Steven Rostedt d4d34b981a ftrace: Fix hash record accounting bug ... If the set_ftrace_filter is cleared by writing just whitespace to it, then the filter hash refcounts will be decremented but not updated. This causes two bugs: 1) No functions will be enabled for tracing when they all should be 2) If the users clears the set_ftrace_filter twice, it will crash ftrace: ------------[ cut here ]------------ WARNING: at /home/rostedt/work/git/linux-trace.git/kernel/trace/ftrace.c:1384 __ftrace_hash_rec_update.part.27+0x157/0x1a7() Modules linked in: Pid: 2330, comm: bash Not tainted 3.1.0-test+ #32 Call Trace: [<ffffffff81051828>] warn_slowpath_common+0x83/0x9b [<ffffffff8105185a>] warn_slowpath_null+0x1a/0x1c [<ffffffff810ba362>] __ftrace_hash_rec_update.part.27+0x157/0x1a7 [<ffffffff810ba6e8>] ? ftrace_regex_release+0xa7/0x10f [<ffffffff8111bdfe>] ? kfree+0xe5/0x115 [<ffffffff810ba51e>] ftrace_hash_move+0x2e/0x151 [<ffffffff810ba6fb>] ftrace_regex_release+0xba/0x10f [<ffffffff8112e49a>] fput+0xfd/0x1c2 [<ffffffff8112b54c>] filp_close+0x6d/0x78 [<ffffffff8113a92d>] sys_dup3+0x197/0x1c1 [<ffffffff8113a9a6>] sys_dup2+0x4f/0x54 [<ffffffff8150cac2>] system_call_fastpath+0x16/0x1b ---[ end trace 77a3a7ee73794a02 ]--- Link: http://lkml.kernel.org/r/20111101141420.GA4918@debian Reported-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>		2011-11-07 13:48:05 -05:00
..
Kconfig	trace events: Update version number reference to new 3.x scheme for EVENT_POWER_TRACING_DEPRECATED	2011-07-25 09:37:21 +02:00
Makefile	tracing/filter: Add startup tests for events filter	2011-08-19 14:35:59 -04:00
blktrace.c	blktrace: add FLUSH/FUA support	2011-08-11 10:36:05 +02:00
ftrace.c	ftrace: Fix hash record accounting bug	2011-11-07 13:48:05 -05:00
power-traces.c	perf: Clean up power events by introducing new, more generic ones	2011-01-04 08:16:54 +01:00
ring_buffer.c	trace: Add ring buffer stats to measure rate of events	2011-08-30 12:27:45 -04:00
ring_buffer_benchmark.c	tracing: Use NUMA allocation for per-cpu ring buffer pages	2011-06-14 22:04:39 -04:00
trace.c	tracing: Fix returning of duplicate data after EOF in trace_pipe_raw	2011-10-14 10:44:25 -04:00
trace.h	tracing: Warn on output if the function tracer was found corrupted	2011-10-11 09:13:25 -04:00
trace_branch.c	tracing: Allow events to share their print functions	2010-05-14 14:20:32 -04:00
trace_clock.c	tracing: Add a counter clock for those that do not trust clocks	2011-09-19 11:35:58 -04:00
trace_entries.h	tracing: Have dynamic size event stack traces	2011-07-14 16:36:53 -04:00
trace_event_perf.c	tracing: New flag to allow non privileged users to use a trace event	2010-11-18 14:37:40 +01:00
trace_events.c	tracing: fix event_subsystem ref counting	2011-10-31 13:59:23 -04:00
trace_events_filter.c	tracing: Add boiler plate for subsystem filter	2011-11-04 21:25:36 -04:00
trace_events_filter_test.h	tracing/filter: Add startup tests for events filter	2011-08-19 14:35:59 -04:00
trace_export.c	tracing: Replace trace_event struct array with pointer array	2011-02-02 21:37:13 -05:00
trace_functions.c	ftrace: Fix regression of :mod:module function enabling	2011-07-07 11:30:08 -04:00
trace_functions_graph.c	tracing: Still trace filtered irq functions when irq trace is disabled	2011-07-07 22:26:27 -04:00
trace_irqsoff.c	tracing: Fix preemptirqsoff tracer to not stop at preempt off	2011-09-22 11:11:51 -04:00
trace_kdb.c	kdb,ftdump: Remove reference to internal kdb include	2010-10-22 15:34:11 -05:00
trace_kprobe.c	ftrace/kprobes: Fix not to delete probes if in use	2011-10-10 15:13:03 -04:00
trace_mmiotrace.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
trace_nop.c	tracing/ftrace: make nop-tracer use polling wait for events on pipe	2009-03-23 09:22:15 +01:00
trace_output.c	tracing: Have dynamic size event stack traces	2011-07-14 16:36:53 -04:00
trace_output.h	tracing: Allow events to share their print functions	2010-05-14 14:20:32 -04:00
trace_printk.c	tracing: Clean up tb_fmt to not give faulty compile warning	2011-08-10 20:36:32 -04:00
trace_sched_switch.c	tracing: Remove obsolete sched_switch tracer	2011-02-08 17:14:56 -05:00
trace_sched_wakeup.c	tracing, function_graph: Remove dependency of abstime and duration fields on latency	2011-06-14 22:48:47 -04:00
trace_selftest.c	ftrace: Add self-tests for multiple function trace users	2011-05-18 19:24:51 -04:00
trace_selftest_dynamic.c	ftrace: Add self-tests for multiple function trace users	2011-05-18 19:24:51 -04:00
trace_stack.c	tracing: Convert to kstrtoul_from_user	2011-06-14 22:48:50 -04:00
trace_stat.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
trace_stat.h	tracing/stat: Add stat_release() callback	2009-07-10 12:14:05 +02:00
trace_syscalls.c	tracing/syscalls: Early terminate search for sys_ni_syscall	2011-02-07 21:30:14 -05:00
trace_workqueue.c	jump label: Initialize workqueue tracepoints *before* they are registered	2010-09-22 16:30:03 -04:00