On Thu, Jul 12, 2012 at 6:36 AM, Matthew Dillon <[email protected]> wrote: > > commit ead166eb4dd3c39eebe6407577f577dee061c743 > Author: Matthew Dillon <[email protected]> > Date: Wed Jul 11 15:29:55 2012 -0700 > > kernel - Fix MP race in sysv semaphore code > > * Fix a serious MP race in the sysv semaphore code due to a lack of > protection of the semu* global structures. > > * The race occurs during semaphore allocation and deallocation vs ANY > exiting process (even if it does not use semaphores), potentially > leading to a live-lock in the semu_list scan code. > > The live-lock will prevent the cpu it occurs on from being able to > switch to another kernel or user thread. In the sample case it > stopped pagedaemon from running, creating a backlog in the I/O > subsystem which locked the computer up. > > Reported-by: Peter Avalos > > Summary of changes: > sys/kern/sysv_sem.c | 86 > +++++++++++++++++++++++++++++++++++---------------- > 1 files changed, 59 insertions(+), 27 deletions(-)
Grr, I think some header file changes are not committed. P_SYSVSEM is not defined. Best Regards, sephe -- Tomorrow Will Never Die
