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From: Steven Rostedtrostedt@goodmis.org <rostedt@goodmis.org> CPU0 expires a posix-timer and runs the callback function. The signal is queued. After releasing the posix-timer lock and before returning to hrtimer_run_queue CPU0 gets interrupted. CPU1 delivers the queued signal and rearms the timer. CPU0 comes back to hrtimer_run_queue and sets the timer state to expired. The next modification of the timer can result in an oops, because the state information is wrong. Keep track of state = RUNNING and check if the state has been in the return path of hrtimer_run_queue. In case the state has been changed, ignore a restart request and do not touch the state variable. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> |
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.. | ||
irq | ||
power | ||
.gitignore | ||
acct.c | ||
audit.c | ||
auditsc.c | ||
capability.c | ||
compat.c | ||
configs.c | ||
cpu.c | ||
cpuset.c | ||
dma.c | ||
exec_domain.c | ||
exit.c | ||
extable.c | ||
fork.c | ||
futex.c | ||
hrtimer.c | ||
intermodule.c | ||
itimer.c | ||
kallsyms.c | ||
Kconfig.hz | ||
Kconfig.preempt | ||
kexec.c | ||
kfifo.c | ||
kmod.c | ||
kprobes.c | ||
ksysfs.c | ||
kthread.c | ||
Makefile | ||
module.c | ||
mutex-debug.c | ||
mutex-debug.h | ||
mutex.c | ||
mutex.h | ||
panic.c | ||
params.c | ||
pid.c | ||
posix-cpu-timers.c | ||
posix-timers.c | ||
printk.c | ||
profile.c | ||
ptrace.c | ||
rcupdate.c | ||
rcutorture.c | ||
resource.c | ||
sched.c | ||
seccomp.c | ||
signal.c | ||
softirq.c | ||
softlockup.c | ||
spinlock.c | ||
stop_machine.c | ||
sys.c | ||
sys_ni.c | ||
sysctl.c | ||
time.c | ||
timer.c | ||
uid16.c | ||
user.c | ||
wait.c | ||
workqueue.c |