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Reply to topic   Topic: Apache Httpd process crashes
Author
asafsteier



Joined: 10 Apr 2022
Posts: 7
Location: Tel Aviv, Israel

PostPosted: Sun 10 Apr '22 11:42    Post subject: Apache Httpd process crashes Reply with quote

Hi,

I'm using httpd 2.4.52 and openssl 1.1.1m on windows.

Apache crashes and I get the following error in the apache log:
AH00428: Parent: child process exited with status 3221226356 -- Restarting

It seems to be happening at times when child process exists (graceful restart on max connections) and there's a number of websocket connections that are present at that time. MaxConnectionsPerChild is set to 2M.


Backtrace:

mod_proxy.so!connection_cleanup(void * theconn) Line 1555 C
mod_proxy.so!ap_proxy_release_connection(const char * proxy_function, proxy_conn_rec * conn, server_rec * s) Line 2551 C
[Inline Frame] mod_proxy_http.so!ap_proxy_http_cleanup(const char *) Line 1807 C
mod_proxy_http.so!proxy_http_handler(request_rec * r, proxy_worker * worker, proxy_server_conf * conf, char * url, const char * proxyname, unsigned short proxyport) Line 2049 C
mod_proxy.so!proxy_run_scheme_handler(request_rec * r, proxy_worker * worker, proxy_server_conf * conf, char * url, const char * proxyhost, unsigned short proxyport) Line 3432 C
mod_proxy.so!proxy_handler(request_rec * r) Line 1507 C
libhttpd.dll!ap_run_handler(request_rec * r) Line 169 C
libhttpd.dll!ap_invoke_handler(request_rec * r) Line 445 C
libhttpd.dll!ap_process_async_request(request_rec * r) Line 452 C
libhttpd.dll!ap_process_request(request_rec * r) Line 489 C
libhttpd.dll!ap_process_http_sync_connection(conn_rec * c) Line 219 C
libhttpd.dll!ap_run_process_connection(conn_rec * c) Line 42 C
libhttpd.dll!ap_process_connection(conn_rec * c, void * csd) Line 219 C
libhttpd.dll!worker_main(void * thread_num_val) Line 835 C
kernel32.dll!BaseThreadInitThunk () Unknown
ntdll.dll!00007ffd803f1791() Unknown


Has anyone encountered a similar issue? Any ideas how to resolve?

Thanks!
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Otomatic



Joined: 01 Sep 2011
Posts: 93
Location: Paris, France, EU

PostPosted: Sun 10 Apr '22 14:20    Post subject: Reply with quote

In the httpd.conf file, is there :
Code:
# AcceptFilter: On Windows, none uses accept() rather than AcceptEx() and
# will not recycle sockets between connections. This is useful for network
# adapters with broken driver support, as well as some virtual network
# providers such as vpn drivers, or spam, virus or spyware filters.
AcceptFilter http none
AcceptFilter https none

# ThreadStackSize: sets the size of the stack (for autodata)
# of threads which handle client connections and call modules to help process
# those connections. In most cases the operating system default for stack size
# is reasonable, but there are some conditions where it may need to be adjusted.
# Apache httpd may crash when using some third-party modules which use a
# relatively large amount of autodata storage or automatically restart with
# message like: child process 12345 exited with status 3221225725 -- Restarting.
# This type of crash is resolved by setting ThreadStackSize to a value higher
# than the operating system default.
ThreadStackSize 8388608
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asafsteier



Joined: 10 Apr 2022
Posts: 7
Location: Tel Aviv, Israel

PostPosted: Mon 11 Apr '22 10:16    Post subject: Reply with quote

Here's the setting that I have:
<IfModule mpm_winnt_module>
ThreadStackSize 500000
</IfModule>

It did not make a difference.
Also, notice the exist code is different - im getting heap corruption
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 7148
Location: Germany, Next to Hamburg

PostPosted: Mon 11 Apr '22 11:32    Post subject: Reply with quote

The exit code 0xC0000374 is the value returned when heap corruption is detected.

There is often that issue when running PHP as a module in apache.

You can use the forum search and look for 3221226356
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asafsteier



Joined: 10 Apr 2022
Posts: 7
Location: Tel Aviv, Israel

PostPosted: Tue 12 Apr '22 13:46    Post subject: Reply with quote

Thanks. I don't use PHP. I've searched the forum but could not find anything relevant
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asafsteier



Joined: 10 Apr 2022
Posts: 7
Location: Tel Aviv, Israel

PostPosted: Wed 13 Apr '22 14:28    Post subject: Reply with quote

Another thing to mention: we noticed that when the child process is exiting, the crash comes from trying to clean a pool resource (e.g. a connection pool) that was already destroyed before as a decendant of the main process pool
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 7148
Location: Germany, Next to Hamburg

PostPosted: Tue 03 May '22 8:34    Post subject: Reply with quote

Do you set the following as Otomatic suggested?

AcceptFilter http none
AcceptFilter https none
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asafsteier



Joined: 10 Apr 2022
Posts: 7
Location: Tel Aviv, Israel

PostPosted: Tue 03 May '22 14:32    Post subject: Reply with quote

Thanks JB, yes we already have those
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 7148
Location: Germany, Next to Hamburg

PostPosted: Wed 04 May '22 8:39    Post subject: Reply with quote

I would give it a try to increase ThreadStackSizeby a lot.

Your value is very low.

0500000 your value
8388608 default value.

The default 8388608 is only 8 MiB.

or increase the number of Threads Per Child. The default of 64 for windows can be too low. On my productive systems, I use 150

Code:

ThreadsPerChild      150


3221226356 aka heap corruption is that the buffer is too small.
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