Re: [PATCH v2] powerpc/ftrace: Don't restore r13 during ftrace_regs_caller

On Mon, 21 Sep 2026 12:51:50 +0530, Shrikanth Hegde wrote:

Michal reported a stack-protector failure and subsequent panic when
running kernel builds. This was observed with full/lazy preemption.
Initially it was suspected as KVM, but later turned out to be due
to a bcc tool running in parallel.

Issue was recreated using a bcc tool.
For example, running below in parallel leads to crash.
./funccount sched* -d 100 and make -j 64

[...]

Applied to powerpc/next.

[1/1] powerpc/ftrace: Don't restore r13 during ftrace_regs_caller
      https://git.kernel.org/powerpc/c/af5f0870883ae4aea7f668d06cbb7ad0e12824c8

cheers