[Bug 2141544] Re: Regression: r8169 transmit queue timed out on Kernel 6.17.0-14 (Realtek RTL8111/8168)

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: linux (Ubuntu)
Status: New => Confirmed

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Title:
Regression: r8169 transmit queue timed out on Kernel 6.17.0-14
(Realtek RTL8111/8168)

Status in linux package in Ubuntu:
Confirmed

Bug description:
Summary: Regression: r8169 [10ec:8168] transmit queue timed out on
Kernel 6.17.0-14-generic

Description:
A regression has been observed in the r8169 driver after updating to kernel 6.17.0-14-generic. The ethernet interface links up and is assigned an IP address, but fails to transmit any data.

1) Ubuntu Release:
Ubuntu 24.04.3 LTS (Noble Numbat)

2) Package Version:
linux-image-6.17.0-14-generic

3) Expected Behaviour:
The ethernet interface enp3s0 should transmit and receive packets normally, as it does on the 6.14.0-37-generic kernel.
**Summary:**
Ethernet interface `enp3s0` fails to transmit packets on Kernel `6.17.0-14-generic`.
Link reports as UP, IP is assigned, but 0 packets are transmitted.
`dmesg` reports repeated `NETDEV WATCHDOG: transmit queue timed out` errors.
The system works correctly on the previous kernel `6.14.0-37-generic`.

**Hardware:**
- **Motherboard:** Gigabyte GA-78LMT-USB3
- **Network Controller:** Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
- **Driver:** r8169

**Regression:**
- **Working Kernel:** 6.14.0-37-generic
- **Broken Kernel:** 6.17.0-14-generic

**Observed Symptoms:**
- Interface `enp3s0` comes up but cannot ping gateway.
- `dmesg` shows:
- `enp3s0: renamed from eth0`
- `NETDEV WATCHDOG: enp3s0 (r8169): transmit queue 0 timed out`
- `r8169: Netdev watchdog: CPU: 3, transmit queue 0 timed out`

**Info:**
Booting into previous kernel `6.14.0-37-generic` restores full functionality.

4) Actual Behaviour:
The interface fails to transmit data. Pings to the local gateway result in 100% packet loss. dmesg logs are flooded with "NETDEV WATCHDOG" timeout errors.

Hardware Details:
- Controller: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
- PCI ID: 10ec:8168
- Motherboard: Gigabyte GA-78LMT-USB3
- Driver in use: r8169

Regression Comparison:
- Working Kernel: 6.14.0-37-generic
- Broken Kernel: 6.17.0-14-generic

Relevant dmesg Output:
[ ...] enp3s0: renamed from eth0
[ ...] NETDEV WATCHDOG: enp3s0 (r8169): transmit queue 0 timed out
[ ...] r8169 0000:03:00.0 enp3s0: link up
[ ...] r8169: Netdev watchdog: CPU: 3, transmit queue 0 timed out

Tags: noble kernel-regression r8169 10ec:8168

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