git: kernel - Fix ps/thread-exit and other related ps races
commit eb2adbf513fa1db03b9e8e7b61fcaf511babd367
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Thu Nov 17 09:04:53 2011 -0800
kernel - Fix ps/thread-exit and other related ps races
* Adjust sysctl_kern_proc()'s kernel thread scanning code to use a marker
instead of depending on td remaining on its proper list. Otherwise
blocking conditions can rip td out from under us or move it to another
cpu, potentially resulting in a crash or livelock. Index the scan
backwards to avoid live-locking continuous adds to the list.
* Fix a potential race is the zombie removal code vs a ps, p->p_token was
being released too early.
* Adjust lwkt_exit() to wait for the thread's hold count to drop to zero
so lwkt_hold() works as advertised.
Summary of changes:
sys/ddb/db_ps.c | 2 +
sys/kern/kern_exit.c | 3 +-
sys/kern/kern_proc.c | 76 +++++++++++++++++++++++++++++++++++++++++-------
sys/kern/lwkt_thread.c | 11 +++++++
sys/sys/thread.h | 2 +-
5 files changed, 81 insertions(+), 13 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/eb2adbf513fa1db03b9e8e7b61fcaf511babd367
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