Steven Rostedt (VMware) 2fd5a462eb ftrace: Move RCU is watching check after recursion check ... commit b40341fad6 upstream. The first thing that the ftrace function callback helper functions should do is to check for recursion. Peter Zijlstra found that when "rcu_is_watching()" had its notrace removed, it caused perf function tracing to crash. This is because the call of rcu_is_watching() is tested before function recursion is checked and and if it is traced, it will cause an infinite recursion loop. rcu_is_watching() should still stay notrace, but to prevent this should never had crashed in the first place. The recursion prevention must be the first thing done in callback functions. Link: https://lore.kernel.org/r/20200929112541.GM2628@hirez.programming.kicks-ass.net Cc: stable@vger.kernel.org Cc: Paul McKenney <paulmck@kernel.org> Fixes: c68c0fa293 ("ftrace: Have ftrace_ops_get_func() handle RCU and PER_CPU flags too") Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reported-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-10-07 08:00:05 +02:00
..
blktrace.c	blktrace: ensure our debugfs dir exists	2020-09-03 11:24:18 +02:00
bpf_trace.c	bpf: fix nested bpf tracepoints with per-cpu data	2019-07-03 13:14:48 +02:00
ftrace.c	ftrace: Move RCU is watching check after recursion check	2020-10-07 08:00:05 +02:00
Kconfig	Stop the ad-hoc games with -Wno-maybe-initialized	2020-05-20 08:18:45 +02:00
Makefile	tracing: Allow gcov profiling on only ftrace subsystem	2018-08-21 09:11:49 -04:00
power-traces.c
preemptirq_delay_test.c	tracing: Use trace_clock_local() for looping in preemptirq_delay_test.c	2018-10-17 15:35:33 -04:00
ring_buffer_benchmark.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
ring_buffer.c	ring-buffer: Zero out time extend if it is nested and not absolute	2020-06-30 23:17:17 -04:00
rpm-traces.c
trace_benchmark.c	rcu: Rename cond_resched_rcu_qs() to cond_resched_tasks_rcu_qs()	2018-05-15 10:27:29 -07:00
trace_benchmark.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_branch.c	Revert "x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP"	2019-07-03 13:14:41 +02:00
trace_clock.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
trace_entries.h	tracing: Set kernel_stack's caller size properly	2020-10-01 13:14:31 +02:00
trace_event_perf.c	tracing: Fix race in perf_trace_buf initialization	2019-10-29 09:20:03 +01:00
trace_events_filter_test.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_events_filter.c	tracing: Have error path in predicate_parse() free its allocated memory	2020-08-05 10:05:59 +02:00
trace_events_hist.c	tracing: fix double free	2020-10-01 13:14:53 +02:00
trace_events_trigger.c	tracing: Fix event trigger to accept redundant spaces	2020-06-30 23:17:17 -04:00
trace_events.c	tracing: Adding NULL checks for trace_array descriptor pointer	2020-10-01 13:14:27 +02:00
trace_export.c	tracing: Add trigger file for trace_markers tracefs/ftrace/print	2018-05-29 08:28:53 -04:00
trace_functions_graph.c	tracing/fgraph: Fix set_graph_function from showing interrupts	2018-12-08 12:59:07 +01:00
trace_functions.c
trace_hwlat.c	tracing/hwlat: Honor the tracing_cpumask	2020-08-21 11:05:33 +02:00
trace_irqsoff.c	tracing/fgraph: Fix set_graph_function from showing interrupts	2018-12-08 12:59:07 +01:00
trace_kdb.c	tracing: Silence GCC 9 array bounds warning	2019-06-25 11:35:52 +08:00
trace_kprobe_selftest.c	selftest/ftrace: Move kprobe selftest function to separate compile unit	2018-07-30 18:41:04 -04:00
trace_kprobe_selftest.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_kprobe.c	tracing/kprobes: Fix a double initialization typo	2020-05-14 07:57:16 +02:00
trace_mmiotrace.c
trace_nop.c
trace_output.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
trace_output.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_preemptirq.c	lockdep: fix order in trace_hardirqs_off_caller()	2020-10-01 13:14:50 +02:00
trace_printk.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
trace_probe.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
trace_probe.h	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
trace_sched_switch.c	tracing: Fix sched switch start/stop refcount racy updates	2020-02-11 04:33:55 -08:00
trace_sched_wakeup.c	kernel/trace: Fix do not unregister tracepoints when register sched_migrate_task fail	2020-01-14 20:06:59 +01:00
trace_selftest_dynamic.c
trace_selftest.c
trace_seq.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
trace_stack.c	tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined	2020-01-14 20:06:59 +01:00
trace_stat.c	tracing: Fix very unlikely race of registering two stat tracers	2020-02-24 08:34:39 +01:00
trace_stat.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_syscalls.c
trace_uprobe.c	tracing/uprobes: Fix output for multiple string arguments	2019-02-20 10:25:48 +01:00
trace.c	tracing: Use address-of operator on section symbols	2020-10-01 13:14:38 +02:00
trace.h	ftrace: Protect ftrace_graph_hash with ftrace_sync	2020-02-11 04:34:05 -08:00
tracing_map.c	tracing: Have the histogram compare functions convert to u64 first	2020-01-09 10:19:02 +01:00
tracing_map.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00