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SubjectWARN_ON_ONCE() hit at kernel/events/core.c:330
Date
I use linux 5.1.0-rc3 on s390 and got this WARN_ON_ONCE message:

WARNING: CPU: 15 PID: 0 at kernel/events/core.c:330
event_function_local.constprop.79+0xe2/0xe8

which was introduced with
commit cca2094605ef ("perf/core: Fix event_function_local()").

This is the WARN_ON_ONCE message, which sometimes shows up in the kernel
log:
[ 4598.316519] WARNING: CPU: 15 PID: 0 at kernel/events/core.c:330
event_function_local.constprop.79+0xe2/0xe8
[ 4598.316524] Kernel panic - not syncing: panic_on_warn set ...
[ 4598.316527] CPU: 15 PID: 0 Comm: swapper/15 Tainted: G OE
5.1.0-20190402.rc3.git0.5e7a8ca31926.300.fc29.s390x+git #1
[ 4598.316529] Hardware name: IBM 2964 NC9 712 (LPAR)
[ 4598.316531] Call Trace:
[ 4598.316534] ([<0000000000112eb8>] show_stack+0x58/0x70)
[ 4598.316538] [<0000000000a820aa>] dump_stack+0x7a/0xa8
[ 4598.316541] [<0000000000143b52>] panic+0x11a/0x2d0
[ 4598.316543] [<00000000001439b0>] __warn+0xf8/0x118
[ 4598.316545] [<0000000000a811a8>] report_bug+0xd8/0x150
[ 4598.316547] [<00000000001014ac>] do_report_trap+0xc4/0xe0
[ 4598.316549] [<0000000000101680>] illegal_op+0x138/0x150
[ 4598.316552] [<0000000000aa233c>] pgm_check_handler+0x1cc/0x220
[ 4598.316554] [<00000000002a6d02>] event_function_local.constprop.79+
0xe2/0xe8
[ 4598.316556] ([<00000000002a6c7a>] event_function_local.constprop.79+
0x5a/0xe8)
[ 4598.316559] [<00000000002aa400>] perf_pending_event+0x88/0xb0
[ 4598.316561] [<0000000000271a8c>] irq_work_run_list+0x8c/0xb8
[ 4598.316563] [<0000000000271d78>] irq_work_tick+0x48/0x68
[ 4598.316566] [<00000000001d6058>] update_process_times+0x68/0x80
[ 4598.316568] [<00000000001e6c10>] tick_sched_handle.isra.6+0x50/0x60
[ 4598.316570] [<00000000001e6c7e>] tick_sched_timer+0x5e/0xb8
[ 4598.316573] [<00000000001d6b6a>] __hrtimer_run_queues+0x10a/0x2c0
[ 4598.316575] [<00000000001d7a88>] hrtimer_interrupt+0x138/0x2a8
[ 4598.316577] [<000000000010c3e4>] do_IRQ+0xac/0xb0
[ 4598.316597] [<0000000000aa2744>] ext_int_handler+0x128/0x12c
[ 4598.316600] [<00000000001034f6>] enabled_wait+0x46/0xd0
[ 4598.316602] ([<000003e000d2fe10>] 0x3e000d2fe10)
[ 4598.316604] [<0000000000103842>] arch_cpu_idle+0x3a/0x50
[ 4598.316606] [<000000000017b808>] do_idle+0x180/0x1b0
[ 4598.316608] [<000000000017ba06>] cpu_startup_entry+0x36/0x40
[ 4598.316611] [<0000000000115d16>] smp_init_secondary+0xd6/0xf0
[ 4598.316613] [<000000000011521e>] smp_start_secondary+0x86/0x98

Any ideas or hints who to avoid/fix this warning?

I ran a user space program which uses

1. perf_event_open() system call with type HARDWARE
and PERF_COUNT_HW_CPU_CYCLES in sampling mode.
2. Assigns signal SIGIO to the file descriptor returned from
perf_event_open() using:
rc = fcntl(fd, F_SETFL, O_RDWR | O_NONBLOCK | O_ASYNC);
rc |= fcntl(fd, F_SETSIG, signo);
rc |= fcntl(fd, F_SETOWN, getpid());

3. The signal handler increments some variables and issues
ioctl(fd, PERF_EVENT_IOC_REFRESH, 1);
to restart signal delivery.

I can send you the test program if needed.

Thanks a lot for your help.


--
Thomas Richter, Dept 3252, IBM s390 Linux Development, Boeblingen, Germany
--
Vorsitzender des Aufsichtsrats: Matthias Hartmann
Geschäftsführung: Dirk Wittkopp
Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294

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