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Steven Rostedt 65b1971147 tracing: Do not register unsupported perf events 
commit ef7f38df890f5dcd2ae62f8dbde191d72f3bebae 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>
2026-01-11 15:22:01 +01:00
..
bpf
bpf: Fix invalid prog->stats access when update_effective_progs fails
2026-01-11 15:21:25 +01:00
cgroup
cpuset: Treat cpusets in attaching as populated
2026-01-11 15:21:27 +01:00
configs
Merge tag 'kbuild-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
2023-09-05 11:01:47 -07:00
debug
kdb: Use the passed prompt in kdb_position_cursor()
2024-08-03 08:54:34 +02:00
dma
dma/pool: eliminate alloc_pages warning in atomic_pool_expand
2026-01-11 15:21:38 +01:00
entry
entry: Respect changes to system call number by trace_sys_enter()
2024-04-03 15:28:50 +02:00
events
uprobe: Do not emulate/sstep original instruction when ip is changed
2025-11-24 10:29:23 +01:00
futex
futex: Don't leak robust_list pointer on exec race
2025-11-24 10:29:22 +01:00
gcov
gcov: add support for GCC 15
2025-11-24 10:30:06 +01:00
irq
genirq: Make handle_enforce_irqctx() unconditionally available
2025-02-08 09:51:48 +01:00
kcsan
kcsan: test: Initialize dummy variable
2025-08-15 12:08:49 +02:00
livepatch
livepatch: Match old_sympos 0 and 1 in klp_find_func()
2026-01-11 15:21:43 +01:00
locking
locking/spinlock/debug: Fix data-race in do_raw_write_lock
2026-01-11 15:21:07 +01:00
module
module: Prevent silent truncation of module name in delete_module(2)
2025-08-28 16:28:28 +02:00
power
PM: sleep: console: Fix the black screen issue
2025-08-28 16:28:17 +02:00
printk
printk: Check CON_SUSPEND when unblanking a console
2025-06-04 14:42:00 +02:00
rcu
rcu-tasks: Maintain real-time response in rcu_tasks_postscan()
2025-09-19 16:32:03 +02:00
sched
sched/fair: Revert max_newidle_lb_cost bump
2026-01-11 15:21:42 +01:00
time
timers: Fix NULL function pointer race in timer_shutdown_sync()
2025-12-01 11:41:38 +01:00
trace
tracing: Do not register unsupported perf events
2026-01-11 15:22:01 +01:00
.gitignore
…
acct.c
acct: block access to kernel internal filesystems
2025-02-27 04:10:52 -08:00
async.c
async: Introduce async_schedule_dev_nocall()
2024-01-31 16:18:49 -08:00
audit_fsnotify.c
audit: fix potential double free on error path from fsnotify_add_inode_mark
2022-08-22 18:50:06 -04:00
audit_tree.c
audit: use fsnotify group lock helpers
2022-04-25 14:37:28 +02:00
audit_watch.c
audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()
2023-11-28 17:19:56 +00:00
audit.c
audit: Send netlink ACK before setting connection in auditd_set
2024-02-05 20:14:14 +00:00
audit.h
audit,module: restore audit logging in load failure case
2025-08-15 12:08:39 +02:00
auditfilter.c
ima: Avoid blocking in RCU read-side critical section
2024-07-11 12:49:18 +02:00
auditsc.c
audit,module: restore audit logging in load failure case
2025-08-15 12:08:39 +02:00
backtracetest.c
…
bounds.c
bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS
2024-05-02 16:32:50 +02:00
capability.c
lsm: constify the 'target' parameter in security_capget()
2023-08-08 16:48:47 -04:00
cfi.c
cfi: Switch to -fsanitize=kcfi
2022-09-26 10:13:13 -07:00
compat.c
sched_getaffinity: don't assume 'cpumask_size()' is fully initialized
2023-03-14 19:32:38 -07:00
configs.c
…
context_tracking.c
locking/atomic: treewide: use raw_atomic*_<op>()
2023-06-05 09:57:20 +02:00
cpu_pm.c
cpuidle, cpu_pm: Remove RCU fiddling from cpu_pm_{enter,exit}()
2023-01-13 11:48:15 +01:00
cpu.c
hrtimers: Handle CPU state correctly on hotplug
2025-01-23 17:21:17 +01:00
crash_core.c
mm: turn folio_test_hugetlb into a PageType
2024-05-02 16:32:47 +02:00
crash_dump.c
…
cred.c
cred: get rid of CONFIG_DEBUG_CREDENTIALS
2023-12-20 17:01:51 +01:00
delayacct.c
delayacct: track delays from IRQ/SOFTIRQ
2023-04-18 16:39:34 -07:00
dma.c
…
