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From Ruediger Pluem <rpl...@apache.org>
Subject Re: Broken: apache/httpd#1667 (2.4.x - 59393dd)
Date Thu, 03 Jun 2021 18:27:29 GMT


On 6/3/21 7:23 PM, Travis CI wrote:
> apache
> 
> /
> 
> httpd
> 
> <https://travis-ci.com/github/apache/httpd?utm_medium=notification&utm_source=email>
> 
> branch icon2.4.x <https://github.com/apache/httpd/tree/2.4.x>
> 
> build has failed
> Build #1667 was broken <https://travis-ci.com/github/apache/httpd/builds/227897922?utm_medium=notification&utm_source=email>
> arrow to build time
> clock icon19 mins and 23 secs
> 
> Eric Covener avatarEric Covener
> 
> 59393dd CHANGESET → <https://github.com/apache/httpd/compare/e4bbe0e31a52...59393dd87f5e>
> 
> correct CVE year
> 

Looking at the stack trace, would we need to call apr_setup_signal_thread() (if we have APR_THREADS)
before we run
ap_run_child_init and unblock all signals afterwards in case one of the init child hooks creates
threads like mod_watchdog does?

Thread 2 (Thread 0x7f4c98b2cbc0 (LWP 6768)):
#0  run_cleanups (cref=0x55753eaa5930) at memory/unix/apr_pools.c:2704
#1  pool_clear_debug (pool=pool@entry=0x55753eaa58a0, file_line=0x7f4c971a9eda "prefork.c:227")
at memory/unix/apr_pools.c:1839
#2  0x00007f4c982540e9 in pool_destroy_debug (pool=0x55753eaa58a0, file_line=<optimized
out>) at memory/unix/apr_pools.c:1937
#3  0x00007f4c98254960 in apr_pool_destroy_debug (pool=0x55753eaa58a0, file_line=0x7f4c971a9eda
"prefork.c:227") at
memory/unix/apr_pools.c:1986
#4  0x00007f4c971a825a in clean_child_exit (code=code@entry=0) at prefork.c:227
#5  0x00007f4c971a829b in just_die (sig=<optimized out>) at prefork.c:355
#6  <signal handler called>
#7  0x00007f4c97d36cb9 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#8  0x00007f4c9825e24b in poll (__timeout=2000, __nfds=1, __fds=0x7ffd22f53c90) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#9  apr_wait_for_io_or_timeout (f=f@entry=0x0, s=s@entry=0x55753e85a9a0, for_read=for_read@entry=1)
at support/unix/waitio.c:51
#10 0x00007f4c9825796a in apr_socket_recv (sock=sock@entry=0x55753e85a9a0, buf=buf@entry=0x7ffd22f53cf0
"\220\063\310>uU",
len=len@entry=0x7ffd22f53ce8) at network_io/unix/sendrecv.c:87
#11 0x000055753da86db4 in ap_lingering_close (c=c@entry=0x55753e8879f0) at connection.c:182
#12 0x00007f4c971a883d in child_main (child_num_arg=child_num_arg@entry=6, child_bucket=child_bucket@entry=0)
at prefork.c:616
#13 0x00007f4c971a8b34 in make_child (s=0x55753eb0a1a0, slot=6) at prefork.c:717
#14 0x00007f4c971a958e in perform_idle_server_maintenance (p=<optimized out>) at prefork.c:821
#15 prefork_run (_pconf=<optimized out>, plog=<optimized out>, s=<optimized
out>) at prefork.c:1014
#16 0x000055753da5e9fe in ap_run_mpm (pconf=0x55753e703bb0, plog=0x55753e732c10, s=0x55753eb0a1a0)
at mpm_common.c:94
#17 0x000055753da568d5 in main (argc=<optimized out>, argv=<optimized out>) at
main.c:819

Thread 1 (Thread 0x7f4c7a55d700 (LWP 6769)):
#0  0x00007f4c7fe70be0 in ?? () from /lib/x86_64-linux-gnu/libgpg-error.so.0
#1  0x00007f4c97c65161 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007f4c97c6525a in exit () from /lib/x86_64-linux-gnu/libc.so.6
#3  0x00007f4c971a827a in clean_child_exit (code=code@entry=0) at prefork.c:236
#4  0x00007f4c971a829b in just_die (sig=<optimized out>) at prefork.c:355
#5  <signal handler called>
#6  0x00007f4c97d38e1f in select () from /lib/x86_64-linux-gnu/libc.so.6
#7  0x00007f4c9825ff75 in apr_sleep (t=t@entry=100000) at time/unix/time.c:246
#8  0x00007f4c8f625e58 in wd_worker (thread=<optimized out>, data=0x55753ec281f0) at
mod_watchdog.c:159
#9  0x00007f4c9825f53f in dummy_worker (opaque=0x55753eb5c160) at threadproc/unix/thread.c:147
#10 0x00007f4c9801a6db in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#11 0x00007f4c97d4371f in clone () from /lib/x86_64-linux-gnu/libc.so.6

Regards

Rüdiger

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