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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
..
bpf
bpf: Sync pending IRQ work before freeing ring buffer
2025-12-07 06:09:13 +09:00
cgroup
cgroup: split cgroup_destroy_wq into 3 workqueues
2025-10-02 13:39:05 +02:00
configs
drivers/char: remove /dev/kmem for good
2021-05-07 00:26:34 -07:00
debug
kdb: Do not assume write() callback available
2025-03-13 12:50:45 +01:00
dma
dma/pool: eliminate alloc_pages warning in atomic_pool_expand
2026-01-19 13:09:39 +01:00
entry
entry: Respect changes to system call number by trace_sys_enter()
2024-04-10 16:18:46 +02:00
events
uprobe: Do not emulate/sstep original instruction when ip is changed
2025-12-07 06:09:17 +09:00
futex
futex: Don't include process MM in futex key on no-MMU
2023-11-20 11:08:13 +01:00
gcov
gcov: add support for GCC 15
2025-12-07 06:09:29 +09:00
irq
genirq: Provide new interfaces for affinity hints
2025-10-02 13:39:03 +02:00
kcsan
kcsan: Turn report_filterlist_lock into a raw_spinlock
2024-12-14 19:51:35 +01:00
livepatch
livepatch: Match old_sympos 0 and 1 in klp_find_func()
2026-01-19 13:09:42 +01:00
locking
locking/spinlock/debug: Fix data-race in do_raw_write_lock
2026-01-19 13:09:19 +01:00
power
PM: sleep: console: Fix the black screen issue
2025-08-28 16:24:18 +02:00
printk
printk: Fix signed integer overflow when defining LOG_BUF_LEN_MAX
2025-03-13 12:50:17 +01:00
rcu
rcu: Protect ->defer_qs_iw_pending from data race
2025-08-28 16:24:20 +02:00
sched
sched/deadline: only set free_cpus for online runqueues
2026-01-19 13:09:41 +01:00
time
hrtimers: Unconditionally update target CPU base after offline timer migration
2025-10-02 13:39:04 +02:00
trace
tracing: Do not register unsupported perf events
2026-01-19 13:09:53 +01:00
.gitignore
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
acct.c
acct: block access to kernel internal filesystems
2025-03-13 12:50:54 +01:00
async.c
async: Introduce async_schedule_dev_nocall()
2024-02-23 08:54:25 +01:00
audit_fsnotify.c
fsnotify: make allow_dups a property of the group
2024-04-10 16:19:02 +02:00
audit_tree.c
fsnotify: pass flags argument to fsnotify_alloc_group()
2024-04-10 16:19:02 +02:00
audit_watch.c
fsnotify: pass flags argument to fsnotify_alloc_group()
2024-04-10 16:19:02 +02:00
audit.c
audit: Send netlink ACK before setting connection in auditd_set
2024-02-23 08:54:37 +01:00
audit.h
audit: log AUDIT_TIME_* records only from rules
2022-04-08 14:23:06 +02:00
auditfilter.c
ima: Avoid blocking in RCU read-side critical section
2024-07-18 13:07:34 +02:00
auditsc.c
audit: fix possible soft lockup in __audit_inode_child()
2023-09-19 12:22:39 +02:00
backtracetest.c
…
bounds.c
bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS
2024-05-02 16:24:50 +02:00
capability.c
…
cfi.c
cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle
2022-06-22 14:22:04 +02:00
compat.c
sched_getaffinity: don't assume 'cpumask_size()' is fully initialized
2023-04-05 11:24:53 +02:00
configs.c
…
context_tracking.c
…
cpu_pm.c
PM: cpu: Make notifier chain use a raw_spinlock_t
2021-08-16 18:55:32 +02:00
cpu.c
hrtimers: Handle CPU state correctly on hotplug
2025-01-23 17:16:02 +01:00
crash_core.c
kernel/crash_core: suppress unknown crashkernel parameter warning
2021-12-29 12:28:49 +01:00
crash_dump.c
…
cred.c
cred: switch to using atomic_long_t
2023-12-20 15:17:37 +01:00
delayacct.c
delayacct: Add sysctl to enable at runtime
2021-05-12 11:43:25 +02:00
dma.c
…
exec_domain.c
…
exit.c
perf: Fix sample vs do_exit()
2025-06-27 11:05:38 +01:00
extable.c
…
fail_function.c
kernel/fail_function: fix memory leak with using debugfs_lookup()
2023-03-11 13:57:38 +01:00
fork.c
