CVS commit: src/sys/kern

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Tue Jun  4 11:54:04 UTC 2019

Modified Files:
        src/sys/kern: kern_lwp.c kern_sig.c

Log Message:
Stop trying to inform debugger about events from an exiting child

Do not emit signals to parent for if a process is demising:

 - fork/vfork/similar
 - lwp created/exited
 - exec
 - syscall entry/exit

With these changes Go applications can be traced without a clash under
a debugger, at least without deadlocking always. The culprit reason was
an attempt to inform a debugger in the middle of exit1() call about
a dying LWP. Go applications perform exit(2) without collecting threads
first. Verified with GDB and picotrace-based utilities like sigtracer.

PR kern/53120
PR port-arm/51677
PR bin/54060
PR bin/49662
PR kern/52548


To generate a diff of this commit:
cvs rdiff -u -r1.201 -r1.202 src/sys/kern/kern_lwp.c
cvs rdiff -u -r1.358 -r1.359 src/sys/kern/kern_sig.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.