runtime: ppc64x binaries randomly segfault on linux 5.13rc6 [1.15 backport]

[gopherbot]

@pmur requested issue #46803 to be considered for backport to the next 1.15 minor release.

@gopherbot please consider a backport to 1.16 and 1.15. This is necessary for running any linux kernel version 5.13 or above.

[gopherbot]

Change https://golang.org/cl/334411 mentions this issue: [release-branch.go1.15] runtime: fix crash during VDSO calls on PowerPC

[cagedmantis]

This issue is being approved. This is a major problem without a viable workaround.

[gopherbot]

Closed by merging 7921829 to release-branch.go1.15.