copy_sighand: Handle architectures where sizeof(unsigned long) < sizeof(u64)
2025-10-19 16:21:44 +02:00
freezer.c
sched: Add get_current_state()
2021-06-18 11:43:08 +02:00
gen_kheaders.sh
kheaders: Ignore silly-rename files
2025-01-23 17:16:00 +01:00
groups.c
…
hung_task.c
hung_task: move hung_task sysctl interface to hung_task.c
2025-03-13 12:49:50 +01:00
iomem.c
…
irq_work.c
irq_work: Make irq_work_queue() NMI-safe again
2021-06-10 10:00:08 +02:00
jump_label.c
jump_label: Fix jump_label_text_reserved() vs __init
2021-07-05 10:46:20 +02:00
kallsyms.c
kallsyms: Make kallsyms_on_each_symbol generally available
2023-12-13 18:36:45 +01:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
locking/rwlock: Provide RT variant
2021-08-17 17:50:51 +02:00
Kconfig.preempt
sched/core: Disable CONFIG_SCHED_CORE by default
2021-06-28 22:43:05 +02:00
kcov.c
kcov: mark in_softirq_really() as __always_inline
2025-01-09 13:28:50 +01:00
kexec_core.c
kexec: fix a memory leak in crash_shrink_memory()
2023-07-23 13:46:52 +02:00
kexec_elf.c
kexec: initialize ELF lowest address to ULONG_MAX
2025-04-10 14:32:01 +02:00
kexec_file.c
kexec: support purgatories with .text.hot sections
2023-06-21 15:59:14 +02:00
kexec_internal.h
panic, kexec: make __crash_kexec() NMI safe
2023-04-20 12:13:57 +02:00
kexec.c
kernel: kexec: copy user-array safely
2023-11-28 16:56:16 +00:00
kheaders.c
kheaders: Use array declaration instead of char
2023-05-11 23:00:17 +09:00
kmod.c
modules: add CONFIG_MODPROBE_PATH
2021-05-07 00:26:33 -07:00
kprobes.c
kprobes: Fix to check symbol prefixes correctly
2024-08-19 05:45:42 +02:00
ksysfs.c
kexec: turn all kexec_mutex acquisitions into trylocks
2023-04-20 12:13:57 +02:00
kthread.c
kthread: unpark only parked kthread
2024-10-17 15:12:00 +02:00
latencytop.c
…
Makefile
futex: Move to kernel/futex/
2022-12-31 13:14:04 +01:00
module_signature.c
…
module_signing.c
…
module-internal.h
…
module.c
NFSD: Remove svc_serv_ops::svo_module
2024-04-10 16:19:01 +02:00
notifier.c
notifier: Remove atomic_notifier_call_chain_robust()
2021-08-16 18:55:32 +02:00
nsproxy.c
memcg: enable accounting for new namesapces and struct nsproxy
2021-09-03 09:58:12 -07:00
padata.c
padata: Reset next CPU when reorder sequence wraps around
2025-10-29 14:03:14 +01:00
panic.c
panic: Flush kernel log buffer at the end
2024-04-13 13:01:43 +02:00
params.c
module: ensure that kobject_put() is safe for module type kobjects
2025-05-18 08:20:37 +02:00
pid_namespace.c
zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING
2024-07-05 09:14:24 +02:00
pid.c
pid: Add a judgment for ns null in pid_nr_ns
2025-10-19 16:21:54 +02:00
profile.c
profiling: remove profile=sleep support
2024-08-19 05:45:39 +02:00
ptrace.c
ptrace: Reimplement PTRACE_KILL by always sending SIGKILL
2022-06-09 10:22:29 +02:00
range.c
…
reboot.c
kernel/reboot: emergency_restart: Set correct system_state
2023-11-28 16:56:31 +00:00
regset.c
…
relay.c
relayfs: fix out-of-bounds access in relay_file_read
2023-05-11 23:00:18 +09:00
resource_kunit.c
…
resource.c
resource: fix region_intersects() vs add_memory_driver_managed()
2024-10-17 15:11:59 +02:00
rseq.c
rseq: Fix segfault on registration when rseq_cs is non-zero
2025-07-17 18:30:55 +02:00
scftorture.c
scftorture: Forgive memory-allocation failure if KASAN
2023-09-23 11:09:55 +02:00
scs.c
scs: fix a wrong parameter in __scs_magic
2026-01-19 13:09:52 +01:00
seccomp.c
seccomp: Invalidate seccomp mode to catch death failures
2022-02-16 12:56:38 +01:00
signal.c
signal: Replace BUG_ON()s
2024-10-17 15:11:27 +02:00
smp.c
smp: Fix up and expand the smp_call_function_many() kerneldoc
2025-10-19 16:21:31 +02:00
smpboot.c
smpboot: Replace deprecated CPU-hotplug functions.
