https://bz.apache.org/bugzilla/show_bug.cgi?id=60869
Bug ID: 60869
Summary: Workers locking up instead finishing during eg.
graceful reload
Product: Apache httpd-2
Version: 2.4.25
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_http2
Assignee: bugs@httpd.apache.org
Reporter: b...@bszx.eu
Target Milestone: ---
Created attachment 34829
--> https://bz.apache.org/bugzilla/attachment.cgi?id=34829&action=edit
server status
Tested on prefork mpm and event mpm.
How to reproduce:
- enable mod_http2
- start apache
$ ./apachectl start
- reload apache
$ ./apachectl graceful
After this all existing workers are locked up in finishing state like in
attached server status:
Srv PID Acc M CPU SS Req Conn Child Slot
Client Protocol VHost Request
0-0 9684 0/0/0 G 0.00 52 0 0.0 0.00 0.00
1-0 9685 0/0/0 G 0.00 52 0 0.0 0.00 0.00
2-0 9686 0/3/3 G 0.00 26 0 0.0 0.00 0.00
127.0.0.1 http/1.1 127.0.0.1:8081 GET /favicon.ico HTTP/1.1
3-0 9687 0/0/0 G 0.00 52 0 0.0 0.00 0.00
4-0 9688 0/0/0 G 0.00 52 0 0.0 0.00 0.00
5-0 9695 0/0/0 G 0.00 31 0 0.0 0.00 0.00
6-1 9701 0/0/0 W 0.00 0 0 0.0 0.00 0.00
127.0.0.1 http/1.1 127.0.0.1:8081 GET /server-status HTTP/1.1
$ strace -f -p 9684
strace: Process 9684 attached with 2 threads
[pid 9690] futex(0x1208718, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 9684] futex(0x1208714, FUTEX_WAIT_PRIVATE, 12, NULL
$ gdb -p 9684
(gdb) thread apply all bt
Thread 2 (Thread 0x7f05a9c93700 (LWP 9690)):
#0 0x00007f05ae69f9f6 in futex_wait_cancelable (private=<optimized out>,
expected=0, futex_word=0x1208718)
at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1 __pthread_cond_wait_common (abstime=0x0, mutex=0x12086a0, cond=0x12086f0)
at pthread_cond_wait.c:502
#2 __pthread_cond_wait (cond=0x12086f0, mutex=0x12086a0) at
pthread_cond_wait.c:655
#3 0x00007f05ab155ba1 in get_mplx_next (worker=0x1208790, ctx=0x12085a0,
ptask=0x7f05a9c92ea8, psticky=0x7f05a9c92eb4) at h2_workers.c:160
#4 0x00007f05ab155049 in execute (thread=0x12087d0, wctx=0x1208790) at
h2_worker.c:43
#5 0x00007f05ae699550 in start_thread (arg=0x7f05a9c93700) at
pthread_create.c:456
#6 0x00007f05ae1d49af in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:94
#7 0x0000000000000000 in ?? ()
Thread 1 (Thread 0x7f05af7af540 (LWP 9684)):
#0 0x00007f05ae69f539 in futex_wait (private=<optimized out>, expected=12,
futex_word=0x1208714)
at ../sysdeps/unix/sysv/linux/futex-internal.h:61
#1 futex_wait_simple (private=<optimized out>, expected=12,
futex_word=0x1208714) at ../sysdeps/nptl/futex-internal.h:135
#2 __pthread_cond_destroy (cond=0x12086f0) at pthread_cond_destroy.c:54
#3 0x00007f05aead226e in run_cleanups (cref=<optimized out>) at
memory/unix/apr_pools.c:2352
#4 apr_pool_destroy (pool=0x1208528) at memory/unix/apr_pools.c:814
#5 0x00007f05aead2245 in apr_pool_destroy (pool=0x1204508) at
memory/unix/apr_pools.c:811
#6 0x00007f05aace3c89 in clean_child_exit (code=0) at prefork.c:227
#7 0x00007f05aace5052 in child_main (child_num_arg=0, child_bucket=0) at
prefork.c:744
#8 0x00007f05aace524e in make_child (s=0x118e3d0, slot=0, bucket=0) at
prefork.c:824
#9 0x00007f05aace52ed in startup_children (number_to_start=5) at prefork.c:843
#10 0x00007f05aace58bf in prefork_run (_pconf=0x1167138, plog=0x1194358,
s=0x118e3d0) at prefork.c:1010
#11 0x0000000000434033 in ap_run_mpm (pconf=0x1167138, plog=0x1194358,
s=0x118e3d0) at mpm_common.c:94
#12 0x000000000042b1b3 in main (argc=3, argv=0x7ffc5e108828) at main.c:783
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