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Steven Rostedt 6d15f08e6d tracing: Do not register unsupported perf events 
commit ef7f38df89 upstream.

Synthetic events currently do not have a function to register perf events.
This leads to calling the tracepoint register functions with a NULL
function pointer which triggers:

 ------------[ cut here ]------------
 WARNING: kernel/tracepoint.c:175 at tracepoint_add_func+0x357/0x370, CPU#2: perf/2272
 Modules linked in: kvm_intel kvm irqbypass
 CPU: 2 UID: 0 PID: 2272 Comm: perf Not tainted 6.18.0-ftest-11964-ge022764176fc-dirty #323 PREEMPTLAZY
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014
 RIP: 0010:tracepoint_add_func+0x357/0x370
 Code: 28 9c e8 4c 0b f5 ff eb 0f 4c 89 f7 48 c7 c6 80 4d 28 9c e8 ab 89 f4 ff 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc <0f> 0b 49 c7 c6 ea ff ff ff e9 ee fe ff ff 0f 0b e9 f9 fe ff ff 0f
 RSP: 0018:ffffabc0c44d3c40 EFLAGS: 00010246
 RAX: 0000000000000001 RBX: ffff9380aa9e4060 RCX: 0000000000000000
 RDX: 000000000000000a RSI: ffffffff9e1d4a98 RDI: ffff937fcf5fd6c8
 RBP: 0000000000000001 R08: 0000000000000007 R09: ffff937fcf5fc780
 R10: 0000000000000003 R11: ffffffff9c193910 R12: 000000000000000a
 R13: ffffffff9e1e5888 R14: 0000000000000000 R15: ffffabc0c44d3c78
 FS:  00007f6202f5f340(0000) GS:ffff93819f00f000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 000055d3162281a8 CR3: 0000000106a56003 CR4: 0000000000172ef0
 Call Trace:
  <TASK>
  tracepoint_probe_register+0x5d/0x90
  synth_event_reg+0x3c/0x60
  perf_trace_event_init+0x204/0x340
  perf_trace_init+0x85/0xd0
  perf_tp_event_init+0x2e/0x50
  perf_try_init_event+0x6f/0x230
  ? perf_event_alloc+0x4bb/0xdc0
  perf_event_alloc+0x65a/0xdc0
  __se_sys_perf_event_open+0x290/0x9f0
  do_syscall_64+0x93/0x7b0
  ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
  ? trace_hardirqs_off+0x53/0xc0
  entry_SYSCALL_64_after_hwframe+0x76/0x7e

Instead, have the code return -ENODEV, which doesn't warn and has perf
error out with:

 # perf record -e synthetic:futex_wait
Error:
The sys_perf_event_open() syscall returned with 19 (No such device) for event (synthetic:futex_wait).
"dmesg | grep -i perf" may provide additional information.

Ideally perf should support synthetic events, but for now just fix the
warning. The support can come later.

