On 2020-06-16 07:30:33 [+0000], Roosen Henri wrote: > Hi RT-experts, > > Duration tests with RT enabled v4.14 kernels on our ARM iMX6Q systems > are showing "Unable to handle kernel NULL pointer dereference at > virtual address" after running for some months. The same tests on NON- > RT kernels don't show any problem and have been running without any > problems for more than 20 months now. > > I've been updating the tests from time to time with more recent > kernels. Testing is basically done with cyclictest, in parallel with > some load scripts/hackbench. Please have a look at the kernel traces: > 4.14.71-rt44 -> https://paste.debian.net/1152206/ > 4.14.106-rt56 -> https://paste.debian.net/1152204/ > 4.14.146-rt67 -> https://paste.debian.net/1152202/ > > I've seen the v4.14-rt branch got some fixes, so my questions are: > 1) is problem I'm facing known and fixed in v4.14-rt, or > 2) is the problem I'm seeing a new issue probably still unfixed in > 4.14.183-rt83 (which I'm testing right now)? > > Any help is highly appreciated! So this has not fixed all by itself? Is the 4.14 series the only one that is affected? > Thanks, > Henri Sebastian
