On Fri, Mar 11, 2022 at 12:24:19PM -0700, Mark Kettenis wrote: > CVSROOT: /cvs > Module name: src > Changes by: kette...@cvs.openbsd.org 2022/03/11 12:24:19 > > Modified files: > sys/uvm : uvm_extern.h uvm_glue.c uvm_io.c uvm_map.c > uvm_map.h > > Log message: > Hold a read lock on the map while copying out data during a sysctl(2) call > to prevent another thread from unmapping the memory and triggering > an assertion or even corrupting random physical memory pages. > > This fix is similar to the change in uvm_glue.c rev. 1.74. However in this > case we need to be careful since some sysctl(2) calls look at the map of > the current process. In those cases we must not attempt to lock the map > again. > > ok mpi@ > > Should fix: > Reported-by: syzbot+be89fe83d6c004fcb...@syzkaller.appspotmail.com
With this applied, my amd64 laptop hangs while starting xenodm. Will try a witness kernel.
