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Steven Rostedt e59494f441 ftrace: fix 4d3702b6 (post-v2.6.26): WARNING: at kernel/lockdep.c:2731 check_flags (ftrace) 
On Wed, 16 Jul 2008, Vegard Nossum wrote:

> When booting 4d3702b6, I got this huge thing:
>
> Testing tracer wakeup: <4>------------[ cut here ]------------
> WARNING: at kernel/lockdep.c:2731 check_flags+0x123/0x160()
> Modules linked in:
> Pid: 1, comm: swapper Not tainted 2.6.26-crashing-02127-g4d3702b6 #30
>  [<c015c349>] warn_on_slowpath+0x59/0xb0
>  [<c01276c6>] ? ftrace_call+0x5/0x8
>  [<c012d800>] ? native_read_tsc+0x0/0x20
>  [<c0158de2>] ? sub_preempt_count+0x12/0xf0
>  [<c01814eb>] ? trace_hardirqs_off+0xb/0x10
>  [<c0182fbc>] ? __lock_acquire+0x2cc/0x1120
>  [<c01814eb>] ? trace_hardirqs_off+0xb/0x10
>  [<c01276af>] ? mcount_call+0x5/0xa
>  [<c017ff53>] check_flags+0x123/0x160
>  [<c0183e61>] lock_acquire+0x51/0xd0
>  [<c01276c6>] ? ftrace_call+0x5/0x8
>  [<c0613d4f>] _spin_lock_irqsave+0x5f/0xa0
>  [<c01a8d45>] ? ftrace_record_ip+0xf5/0x220
>  [<c02d5413>] ? debug_locks_off+0x3/0x50
>  [<c01a8d45>] ftrace_record_ip+0xf5/0x220
>  [<c01276af>] mcount_call+0x5/0xa
>  [<c02d5418>] ? debug_locks_off+0x8/0x50
>  [<c017ff27>] check_flags+0xf7/0x160
>  [<c0183e61>] lock_acquire+0x51/0xd0
>  [<c01276c6>] ? ftrace_call+0x5/0x8
>  [<c0613d4f>] _spin_lock_irqsave+0x5f/0xa0
>  [<c01affcd>] ? wakeup_tracer_call+0x6d/0xf0
>  [<c01625e2>] ? _local_bh_enable+0x62/0xb0
>  [<c0158ddd>] ? sub_preempt_count+0xd/0xf0
>  [<c01affcd>] wakeup_tracer_call+0x6d/0xf0
>  [<c0162724>] ? __do_softirq+0xf4/0x110
>  [<c01afff1>] ? wakeup_tracer_call+0x91/0xf0
>  [<c01276c6>] ftrace_call+0x5/0x8
>  [<c0162724>] ? __do_softirq+0xf4/0x110
>  [<c0158de2>] ? sub_preempt_count+0x12/0xf0
>  [<c01625e2>] _local_bh_enable+0x62/0xb0
>  [<c0162724>] __do_softirq+0xf4/0x110
>  [<c01627ed>] do_softirq+0xad/0xb0
>  [<c0162a15>] irq_exit+0xa5/0xb0
>  [<c013a506>] smp_apic_timer_interrupt+0x66/0xa0
>  [<c02d3fac>] ? trace_hardirqs_off_thunk+0xc/0x10
>  [<c0127449>] apic_timer_interrupt+0x2d/0x34
>  [<c018007b>] ? find_usage_backwards+0xb/0xf0
>  [<c0613a09>] ? _spin_unlock_irqrestore+0x69/0x80
>  [<c014ef32>] tg_shares_up+0x132/0x1d0
>  [<c014d2a2>] walk_tg_tree+0x62/0xa0
>  [<c014ee00>] ? tg_shares_up+0x0/0x1d0
>  [<c014a860>] ? tg_nop+0x0/0x10
>  [<c015499d>] update_shares+0x5d/0x80
>  [<c0154a2f>] try_to_wake_up+0x6f/0x280
>  [<c01a8b90>] ? __ftrace_modify_code+0x0/0xc0
>  [<c01a8b90>] ? __ftrace_modify_code+0x0/0xc0
>  [<c0154c94>] wake_up_process+0x14/0x20
>  [<c01725f6>] kthread_create+0x66/0xb0
>  [<c0195400>] ? do_stop+0x0/0x200
>  [<c0195320>] ? __stop_machine_run+0x30/0xb0
>  [<c0195340>] __stop_machine_run+0x50/0xb0
>  [<c0195400>] ? do_stop+0x0/0x200
>  [<c01a8b90>] ? __ftrace_modify_code+0x0/0xc0
>  [<c061242d>] ? mutex_unlock+0xd/0x10
>  [<c01953cc>] stop_machine_run+0x2c/0x60
>  [<c01a94d3>] unregister_ftrace_function+0x103/0x180
>  [<c01b0517>] stop_wakeup_tracer+0x17/0x60
>  [<c01b056f>] wakeup_tracer_ctrl_update+0xf/0x30
>  [<c01ab8d5>] trace_selftest_startup_wakeup+0xb5/0x130
>  [<c01ab950>] ? trace_wakeup_test_thread+0x0/0x70
>  [<c01aadf5>] register_tracer+0x135/0x1b0
>  [<c0877d02>] init_wakeup_tracer+0xd/0xf
>  [<c085d437>] kernel_init+0x1a9/0x2ce
>  [<c061397b>] ? _spin_unlock_irq+0x3b/0x60
>  [<c02d3f9c>] ? trace_hardirqs_on_thunk+0xc/0x10
>  [<c0877cf5>] ? init_wakeup_tracer+0x0/0xf
>  [<c0182646>] ? trace_hardirqs_on_caller+0x126/0x180
