Valgrind version: 3.16.1 (not in Version dropdown) Linux version: 5.4.50 --17220-- WARNING: unhandled amd64-linux syscall: 315 --17220-- You may be able to write your own handler. --17220-- Read the file README_MISSING_SYSCALL_OR_IOCTL. --17220-- Nevertheless we consider this a bug. Please report --17220-- it at http://valgrind.org/support/bug_reports.html. $ grep 315 unistd*.h unistd_32.h:#define __NR_tee 315 unistd_64.h:#define __NR_sched_getattr 315 unistd_x32.h:#define __NR_sched_getattr (__X32_SYSCALL_BIT + 315) Does not seem relevant to my bug, but I saw it and it asked me to report.
*** This bug has been marked as a duplicate of bug 369029 ***