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output filters infinite loop #206

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yyamano opened this issue Aug 23, 2016 · 2 comments
Open

output filters infinite loop #206

yyamano opened this issue Aug 23, 2016 · 2 comments

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@yyamano
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yyamano commented Aug 23, 2016

The following configuration can cause an infinite loop.

        location /content_handler_with_header_filter {
            mruby_content_handler_code 'Nginx.rputs "OK"';
            mruby_output_header_filter_code 'Nginx::Request.new.headers_out["X-New-Header"] = "header_filetr"';
        }

        location /content_handler_with_body_filter {
            mruby_content_handler_code 'Nginx.rputs "OK"';
            mruby_output_body_filter_code '
              f = Nginx::Filter.new
              f.body = f.body + "(processed by body_filter)"
            ';
        }

        location /content_handler_with_header_and_body_filter {
            mruby_content_handler_code 'Nginx.rputs "OK"';
            mruby_output_header_filter_code 'Nginx::Request.new.headers_out["X-New-Header"] = "header_filetr"';
            mruby_output_body_filter_code '
              f = Nginx::Filter.new
              f.body = f.body + "(processed by body_filter)"
            ';
        }

Here is the backtrace.

2016/08/23 03:19:59 [info] 7488#0: *1 ngx_mruby INFO ngx_mrb_run:822: mrb_run info: rputs_chain is null and return NGX_OK, client: 127.0.0.1, server: localhost, request: "GET /content_handler_with_header_filter HTTP/1.1", host: "localhost:58080"