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://patch.msgid.link/20251216182440.147e4453@gandalf.local.home
Fixes: 4b147936fa ("tracing: Add support for 'synthetic' events")
Reported-by: Ian Rogers <irogers@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2026-01-19 13:09:53 +01:00
..
blktrace.c
trace/blktrace: fix memory leak with using debugfs_lookup()
2023-03-10 09:39:47 +01:00
bpf_trace.c
bpf: Fix WARN() in get_bpf_raw_tp_regs
2025-06-27 11:05:13 +01:00
bpf_trace.h
…
error_report-traces.c
tracing: add error_report_end trace point
2021-02-26 09:41:02 -08:00
fgraph.c
tracing: Fix various typos in comments
2021-03-23 14:08:18 -04:00
ftrace_internal.h
…
ftrace.c
ftrace: Also allocate and copy hash for reading of filter files
2025-08-28 16:24:34 +02:00
Kconfig
tracing: Build event generation tests only as modules
2024-07-05 09:14:29 +02:00
kprobe_event_gen_test.c
tracing: Fix wrong return in kprobe_event_gen_test.c
2023-04-05 11:24:54 +02:00
Makefile
tracing: Place trace_pid_list logic into abstract functions
2022-07-29 17:25:29 +02:00
pid_list.c
tracing: Place trace_pid_list logic into abstract functions
2022-07-29 17:25:29 +02:00
pid_list.h
tracing: Place trace_pid_list logic into abstract functions
2022-07-29 17:25:29 +02:00
power-traces.c
…
preemptirq_delay_test.c
minmax: make generic MIN() and MAX() macros available everywhere
2025-10-19 16:21:52 +02:00
ring_buffer_benchmark.c
sched,tracing: Convert to sched_set_fifo()
2020-07-29 11:43:53 +02:00
ring_buffer.c
ring-buffer: Fix bytes_dropped calculation issue
2025-04-10 14:32:02 +02:00
rpm-traces.c
…
synth_event_gen_test.c
tracing / synthetic: Disable events after testing in synth_event_gen_test_init()
2024-01-05 15:13:35 +01:00
trace_benchmark.c
tracing: Fix some typos in comments
2020-11-10 20:39:40 -05:00
trace_benchmark.h
…
trace_boot.c
tracing: Initialize integer variable to prevent garbage return value
2022-06-09 10:23:21 +02:00
trace_branch.c
tracing: Merge irqflags + preempt counter.
2021-02-02 17:02:06 -05:00
trace_clock.c
tracing: Use atomic64_inc_return() in trace_clock_counter()
2024-12-14 19:51:40 +01:00
trace_dynevent.c
tracing: dynevent: Add a missing lockdown check on dynevent
2025-10-02 13:39:13 +02:00
trace_dynevent.h
tracing: probes: Fix a possible race in trace_probe_log APIs
2025-05-22 14:08:21 +02:00
trace_entries.h
trace: Add timerlat tracer
2021-06-25 19:57:24 -04:00
trace_eprobe.c
tracing/eprobe: Fix to release eprobe when failed to add dyn_event
2024-12-14 19:51:44 +01:00
trace_event_perf.c
trace/trace_event_perf: remove duplicate samples on the first tracepoint event
2024-12-14 19:51:00 +01:00
trace_events_filter_test.h
…
trace_events_filter.c
tracing: Fix filter string testing
2025-05-02 07:44:13 +02:00
trace_events_hist.c
tracing: Fix memory leaks in create_field_var()
2025-12-07 06:09:26 +09:00
trace_events_inject.c
tracing: Have event inject files inc the trace array ref count
2023-10-06 13:18:02 +02:00
trace_events_synth.c
tracing: Do not add length to print format in synthetic events
2025-10-02 13:38:59 +02:00
trace_events_trigger.c
ftrace: Fix preemption accounting for stacktrace trigger command
2025-05-22 14:08:25 +02:00
trace_events.c
tracing: Do not register unsupported perf events
2026-01-19 13:09:53 +01:00
trace_export.c
tracing: Fix some typos in comments
2020-11-10 20:39:40 -05:00
trace_functions_graph.c
tracing: Fix use-after-free in print_graph_function_flags during tracer switching
2025-04-10 14:32:06 +02:00
trace_functions.c
ftrace: Fix preemption accounting for stacktrace filter command
2025-05-22 14:08:25 +02:00
trace_hwlat.c
tracing/hwlat: Fix a race during cpuhp processing
2024-10-17 15:11:42 +02:00
trace_irqsoff.c
tracing: Fix use-after-free in print_graph_function_flags during tracer switching
2025-04-10 14:32:06 +02:00
trace_kdb.c
kdb: Rename members of struct kdbtab_t
2021-07-27 17:05:06 +01:00
trace_kprobe_selftest.c
…
trace_kprobe_selftest.h
…
trace_kprobe.c
tracing: Fix race condition in kprobe initialization causing NULL pointer dereference
2025-10-19 16:21:51 +02:00
trace_mmiotrace.c
tracing: Remove definition of DEBUG in trace_mmiotrace.c
2021-02-02 17:02:07 -05:00
trace_nop.c
…
trace_osnoise.c
tracing/osnoise: Fix possible recursive locking for cpus_read_lock()
2025-04-10 14:32:06 +02:00
trace_output.c
tracing: Remove precision vsnprintf() check from print event
2024-10-17 15:11:48 +02:00
trace_output.h
ftrace: Add recording of functions that caused recursion
2020-11-06 08:42:26 -05:00
trace_preemptirq.c
tracing: hold caller_addr to hardirq_{enable,disable}_ip
2022-09-20 12:39:43 +02:00
trace_printk.c
tracing: Disable "other" permission bits in the tracefs files
2021-11-18 19:16:15 +01:00
trace_probe_kernel.h
tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails
2023-08-03 10:22:31 +02:00
trace_probe_tmpl.h
tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails
2023-08-03 10:22:31 +02:00
trace_probe.c
tracing: probes: Fix a possible race in trace_probe_log APIs
2025-05-22 14:08:21 +02:00
trace_probe.h
tracing: Fix race condition in kprobe initialization causing NULL pointer dereference
2025-10-19 16:21:51 +02:00
trace_recursion_record.c
tracing: Disable "other" permission bits in the tracefs files
2021-11-18 19:16:15 +01:00
trace_sched_switch.c
…
trace_sched_wakeup.c
tracing: Fix use-after-free in print_graph_function_flags during tracer switching
2025-04-10 14:32:06 +02:00
trace_selftest_dynamic.c
…
trace_selftest.c
tracing: Fix various typos in comments
2021-03-23 14:08:18 -04:00
trace_seq.c
tracing: Fix various typos in comments
2021-03-23 14:08:18 -04:00
trace_stack.c
tracing: Disable "other" permission bits in the tracefs files
2021-11-18 19:16:15 +01:00
trace_stat.c
tracing: Disable "other" permission bits in the tracefs files
2021-11-18 19:16:15 +01:00
trace_stat.h
…
trace_synth.h
tracing: Allow synthetic events to pass around stacktraces
2023-08-03 10:22:30 +02:00
trace_syscalls.c
tracing: Make tp_printk work on syscall tracepoints
2022-06-14 18:36:14 +02:00
trace_uprobe.c
tracing: Fix race condition in kprobe initialization causing NULL pointer dereference
2025-10-19 16:21:51 +02:00
trace.c
tracing: Fix tracing_marker may trigger page fault during preempt_disable
2025-10-02 13:39:00 +02:00
trace.h
tracing: Limit access to parser->buffer when trace_get_user failed
2025-08-28 16:24:37 +02:00
tracing_map.c
tracing: Fix cmp_entries_dup() to respect sort() comparison rules
2024-12-14 19:51:31 +01:00
tracing_map.h
tracing: Fix some typos in comments
2020-11-10 20:39:40 -05:00