IIUC fdarray__filter() should check filterable events only and leave
non-filterable events to be handled outside.  The recent change to set
fd to -1 made perf record test stuck forever.  Adding the check the flag
fixes the problem for me.

Before:
  $ timeout 100 sudo perf test 105
  105: perf record tests                                     : Running (1 active)

  Signal (15) while running tests.
  Terminating tests with the same signal
  Internal test harness failure. Completing any started tests:
  105: perf record tests                                     : FAILED!

  === Test Summary ===
  Passed main tests : 0
  Passed subtests   : 0
  Skipped tests     : 0
  Failed tests      : 1
  List of failed tests:
    105: perf record tests

After:
  $ time sudo perf test 105
  105: perf record tests                                     : Ok

  === Test Summary ===
  Passed main tests : 1
  Passed subtests   : 0
  Skipped tests     : 0
  Failed tests      : 0

  real	0m52.472s
  user	0m0.830s
  sys	0m0.535s

Fixes:f94563fac269 ("perf record: fix poll storm when monitored threads exit")
Cc: Jiawei Sun <abyssmystery@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/lib/api/fd/array.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/lib/api/fd/array.c b/tools/lib/api/fd/array.c
index ffe8272af59b2da0..b4570e4981492cd7 100644
--- a/tools/lib/api/fd/array.c
+++ b/tools/lib/api/fd/array.c
@@ -117,6 +117,8 @@ int fdarray__filter(struct fdarray *fda, short revents,
 	for (fd = 0; fd < fda->nr; ++fd) {
 		if (!fda->entries[fd].events)
 			continue;
+		if (fda->priv[fd].flags & fdarray_flag__nonfilterable)
+			continue;
 
 		if (fda->entries[fd].revents & revents) {
 			if (entry_destructor)
@@ -132,8 +134,7 @@ int fdarray__filter(struct fdarray *fda, short revents,
 			continue;
 		}
 
-		if (!(fda->priv[fd].flags & fdarray_flag__nonfilterable))
-			++nr;
+		++nr;
 	}
 
 	return nr;
-- 
2.55.0.795.g602f6c329a-goog