Re: [Buildroot] [PATCH v2] configs/visionfive2_defconfig: bump Linux to 6.18.55

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

On Sun, Oct 11, 2026 at 12:31:48AM +0800, Fengwei Tan wrote:
> When running iperf3 with Linux 6.18.51 on VisionFive 2, one CPU core
> stays at 100% load during the test, while network throughput is limited
> to approximately 793 Mbits/sec:
> 
> [ ID] Interval           Transfer     Bitrate
> [  5]   0.00-10.01  sec   945 MBytes   793 Mbits/sec                  receiver
> 
> The regression was introduced in Linux 6.14 by commit df542f669307
> ("net: stmmac: Switch to zero-copy in non-XDP RX path"). It leads to
> misaligned access exceptions when parsing packet headers. During the
> iperf3 test, perf stat reported approximately 9.6 million alignment
> faults over 5 seconds:
> 
> $ perf stat -a -e alignment-faults -- sleep 5
> 
>  Performance counter stats for 'system wide':
> 
>            9620073      alignment-faults
> 
>        5.029337000 seconds time elapsed
> 
> The kernel must emulate these unaligned accesses, resulting in
> significant overhead.
> 
> The issue was fixed in Linux 6.18.52 [1]. Bump Linux to 6.18.55, the
> latest stable release at the time of writing, to include the fix.
> 
> [1] https://lore.kernel.org/all/2026091704-CVE-2026-90059-36e6@gregkh
> 
> Fixes: 98aa14a186e1 ("configs/visionfive2: bump Linux to 6.18.51, U-Boot to 2026.07, and OpenSBI to 1.8.1")
> Assisted-by: LLM
> Signed-off-by: Fengwei Tan <tfx2001@outlook.com>

Applied to master, thanks!

Best regards,

Thomas Petazzoni
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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