CVSROOT: /cvs
Module name: src
Changes by: chel...@cvs.openbsd.org 2023/07/12 12:40:06
Modified files:
sys/kern : subr_suspend.c
Log message:
GPROF: sleep_state: disable _mcount() across suspend/resume
Something in the amd64 resume path doesn't agree with _mcount(), so
suspend/resume always fails if gmoninit is non-zero. It would be nice
if GPROF kernels didn't crash during resume.
In sleep_state(), (1) clear gmoninit after sched_stop_secondary_cpus()
so the primary CPU isn't racing sysctl(2) on another CPU, and (2)
restore gmoninit just after resume_mp() so the secondary CPUs are out
of cpu_hatch() and away from whatever is causing the crash before
_mcount() is reenabled.
Lots of input from claudio@, deraadt@, and kettenis@.
Thread 1: https://marc.info/?l=openbsd-tech&m=168721453821801&w=2
Thread 2: https://marc.info/?l=openbsd-tech&m=168892518722935&w=2
ok kettenis@ deraadt@
