Hi Shinichiro, Sorry to jump in, but I *think* our CI for the MPTCP subsystem is hitting the same issue.
On 30/01/2026 12:16, Shinichiro Kawasaki wrote: > On Jan 29, 2026 / 15:19, Paul E. McKenney wrote: > [...] >>>>> I have seen the static-key pattern called out by Dave Chinner when running >>>>> KASAN on large systems. We worked around this by disabling KASAN's use >>>>> of static keys. In case you were running KASAN in these tests. >>>> >>>> As to KASAN, yes, I enable it in my test runs. I find three static-keys >>>> under >>>> mm/kasan/*. I will think if they can be disabled in my test runs. Thanks. >>> >>> There is a set of Kconfig options that disables static branches. If you >>> cannot find them quickly, please let me know and I can look them up. > > Thank you. But now I know the fix series by Thomas is available. I prioritize > the evaluation of the fix series. Later on, I will try disabling the > static-keys > if it is required. > >> >> And Thomas Gleixner posted an alleged fix to the CID issue here: >> >> https://lore.kernel.org/lkml/[email protected]/ >> >> Please let him know whether or not it helps. > > Good to see this fix candidate series, thanks :) I have set up the patches and > started my regular test runs. So far, the hangs have been observed once or > twice > a week. To confirm the effect of the fix series, I think two weeks runs will > be > required. Once I get the result, will share it on this thread and with Thomas. I know it is only one week now, but did you see any effects so far? On my side, I applied the v2 series -- which has been applied in tip/sched/urgent -- but I still have issues, and it looks like it is even more frequent. Maybe what I see is different. If you no longer see the issues on your side after one week, I'm going to start a new thread with my issues not to mix them. Note that in my case, the issue is visible on a system where nested VMs are used, with and without KASAN (enabled via debug.config), just after having started a VSOCK listening socket via socat. Cheers, Matt -- Sponsored by the NGI0 Core fund.