exec_domain.c
…
exit.c
perf: Fix sample vs do_exit()
2025-06-27 11:09:03 +01:00
extable.c
context_tracking: Take NMI eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
fail_function.c
kernel/fail_function: fix memory leak with using debugfs_lookup()
2023-02-08 13:36:22 +01:00
fork.c
copy_sighand: Handle architectures where sizeof(unsigned long) < sizeof(u64)
2025-10-19 16:30:48 +02:00
freezer.c
sched,freezer: Remove unnecessary warning in __thaw_task
2025-08-15 12:09:07 +02:00
gen_kheaders.sh
kheaders: Ignore silly-rename files
2025-01-23 17:21:13 +01:00
groups.c
security: Add LSM hook to setgroups() syscall
2022-07-15 18:21:49 +00:00
hung_task.c
kernel/hung_task.c: set some hung_task.c variables storage-class-specifier to static
2023-04-08 13:45:37 -07:00
iomem.c
kernel/iomem.c: remove __weak ioremap_cache helper
2023-08-21 13:37:28 -07:00
irq_work.c
trace: Add trace_ipi_send_cpu()
2023-03-24 11:01:29 +01:00
jump_label.c
jump_label: Fix static_key_slow_dec() yet again
2024-10-10 11:57:13 +02:00
kallsyms_internal.h
kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]
2022-11-12 18:47:36 -08:00
kallsyms_selftest.c
Merge tag 'modules-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux
2023-08-29 17:32:32 -07:00
kallsyms_selftest.h
kallsyms: Add self-test facility
2022-11-15 00:42:02 -08:00
kallsyms.c
kallsyms: Fix wrong "big" kernel symbol type read from procfs
2026-01-11 15:21:55 +01:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.kexec
kexec: select CRYPTO from KEXEC_FILE instead of depending on it
2024-01-05 15:19:41 +01:00
Kconfig.locks
…
Kconfig.preempt
Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"
2022-03-31 10:36:55 +02:00
kcov.c
kcov: mark in_softirq_really() as __always_inline
2025-01-09 13:32:07 +01:00
kexec_core.c
crash: fix crashkernel resource shrink
2025-12-01 11:41:52 +01:00
kexec_elf.c
kexec: initialize ELF lowest address to ULONG_MAX
2025-04-10 14:37:34 +02:00
kexec_file.c
kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH_HOTPLUG=y
2024-09-12 11:11:27 +02:00
kexec_internal.h
panic, kexec: make __crash_kexec() NMI safe
2022-09-11 21:55:06 -07:00
kexec.c
kernel: kexec: copy user-array safely
2023-11-28 17:19:40 +00:00
kheaders.c
kheaders: Use array declaration instead of char
2023-03-24 20:10:59 -07:00
kprobes.c
kprobes: Fix to check symbol prefixes correctly
2024-08-14 13:58:51 +02:00
ksyms_common.c
kallsyms: make kallsyms_show_value() as generic function
2023-06-08 12:27:20 -07:00
ksysfs.c
crash: hotplug support for kexec_load()
2023-08-24 16:25:14 -07:00
kthread.c
kthread: unpark only parked kthread
2024-10-17 15:24:37 +02:00
latencytop.c
latencytop: use the last element of latency_record of system
2022-09-11 21:55:12 -07:00
Makefile
kernel/numa.c: Move logging out of numa.h
2024-06-12 11:11:50 +02:00
module_signature.c
…
notifier.c
notifiers: add tracepoints to the notifiers infrastructure
2023-04-08 13:45:38 -07:00
nsproxy.c
nsproxy: Convert nsproxy.count to refcount_t
2023-08-21 11:29:12 -07:00
numa.c
kernel/numa.c: Move logging out of numa.h
2024-06-12 11:11:50 +02:00
padata.c
padata: Reset next CPU when reorder sequence wraps around
2025-10-23 16:16:41 +02:00
panic.c
objtool, panic: Disable SMAP in __stack_chk_fail()
2025-05-02 07:50:55 +02:00
params.c
module: ensure that kobject_put() is safe for module type kobjects
2025-05-18 08:24:08 +02:00
pid_namespace.c
zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING
2024-06-21 14:38:50 +02:00
pid_sysctl.h
memfd: replace ratcheting feature from vm.memfd_noexec with hierarchy
2023-08-21 13:37:59 -07:00
pid.c
pid: Add a judgment for ns null in pid_nr_ns
2025-10-19 16:31:01 +02:00
profile.c
profiling: remove profile=sleep support
2024-08-14 13:58:47 +02:00
ptrace.c
ptrace: Provide set/get interface for syscall user dispatch
2023-04-16 14:23:07 +02:00
range.c
…
reboot.c
