[devlink] 7d172b8be5: WARNING:at_net/core/devlink.c:#devlink_port_type_warn

Sunday, 5 May 2019

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

commit: 7d172b8be57c2150fa5ce9642b677859aba7aec0 ("devlink: add warning in case
driver does not set port type")
bash: warning:

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 2G

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

+-------------------------------------------------------+------------+------------+
|                                                       | 8ef988b914 | 7d172b8be5 |
+-------------------------------------------------------+------------+------------+
| boot_successes                                        | 4          | 0          |
| boot_failures                                         | 0          | 4          |
| WARNING:at_net/core/devlink.c:#devlink_port_type_warn | 0          | 4          |
| RIP:devlink_port_type_warn                            | 0          | 4          |
+-------------------------------------------------------+------------+------------+

If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp(a)intel.com&gt;

[   44.924626] WARNING: CPU: 0 PID: 223 at net/core/devlink.c:5396
devlink_port_type_warn+0xc/0x10
[   44.928075] CPU: 0 PID: 223 Comm: kworker/0:3 Tainted: G                T
5.1.0-rc7-01593-g7d172b8 #1
[   44.930382] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1
04/01/2014
[   44.932317] Workqueue: events devlink_port_type_warn
[   44.933858] RIP: 0010:devlink_port_type_warn+0xc/0x10
[   44.935285] Code: eb 91 ba a6 ff ff ff eb b1 ba f4 ff ff ff eb aa 66 66 2e 0f 1f 84 00
00 00 00 00 0f 1f 00 48 c7 c7 50 3d 6a 82 e8 94 e3 74 ff <0f> 0b c3 90 41 55 41 54
41 89 f5 55 53 48 89 fb 49 89 d4 80 7b 2c
[   44.940208] RSP: 0000:ffffc9000043fe68 EFLAGS: 00010292
[   44.941632] RAX: 0000000000000022 RBX: ffff88806506aaa0 RCX: 0000000000000006
[   44.943516] RDX: 0000000000000006 RSI: ffff88807fbe6ca0 RDI: ffff88807fbe6a40
[   44.945078] RBP: ffffc9000043fec8 R08: 0000000000000000 R09: 0000000000000000
[   44.946714] R10: ffffc9000043fd88 R11: 0000000000000000 R12: ffffffff8285f3a0
[   44.948410] R13: ffff88807b8c2600 R14: 0000000000000000 R15: ffff88806506aaa8
[   44.950069] FS:  0000000000000000(0000) GS:ffffffff82848000(0000)
knlGS:0000000000000000
[   44.951940] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   44.953245] CR2: 0000565234e78030 CR3: 000000007e7af000 CR4: 00000000000006f0
[   44.954870] DR0: 00007f5493f29000 DR1: 0000000000000000 DR2: 0000000000000000
[   44.956508] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[   44.958168] Call Trace:
[   44.958772]  ? process_one_work+0x252/0x570
[   44.959820]  ? worker_thread+0x37/0x380
[   44.960650]  ? process_one_work+0x570/0x570
[   44.961666]  ? kthread+0x117/0x130
[   44.962435]  ? __kthread_create_on_node+0x180/0x180
[   44.963626]  ? ret_from_fork+0x24/0x30
[   44.964455] irq event stamp: 5984
[   44.965271] hardirqs last  enabled at (5983): [<ffffffff8114d088>]
vprintk_emit+0xf8/0x270
[   44.967144] hardirqs last disabled at (5984): [<ffffffff81002e55>]
trace_hardirqs_off_thunk+0x1a/0x1c
[   44.969511] softirqs last  enabled at (5902): [<ffffffff81306cb8>]
nfs_write_completion+0x138/0x140
[   44.971664] softirqs last disabled at (5898): [<ffffffff8121a419>]
wb_wakeup_delayed+0x29/0x60
[   44.973677] ---[ end trace 5f94219778cf162c ]---

To reproduce:

        # build kernel
	cd linux
	cp config-5.1.0-rc7-01593-g7d172b8 .config
	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,
lkp

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