it just came to my attention when debugging another issue, the now stable valgrind-3.18.1 has missing syscalls: on amd64: WARNING: unhandled amd64-linux syscall: 334 on arm64: WARNING: unhandled arm64-linux syscall: 293 both missing syscalls are fixed in =dev-util/valgrind-3.19.0 maybe want to stabilize this version?
I'm also affected by this. Unmasking valgrind fixes the issue.
fixed via #869251