>  [<c02d3f9c>] ? trace_hardirqs_on_thunk+0xc/0x10
>  [<c01269c8>] ? restore_nocheck_notrace+0x0/0xe
>  [<c085d28e>] ? kernel_init+0x0/0x2ce
>  [<c085d28e>] ? kernel_init+0x0/0x2ce
>  [<c01275fb>] kernel_thread_helper+0x7/0x10
>  =======================
> ---[ end trace a7919e7f17c0a725 ]---
> irq event stamp: 579530
> hardirqs last  enabled at (579528): [<c01826ab>] trace_hardirqs_on+0xb/0x10
> hardirqs last disabled at (579529): [<c01814eb>] trace_hardirqs_off+0xb/0x10
> softirqs last  enabled at (579530): [<c0162724>] __do_softirq+0xf4/0x110
> softirqs last disabled at (579517): [<c01627ed>] do_softirq+0xad/0xb0
> irq event stamp: 579530
> hardirqs last  enabled at (579528): [<c01826ab>] trace_hardirqs_on+0xb/0x10
> hardirqs last disabled at (579529): [<c01814eb>] trace_hardirqs_off+0xb/0x10
> softirqs last  enabled at (579530): [<c0162724>] __do_softirq+0xf4/0x110
> softirqs last disabled at (579517): [<c01627ed>] do_softirq+0xad/0xb0
> PASSED
>
> Incidentally, the kernel also hung while I was typing in this report.

Things get weird between lockdep and ftrace because ftrace can be called
within lockdep internal code (via the mcount pointer) and lockdep can be
called with ftrace (via spin_locks).

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Tested-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-18 13:47:15 +02:00
..
irq
genirq: remove extraneous checks in manage.c
2008-07-10 07:01:13 +02:00
power
Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
2008-07-16 17:25:46 -07:00
time
Merge branch 'generic-ipi' into generic-ipi-for-linus
2008-07-15 21:55:59 +02:00
trace
ftrace: fix 4d3702b6 (post-v2.6.26): WARNING: at kernel/lockdep.c:2731 check_flags (ftrace)
2008-07-18 13:47:15 +02:00
.gitignore
Update kernel/.gitignore with new auto-generated files
2008-02-09 23:27:01 -08:00
acct.c
bsd_acct: using task_struct->tgid is not right in pid-namespaces
2008-03-24 19:22:20 -07:00
audit_tree.c
[PATCH] list_for_each_rcu must die: audit
2008-05-17 03:30:23 -04:00
audit.c
[PATCH] remove useless argument type in audit_filter_user()
2008-06-24 23:36:35 -04:00
audit.h
[PATCH 1/2] audit: move extern declarations to audit.h
2008-04-28 06:28:04 -04:00
auditfilter.c
[PATCH] remove useless argument type in audit_filter_user()
2008-06-24 23:36:35 -04:00
auditsc.c
[PATCH] new predicate - AUDIT_FILETYPE
2008-04-28 06:28:37 -04:00
backtracetest.c
backtrace: replace timer with tasklet + completions
2008-06-27 18:09:16 +02:00
bounds.c
Add kbuild.h that contains common definitions for kbuild users
2008-04-29 08:06:29 -07:00
capability.c
security: filesystem capabilities: fix fragile setuid fixup code
2008-07-04 10:40:08 -07:00
cgroup_debug.c
CGroup API files: move "releasable" to cgroup_debug subsystem
2008-04-29 08:06:09 -07:00
cgroup.c
cgroups: remove node_ prefix_from ns subsystem
2008-05-24 09:56:14 -07:00
compat.c
ntp: support for TAI
2008-05-01 08:03:59 -07:00
configs.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
cpu.c
force offline the processor during hot-removal
2008-07-16 23:27:01 +02:00
cpuset.c
Merge commit 'v2.6.26' into sched/devel
2008-07-14 12:19:19 +02:00
delayacct.c
Add scaled time to taskstats based process accounting
2007-10-18 14:37:28 -07:00
dma.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
exec_domain.c
whitespace fixes: execution domains
2007-10-18 14:37:26 -07:00
exit.c
fix dangling zombie when new parent ignores children
2008-07-16 18:02:34 -07:00
extable.c
module: Don't report discarded init pages as kernel text.
