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kernel_xiaomi_raphael/kernel/trace
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Xiao Yang 7054f86f26 tracing: Fix the race between registering 'snapshot' event trigger and triggering 'snapshot' operation 
commit 0bbe7f719985efd9adb3454679ecef0984cb6800 upstream.

Traced event can trigger 'snapshot' operation(i.e. calls snapshot_trigger()
or snapshot_count_trigger()) when register_snapshot_trigger() has completed
registration but doesn't allocate buffer for 'snapshot' event trigger.  In
the rare case, 'snapshot' operation always detects the lack of allocated
buffer so make register_snapshot_trigger() allocate buffer first.

trigger-snapshot.tc in kselftest reproduces the issue on slow vm:
-----------------------------------------------------------
cat trace
...
ftracetest-3028  [002] ....   236.784290: sched_process_fork: comm=ftracetest pid=3028 child_comm=ftracetest child_pid=3036
     <...>-2875  [003] ....   240.460335: tracing_snapshot_instance_cond: *** SNAPSHOT NOT ALLOCATED ***
     <...>-2875  [003] ....   240.460338: tracing_snapshot_instance_cond: *** stopping trace here!   ***
-----------------------------------------------------------

Link: http://lkml.kernel.org/r/20200414015145.66236-1-yangx.jy@cn.fujitsu.com

Cc: stable@vger.kernel.org
Fixes: 93e31ffbf4 ("tracing: Add 'snapshot' event trigger command")
Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-04-24 08:00:56 +02:00
..
blktrace.c
tracing/blktrace: Fix to allow setting same value
2018-09-09 19:55:57 +02:00
bpf_trace.c
bpf: fix check of allowed specifiers in bpf_trace_printk
2018-12-17 09:28:50 +01:00
ftrace.c
ftrace: fpid_next() should increase position index
2020-02-28 16:36:07 +01:00
Kconfig
tracing: Prevent PROFILE_ALL_BRANCHES when FORTIFY_SOURCE=y
2018-02-22 15:42:13 +01:00
Makefile
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
power-traces.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ring_buffer_benchmark.c
ring-buffer: Have ring_buffer_alloc_read_page() return error on offline CPU
2017-08-02 14:23:02 -04:00
ring_buffer.c
trace: Fix preempt_enable_no_resched() abuse
2019-05-02 09:40:28 +02:00
rpm-traces.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_benchmark.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_benchmark.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_branch.c
Revert "x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP"
2019-07-03 13:15:57 +02:00
trace_clock.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h>
2017-03-02 08:42:27 +01:00
trace_entries.h
tracing: Fix missing tab for hwlat_detector print format
2018-04-29 11:33:17 +02:00
trace_event_perf.c
perf/ftrace: Fix double traces of perf on ftrace:function
2017-08-29 13:29:29 +02:00
trace_events_filter_test.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_events_filter.c
tracing: Fix regex_match_front() to not over compare the test string
2018-05-16 10:10:27 +02:00
trace_events_hist.c
tracing: Use strncpy instead of memcpy for string keys in hist triggers
2019-03-23 14:35:19 +01:00
trace_events_trigger.c
tracing: Fix the race between registering 'snapshot' event trigger and triggering 'snapshot' operation
2020-04-24 08:00:56 +02:00
trace_events.c
tracing: Fix lock inversion in trace_event_enable_tgid_record()
2020-01-09 10:17:56 +01:00
trace_export.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_functions_graph.c
tracing/fgraph: Fix set_graph_function from showing interrupts
2019-05-16 19:42:27 +02:00
trace_functions.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_hwlat.c
tracing/hwlat: Don't ignore outer-loop duration when calculating max_latency
2019-10-17 13:43:58 -07:00
trace_irqsoff.c
tracing/fgraph: Fix set_graph_function from showing interrupts
2019-05-16 19:42:27 +02:00
trace_kdb.c
tracing: Silence GCC 9 array bounds warning
2019-06-25 11:36:50 +08:00
trace_kprobe.c
ftrace/kprobe: Show the maxactive number on kprobe_events
2020-04-24 08:00:50 +02:00
trace_mmiotrace.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_nop.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_output.c
tracing: Reorder display of TGID to be after PID
2018-07-17 11:39:30 +02:00
trace_output.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_printk.c
tracing: Handle NULL formats in hold_module_trace_bprintk_format()
2016-06-20 09:46:12 -04:00
trace_probe.c
tracing: probeevent: Fix to support minus offset from symbol
2018-03-28 18:24:42 +02:00
trace_probe.h
tracing: probeevent: Fix to support minus offset from symbol
2018-03-28 18:24:42 +02:00
trace_sched_switch.c
tracing: Fix sched switch start/stop refcount racy updates
2020-02-14 16:32:07 -05:00
trace_sched_wakeup.c
kernel/trace: Fix do not unregister tracepoints when register sched_migrate_task fail
2020-01-14 20:05:40 +01:00
trace_selftest_dynamic.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_selftest.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_seq.c
…
trace_stack.c
tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined
2020-01-14 20:05:40 +01:00
trace_stat.c
tracing: Fix very unlikely race of registering two stat tracers
2020-02-28 16:35:58 +01:00
trace_stat.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_syscalls.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_uprobe.c
tracing/uprobes: Fix output for multiple string arguments
2019-02-20 10:20:53 +01:00
trace.c
tracing: Disable trace_printk() on post poned tests
2020-03-11 18:02:50 +01:00
trace.h
ftrace: Protect ftrace_graph_hash with ftrace_sync
2020-02-14 16:32:13 -05:00
tracing_map.c
tracing: Have the histogram compare functions convert to u64 first
2020-01-09 10:17:56 +01:00
tracing_map.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00