Module Name: src
Committed By: thorpej
Date: Thu Apr 30 04:18:07 UTC 2020
Modified Files:
src/sys/uvm: uvm_map.c
src/tests/lib/libc/sys: t_futex_ops.c
Log Message:
- In uvm_voaddr_acquire(), take an extra hold on the anon lock obj.
- In uvm_voaddr_release(), if the anon ref count drops to 0, call
uvm_anfree() rather than uvm_anon_release(). Unconditionally drop
the anon lock, and release the extra hold on the anon lock obj.
Fixes a panic that occurs if the backing store for a futex backed by
an anon memory location is unmapped while a thread is waiting in the
futex.
Add a test case that reproduced the panic to verify that it's fixed.
To generate a diff of this commit:
cvs rdiff -u -r1.381 -r1.382 src/sys/uvm/uvm_map.c
cvs rdiff -u -r1.2 -r1.3 src/tests/lib/libc/sys/t_futex_ops.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
