Steven Rostedt 283740c619 tracing: Use same local variable when resetting the ring buffer ...

In the ftrace code that resets the ring buffer it references the
buffer with a local variable, but then uses the tr->buffer as the
parameter to reset. If the wakeup tracer is running, which can
switch the tr->buffer with the max saved buffer, this can break
the requirement of disabling the buffer before the reset.

   buffer = tr->buffer;
   ring_buffer_record_disable(buffer);
   synchronize_sched();
   __tracing_reset(tr->buffer, cpu);

If the tr->buffer is swapped, then the reset is not happening to the
buffer that was disabled. This will cause the ring buffer to fail.

Found with Li Zefan's ftrace_stress_test.

Cc: stable@kernel.org
Reported-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2010-03-12 20:29:20 -05:00

..

gcov

microblaze: Enable GCOV_PROFILE_ALL

2009-09-21 14:29:21 +02:00

irq

genirq: Convert irq_desc.lock to raw_spinlock

2009-12-14 23:55:33 +01:00

power

PM / Hibernate: Fix preallocating of memory

2010-02-26 20:39:13 +01:00

time

Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2010-03-01 08:48:25 -08:00

trace

tracing: Use same local variable when resetting the ring buffer

2010-03-12 20:29:20 -05:00

.gitignore

…

acct.c

bsdacct: fix uid/gid misreporting

2009-12-15 08:53:10 -08:00

async.c

…

audit_tree.c

fix more leaks in audit_tree.c tag_chunk()

2009-12-19 09:27:43 -08:00

audit_watch.c

Audit: reorganize struct audit_watch to save 8 bytes

2009-09-24 03:50:25 -04:00

audit.c

Audit: send signal info if selinux is disabled

2009-09-24 03:50:26 -04:00

audit.h

…

auditfilter.c

…

auditsc.c

Sanitize f_flags helpers

2009-12-22 12:27:34 -05:00

backtracetest.c

…

bounds.c

kbuild: move bounds.h to include/generated

2009-12-12 13:08:14 +01:00

capability.c

remove CONFIG_SECURITY_FILE_CAPABILITIES compile option

2009-11-24 15:06:47 +11:00

cgroup_freezer.c

cgroups: let ss->can_attach and ss->attach do whole threadgroups at a time

2009-09-24 07:20:58 -07:00

cgroup.c

sched, cgroups: Fix module export

2010-02-25 12:02:13 +01:00

compat.c

…

configs.c

…

cpu.c

sched: Correct printk whitespace in warning from cpu down task check

2010-01-28 06:59:55 +01:00

cpuset.c

sched: Fix balance vs hotplug race

2009-12-06 21:10:56 +01:00

cred-internals.h

…

cred.c

kernel/cred.c: use kmem_cache_free

2010-02-03 10:21:57 +11:00

delayacct.c

headers: taskstats_kern.h trim

2009-09-18 09:48:52 -07:00

dma.c

…

exec_domain.c

…

exit.c

sched: Use lockdep-based checking on rcu_dereference()

2010-02-25 10:34:26 +01:00

extable.c

…

fork.c

sched: Use lockdep-based checking on rcu_dereference()

2010-02-25 10:34:26 +01:00

freezer.c

sched: fix nr_uninterruptible accounting of frozen tasks really

2009-07-18 14:19:53 +02:00

futex_compat.c

futex: Protect pid lookup in compat code with RCU

2009-12-09 14:22:14 +01:00

futex.c

futex: Handle futex value corruption gracefully

2010-02-03 15:13:22 +01:00

groups.c

…

hrtimer.c

hrtimers: Convert to raw_spinlocks

2009-12-14 23:55:34 +01:00

hung_task.c

softlockup: Fix hung_task_check_count sysctl

2009-11-27 06:21:57 +01:00

hw_breakpoint.c

perf: Make bp_len type to u64 generic across the arch

2010-02-04 01:07:12 +01:00

itimer.c

itimers: Fix racy writes to cpu_itimer fields

2009-11-18 16:32:12 +01:00

kallsyms.c

hw-breakpoints: Fix broken hw-breakpoint sample module

2009-11-10 11:23:29 +01:00

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

mutex: Better control mutex adaptive spinning config

2009-12-03 11:50:11 +01:00

Kconfig.preempt

…

kexec.c

Merge git://git.infradead.org/~dwmw2/mtd-2.6.33

2010-01-24 10:31:34 -08:00

kfifo.c

kfifo: Don't use integer as NULL pointer

2010-02-16 15:11:08 -08:00

kgdb.c

Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2010-02-04 16:07:41 -08:00

kmod.c

kmod: fix resource leak in call_usermodehelper_pipe()