kernel/reboot: emergency_restart: Set correct system_state
2023-11-28 17:20:04 +00:00
regset.c
…
relay.c
kernel: relay: remove unnecessary NULL values from relay_open_buf
2023-08-18 10:18:55 -07:00
resource_kunit.c
…
resource.c
Reinstate "resource: avoid unnecessary lookups in find_next_iomem_res()"
2026-01-11 15:21:34 +01:00
rseq.c
rseq: Protect event mask against membarrier IPI
2025-10-19 16:30:59 +02:00
scftorture.c
scftorture: Pause testing after memory-allocation failure
2023-07-14 15:02:57 -07:00
scs.c
scs: fix a wrong parameter in __scs_magic
2026-01-11 15:22:00 +01:00
seccomp.c
seccomp: Fix a race with WAIT_KILLABLE_RECV if the tracer replies too fast
2025-10-15 11:57:48 +02:00
signal.c
posix-timers: Target group sigqueue to current task only if not exiting
2024-12-09 10:33:11 +01:00
smp.c
smp: Fix up and expand the smp_call_function_many() kerneldoc
2025-10-15 11:57:53 +02:00
smpboot.c
kthread: add kthread_stop_put
2024-06-12 11:12:52 +02:00
smpboot.h
…
softirq.c
lockdep: Fix wait context check on softirq for PREEMPT_RT
2025-06-04 14:41:55 +02:00
stackleak.c
stackleak: allow to specify arch specific stackleak poison function
2023-04-20 11:36:35 +02:00
stacktrace.c
uaccess: remove CONFIG_SET_FS
2022-02-25 09:36:06 +01:00
static_call_inline.c
x86/static-call: provide a way to do very early static-call updates
2024-12-19 18:11:36 +01:00
static_call.c
static_call: Don't make __static_call_return0 static
2022-04-05 09:59:38 +02:00
stop_machine.c
Merge tag 'sched-core-2022-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-05-24 11:11:13 -07:00
sys_ni.c
syscalls: fix compat_sys_io_pgetevents_time64 usage
2024-07-05 09:34:04 +02:00
sys.c
kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths
2025-10-19 16:30:50 +02:00
sysctl-test.c
kernel/sysctl-test: use SYSCTL_{ZERO/ONE_HUNDRED} instead of i_{zero/one_hundred}
2022-09-08 16:56:45 -07:00
sysctl.c
Merge tag 'v6.5-rc1-sysctl-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux
2023-06-28 16:05:21 -07:00
task_work.c
task_work: Fix NMI race condition
2026-01-11 15:21:17 +01:00
taskstats.c
genetlink: start to validate reserved header bytes
2022-08-29 12:47:15 +01:00
torture.c
rcutorture: Fix stuttering races and other issues
2023-11-28 17:20:08 +00:00
tracepoint.c
tracepoint: Allow livepatch module add trace event
2023-02-18 14:34:36 -05:00
tsacct.c
taskstats: version 12 with thread group and exe info
2022-04-29 14:38:03 -07:00
ucount.c
ucount: fix atomic_long_inc_below() argument type
2025-08-15 12:08:57 +02:00
uid16.c
…
uid16.h
…
umh.c
sysctl: fix unused proc_cap_handler() function warning
2023-06-29 15:19:43 -07:00
up.c
…
user_namespace.c
userns: fix a struct's kernel-doc notation
2023-02-02 22:50:04 -08:00
user-return-notifier.c
…
user.c
kernel/user: Allow user_struct::locked_vm to be usable for iommufd
2022-11-30 20:16:49 -04:00
usermode_driver.c
blob_to_mnt(): kern_unmount() is needed to undo kern_mount()
2022-05-19 23:25:47 -04:00
utsname_sysctl.c
utsname: simplify one-level sysctl registration for uts_kern_table
2023-04-13 11:49:35 -07:00
utsname.c
…
vhost_task.c
vhost: Take a reference on the task in struct vhost_task.
2025-10-02 13:42:51 +02:00
watch_queue.c
watch_queue: fix pipe accounting mismatch
2025-04-10 14:37:25 +02:00
watchdog_buddy.c
watchdog/hardlockup: move SMP barriers from common code to buddy code
2023-06-19 16:25:28 -07:00
watchdog_perf.c
watchdog/perf: properly initialize the turbo mode timestamp and rearm counter
2024-08-03 08:54:29 +02:00
watchdog.c
watchdog: fix watchdog may detect false positive of softlockup
2025-06-27 11:08:49 +01:00
workqueue_internal.h
workqueue: Drop the special locking rule for worker->flags and worker_pool->flags
2023-08-07 15:57:22 -10:00
workqueue.c
workqueue: Do not warn when cancelling WQ_MEM_RECLAIM work from !WQ_MEM_RECLAIM worker
2025-01-17 13:36:25 +01:00