2008-01-29 17:13:18 +11:00
fork.c
ptrace children revamp
2008-07-16 18:02:33 -07:00
futex_compat.c
futex_compat __user annotation
2008-03-30 14:18:41 -07:00
futex.c
futexes: fix fault handling in futex_lock_pi
2008-06-23 13:31:15 +02:00
hrtimer.c
Merge branch 'generic-ipi' into generic-ipi-for-linus
2008-07-15 21:55:59 +02:00
itimer.c
ITIMER_REAL: convert to use struct pid
2008-02-08 09:22:29 -08:00
kallsyms.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
Kconfig.hz
sched: high-res preemption tick
2008-01-25 21:08:29 +01:00
Kconfig.preempt
rcu: move PREEMPT_RCU config option back under PREEMPT
2008-03-10 18:01:20 -07:00
kexec.c
kexec: make extended crashkernel= syntax less confusing
2008-05-01 08:04:00 -07:00
kfifo.c
is_power_of_2: kernel/kfifo.c
2007-07-16 09:05:50 -07:00
kgdb.c
kgdb: sparse fix
2008-06-24 10:52:55 -05:00
kmod.c
[PATCH] split linux/file.h
2008-05-01 13:08:16 -04:00
kprobes.c
kernel/kprobes.c: Made kprobe_blacklist static.
2008-07-10 10:13:51 -07:00
ksysfs.c
Kobject: convert remaining kobject_unregister() to kobject_put()
2008-01-24 20:40:40 -08:00
kthread.c
Freezer: Introduce PF_FREEZER_NOSIG
2008-07-16 23:27:03 +02:00
latencytop.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
lockdep_internals.h
lockdep: add lock_class information to lock_chain and output it
2008-06-24 01:28:20 +02:00
lockdep_proc.c
lockdep: add lock_class information to lock_chain and output it
2008-06-24 01:28:20 +02:00
lockdep.c
Merge branch 'core/locking' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-14 14:55:13 -07:00
Makefile
ftrace: do not trace scheduler functions
2008-07-17 17:40:11 +02:00
marker.c
Markers - remove extra format argument
2008-05-23 22:25:27 +02:00
module.c
modules: proper cleanup of kobject without CONFIG_SYSFS
2008-05-23 13:09:33 +10:00
mutex-debug.c
mutex-debug: check mutex magic before owner
2008-05-16 16:53:35 +02:00
mutex-debug.h
…
mutex.c
__mutex_lock_common: use signal_pending_state()
2008-06-10 11:45:09 +02:00
mutex.h
…
notifier.c
ipc: re-enable msgmni automatic recomputing msgmni if set to negative
2008-04-29 08:06:13 -07:00
ns_cgroup.c
cgroups: kernel/ns_cgroup.c should #include <linux/nsproxy.h>
2008-04-29 08:06:07 -07:00
nsproxy.c
ipc: sysvsem: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC)
2008-04-29 08:06:14 -07:00
panic.c
Taint kernel after WARN_ON(condition)
2008-04-29 08:05:59 -07:00
params.c
Add new string functions strict_strto* and convert kernel params to use them
2008-02-08 09:22:41 -08:00
pid_namespace.c
pidns: make pid->level and pid_ns->level unsigned
2008-04-30 08:29:49 -07:00
pid.c
rcu: split list.h and move rcu-protected lists into rculist.h
2008-05-19 10:01:37 +02:00
pm_qos_params.c
pm_qos_params: BKL pushdown
2008-07-02 15:06:24 -06:00
posix-cpu-timers.c
posix-timers: print RT watchdog message
2008-05-24 18:49:22 +02:00
posix-timers.c
signals: join send_sigqueue() with send_group_sigqueue()
2008-04-30 08:29:36 -07:00
printk.c
Merge branch 'core/printk' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-14 15:27:43 -07:00
profile.c
on_each_cpu(): kill unused 'retry' parameter
2008-06-26 11:24:38 +02:00
ptrace.c
ptrace children revamp
2008-07-16 18:02:33 -07:00
rcuclassic.c
Merge branch 'core/rcu' into core/rcu-for-linus
2008-07-15 21:10:12 +02:00
rcupdate.c
Merge branch 'generic-ipi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-15 14:12:03 -07:00
rcupreempt_trace.c
rcu: remove duplicated include in kernel/rcupreempt_trace.c
2008-05-19 10:03:39 +02:00
rcupreempt.c
Merge branch 'core/rcu' into core/rcu-for-linus
2008-07-15 21:10:12 +02:00
rcutorture.c
rcu: make rcutorture even more vicious: invoke RCU readers from irq handlers (timers)
2008-06-26 09:24:33 +02:00
relay.c
splice: fix sendfile() issue with relay
2008-05-28 14:49:27 +02:00
res_counter.c
memcgroup: add the max_usage member on the res_counter
2008-04-29 08:06:10 -07:00
resource.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
rtmutex_common.h
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
rtmutex-debug.c
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
rtmutex-debug.h
…
rtmutex-tester.c
Driver core: change sysdev classes to use dynamic kobject names
2008-01-24 20:40:40 -08:00
rtmutex.c
hrtimer: more hrtimer_init_sleeper() fallout.
