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Lai Jiangshan 4f48f8b7fd tracing: Fix circular dead lock in stack trace 
When we cat <debugfs>/tracing/stack_trace, we may cause circular lock:
sys_read()
  t_start()
     arch_spin_lock(&max_stack_lock);

  t_show()
     seq_printf(), vsnprintf() .... /* they are all trace-able,
       when they are traced, max_stack_lock may be required again. */

The following script can trigger this circular dead lock very easy:
#!/bin/bash

echo 1 > /proc/sys/kernel/stack_tracer_enabled

mount -t debugfs xxx /mnt > /dev/null 2>&1

(
# make check_stack() zealous to require max_stack_lock
for ((; ;))
{
	echo 1 > /mnt/tracing/stack_max_size
}
) &

for ((; ;))
{
	cat /mnt/tracing/stack_trace > /dev/null
}

To fix this bug, we increase the percpu trace_active before
require the lock.

Reported-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <4B67D4F9.9080905@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2010-02-02 10:20:18 -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
vt: introduce and use vt_kmsg_redirect() function
2009-12-15 08:53:28 -08:00
time
clocksource: Prevent potential kgdb dead lock
2010-01-26 14:53:16 +01:00
trace
tracing: Fix circular dead lock in stack trace
2010-02-02 10:20:18 -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
cgroups: fix 2.6.32 regression causing BUG_ON() in cgroup_diput()
2010-01-11 09:34:05 -08:00
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
creds_are_invalid() needs to be exported for use by modules:
2009-09-23 11:02:26 -07:00
delayacct.c
headers: taskstats_kern.h trim
2009-09-18 09:48:52 -07:00
dma.c
…
exec_domain.c
…
exit.c
do_wait() optimization: do not place sub-threads on task_struct->children list
2009-12-17 15:45:31 -08:00
extable.c
…
fork.c
sched: Fix fork vs hotplug vs cpuset namespaces
2010-01-21 23:25:31 +01:00
freezer.c
…
futex_compat.c
futex: Fix compat_futex to be same as futex for REQUEUE_PI
2009-08-10 15:41:12 +02:00
futex.c
futexes: Remove rw parameter from get_futex_key()
2010-01-13 09:17:36 +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, hw_breakpoint, kgdb: Do not take mutex for kernel debugger
2010-01-30 08:42:21 +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: document everywhere that size has to be power of two
2010-01-16 12:15:38 -08:00
kgdb.c
x86, hw_breakpoints, kgdb: Fix kgdb to use hw_breakpoint API
2010-01-30 08:42:20 +01:00
kmod.c
kmod: fix resource leak in call_usermodehelper_pipe()
2010-01-11 09:34:04 -08:00
kprobes.c
kprobes: Fix distinct type warning
2009-12-28 10:25:31 +01:00
ksysfs.c
kexec: premit reduction of the reserved memory size
2009-12-16 07:20:13 -08:00
kthread.c
sched: Move kthread_bind() back to kthread.c
2009-12-16 19:01:57 +01:00
latencytop.c
…
lockdep_internals.h
…
lockdep_proc.c
seq_file: constify seq_operations
2009-09-23 07:39:29 -07:00
lockdep_states.h
…
lockdep.c
lockdep: Fix check_usage_backwards() error message
2010-01-27 08:34:02 +01:00
Makefile
Merge branch 'kvm-updates/2.6.33' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2009-12-08 08:02:38 -08:00
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
kprobes: Fix to add __kprobes to notify_die
2009-08-30 03:08:26 +02:00
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
…
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
perf: Honour event state for aux stream data
2010-01-21 13:40:40 +01:00
pid_namespace.c
pidns: deny CLONE_PARENT|CLONE_NEWPID combination
2009-09-24 07:21:04 -07:00
pid.c
pid: reduce code size by using a pointer to iterate over array
2009-12-16 07:20:12 -08:00
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
time: Introduce CLOCK_REALTIME_COARSE
2009-08-21 21:43:46 +02:00
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: __ptrace_detach: do __wake_up_parent() if we reap the tracee
2009-09-24 07:20:59 -07:00
rcupdate.c
rcu: Re-arrange code to reduce #ifdef pain
2009-11-22 18:58:16 +01:00
rcutiny.c
rcu: Eliminate unneeded function wrapping
2009-11-22 18:58:16 +01:00
rcutorture.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2009-12-14 09:58:24 -08:00
rcutree_plugin.h
rcu: Add expedited grace-period support for preemptible RCU
2009-12-03 11:35:25 +01:00
rcutree_trace.c
rcu: Add expedited grace-period support for preemptible RCU
2009-12-03 11:35:25 +01:00
rcutree.c
rcu: Add expedited grace-period support for preemptible RCU
2009-12-03 11:35:25 +01:00
rcutree.h
rcu: Add expedited grace-period support for preemptible RCU
2009-12-03 11:35:25 +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
resources: fix call to alignf() in allocate_resource()
2009-12-21 10:42:29 -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: Convert cpupri lock to raw_spinlock
2009-12-14 23:55:33 +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 vmark regression on big machines
2010-01-21 13:39:03 +01:00
sched_features.h
sched: Discard some old bits
2009-12-09 10:03:07 +01:00
sched_idletask.c
sched: Restore printk sanity
2009-12-20 19:05:02 +01:00
sched_rt.c
sched: Add pre and post wakeup hooks
2009-12-16 19:01:58 +01:00
sched_stats.h
…
sched.c
sched: Fix fork vs hotplug vs cpuset namespaces
2010-01-21 23:25:31 +01:00
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
smp_call_function_any(): pass the node value to cpumask_of_node()
2010-01-16 12:15:39 -08:00
softirq.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2009-12-14 09:58:24 -08:00
softlockup.c
percpu: make percpu symbols under kernel/ and mm/ unique
2009-10-29 22:34:13 +09:00
spinlock.c
locking: Cleanup the name space completely
2009-12-14 23:55:33 +01:00
srcu.c
rcu: Add synchronize_srcu_expedited()
2009-10-26 09:40:30 +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 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-12-19 09:47:34 -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
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6
2009-12-17 16:58:26 -08:00
taskstats.c
…
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
uids: Prevent tear down race
2009-11-02 16:02:39 +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