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Steven Rostedt 6819bc6285 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 13:11:51 +01:00
..
bpf
bpf: Sync pending IRQ work before freeing ring buffer
2025-12-07 06:08:07 +09:00
cgroup
cgroup: split cgroup_destroy_wq into 3 workqueues
2025-10-02 13:35:40 +02:00
configs
…
debug
kdb: Do not assume write() callback available
2025-03-13 12:47:22 +01:00
dma
dma/pool: eliminate alloc_pages warning in atomic_pool_expand
2026-01-19 13:11:38 +01:00
entry
entry/kvm: Exit to user mode when TIF_NOTIFY_SIGNAL is set
2023-01-04 11:39:22 +01:00
events
uprobe: Do not emulate/sstep original instruction when ip is changed
2025-12-07 06:08:10 +09:00
futex
futex: Don't include process MM in futex key on no-MMU
2023-11-20 11:06:44 +01:00
gcov
gcov: add support for GCC 15
2025-12-07 06:08:19 +09:00
irq
genirq: Provide new interfaces for affinity hints
2025-10-02 13:35:39 +02:00
kcsan
kcsan: Turn report_filterlist_lock into a raw_spinlock
2024-12-14 19:48:25 +01:00
livepatch
livepatch: Match old_sympos 0 and 1 in klp_find_func()
2026-01-19 13:11:41 +01:00
locking
locking/spinlock/debug: Fix data-race in do_raw_write_lock
2026-01-19 13:11:25 +01:00
power
PM: sleep: console: Fix the black screen issue
2025-08-28 16:22:41 +02:00
printk
printk: Fix signed integer overflow when defining LOG_BUF_LEN_MAX
2025-03-13 12:47:01 +01:00
rcu
rcu: Protect ->defer_qs_iw_pending from data race
2025-08-28 16:22:42 +02:00
sched
sched/fair: Fix pelt lost idle time detection
2025-10-29 14:01:20 +01:00
time
clocksource: Fix the CPUs' choice in the watchdog per CPU verification
2025-06-27 11:04:15 +01:00
trace
tracing: Do not register unsupported perf events
2026-01-19 13:11:51 +01:00
.gitignore
kbuild: update config_data.gz only when the content of .config is changed
2021-05-11 14:47:37 +02:00
acct.c
acct: perform last write from workqueue
2025-03-13 12:47:35 +01:00
async.c
async: Introduce async_schedule_dev_nocall()
2024-02-23 08:41:53 +01:00
audit_fsnotify.c
fsnotify: make allow_dups a property of the group
2024-06-21 14:53:39 +02:00
audit_tree.c
fsnotify: pass flags argument to fsnotify_alloc_group()
2024-06-21 14:53:39 +02:00
audit_watch.c
fsnotify: pass flags argument to fsnotify_alloc_group()
2024-06-21 14:53:39 +02:00
audit.c
audit: Send netlink ACK before setting connection in auditd_set
2024-02-23 08:42:03 +01:00
audit.h
audit: log AUDIT_TIME_* records only from rules
2022-04-08 14:40:00 +02:00
auditfilter.c
ima: Avoid blocking in RCU read-side critical section
2024-07-18 13:05:44 +02:00
auditsc.c
audit: fix possible soft lockup in __audit_inode_child()
2023-09-19 12:20:13 +02:00
backtracetest.c
treewide: Replace DECLARE_TASKLET() with DECLARE_TASKLET_OLD()
2020-07-30 11:15:58 -07:00
bounds.c
bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS
2024-05-02 16:23:46 +02:00
capability.c
LSM: Signal to SafeSetID when setting group IDs
2020-10-13 09:17:34 -07:00
compat.c
sched_getaffinity: don't assume 'cpumask_size()' is fully initialized
2023-04-05 11:23:45 +02:00
configs.c
…
context_tracking.c
…
cpu_pm.c
PM: cpu: Make notifier chain use a raw_spinlock_t
2021-09-15 09:50:40 +02:00
cpu.c
hrtimers: Handle CPU state correctly on hotplug
2025-02-01 18:22:29 +01:00
