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[Bug 61551] Event MPM workers stuck in Gracefully Finishing with no connections left


https://bz.apache.org/bugzilla/show_bug.cgi?id=61551

--- Comment #2 from Nic Jansma <nic@xxxxxxxx> ---
Full bt of all threads here:

https://pastebin.com/vK0rBSpP

Summary:

* 95 threads look like this:

Thread 47 (Thread 0x7fce21f66700 (LWP 5999)):
#0  0x00007fce62a24945 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1  0x00007fce5bd13598 in get_next (slot=0x7fce652494b8) at h2_workers.c:206
#2  slot_run (thread=0x7fce65492c58, wctx=0x7fce652494b8) at h2_workers.c:225
#3  0x00007fce62a20e25 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fce6254a34d in clone () from /lib64/libc.so.6

* 43 threads look like this:

#0  0x00007fce62a24945 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1  0x00007fce563d7115 in ap_queue_pop_something (queue=0x7fce651ee5c0,
sd=0x7fcdfc7bfd30, ecs=0x7fcdfc7bfd38, p=0x7fcdfc7bfd40, te_out=0x7fcdfc7bfd48)
at fdqueue.c:451
#2  0x00007fce563d35be in worker_thread (thd=<optimized out>, dummy=<optimized
out>) at event.c:1807
#3  0x00007fce62a20e25 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fce6254a34d in clone () from /lib64/libc.so.6

* Then these two threads:

Thread 2 (Thread 0x7fcdfbfbf700 (LWP 6275)):
#0  0x00007fce6254a923 in epoll_wait () from /lib64/libc.so.6
#1  0x00007fce62c58453 in impl_pollset_poll (pollset=0x7fce1c0009b0,
timeout=<optimized out>, num=0x7fcdfbfbed2c, descriptors=0x7fcdfbfbed48) at
poll/unix/epoll.c:266
#2  0x00007fce563d546c in listener_thread (thd=0x7fce1c04ca38, dummy=<optimized
out>) at event.c:1460
#3  0x00007fce62a20e25 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fce6254a34d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fce63f188c0 (LWP 5502)):
#0  0x00007fce62a21f57 in pthread_join () from /lib64/libpthread.so.0
#1  0x00007fce62c5cecb in apr_thread_join (retval=retval@entry=0x7ffe4f92f704,
thd=thd@entry=0x7fce1c04ca38) at threadproc/unix/thread.c:217
#2  0x00007fce563d083c in join_workers (listener=0x7fce1c04ca38,
threads=threads@entry=0x7fce654c9b00) at event.c:2084
#3  0x00007fce563d0c11 in child_main (child_num_arg=child_num_arg@entry=1,
child_bucket=child_bucket@entry=0) at event.c:2282
#4  0x00007fce563d40d7 in make_child (s=0x7fce6515b400, slot=slot@entry=1,
bucket=0) at event.c:2353
#5  0x00007fce563d4174 in startup_children (number_to_start=4,
number_to_start@entry=5) at event.c:2377
#6  0x00007fce563d4e80 in event_run (_pconf=<optimized out>,
plog=0x7fce65161388, s=0x7fce6515b400) at event.c:2725
#7  0x00007fce63f8556e in ap_run_mpm (pconf=pconf@entry=0x7fce65134168,
plog=0x7fce65161388, s=0x7fce6515b400) at mpm_common.c:94
#8  0x00007fce63f7df03 in main (argc=2, argv=0x7ffe4f92fba8) at main.c:792
A debugging session is active.

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