[Sun Sep 30 17:43:21.279420 2018] [perl:error] [pid 2623] [client 173.33.188.65:
3700] [/webwork2/MAT135Y5_All/1/3/] :Apache2 IO write: (32) Broken pipe at /opt/
webwork/webwork2/lib/WeBWorK/ContentGenerator/Problem.pm line 1215\n * in WeBWor
K::ContentGenerator::Problem::output_problem_body called at line 155 of /opt/web
work/webwork2/lib/WeBWorK/Template.pm\n * in WeBWorK::Template::template called
at line 560 of /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator.pm\n * in WeBW
orK::ContentGenerator::content called at line 356 of /opt/webwork/webwork2/lib/W
eBWorK/ContentGenerator/Problem.pm\n * in WeBWorK::ContentGenerator::Problem::co
ntent called at line 232 of /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator.p
m\n * in WeBWorK::ContentGenerator::go called at line 410 of /opt/webwork/webwor
k2/lib/WeBWorK.pm, referer: https://webworkq.act.utoronto.ca/webwork2/MAT135Y5_A
ll/1/3/?effectiveUser=xxxx.xxx@mail.utoronto.ca&user=xxxx.xxx@mail.utoro
nto.ca&key=xxxxxxxxxxxxxxxxxx
It looks like this user did something at that time and made those error records in log file. I don’t know what operation from user can make so many error within one minute? I'd like to know whether somebody else meet this issue too or can give an explanation to it?