> On 17 Aug 2018, at 10:41, Stefaan Vanbillemont
> <[email protected]> wrote:
>
> When we execute the command ‘systemctl reload httpd’ several times after each
> other
Do you know what that does under the hood? I'd guess it either wraps or
replaces apachectl on your system and performs restart, probably graceful.
A graceful restart is rather slow: it takes time to complete requests it is
serving
rather than abort anything mid-request. If you restart again while an already-
closing-down-and-orphaned process is still running, you're putting yourself at
high risk of edge-case crashes.
> Backtrace:
Hehehe. Verily, JSON is the new XML: let's wrap everything!
> core_backtrace:
> :{ "signal": 11
> :, "executable": "/usr/sbin/httpd"
> :, "stacktrace":
> : [ { "crash_thread": true
> : , "frames":
> : [ { "address": 140274079464508
> : , "build_id": "cb4b7554d1adbef2f001142dd6f0a5139fc9aa69"
> : , "build_id_offset": 547900
> : , "function_name": "__libc_free"
> : , "file_name": "/usr/lib64/libc-2.17.so"
> : }
Smells of shutdown race condition there (and throughout). What's it seeking to
free?
It's coming from deep in layers of third-party libs, and it even looks as if
php/zend
is managing mysql directly rather than using apr_dbd. There's nothing from any
Apache-related software until:
> : , { "address": 140274087330830
> : , "build_id": "89ceb54f2d4d09bff13fc2fe35390934ec9e2581"
> : , "build_id_offset": 103438
> : , "function_name": "apr_pool_clear"
> : , "file_name": "/usr/lib64/libapr-1.so.0.4.8”
> : }
That's a bizarre filename, and gives no clue what APR version you're using!
A recent stable libapr would be 1.6.x.
> When we remove php72w-mysql package from our server the problem disappears.
Removing php is a fine solution to many problems. A second-best that might
work for you is to use it in a fastcgi configuration rather than loaded into
the server.
--
Nick Kew
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