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SubjectBeagle x15: perf test -v hangs on Linux 4.9 and 4.14
Perf test -v hangs on beagle x15 device running Linux version stable
4.9 and 4.14 kernel. ( gcc version 7.3.0).

X15
----
Test breakpoint overflow signal handler: FAILED
Test breakpoint overflow sampling :
--- start ---
test child forked, pid 381
***Hangs Forever***

Debug log with strace output,

strace -f perf test -v
...
[pid 346] perf_event_open({type=PERF_TYPE_BREAKPOINT,
size=PERF_ATTR_SIZE_VER5, config=0, ...}, 0, -1, -1,
PERF_FLAG_FD_CLOEXEC) = 3
[pid 346] fcntl64(3, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) = 0
[pid 346] fcntl64(3, F_SETSIG, SIGIO) = 0
[pid 346] getpid() = 346
[pid 346] fcntl64(3, F_SETOWN, 346) = 0
[pid 346] ioctl(3, PERF_EVENT_IOC_RESET, 0) = 0
[pid 346] ioctl(3, PERF_EVENT_IOC_ENABLE, 0) = 0
[pid 346] --- SIGIO {si_signo=SIGIO, si_code=POLL_IN, si_band=65} ---
[pid 346] rt_sigreturn({mask=[WINCH]}) = 0
...
popping up this log continuesly
....
[pid 346] --- SIGIO {si_signo=SIGIO, si_code=POLL_IN, si_band=65} ---
[pid 346] rt_sigreturn({mask=[WINCH]}) = 0"}

Ref:
Juno/x15: perf: Test breakpoint overflow sampling and test hangs
https://bugs.linaro.org/show_bug.cgi?id=4321
Full test log,
https://lkft.validation.linaro.org/scheduler/job/655038#L1794
Kernel Config,
http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/am57xx-evm/lkft/linux-stable-rc-4.9/524/config

Best regards
Naresh Kamboju

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