sendto with EBADF

Hello,

I used curl-master as of 3rd June (wanted to verify a bug #3904),
although now original core dump is not seen, after few transfers
application is not processing new messages and seem to be taking 100%
CPU. I need to check if its libcurl issue or application issue.

After some traffic(HTTP/2), the application goes to 100% CPU.

Following is strace during the scenario:

sendto(-1, "POST /worker/help1"..., 155, MSG_NOSIGNAL, NULL, 0) = -1
EBADF (Bad file descriptor)

sendto(-1, "POST /worker/help1"..., 155, MSG_NOSIGNAL, NULL, 0) = -1
EBADF (Bad file descriptor)

sendto(-1, "POST /worker/help1"..., 155, MSG_NOSIGNAL, NULL, 0) = -1
EBADF (Bad file descriptor)

sendto(-1, "P

…

sendto seems be in some tight loop with bad file descriptor.

gcore has following top frames:

#0 0x00007fd64f95fb7d in Curl_connect () from /usr/lib/libBase.so

#1 0x00007fd64f93d10f in multi_runsingle () from /usr/lib/libBase.so

#2 0x00007fd64f93e6ae in multi_socket () from /usr/lib/libBase.so

#3 0x00007fd64f93e805 in curl_multi_socket_action () from /usr/lib/libBase.so

and

#0 0x00007f0ee5c0a09e in send () from /usr/lib64/libpthread.so.0

#1 0x00007f0f01175970 in Curl_send_plain () from /usr/lib/libBase.so

#2 0x00007f0f0117540d in Curl_write () from/usr/lib/libBase.so

#3 0x00007f0f01171268 in Curl_add_buffer_send () from/usr/lib/libBase.so

#4 0x00007f0f011728b9 in Curl_http () from /usr/lib/libBase.so

#5 0x00007f0f01157706 in multi_runsingle () from /usr/lib/libBase.so

#6 0x00007f0f011586ae in multi_socket () from /usr/lib/libBase.so

#7 0x00007f0f01158805 in curl_multi_socket_action () from /usr/lib/libBase.so

#8 0x00007f0f010e37dd in HttpClient::TimerTriggered (this=0x3c1f4b0)
at httpClient.cc:287

Any idea when such case can occur ?

Thanks,
~Kunal

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Received on 2019-06-04