2021-08-10 14:57:42 +02:00
smpboot.h
…
softirq.c
lockdep: Fix wait context check on softirq for PREEMPT_RT
2025-06-04 14:37:55 +02:00
stackleak.c
gcc-plugins/stackleak: Use noinstr in favor of notrace
2022-02-23 12:03:07 +01:00
stacktrace.c
stacktrace: move filter_irq_stacks() to kernel/stacktrace.c
2022-04-13 20:59:28 +02:00
static_call_inline.c
x86/static-call: provide a way to do very early static-call updates
2024-12-19 18:07:22 +01:00
static_call.c
static_call: Don't make __static_call_return0 static
2022-04-13 20:59:28 +02:00
stop_machine.c
stop_machine: Add caller debug info to queue_stop_cpus_work
2021-03-23 16:01:58 +01:00
sys_ni.c
syscalls: fix compat_sys_io_pgetevents_time64 usage
2024-07-05 09:14:50 +02:00
sys.c
getrusage: use sig->stats_lock rather than lock_task_sighand()
2024-03-15 10:48:22 -04:00
sysctl-test.c
kernel/sysctl-test: Remove some casts which are no-longer required
2021-06-23 16:41:24 -06:00
sysctl.c
fs: move fs stat sysctls to file_table.c
2025-03-13 12:49:50 +01:00
task_work.c
task_work: Introduce task_work_cancel() again
2024-08-19 05:45:13 +02:00
taskstats.c
…
test_kprobes.c
…
torture.c
torture: Fix hang during kthread shutdown phase
2023-08-30 16:18:19 +02:00
tracepoint.c
tracepoint: Fix kerneldoc comments
2021-08-16 11:39:51 -04:00
tsacct.c
taskstats: Cleanup the use of task->exit_code
2022-01-27 11:05:35 +01:00
ucount.c
ucount: fix atomic_long_inc_below() argument type
2025-08-28 16:24:11 +02:00
uid16.c
…
uid16.h
…
umh.c
kernel/umh.c: fix some spelling mistakes
2021-05-07 00:26:34 -07:00
up.c
Merge tag 'locking-urgent-2021-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2021-05-09 13:07:03 -07:00
user_namespace.c
ucounts: Fix systemd LimitNPROC with private users regression
2022-03-08 19:12:42 +01:00
user-return-notifier.c
…
user.c
fs/epoll: use a per-cpu counter for user's watches count
2021-09-08 11:50:27 -07:00
usermode_driver.c
Merge branch 'work.namei' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2021-07-03 11:41:14 -07:00
utsname_sysctl.c
…
utsname.c
…
watch_queue.c
watch_queue: fix pipe accounting mismatch
2025-04-10 14:31:57 +02:00
watchdog_hld.c
watchdog/perf: properly initialize the turbo mode timestamp and rearm counter
2024-08-19 05:45:20 +02:00
watchdog.c
watchdog: move softlockup_panic back to early_param
2023-11-28 16:56:28 +00:00
workqueue_internal.h
workqueue: Assign a color to barrier work items
2021-08-17 07:49:10 -10:00
workqueue.c
workqueue: Improve scalability of workqueue watchdog touch
2024-09-12 11:07:52 +02:00