superrob1500
/
mirror-linux
mirror of https://github.com/torvalds/linux
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
mirror-linux/kernel/trace
History
Steven Rostedt (Google) 8479f5ca8b tracing: Stop current tracer when resizing buffer 
[ Upstream commit d78ab79270 ]

When the ring buffer is being resized, it can cause side effects to the
running tracer. For instance, there's a race with irqsoff tracer that
swaps individual per cpu buffers between the main buffer and the snapshot
buffer. The resize operation modifies the main buffer and then the
snapshot buffer. If a swap happens in between those two operations it will
break the tracer.

Simply stop the running tracer before resizing the buffers and enable it
again when finished.

Link: https://lkml.kernel.org/r/20231205220010.748996423@goodmis.org

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Fixes: 3928a8a2d9 ("ftrace: make work with new ring buffer")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2023-12-13 18:39:23 +01:00
..
rv rv/monitor: Add __init/__exit annotations to module init/exit funcs 2022-09-26 18:10:51 -04:00
Kconfig tracing: Fix complicated dependency of CONFIG_TRACER_MAX_TRACE 2023-01-07 11:11:48 +01:00
Makefile rv: Add Runtime Verification (RV) interface 2022-07-30 14:01:28 -04:00
blktrace.c trace/blktrace: fix memory leak with using debugfs_lookup() 2023-03-10 09:33:46 +01:00
bpf_trace.c fprobe: Pass entry_data to handlers 2023-10-25 12:03:12 +02:00
bpf_trace.h
…
error_report-traces.c
…
fgraph.c arm64 fixes for 5.19-rc1: 2022-06-03 14:05:34 -07:00
fprobe.c fprobe: Fix to ensure the number of active retprobes is not zero 2023-10-25 12:03:12 +02:00
ftrace.c ftrace: Fix possible warning on checking all pages used in ftrace_process_locs() 2023-07-23 13:49:44 +02:00
ftrace_internal.h
…
kprobe_event_gen_test.c tracing: Fix wrong return in kprobe_event_gen_test.c 2023-04-06 12:10:41 +02:00
pid_list.c tracing: Cleanup double word in comment 2022-04-26 17:58:50 -04:00
pid_list.h
…
power-traces.c
…
preemptirq_delay_test.c
…
rethook.c rethook: Use __rcu pointer for rethook::handler 2023-12-13 18:39:17 +01:00
ring_buffer.c ring-buffer: Force absolute timestamp on discard of event 2023-12-13 18:39:23 +01:00
ring_buffer_benchmark.c
…
rpm-traces.c
…
synth_event_gen_test.c tracing: Fix memory leak in test_gen_synth_cmd() and test_empty_synth_event() 2022-11-17 17:51:38 -05:00
trace.c tracing: Stop current tracer when resizing buffer 2023-12-13 18:39:23 +01:00
trace.h tracing: Have trace_event_file have ref counters 2023-11-28 17:07:23 +00:00
trace_benchmark.c tracing: Add numeric delta time to the trace event benchmark 2022-09-26 13:01:09 -04:00
trace_benchmark.h tracing: Add numeric delta time to the trace event benchmark 2022-09-26 13:01:09 -04:00
trace_boot.c tracing: Initialize integer variable to prevent garbage return value 2022-05-26 21:13:00 -04:00
trace_branch.c
…
trace_clock.c
…
trace_dynevent.c tracing: Free buffers when a used dynamic event is removed 2022-11-23 19:07:12 -05:00
trace_dynevent.h
…
trace_entries.h
…
trace_eprobe.c kernel/trace: Fix cleanup logic of enable_trace_eprobe 2023-07-23 13:49:24 +02:00
trace_event_perf.c tracing/perf: Fix double put of trace event when init fails 2022-08-21 15:56:07 -04:00
trace_events.c tracing: Have trace_event_file have ref counters 2023-11-28 17:07:23 +00:00
trace_events_filter.c tracing: Have trace_event_file have ref counters 2023-11-28 17:07:23 +00:00
trace_events_filter_test.h
…
trace_events_hist.c tracing: Allow synthetic events to pass around stacktraces 2023-08-03 10:23:55 +02:00
trace_events_inject.c tracing: Have event inject files inc the trace array ref count 2023-09-23 11:11:11 +02:00
trace_events_synth.c tracing: Have the user copy of synthetic event address use correct context 2023-11-28 17:07:13 +00:00
trace_events_trigger.c tracing: Fix to check event_mutex is held while accessing trigger list 2022-09-06 22:26:00 -04:00
trace_events_user.c tracing/user_events: Fix struct arg size match check 2023-07-23 13:49:47 +02:00
trace_export.c tracing: Fix TASK_COMM_LEN in trace event format file 2023-02-14 19:11:54 +01:00
trace_functions.c
…
trace_functions_graph.c
…
trace_hwlat.c tracing: Remove extra space at the end of hwlat_detector/mode 2023-09-13 09:42:57 +02:00
trace_irqsoff.c tracing: Fix memleak due to race between current_tracer and trace 2023-08-30 16:11:00 +02:00
trace_kdb.c
…
trace_kprobe.c tracing/kprobes: Fix the order of argument descriptions 2023-11-20 11:52:18 +01:00
trace_kprobe_selftest.c
…
trace_kprobe_selftest.h
…
trace_mmiotrace.c
…
trace_nop.c
…
trace_osnoise.c tracing/timerlat: Always wakeup the timerlat thread 2023-06-09 10:34:24 +02:00
trace_output.c tracing: Make sure trace_printk() can output as soon as it can be used 2023-02-01 08:34:37 +01:00
trace_output.h
…
trace_preemptirq.c tracing: hold caller_addr to hardirq_{enable,disable}_ip 2022-09-06 22:26:00 -04:00
trace_printk.c
…
trace_probe.c Revert "tracing: Add "(fault)" name injection to kernel probes" 2023-08-03 10:23:55 +02:00
trace_probe.h tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols 2023-10-25 12:03:16 +02:00
trace_probe_kernel.h tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails 2023-08-03 10:23:55 +02:00
trace_probe_tmpl.h tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails 2023-08-03 10:23:55 +02:00
trace_recursion_record.c tracing: Use trace_create_file() to simplify creation of tracefs entries 2022-05-26 21:12:52 -04:00
trace_sched_switch.c sched/tracing: Append prev_state to tp args instead 2022-05-12 00:37:11 +02:00
trace_sched_wakeup.c tracing: Fix memleak due to race between current_tracer and trace 2023-08-30 16:11:00 +02:00
trace_selftest.c tracing: Reset the function filter after completing trampoline/graph selftest 2022-05-25 16:57:37 -04:00
trace_selftest_dynamic.c
…
trace_seq.c
…
trace_stack.c
…
trace_stat.c
…
trace_stat.h
…
trace_synth.h tracing: Allow synthetic events to pass around stacktraces 2023-08-03 10:23:55 +02:00
trace_syscalls.c tracing: Remove unused __bad_type_size() method 2022-11-17 20:21:06 -05:00
trace_uprobe.c bpf: Clear the probe_addr for uprobe 2023-09-13 09:42:30 +02:00
tracing_map.c tracing: Remove unused variable 'dups' 2022-10-03 12:20:31 -04:00
tracing_map.h
…