Hi all, while makeing some tests I recognized, that sometime select() and close() crashes, if the number of used file descriptors is > 60.
With a value >93 select() crashes.
With a value between 61 and 81 a close() call crashes instead of select(), but it
seems that this is caused by the
previous select() call.
Appended is a little test app for error reproducing.
$ ./test 60
dup
select
close
close2
$ ./test 61
dup
select
close
Segmentation fault (core dumped)
$ ./test 62
dup
select
close
Segmentation fault (core dumped)
...
$ ./test 81
dup
select
close
Segmentation fault (core dumped)
$ ./test 82
dup
select
close
close2
.....
$ ./test 92
dup
select
close
close2
$ ./test 93
dup
select
Segmentation fault (core dumped)
The select() crashes in the cygwin1.dll in the method "select_stuff::~select_stuff"
like shown in the strace
snippet below
4604 7210385 [main] lat_select 2308 set_bits: ready 1
4401 7214786 [main] lat_select 2308 set_bits: me 0xA011808, testing fd 7 (/tmp/t904.0)
4738 7219524 [main] lat_select 2308 set_bits: ready 1
4472 7223996 [main] lat_select 2308 set_bits: me 0xA0117D8, testing fd 6 (/tmp/t904.0)
4487 7228483 [main] lat_select 2308 set_bits: ready 1
4573 7233056 [main] lat_select 2308 set_bits: me 0xA0117A8, testing fd 5 (/tmp/t904.0)
4601 7237657 [main] lat_select 2308 set_bits: ready 1
4601 7242258 [main] lat_select 2308 set_bits: me 0xA011778, testing fd 4 (/tmp/t904.0)
4422 7246680 [main] lat_select 2308 set_bits: ready 1
4597 7251277 [main] lat_select 2308 select_stuff::poll: returning 75
4576 7255853 [main] lat_select 2308 select_stuff::cleanup: calling cleanup routines
4623 7260476 [main] lat_select 2308 select_stuff::~select_stuff: deleting select
records
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
14184 7274660 [main] lat_select 2308 handle_exceptions: In cygwin_except_handler exc
0xC0000005 at 0xB0 sp 0x22F91C
I hope this help to fix this bug
Ralf
test.c
Description: Binary data
-- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
