netdev - Re: [BUG]: WARNING: CPU: 5 PID: 0 at net/sched/sch_generic.c:442 dev

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Date:   Tue, 13 Apr 2021 23:43:02 +0200
From:   Xose Vazquez Perez <xose.vazquez@...il.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Realtek NIC <nic_swsd@...ltek.com>,
        NETDEV ML <netdev@...r.kernel.org>,
        KERNEL ML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG]: WARNING: CPU: 5 PID: 0 at net/sched/sch_generic.c:442
 dev_watchdog+0x24d/0x260


On 4/13/21 11:07 PM, Heiner Kallweit wrote:

> On 13.04.2021 22:59, Xose Vazquez Perez wrote:
>> A non-recurring bug, on 5.11.12-300.fc34.x86_64 (Fedora kernel).
>>
>> Thanks.
>>
>>
>> 0c:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 06)
>>
>> [    2.968280] libphy: r8169: probed
>> [    2.968844] r8169 0000:0c:00.0 eth0: RTL8168e/8111e, 2c:41:38:9e:98:93, XID 2c2, IRQ 47
>> [    2.968849] r8169 0000:0c:00.0 eth0: jumbo features [frames: 9194 bytes, tx checksumming: ko]
>> [    4.071966] RTL8211DN Gigabit Ethernet r8169-c00:00: attached PHY driver (mii_bus:phy_addr=r8169-c00:00, irq=IGNORE)
>> [    4.323834] r8169 0000:0c:00.0 eth0: Link is Down
>> [    6.729111] r8169 0000:0c:00.0 eth0: Link is Up - 1Gbps/Full - flow control rx/tx
>>
>> [106378.638739] ------------[ cut here ]------------
>> [106378.638757] NETDEV WATCHDOG: eth0 (r8169): transmit queue 0 timed out
> 
> This is a standard tx timeout and can have very different reasons.
> Few questions:
> 
> - Is this a regression? If yes, can you bisect?
> - Can you reproduce it? If yes, which type of activity triggers it?

This is the first and only time I've seen a bug in r8169 on this machine in nine years.
Nothing special, web browsing, git cloning, dnf updating, ...
It's a non-recurring bug.

Now it's running 5.11.13-300.fc34.x86_64, stable as always.


Thank you.