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Date: Wed, 22 Jul 2020 10:59:14 +0000
From: Bruno Thomsen <bth@...strup.com>
To: Andrew Lunn <andrew@...n.ch>, Fabio Estevam <festevam@...il.com>
CC: netdev <netdev@...r.kernel.org>,
Florian Fainelli <f.fainelli@...il.com>,
Russell King - ARM Linux <linux@...linux.org.uk>,
Heiner Kallweit <hkallweit1@...il.com>,
Lars Alex Pedersen <laa@...strup.com>,
Bruno Thomsen <bth@...strup.com>,
"bruno.thomsen@...il.com" <bruno.thomsen@...il.com>
Subject: Re: fec: micrel: Ethernet PHY type ID auto-detection issue
Hi Andrew,
> > > I have been having issues with Ethernet PHY type ID
> > > auto-detection when changing from the deprecated fec
> > > phy-reset-{gpios,duration,post-delay} properties to the
> > > modern mdio reset-{assert-us,deassert-us,gpios}
> > > properties in the device tree.
>
> > > Kernel error messages (modem mdio reset):
> > > mdio_bus 30be0000.ethernet-1: MDIO device at address 1 is missing.
> > > fec 30be0000.ethernet eth0: Unable to connect to phy
>
> It sounds like the PHY is not responding during scanning of the bus.
Yes, that is correct.
> If the ID is mostly 0xff there is no device there.
>
> So check the initial reset state of the PHY, and when is it taken out
> of reset, and is the delay long enough for it to get itself together
> and start answering requests.
When capturing traces with a logic analyzer, I do the following:
- break the target in the bootloader
- start trigger on reset or mdio signal (had to use mdio as reset wasn't used)
- boot linux
I monitor 4 signals: MDIO, MDC, 3V3, reset.
The new mdio code path does not reset the PHY before reading
of PHY type ID and for some reason this result in no responce,
e.g. high (0xFFFF) and missing MDIO turnaround.
MDC is 2.5MHz, and I can decode the 2 read requests with a logic
analyzer:
START C22
OPCODE [Read]
PHY Address ['1' (0x01)]
Register Address ['2' (0x02)]
!Turnaround
Data ['65535' (0xFFFF)]
START C22
OPCODE [Read]
PHY Address ['1' (0x01)]
Register Address ['3' (0x03)]
!Turnaround
Data ['65535' (0xFFFF)]
When using the deprecated fec phy reset code path, the PHY
chip is reset just before reading of register 0x02 and 0x03.
In this case the PHY respond correct with 0x0022 and 0x1561.
When looking at the mdio code I don't understand how the
reset code should even work in the first place.
> static int mdio_probe(struct device *dev)
> {
> struct mdio_device *mdiodev = to_mdio_device(dev);
> struct device_driver *drv = mdiodev->dev.driver;
> struct mdio_driver *mdiodrv = to_mdio_driver(drv);
> int err = 0;
>
> if (mdiodrv->probe) {
> /* Deassert the reset signal */
> mdio_device_reset(mdiodev, 0);
This assumes that the reset signal is asserted already.
Not my case and it seems very flaky.
Deprecated fec code assert reset signal before reset assert delay,
following deassert reset and deassert delay.
https://elixir.bootlin.com/linux/latest/source/drivers/net/ethernet/freescale/fec_main.c#L3373
>
> err = mdiodrv->probe(mdiodev);
> if (err) {
> /* Assert the reset signal */
> mdio_device_reset(mdiodev, 1);
Reset signal is asserted in error path but there are no
retry on probe.
> void mdio_device_reset(struct mdio_device *mdiodev, int value)
> {
> unsigned int d;
>
> ......
>
> d = value ? mdiodev->reset_assert_delay : mdiodev->reset_deassert_delay;
> if (d)
> usleep_range(d, d + max_t(unsigned int, d / 10, 100));
This is not the recommended way of sleeping if d > 20ms.
https://www.kernel.org/doc/Documentation/timers/timers-howto.txt
The deprecated fec code handles this correctly.
https://elixir.bootlin.com/linux/latest/source/drivers/net/ethernet/freescale/fec_main.c#L3381
if (d)
if (d > 20000)
msleep(d / 1000);
else
usleep_range(d, d + max_t(unsigned int, d / 10, 100));
Micrel recommended reset circuit has a deassert tau of 100ms, e.g. 10k * 10uF.
So to be sure the signal is deasserted 5 * tau or more, and this brings the value
up in the 500-1000ms range depending on component tolerances and design
margin.
See figure 22 in pdf for reset circuit.
http://ww1.microchip.com/downloads/en/devicedoc/ksz8081mnx-rnb.pdf
So my current conclusion is that using generic mdio phy handling does
not work with Micrel PHYs unless 3 issues has been resolved.
- Reset PHY before auto type detection.
- Add initial assert reset signal + delay when resetting phy.
- Handle >20ms reset delays.
