curl_easy_perform hangs in poll

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Hello,

I'm looking into an issue I am observing when running curl_easy_perform i=
n a loop. After some amount of iterations, the program becomes stuck insi=
de of poll.=20

The stack trace looks like this with gdb:
#0  0x00007f9b88b25e84 in poll () from /lib64/libc.so.6
#1  0x000000000047b1fd in Curl_poll (ufds=3D0x7ffdd0fcd6d0, nfds=3D2, tim=
eout_ms=3D1000) at select.c:313
#2  0x000000000046fbc9 in multi_wait (multi=3D0x319033c8, extra_fds=3D0x0=
, extra_nfds=3D0, timeout_ms=3D1000, ret=3D0x0, extrawait=3Dtrue, use_wak=
eup=3Dtrue) at multi.c:1366
#3  0x000000000046fe65 in curl_multi_poll (multi=3D0x319033c8, extra_fds=3D=
0x0, extra_nfds=3D0, timeout_ms=3D1000, ret=3D0x0) at multi.c:1509
#4  0x0000000000461bfb in easy_transfer (multi=3D0x319033c8) at easy.c:69=
8
#5  0x0000000000461e14 in easy_perform (data=3D0x31900e48, events=3Dfalse=
) at easy.c:796
#6  0x0000000000461e4c in curl_easy_perform (data=3D0x31900e48) at easy.c=
:815
#7  0x0000000000460d19 in main (argc=3D1, argv=3D0x7ffdd0fcd9a8) at curl_=
test.c:24

And with strace:
recvfrom(6, "g}\10\341C=3D\7\260\336\256I&\1\362\225CBw\37\200\17\272~W\2=
61\273/E/hGr"..., 16384, 0, NULL, NULL) =3D 1448
recvfrom(6, 0x1783298, 16384, 0, NULL, NULL) =3D -1 EAGAIN (Resource temp=
orarily unavailable)
poll([{fd=3D6, events=3DPOLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) =3D=
 0 (Timeout)
poll([{fd=3D6, events=3DPOLLIN}, {fd=3D3, events=3DPOLLIN}], 2, 1000) =3D=
 0 (Timeout)
recvfrom(6, 0x1783298, 16384, 0, NULL, NULL) =3D -1 EAGAIN (Resource temp=
orarily unavailable)
poll([{fd=3D6, events=3DPOLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) =3D=
 0 (Timeout)
poll([{fd=3D6, events=3DPOLLIN}, {fd=3D3, events=3DPOLLIN}], 2, 1000) =3D=
 1 ([{fd=3D6, revents=3DPOLLIN}])
recvfrom(6, "\211\277\231@\240\373\367\330\212\214\317\233\37\212\201\246=
[\276{\375\214?\222K\317|\247\n~>b\230"..., 16384, 0, NULL, NULL) =3D 144=
8
recvfrom(6, 0x1783298, 16384, 0, NULL, NULL) =3D -1 EAGAIN (Resource temp=
orarily unavailable)
poll([{fd=3D6, events=3DPOLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) =3D=
 0 (Timeout)
poll([{fd=3D6, events=3DPOLLIN}, {fd=3D3, events=3DPOLLIN}], 2, 1000) =3D=
 0 (Timeout)
recvfrom(6, 0x1783298, 16384, 0, NULL, NULL) =3D -1 EAGAIN (Resource temp=
orarily unavailable)
poll([{fd=3D6, events=3DPOLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) =3D=
 0 (Timeout)
poll([{fd=3D6, events=3DPOLLIN}, {fd=3D3, events=3DPOLLIN}], 2, 1000) =3D=
 1 ([{fd=3D6, revents=3DPOLLIN}])
recvfrom(6, "ub\v\37\321\1\6\317\217\305c\221K\306\177\243\315\261\4\337\=
276|\354*\315\201\355\316\257\306'D"..., 16384, 0, NULL, NULL) =3D 1448
recvfrom(6, 0x1783298, 16384, 0, NULL, NULL) =3D -1 EAGAIN (Resource temp=
orarily unavailable)
poll([{fd=3D6, events=3DPOLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) =3D=
 0 (Timeout)
poll([{fd=3D6, events=3DPOLLIN}, {fd=3D3, events=3DPOLLIN}], 2, 1000) =3D=
 0 (Timeout)=20

I've so far tested this with an FTP server via vsftpd v2.3.4 using curl v=
8.20. I tested on a fedora linux machine I initially thought this was rel=
ated to my use of CURLOPT_FORBID_REUSE =3D 1, but I reproduced this behav=
ior using CURLOPT_FRESH_CONNECT =3D 1 instead (i.e. FRESH_CONNECT =3D 1, =
FORBID_REUSE =3D 0). I can't say for certain whether or not this is a bug=
 with my ancient FTP server. I can get around the hang by using a nonzero=
 CURLOPT_TIMEOUT, though this is not addressing the root cause. I've incl=
uded the source of a simple C program to reproduce this and a logfile pro=
duced with CURLOPT_VERBOSE. After a while of being in this state, I obser=
ve with netstat that the client machine has a socket to port 21 on the se=
rver machine that is in a CLOSE_WAIT state. Is this a problem seen elsewh=
ere? I'm curious if this is a misuse of the curl_easy API and if I ought =
to use the curl_multi API for this "many repeat transfers" task. I've tri=
mmed the curl log to 100 lines for the sake of brevity.=20

Thanks,
Wyatt

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