crash_core.c
crash_core, vmcoreinfo: append 'SECTION_SIZE_BITS' to vmcoreinfo
2021-06-23 14:42:52 +02:00
crash_dump.c
…
cred.c
cred: switch to using atomic_long_t
2023-12-20 15:44:30 +01:00
delayacct.c
…
dma.c
…
exec_domain.c
…
exit.c
perf: Fix sample vs do_exit()
2025-06-27 11:04:24 +01:00
extable.c
…
fail_function.c
kernel/fail_function: fix memory leak with using debugfs_lookup()
2023-03-11 16:40:18 +01:00
fork.c
copy_sighand: Handle architectures where sizeof(unsigned long) < sizeof(u64)
2025-10-29 14:01:11 +01:00
freezer.c
Revert "kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing"
2021-04-07 15:00:14 +02:00
gen_kheaders.sh
kheaders: Ignore silly-rename files
2025-02-01 18:22:28 +01:00
groups.c
LSM: Signal to SafeSetID when setting group IDs
2020-10-13 09:17:34 -07:00
hung_task.c
kernel/hung_task.c: make type annotations consistent
2020-11-02 12:14:19 -08:00
iomem.c
…
irq_work.c
…
jump_label.c
jump_label: Fix jump_label_text_reserved() vs __init
2021-07-20 16:05:58 +02:00
kallsyms.c
kallsyms: Make kallsyms_on_each_symbol generally available
2024-10-17 15:08:29 +02:00
kcmp.c
kcmp: In get_file_raw_ptr use task_lookup_fd_rcu
2024-06-21 14:52:48 +02:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: don't lose track of remote references during softirqs
2024-07-05 09:12:41 +02:00
kexec_core.c
kexec: fix a memory leak in crash_shrink_memory()
2023-07-27 08:43:40 +02:00
kexec_elf.c
kexec: initialize ELF lowest address to ULONG_MAX
2025-04-10 14:30:58 +02:00
kexec_file.c
kexec: support purgatories with .text.hot sections
2023-06-21 15:45:37 +02:00
kexec_internal.h
panic, kexec: make __crash_kexec() NMI safe
2023-04-20 12:10:29 +02:00
kexec.c
panic, kexec: make __crash_kexec() NMI safe
2023-04-20 12:10:29 +02:00
kheaders.c
kheaders: Use array declaration instead of char
2023-05-17 11:47:33 +02:00
kmod.c
kmod: remove redundant "be an" in the comment
2020-08-12 10:58:01 -07:00
kprobes.c
x86/ibt,ftrace: Search for __fentry__ location
2024-10-17 15:07:37 +02:00
ksysfs.c
kexec: turn all kexec_mutex acquisitions into trylocks
2023-04-20 12:10:29 +02:00
kthread.c
kthread: fix task state in kthread worker if being frozen
2024-10-17 15:07:50 +02:00
latencytop.c
…
Makefile
futex: Move to kernel/futex/
2023-01-14 10:15:20 +01:00
module_signature.c
module: harden ELF info handling
2021-03-25 09:04:11 +01:00
module_signing.c
module: harden ELF info handling
2021-03-25 09:04:11 +01:00
module-internal.h
…
module.c
kallsyms: Make module_kallsyms_on_each_symbol generally available
2024-10-17 15:08:29 +02:00
notifier.c
notifier: Fix broken error handling pattern
2020-09-01 09:58:03 +02:00
nsproxy.c
…
padata.c
padata: Reset next CPU when reorder sequence wraps around
2025-10-29 14:01:23 +01:00
panic.c
panic: Flush kernel log buffer at the end
2024-04-13 12:59:40 +02:00
params.c
module: ensure that kobject_put() is safe for module type kobjects
2025-06-04 14:36:55 +02:00
pid_namespace.c
zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING
2024-07-05 09:12:33 +02:00
pid.c
pid: Add a judgment for ns null in pid_nr_ns
2025-10-29 14:01:14 +01:00
profile.c
kernel: Initialize cpumask before parsing
2025-01-09 13:25:04 +01:00
ptrace.c
ptrace: Reimplement PTRACE_KILL by always sending SIGKILL
