Child process sometimes hang, peg cpu @ 100%

[Adam7288]

Here is pstack trace for one of the hung processes pegging cpu @ 100% - looks like some kind of deadlock

#0 __lll_unlock_wake () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:371
#1 0x00007f2d659f0f9e in _L_unlock_738 () from /lib64/libpthread.so.0
#2 0x00007f2d659f0f10 in __pthread_mutex_unlock_usercnt (decr=1, mutex=0x7f2c7c5248f8) at pthread_mutex_unlock.c:55
#3 __GI___pthread_mutex_unlock (mutex=0x7f2c7c5248f8) at pthread_mutex_unlock.c:330
#4 0x00007f2d57cb140d in h2_beam_receive () from /etc/httpd/modules/mod_http2.so
#5 0x00007f2d57cc8ee3 in buffer_output_receive () from /etc/httpd/modules/mod_http2.so
#6 0x00007f2d57ccb1ec in stream_data_cb () from /etc/httpd/modules/mod_http2.so
#7 0x00007f2d66cba171 in nghttp2_session_pack_data () from /lib64/libnghttp2.so.14
#8 0x00007f2d66cbaedd in nghttp2_session_mem_send_internal () from /lib64/libnghttp2.so.14
#9 0x00007f2d66cbbae9 in nghttp2_session_send () from /lib64/libnghttp2.so.14
#10 0x00007f2d57cc7544 in h2_session_send () from /etc/httpd/modules/mod_http2.so
#11 0x00007f2d57cc777a in h2_session_process () from /etc/httpd/modules/mod_http2.so
#12 0x00007f2d57cb2149 in h2_c1_run () from /etc/httpd/modules/mod_http2.so
#13 0x00007f2d57cb2569 in h2_c1_hook_process_connection () from /etc/httpd/modules/mod_http2.so
#14 0x00005571f66c33c0 in ap_run_process_connection (c=c@entry=0x7f2d4006d5e0) at connection.c:42
#15 0x00007f2d5a8ab40a in process_socket (thd=thd@entry=0x5571f72c4510, p=, sock=, cs=0x7f2d4006d530, my_child_num=my_child_num@entry=11, my_thread_num=my_thread_num@entry=12) at event.c:1086
#16 0x00007f2d5a8ae6ae in worker_thread (thd=0x5571f72c4510, dummy=) at event.c:2179
#17 0x00007f2d659edea5 in start_thread (arg=0x7f2d3a7f4700) at pthread_create.c:307
#18 0x00007f2d65512b0d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

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