? stop_machine_yield+0x10/0x10
[   84.461078]  cpu_stopper_thread+0x9e/0x110
[   84.461809]  ? smpboot_thread_fn+0x2f/0x1e0
[   84.462539]  ? smpboot_thread_fn+0x74/0x1e0
[   84.463280]  ? smpboot_thread_fn+0x14e/0x1e0
[   84.464024]  smpboot_thread_fn+0x149/0x1e0
[   84.464768]  ? sort_range+0x20/0x20
[   84.465389]  kthread+0x11e/0x140
[   84.465961]  ? kthread_park+0xa0/0xa0
[   84.466605]  ret_from_fork+0x35/0x40
[   84.467236] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver binfmt_misc intel_rapl_msr intel_rapl_common sr_mod crct10dif_pclmul cdrom crc32_pclmul sg crc32c_intel ghash_clmulni_intel ata_generic pata_acpi ppdev bochs_drm drm_vram_helper ttm drm_kms_helper syscopyarea sysfillrect snd_pcm sysimgblt fb_sys_fops drm aesni_intel snd_timer ata_piix crypto_simd snd cryptd glue_helper libata soundcore pcspkr joydev serio_raw parport_pc i2c_piix4 parport floppy ip_tables
[   84.474471] CR2: 0000000000000064
[   84.475066] ---[ end trace af8f1919a81ca744 ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.3.0-rc1-00086-g10e7071b2f491 .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 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-5.3.0-rc1-00086-g10e7071b2f491" of type "text/plain" (199569 bytes)

View attachment "job-script" of type "text/plain" (7120 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (18656 bytes)