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[Wed Dec 02 15:12:33.146349 2015] [core:error] [pid 14797] AH00046: child process 24537 still did not exit, sending a SIGKILL
[Wed Dec 02 15:12:33.147660 2015] [core:error] [pid 14797] AH00046: child process 24791 still did not exit, sending a SIGKILL
[Wed Dec 02 15:12:33.148833 2015] [core:error] [pid 14797] AH00046: child process 25277 still did not exit, sending a SIGKILL
[Wed Dec 02 15:12:33.149795 2015] [core:error] [pid 14797] AH00046: child process 27515 still did not exit, sending a SIGKILL
[Wed Dec 02 15:12:33.150903 2015] [core:error] [pid 14797] AH00046: child process 6535 still did not exit, sending a SIGKILL
[Wed Dec 02 15:12:34.154143 2015] [mpm_prefork:notice] [pid 14797] AH00169: caught SIGTERM, shutting down
[Wed Dec 02 15:12:34.845052 2015] [suexec:notice] [pid 30814] AH01232: suEXEC mechanism enabled (wrapper: /usr/lib/apache2/suexec)
[Wed Dec 02 15:12:34.872049 2015] [:notice] [pid 30815] mod_ruid2/0.9.8 enabled
[Wed Dec 02 15:12:34.874121 2015] [mpm_prefork:notice] [pid 30815] AH00163: Apache/2.4.7 (Ubuntu) mod_fcgid/2.3.9 PHP/5.5.9-1ubuntu4.14 OpenSSL/1.0.1f configured -- resuming normal operations
[Wed Dec 02 15:12:34.874143 2015] [core:notice] [pid 30815] AH00094: Command line: '/usr/sbin/apache2'
part of error logs posted,hope it will help
also there are some strange lines like \xe4\x6\ with the domain log
[Tue Dec 01 20:56:53.439928 2015] [:error] [pid 24533] [client 107.155.120.128:33321] WordPress\xe6\x95\xb0\xe6\x8d\xae\xe5\xba\x93\xe6\x9f\xa5\xe8\xaf\xa2SELECT t.*, tt.*, tr.object_id FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('category', 'post_tag', 'post_format') AND tr.object_id IN (197, 207, 210, 213, 220) ORDER BY t.name ASC\xe6\x97\xb6\xe5\x8f\x91\xe7\x94\x9fGot error -1 from storage engine\xe9\x94\x99\xe8\xaf\xaf\xef\xbc\x8c\xe8\xbf\x99\xe6\x98\xaf\xe7\x94\xb1require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/twentyeleven/archive.php'), get_sidebar, locate_template, load_template, require_once('/themes/twentyeleven/sidebar.php'), dynamic_sidebar