2010-01-11 09:34:04 -08:00

kprobes.c

kprobes: Add mcount to the kprobes blacklist

2010-02-15 05:45:49 +01:00

ksysfs.c

sched: Remove USER_SCHED

2010-01-21 13:40:18 +01:00

kthread.c

kthread, sched: Remove reference to kthread_create_on_cpu

2010-02-09 11:47:39 +01:00

latencytop.c

…

lockdep_internals.h

lockdep: BFS cleanup

2009-07-24 10:53:29 +02:00

lockdep_proc.c

seq_file: constify seq_operations

2009-09-23 07:39:29 -07:00

lockdep_states.h

…

lockdep.c

rcu: Make lockdep_rcu_dereference() message less alarmist

2010-02-26 08:20:46 +01:00

Makefile

padata: Generic parallelization/serialization interface

2010-01-06 19:47:10 +11:00

module.c

modules: Skip empty sections when exporting section notes

2010-01-06 01:11:29 -08:00

mutex-debug.c

headers: remove sched.h from interrupt.h

2009-10-11 11:20:58 -07:00

mutex-debug.h

locking: Implement new raw_spinlock

2009-12-14 23:55:32 +01:00

mutex.c

mutex: Better control mutex adaptive spinning config

2009-12-03 11:50:11 +01:00

mutex.h

…

notifier.c

sched: Use lockdep-based checking on rcu_dereference()

2010-02-25 10:34:26 +01:00

ns_cgroup.c

cgroups: let ss->can_attach and ss->attach do whole threadgroups at a time

2009-09-24 07:20:58 -07:00

nsproxy.c

…

padata.c

padata: Generic parallelization/serialization interface

2010-01-06 19:47:10 +11:00

panic.c

kmsg_dump: Dump on crash_kexec as well

2009-12-31 19:45:04 +00:00

params.c

tree-wide: convert open calls to remove spaces to skip_spaces() lib function

2009-12-15 08:53:32 -08:00

perf_event.c

Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2010-02-28 10:20:25 -08:00

pid_namespace.c

pidns: deny CLONE_PARENT|CLONE_NEWPID combination

2009-09-24 07:21:04 -07:00

pid.c

sched: Use lockdep-based checking on rcu_dereference()

2010-02-25 10:34:26 +01:00

pm_qos_params.c

pm_qos: clean up racy global "name" variable

2009-10-14 15:31:10 +02:00

posix-cpu-timers.c

posix-cpu-timers: optimize and document timer_create callback

2009-11-18 12:36:05 +01:00

posix-timers.c

posix-timers.c: Don't export local functions

2010-02-05 14:54:10 +01:00

printk.c

Merge git://git.infradead.org/~dwmw2/mtd-2.6.33

2010-01-24 10:31:34 -08:00

profile.c

kernel/profile.c: Switch /proc/irq/prof_cpu_mask to seq_file

2009-09-20 20:15:40 +02:00

ptrace.c

ptrace: Fix ptrace_regset() comments and diagnose errors specifically

2010-02-23 13:45:26 -08:00

rcupdate.c

rcu: Export rcu_scheduler_active

2010-02-26 08:20:46 +01:00

rcutiny.c

rcu: Eliminate unneeded function wrapping

2009-11-22 18:58:16 +01:00

rcutorture.c

rcu: Fix rcutorture mod_timer argument to delay one jiffy

2010-02-25 10:35:00 +01:00

rcutree_plugin.h

rcu: Fix accelerated GPs for last non-dynticked CPU

2010-02-27 09:53:53 +01:00

rcutree_trace.c

rcu: Stop overflowing signed integers

2010-02-25 10:34:57 +01:00

rcutree.c

rcu: Fix accelerated grace periods for last non-dynticked CPU

2010-02-27 09:53:52 +01:00

rcutree.h

rcu: Fix accelerated grace periods for last non-dynticked CPU

2010-02-27 09:53:52 +01:00

relay.c

const: constify remaining pipe_buf_operations

2009-12-16 07:20:05 -08:00

res_counter.c

memcg: some modification to softlimit under hierarchical memory reclaim.

