Re: [REGRESSION][BISECTED] stmmac: suspend hangs since 1b9707e6f1a9 ("net: stmmac: enable RPS and RBU interrupts")

On Thu, Jul 16, 2026 at 10:10:25PM +0200, tresonic wrote:

Hello,
Please bear with me, this is my first time writing to a mailing list...

Thanks for the report. Nice description for a first post. Lots of
useful details.

Since commit 1b9707e6f1a9, suspend (systemctl suspend) causes a full system freeze on my laptop. Fans and keyboard backlight stay powered; the machine is completely unresponsive and requires a hard power-off (holding the power button) to recover. I could not get any kernel output from the hang.

1b9707e6f1a9 makes in effect 4 changes.

Can you do some testing to see if the changes to
DMA_CHAN_INTR_ABNORMAL or the changes to DMA_CHAN_INTR_ABNORMAL_4_10
break it. Or both, but i think that is unlikely.

Once you know which of those is responsible, can you test to see which
of DMA_CHAN_INTR_ENA_RPS or DMA_CHAN_INTR_ENA_RBU broke it.

It kind of sounds like an interrupt storm, but that is just a
guess. If it is an interrupt storm, it suggests an interrupt is not
being disabled during suspend.

   Andrew