2008-02-13 15:45:36 +01:00
rtmutex.h
…
rwsem.c
sched: mark rwsem functions as __sched for wchan/profiling
2007-12-18 15:21:13 +01:00
sched_clock.c
Merge branch 'sched/clock' into sched/devel
2008-07-14 12:19:13 +02:00
sched_cpupri.c
sched: use a 2-d bitmap for searching lowest-pri CPU
2008-06-06 15:19:28 +02:00
sched_cpupri.h
sched: fix the cpuprio count really
2008-06-06 15:19:44 +02:00
sched_debug.c
sched: add full schedstats to /proc/sched_debug
2008-06-27 14:31:31 +02:00
sched_fair.c
sched: add avg-overlap support to RT tasks
2008-07-04 12:50:22 +02:00
sched_features.h
sched: bias effective_load() error towards failing wake_affine().
2008-06-27 14:31:47 +02:00
sched_idletask.c
sched: make rt_sched_class, idle_sched_class static
2008-05-05 23:56:17 +02:00
sched_rt.c
sched: make sched_{rt,fair}.c ifdefs more readable
2008-06-27 14:32:05 +02:00
sched_stats.h
sched: fix accounting in task delay accounting & migration
2008-07-04 12:50:23 +02:00
sched.c
Merge branch 'core/softirq' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-14 15:28:42 -07:00
seccomp.c
…
semaphore.c
mmiotrace broken in linux-next (8-bit writes only)
2008-07-01 10:14:06 +02:00
signal.c
posix timers: discard SI_TIMER signals on exec
2008-05-26 10:37:07 -07:00
smp.c
generic ipi function calls: wait on alloc failure fallback
2008-07-15 14:12:20 -07:00
softirq.c
Merge branch 'generic-ipi' into generic-ipi-for-linus
2008-07-15 21:55:59 +02:00
softlockup.c
softlockup: print a module list on being stuck
2008-07-05 08:51:24 +02:00
spinlock.c
ftrace: lockdep notrace annotations
2008-05-23 20:39:40 +02:00
srcu.c
make srcu_readers_active() static
2008-02-06 10:41:02 -08:00
stacktrace.c
stacktrace: fix modular build, export print_stack_trace and save_stack_trace
2008-06-30 09:20:55 +02:00
stop_machine.c
sched: add new API sched_setscheduler_nocheck: add a flag to control access checks
2008-06-23 22:57:56 +02:00
sys_ni.c
timerfd: new timerfd API
2008-02-05 09:44:07 -08:00
sys.c
sys_prctl(): fix return of uninitialized value
2008-05-24 09:56:13 -07:00
sysctl_check.c
constify tables in kernel/sysctl_check.c
2008-02-08 09:22:31 -08:00
sysctl.c
Merge branch 'core/rcu' into core/rcu-for-linus
2008-07-15 21:10:12 +02:00
taskstats.c
Use find_task_by_vpid in taskstats
2008-04-30 08:29:48 -07:00
test_kprobes.c
kprobes: kretprobe user entry-handler
2008-02-06 10:41:11 -08:00
time.c
Make constants in kernel/timeconst.h fixed 64 bits
2008-05-02 16:18:42 -07:00
timeconst.pl
Make constants in kernel/timeconst.h fixed 64 bits
2008-05-02 16:18:42 -07:00
timer.c
Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
2008-07-14 16:06:58 -07:00
tsacct.c
Add scaled time to taskstats based process accounting
2007-10-18 14:37:28 -07:00
uid16.c
asmlinkage_protect replaces prevent_tail_call
2008-04-10 17:28:26 -07:00
user_namespace.c
eCryptfs: make key module subsystem respect namespaces
2008-04-29 08:06:07 -07:00
user.c
alloc_uid: cleanup
2008-04-30 08:29:53 -07:00
utsname_sysctl.c
Isolate the UTS namespace's domainname and hostname back
2007-11-29 09:24:53 -08:00
utsname.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
wait.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
workqueue.c
Christoph has moved
2008-07-04 10:40:04 -07:00