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/freebsd/sys/amd64/amd64/
H A Dvm_machdep.cdiff f236378b54c04bb62a1cc528f4d8daa6e68252b9 Tue Oct 31 12:51:34 CET 2017 Tijl Coosemans <tijl@FreeBSD.org> Set the return address for stack entry points to zero.

Stack unwinders treat zero as a stop condition. The value on the stack can
be non-zero because thread stacks may be arbitrary memory provided via
pthread_attr_setstack(3) or may be recycled from previous threads.

Reference:
https://lists.freebsd.org/pipermail/freebsd-current/2017-August/066855.html
https://lists.freebsd.org/pipermail/freebsd-current/2017-October/067254.html

Discussed with: kib
MFC after: 1 week
/freebsd/sys/i386/i386/
H A Dvm_machdep.cdiff f236378b54c04bb62a1cc528f4d8daa6e68252b9 Tue Oct 31 12:51:34 CET 2017 Tijl Coosemans <tijl@FreeBSD.org> Set the return address for stack entry points to zero.

Stack unwinders treat zero as a stop condition. The value on the stack can
be non-zero because thread stacks may be arbitrary memory provided via
pthread_attr_setstack(3) or may be recycled from previous threads.

Reference:
https://lists.freebsd.org/pipermail/freebsd-current/2017-August/066855.html
https://lists.freebsd.org/pipermail/freebsd-current/2017-October/067254.html

Discussed with: kib
MFC after: 1 week