2009-10-01 16:11:13 -07:00

resource.c

Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2010-02-28 10:38:45 -08:00

rtmutex_common.h

…

rtmutex-debug.c

sched: Convert pi_lock to raw_spinlock

2009-12-14 23:55:33 +01:00

rtmutex-debug.h

…

rtmutex-tester.c

…

rtmutex.c

rtmutes: Convert rtmutex.lock to raw_spinlock

2009-12-14 23:55:33 +01:00

rtmutex.h

…

rwsem.c

…

sched_clock.c

sched: Fix cpu_clock() in NMIs, on !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK

2009-12-15 09:04:36 +01:00

sched_cpupri.c

sched: Use for_each_bit

2010-02-02 06:58:27 +01:00

sched_cpupri.h

sched: Convert cpupri lock to raw_spinlock

2009-12-14 23:55:33 +01:00

sched_debug.c

sched: Convert rq->lock to raw_spinlock

2009-12-14 23:55:33 +01:00

sched_fair.c

sched: Fix SCHED_MC regression caused by change in sched cpu_power

2010-02-26 15:45:13 +01:00

sched_features.h

sched: Discard some old bits

2009-12-09 10:03:07 +01:00

sched_idletask.c

sched: Remove the sched_class load_balance methods

2010-01-21 13:40:09 +01:00

sched_rt.c

sched: Change usage of rt_rq->rt_se to rt_rq->tg->rt_se[cpu]

2010-02-04 09:57:32 +01:00

sched_stats.h

…

sched.c

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2010-02-28 10:31:01 -08:00

seccomp.c

…

semaphore.c

…

signal.c

kernel/signal.c: fix kernel information leak with print-fatal-signals=1

2010-01-11 09:34:05 -08:00

slow-work-debugfs.c

SLOW_WORK: Move slow_work's proc file to debugfs

2009-12-01 08:20:31 -08:00

slow-work.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/sysctl-2.6

2009-12-08 07:38:50 -08:00

slow-work.h

SLOW_WORK: Move slow_work's proc file to debugfs

2009-12-01 08:20:31 -08:00

smp.c

generic-ipi: Optimize accesses by using DEFINE_PER_CPU_SHARED_ALIGNED for IPI data

2010-01-18 09:02:59 +01:00

softirq.c

hrtimer, softirq: Fix hrtimer->softirq trampoline

2010-02-03 18:17:40 +01:00

softlockup.c

softlockup: Add sched_clock_tick() to avoid kernel warning on kgdb resume

2010-02-01 08:22:32 +01:00

spinlock.c

locking: Cleanup the name space completely

2009-12-14 23:55:33 +01:00

srcu.c

rcu: Introduce lockdep-based checking to RCU read-side primitives

2010-02-25 09:40:59 +01:00

stacktrace.c

…

stop_machine.c

…

sys_ni.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6

2009-12-08 07:55:01 -08:00

sys.c

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2010-02-28 10:31:01 -08:00

sysctl_binary.c

SYSCTL: Print binary sysctl warnings (nearly) only once

2009-12-23 21:00:20 +01:00

sysctl_check.c

ipv4 05/05: add sysctl to accept packets with local source addresses

2009-12-03 12:14:38 -08:00

sysctl.c

sparc: Support show_unhandled_signals.

2010-03-01 00:02:23 -08:00

taskstats.c

const: struct nla_policy

2010-02-18 14:30:18 -08:00

test_kprobes.c

…

time.c

Revert "time: Remove xtime_cache"

2009-12-22 14:10:37 -08:00

timeconst.pl

…

timer.c

perf: Fix perf_event_do_pending() fallback callsite

2010-01-21 13:40:39 +01:00

tracepoint.c

trivial: fix typo "to to" in multiple files

2009-09-21 15:14:55 +02:00

tsacct.c

…

uid16.c

headers: utsname.h redux

2009-09-23 18:13:10 -07:00

up.c

…

user_namespace.c

…

user-return-notifier.c

core: Clean up user return notifers use of per_cpu

2009-12-02 10:22:59 +01:00

user.c

sched: Remove USER_SCHED

2010-01-21 13:40:18 +01:00

utsname_sysctl.c

sysctl kernel: Remove binary sysctl logic

2009-11-12 02:04:55 -08:00

utsname.c

…

wait.c

locking, sched: Give waitqueue spinlocks their own lockdep classes

2009-08-10 14:43:09 +02:00

workqueue.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2009-12-10 09:35:44 -08:00