On Wed, 20 May 2020 23:36:05 +1000, Michael Ellerman wrote:

Several strange crashes have been eventually traced back to
STRICT_KERNEL_RWX and its interaction with code patching.

Various paths in our ftrace, kprobes and other patching code need to
be hardened against patching failures, otherwise we can end up running
with partially/incorrectly patched ftrace paths, kprobes or jump
labels, which can then cause strange crashes.

[...]

Applied to powerpc/fixes.

[1/1] powerpc/64s: Disable STRICT_KERNEL_RWX
      https://git.kernel.org/powerpc/c/8659a0e0efdd975c73355dbc033f79ba3b31e82c

cheers