/Bruno
----
When using the 5.8.0-rc6 kernel (dirty due to device tree changes),
I sometimes hit this kernel issue (never seen it with 5.7.8 or earlier),
but don't think it's related:
kernel: =============================================================================
kernel: BUG task_struct(119:NetworkManager-dispatcher.service) (Not tainted): Poison overwritten
kernel: -----------------------------------------------------------------------------
kernel: Disabling lock debugging due to kernel taint
kernel: INFO: 0xe05e9b3f-0x9b36c418 @offset=30464. First byte 0xff instead of 0x6b
kernel: INFO: Slab 0xaa165da6 objects=18 used=0 fp=0x37e5d9c3 flags=0x10200
kernel: INFO: Object 0xf19b9dd9 @offset=29440 fp=0x00000000
kernel: Redzone cb135af3: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
kernel: Redzone a0061a8a: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
kernel: Redzone f2917653: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
kernel: Redzone aeb00bb5: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................
kernel: Object f19b9dd9: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object cadb3eab: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object a51c2cd1: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 6b25d1e5: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 1e35e7e8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object aea2a999: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object e160fc75: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object c1c29834: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 17ff6205: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object a6781094: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object ce2fd05e: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 7daa8dfb: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 4c0e09e9: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object b23b73b7: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 698ecfeb: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object c0437471: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object a9236eff: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 4a6eac62: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 7fda2c51: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 8f143bf4: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object aaa2bfdd: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 22d54b92: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 8fcef107: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object d2a1c8a9: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object b25c8021: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 1bed0f85: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object a6c9ddc2: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 306f6960: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 478e89fc: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 90f8a983: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 0d8a4733: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 254b16da: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 409e6dac: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object d043695a: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object abee8a24: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 18715fa9: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object fb3630b3: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 3aaedaf7: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 32565782: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 26869f35: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 789a34f9: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 8865b386: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object a0d7868e: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 9cd04fce: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 4214b445: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 9d69b597: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 845ea8c4: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 2c937a0b: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object eb5293e8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object dab824c2: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object bfa6c2fa: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object a2c4a8be: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 5e1f207c: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object a974428f: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 91af2a44: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 6f71ee6f: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object d4abc42d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 3737f8db: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 65bd39e9: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object cd12758c: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 212096ca: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 8462745b: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object a430d1b2: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 7a0d1289: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object e05e9b3f: ff 4d ff ff ff ff ff ff 10 e7 c6 77 3e 38 08 00 .M.........w>8..
kernel: Object 8c5945af: 45 00 00 48 42 05 00 00 80 11 75 5c ac 14 15 1c E..HB.....u\....
kernel: Object de1b76ee: ac 14 15 ff e1 15 e1 15 00 34 8a 61 53 70 6f 74 .........4.aSpot
kernel: Object a54d91d1: 55 64 70 30 94 e4 06 54 2b ed 49 66 00 01 00 04 Udp0...T+.If....
kernel: Object 08ebc3be: 48 95 c2 03 94 eb 5d 89 b7 b5 0c 41 d7 12 76 ea H.....]....A..v.
kernel: Object ff29f54f: b1 7e 4d ed bb 74 cc c7 62 3d 2f 10 bb 74 cc c7 .~M..t..b=/..t..
kernel: Object 9678dfaa: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
kernel: Object 426da6d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
kernel: Object 7fab2713: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 60862a98: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 0810ad40: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 1f0aa745: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 19944bf2: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 4ce341aa: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 9607ec6d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object a5915de7: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object d686baa6: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 1df19b0d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 0bbe9a96: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 6f1e7700: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 824ce600: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 790d4580: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object f8a184dd: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object f65d9e18: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object b52e601b: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 82bf9d2e: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object bf8060fe: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object e90100be: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object ea74812b: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object e6403677: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object faf222d4: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object dca677d2: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 1c2391f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object fb8b9c6d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 967ee7ed: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object f597fef4: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk.
kernel: Redzone 13b0f2f9: bb bb bb bb ....
kernel: Padding 372127fe: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
kernel: Padding 6d5fbace: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
kernel: CPU: 0 PID: 127 Comm: kworker/0:3 Tainted: G B 5.8.0-rc6-00008-g87d248347e60-dirty #1
kernel: Hardware name: Freescale i.MX7 Dual (Device Tree)
kernel: Workqueue: memcg_kmem_cache kmemcg_workfn
kernel: [<8010ed20>] (unwind_backtrace) from [<8010b734>] (show_stack+0x10/0x14)
kernel: [<8010b734>] (show_stack) from [<8047caf4>] (dump_stack+0x8c/0xa0)
kernel: [<8047caf4>] (dump_stack) from [<8027351c>] (check_bytes_and_report+0xcc/0xe8)
kernel: [<8027351c>] (check_bytes_and_report) from [<80274e0c>] (check_object+0x248/0x2ac)
kernel: [<80274e0c>] (check_object) from [<80274edc>] (__free_slab+0x6c/0x2bc)
kernel: [<80274edc>] (__free_slab) from [<80279a1c>] (__kmem_cache_shrink+0x1f4/0x248)
kernel: [<80279a1c>] (__kmem_cache_shrink) from [<80279a7c>] (__kmemcg_cache_deactivate_after_rcu+0xc/0x4c)
kernel: [<80279a7c>] (__kmemcg_cache_deactivate_after_rcu) from [<80249bb8>] (kmemcg_cache_deactivate_after_rcu+0xc/0x1c)
kernel: [<80249bb8>] (kmemcg_cache_deactivate_after_rcu) from [<80249b98>] (kmemcg_workfn+0x24/0x38)
kernel: [<80249b98>] (kmemcg_workfn) from [<80140000>] (process_one_work+0x19c/0x3e4)
kernel: [<80140000>] (process_one_work) from [<8014028c>] (worker_thread+0x44/0x4dc)
kernel: [<8014028c>] (worker_thread) from [<80146a2c>] (kthread+0x144/0x180)
kernel: [<80146a2c>] (kthread) from [<80100148>] (ret_from_fork+0x14/0x2c)
kernel: Exception stack(0xbb1d5fb0 to 0xbb1d5ff8)
kernel: 5fa0: 00000000 00000000 00000000 00000000
kernel: 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
kernel: 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
kernel: FIX task_struct(119:NetworkManager-dispatcher.service): Restoring 0xe05e9b3f-0x9b36c418=0x6b
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