Hi Sebastian, Thank you for the feedback, it is very helpful. Could you please provide us with a pointer to the bug? Thanks again! Regards, Sergei On Fri, 2021-01-08 at 09:29 +0100, Sebastian Andrzej Siewior wrote: > On 2021-01-07 17:49:02 [+0100], To Sergei Poselenov wrote: > > On 2020-12-30 14:09:17 [+0300], Sergei Poselenov wrote: > > > Hello, > > Hi, > > > > > We applied patch-5.4.47-rt28.patch to NXP 5.4.47-2.2.0 release > > > ARM64 > > > kernel running on IMX8M NANO chip, and enabled CONFIG_PRREMPT_RT. > > > We > > > are observing the following crash (below), on a system running an > > > application that communicates with some SPI device. Obviously, > > > the > > > system doesn't crash without the patch applied. > > > > > > Any thoughts on the reason of the failure would be appreciated. > > > How would we start debugging the problem? > > > > Can you give v5.10 a try v5.10 and/or enable SLUB_DEBUG? > > Now that I look at it again, you need update to more recent v5.4-RT > kernel. The current is v5.4.84-rt47, the bug was fixed in v5.4.54- > rt33. > > > > Thanks! > > > > > > Regards, > > > Sergei Poselenov, > > > Emcraft Systems > Sebastian