2022-06-09 10:20:49 +02:00
range.c
kernel.h: split out min()/max() et al. helpers
2020-10-16 11:11:19 -07:00
reboot.c
kernel/reboot: emergency_restart: Set correct system_state
2023-11-28 16:54:58 +00:00
regset.c
regset: kill ->get()
2020-07-27 14:31:12 -04:00
relay.c
relayfs: fix out-of-bounds access in relay_file_read
2023-05-17 11:47:34 +02:00
resource.c
kernel/resource: fix kfree() of bootmem memory again
2025-05-02 07:41:09 +02:00
rseq.c
rseq: Fix segfault on registration when rseq_cs is non-zero
2025-07-17 18:28:01 +02:00
scftorture.c
scftorture: Forgive memory-allocation failure if KASAN
2023-09-23 11:01:05 +02:00
scs.c
scs: fix a wrong parameter in __scs_magic
2026-01-19 13:11:50 +01:00
seccomp.c
seccomp: Invalidate seccomp mode to catch death failures
2024-03-01 13:16:46 +01:00
signal.c
signal: Replace BUG_ON()s
2024-10-17 15:08:12 +02:00
smp.c
smp: Add missing destroy_work_on_stack() call in smp_call_on_cpu()
2024-09-12 11:06:48 +02:00
smpboot.c
sched/core: Initialize the idle task with preemption disabled
2021-07-14 16:55:50 +02:00
smpboot.h
…
softirq.c
softirq: Add debug check to __raise_softirq_irqoff()
2020-09-16 15:18:56 +02:00
stackleak.c
gcc-plugins/stackleak: Use noinstr in favor of notrace
2022-02-23 12:01:00 +01:00
stacktrace.c
stacktrace: Remove reliable argument from arch_stack_walk() callback
2020-09-18 14:24:16 +01:00
static_call.c
x86/static-call: provide a way to do very early static-call updates
2024-12-19 18:06:13 +01:00
stop_machine.c
stop_machine, rcu: Mark functions as notrace
2020-10-26 12:12:27 +01:00
sys_ni.c
syscalls: fix compat_sys_io_pgetevents_time64 usage
2024-07-05 09:12:55 +02:00
sys.c
fs: add file and path permissions helpers
2024-06-21 14:52:58 +02:00
sysctl-test.c
…
sysctl.c
sysctl: introduce new proc handler proc_dobool
2024-06-21 14:53:18 +02:00
task_work.c
task_work: Introduce task_work_cancel() again
2024-08-19 05:40:57 +02:00
taskstats.c
taskstats: move specifying netlink policy back to ops
2020-10-02 19:11:12 -07:00
test_kprobes.c
…
torture.c
torture: Fix hang during kthread shutdown phase
2023-08-30 16:23:17 +02:00
tracepoint.c
tracepoint: Use rcu get state and cond sync for static call updates
2021-09-03 10:09:30 +02:00
tsacct.c
taskstats: Cleanup the use of task->exit_code
2022-01-27 10:54:33 +01:00
ucount.c
fanotify: configurable limits via sysfs
2024-06-21 14:53:06 +02:00
uid16.c
…
uid16.h
…
umh.c
usermodehelper: reset umask to default before executing user process
2020-10-06 10:31:52 -07:00
up.c
smp: Fix smp_call_function_single_async prototype
2021-05-14 09:50:46 +02:00
user_namespace.c
Revert "Add a reference to ucounts for each cred"
2021-09-08 08:49:00 +02:00
user-return-notifier.c
…
user.c
…
usermode_driver.c
bpf: Fix umd memory leak in copy_process()
2021-03-30 14:32:03 +02:00
utsname_sysctl.c
…
utsname.c
…
watch_queue.c
watch_queue: fix pipe accounting mismatch
2025-04-10 14:30:55 +02:00
watchdog_hld.c
watchdog/perf: properly initialize the turbo mode timestamp and rearm counter
2024-08-19 05:41:01 +02:00
watchdog.c
watchdog: move softlockup_panic back to early_param
2023-11-28 16:54:56 +00:00
workqueue_internal.h
…
workqueue.c
Revert "workqueue: remove unused cancel_work()"
2023-12-08 08:46:13 +01:00