FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/core
commit e4318ece59841fa31e1b265e6e14463ff412077c ("perf: Collapse and fix event_function_call() users")


+---------------------------------------------------+------------+------------+
|                                                   | c6dadf5706 | e4318ece59 |
+---------------------------------------------------+------------+------------+
| boot_successes                                    | 8          | 19         |
| boot_failures                                     | 0          | 4          |
| WARNING:at_kernel/events/core.c:#event_function() | 0          | 4          |
| backtrace:do_group_exit                           | 0          | 4          |
| backtrace:SyS_exit_group                          | 0          | 4          |
+---------------------------------------------------+------------+------------+



[   12.573084] Key type id_resolver registered
[   12.573335] Key type id_legacy registered
[   13.835874] ------------[ cut here ]------------
[   13.835880] WARNING: CPU: 3 PID: 551 at kernel/events/core.c:213 event_function+0x1cd/0x1e0()
[   13.835896] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver netconsole sr_mod cdrom sg sd_mod dcdbas coretemp ata_generic pata_acpi snd_hda_codec_realtek kvm_intel dell_smm_hwmon snd_hda_codec_generic i7core_edac kvm snd_hda_codec_hdmi irqbypass crc32c_intel pcspkr ata_piix serio_raw edac_core usb_storage libata snd_hda_intel firewire_ohci snd_hda_codec snd_hda_core firewire_core crc_itu_t snd_hwdep snd_pcm snd_timer snd soundcore shpchp acpi_cpufreq broadcom bcm_phy_lib
[   13.835898] CPU: 3 PID: 551 Comm: breakpoint_test Not tainted 4.4.0-rc5-00311-ge4318ece #1
[   13.835899] Hardware name: Dell Inc. Studio XPS 8000/0X231R, BIOS A01 08/11/2009
[   13.835901]  ffffffff81bb4968 ffff88009de27c90 ffffffff81410ec2 0000000000000000
[   13.835902]  ffff88009de27cc8 ffffffff81078e06 ffff88013fcdab00 ffff88009d552000
[   13.835903]  ffff88009f451600 0000000000000000 ffff88009de27df0 ffff88009de27cd8
[   13.835903] Call Trace:
[   13.835907]  [<ffffffff81410ec2>] dump_stack+0x4b/0x69
[   13.835911]  [<ffffffff81078e06>] warn_slowpath_common+0x86/0xc0
[   13.835912]  [<ffffffff81078efa>] warn_slowpath_null+0x1a/0x20
[   13.835913]  [<ffffffff8115861d>] event_function+0x1cd/0x1e0
[   13.835915]  [<ffffffff8115d950>] ? __perf_event_disable+0xe0/0xe0
[   13.835917]  [<ffffffff81159e4a>] remote_function+0x3a/0x40
[   13.835920]  [<ffffffff810f8da6>] generic_exec_single+0xb6/0x120
[   13.835922]  [<ffffffff81159e10>] ? schedule_orphans_remove+0x50/0x50
[   13.835923]  [<ffffffff810f8ece>] smp_call_function_single+0xbe/0x110
[   13.835926]  [<ffffffff811ca844>] ? __slab_free+0xb4/0x230
[   13.835927]  [<ffffffff81158834>] task_function_call+0x44/0x50
[   13.835928]  [<ffffffff81158450>] ? cpu_clock_event_read+0x30/0x30
[   13.835931]  [<ffffffff8115c2f7>] event_function_call+0x87/0xf0
[   13.835932]  [<ffffffff8115d950>] ? __perf_event_disable+0xe0/0xe0
[   13.835933]  [<ffffffff81160248>] put_event+0xb8/0x110
[   13.835936]  [<ffffffff811602a9>] perf_event_release_kernel+0x9/0x10
[   13.835938]  [<ffffffff81165ad3>] unregister_hw_breakpoint+0x13/0x20
[   13.835941]  [<ffffffff8101f27b>] flush_ptrace_hw_breakpoint+0x2b/0x60
[   13.835943]  [<ffffffff8107bd65>] do_exit+0x3c5/0xb30
[   13.835945]  [<ffffffff81063d6a>] ? __do_page_fault+0x1ca/0x410
[   13.835946]  [<ffffffff8107c553>] do_group_exit+0x43/0xc0
[   13.835947]  [<ffffffff8107c5e4>] SyS_exit_group+0x14/0x20
[   13.835950]  [<ffffffff818c716e>] entry_SYSCALL_64_fastpath+0x12/0x71
[   13.835952] ---[ end trace 971a0c51e963985d ]---
[   13.835952] ---[ end trace 971a0c51e963985d ]---


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Ying Huang