Program received signal SIGSEGV, Segmentation fault.
0x00000000004da9fd in mrb_get_args (mrb=mrb@entry=0xb34830, format=format@entry=0x76b673 "|i")
    at /home/vagrant/ngx_mruby/mruby/src/class.c:478
478   va_start(ap, format);
Missing separate debuginfos, use: debuginfo-install glibc-2.17-106.el7_2.6.x86_64 nss-softokn-freebl-3.16.2.3-13.el7_1.x86_64 openssl-libs-1.0.1e-51.el7_2.5.x86_64 pcre-8.32-15.el7_2.1.x86_64 zlib-1.2.7-15.el7.x86_64
#0  0x00000000004da9fd in mrb_get_args (mrb=mrb@entry=0xb34830, format=format@entry=0x76b673 "|i")
    at /home/vagrant/ngx_mruby/mruby/src/class.c:478
#1  0x000000000050a0d1 in mrb_ary_first (mrb=0xb34830, self=...) at /home/vagrant/ngx_mruby/mruby/src/array.c:828
#2  0x00000000004febe6 in mrb_funcall_with_block (mrb=mrb@entry=0xb34830, self=..., mid=156, argc=argc@entry=0, 
    argv=0x7fffff7ff290, blk=...) at /home/vagrant/ngx_mruby/mruby/src/vm.c:407
#3  0x00000000004ff502 in mrb_funcall_argv (argv=0x7fffff7ff290, argc=0, mid=<optimized out>, self=..., mrb=0xb34830)
    at /home/vagrant/ngx_mruby/mruby/src/vm.c:424
#4  mrb_funcall (mrb=mrb@entry=0xb34830, self=..., name=name@entry=0x736a35 "first", argc=argc@entry=0)
    at /home/vagrant/ngx_mruby/mruby/src/vm.c:319
#5  0x00000000004d40d9 in ngx_mrb_get_request_header (mrb=mrb@entry=0xb34830, headers=headers@entry=0xb2adc0, 
    mkey=mkey@entry=0x13b2d30 "X-New-Headerheader_filetrX-New-Header", mlen=mlen@entry=12)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:252
#6  0x00000000004d4576 in ngx_mrb_set_request_header (mrb=mrb@entry=0xb34830, headers=headers@entry=0xb2adc0, 
    pool=<optimized out>, mrb_key=..., mrb_val=..., update=update@entry=1)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:348
#7  0x00000000004d479c in ngx_mrb_set_request_headers_out (mrb=0xb34830, self=...)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:559
#8  0x00000000004fbc09 in mrb_vm_exec (mrb=mrb@entry=0xb34830, proc=<optimized out>, proc@entry=0xb831f0, pc=0xc0819c)
    at /home/vagrant/ngx_mruby/mruby/src/vm.c:1150
#9  0x000000000050132e in mrb_vm_run (stack_keep=<optimized out>, self=..., proc=0xb831f0, mrb=0xb34830)
    at /home/vagrant/ngx_mruby/mruby/src/vm.c:759
#10 mrb_run (mrb=0xb34830, proc=0xb831f0, self=...) at /home/vagrant/ngx_mruby/mruby/src/vm.c:2424
#11 0x00000000004ce46b in ngx_mrb_run (r=r@entry=0xb2abf0, state=0xb25628, code=0xbfda08, cached=0, result=result@entry=0x0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:778
#12 0x00000000004ce7d4 in ngx_http_mruby_header_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2130
#13 0x00000000004d0e5f in ngx_http_mruby_header_filter (r=0xb2abf0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2179
#14 0x00000000004abc2a in ngx_http_not_modified_header_filter (r=<optimized out>)
    at src/http/modules/ngx_http_not_modified_filter_module.c:108
#15 0x0000000000484a00 in ngx_http_send_header (r=r@entry=0xb2abf0) at src/http/ngx_http_core_module.c:1955
#16 0x00000000004ce754 in ngx_mrb_run (r=r@entry=0xb2abf0, state=<optimized out>, code=0xbfda08, cached=0, 
    result=result@entry=0x0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:832
#17 0x00000000004ce7d4 in ngx_http_mruby_header_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2130
#18 0x00000000004d0e5f in ngx_http_mruby_header_filter (r=0xb2abf0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2179
#19 0x00000000004abc2a in ngx_http_not_modified_header_filter (r=<optimized out>)
    at src/http/modules/ngx_http_not_modified_filter_module.c:108
#20 0x0000000000484a00 in ngx_http_send_header (r=r@entry=0xb2abf0) at src/http/ngx_http_core_module.c:1955
#21 0x00000000004ce754 in ngx_mrb_run (r=r@entry=0xb2abf0, state=<optimized out>, code=0xbfda08, cached=0, 
    result=result@entry=0x0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:832
#22 0x00000000004ce7d4 in ngx_http_mruby_header_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2130
#23 0x00000000004d0e5f in ngx_http_mruby_header_filter (r=0xb2abf0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2179
#24 0x00000000004abc2a in ngx_http_not_modified_header_filter (r=<optimized out>)
    at src/http/modules/ngx_http_not_modified_filter_module.c:108
#25 0x0000000000484a00 in ngx_http_send_header (r=r@entry=0xb2abf0) at src/http/ngx_http_core_module.c:1955
#26 0x00000000004ce754 in ngx_mrb_run (r=r@entry=0xb2abf0, state=<optimized out>, code=0xbfda08, cached=0, 
    result=result@entry=0x0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:832
#27 0x00000000004ce7d4 in ngx_http_mruby_header_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2130
#28 0x00000000004d0e5f in ngx_http_mruby_header_filter (r=0xb2abf0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2179
#29 0x00000000004abc2a in ngx_http_not_modified_header_filter (r=<optimized out>)
    at src/http/modules/ngx_http_not_modified_filter_module.c:108
#30 0x0000000000484a00 in ngx_http_send_header (r=r@entry=0xb2abf0) at src/http/ngx_http_core_module.c:1955
#31 0x00000000004ce754 in ngx_mrb_run (r=r@entry=0xb2abf0, state=<optimized out>, code=0xbfda08, cached=0, 
    result=result@entry=0x0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:832
#32 0x00000000004ce7d4 in ngx_http_mruby_header_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2130
#33 0x00000000004d0e5f in ngx_http_mruby_header_filter (r=0xb2abf0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2179
#34 0x00000000004abc2a in ngx_http_not_modified_header_filter (r=<optimized out>)
    at src/http/modules/ngx_http_not_modified_filter_module.c:108
#35 0x0000000000484a00 in ngx_http_send_header (r=r@entry=0xb2abf0) at src/http/ngx_http_core_module.c:1955
#36 0x00000000004ce754 in ngx_mrb_run (r=r@entry=0xb2abf0, state=<optimized out>, code=0xbfda08, cached=0, 
    result=result@entry=0x0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:832
#37 0x00000000004ce7d4 in ngx_http_mruby_header_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2130
#38 0x00000000004d0e5f in ngx_http_mruby_header_filter (r=0xb2abf0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2179
#39 0x00000000004abc2a in ngx_http_not_modified_header_filter (r=<optimized out>)
    at src/http/modules/ngx_http_not_modified_filter_module.c:108
#40 0x0000000000484a00 in ngx_http_send_header (r=r@entry=0xb2abf0) at src/http/ngx_http_core_module.c:1955
#41 0x00000000004ce754 in ngx_mrb_run (r=r@entry=0xb2abf0, state=<optimized out>, code=0xbfda08, cached=0, 
    result=result@entry=0x0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:832
#42 0x00000000004ce7d4 in ngx_http_mruby_header_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2130
#43 0x00000000004d0e5f in ngx_http_mruby_header_filter (r=0xb2abf0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2179
#44 0x00000000004abc2a in ngx_http_not_modified_header_filter (r=<optimized out>)
    at src/http/modules/ngx_http_not_modified_filter_module.c:108
#45 0x0000000000484a00 in ngx_http_send_header (r=r@entry=0xb2abf0) at src/http/ngx_http_core_module.c:1955
#46 0x00000000004ce754 in ngx_mrb_run (r=r@entry=0xb2abf0, state=<optimized out>, code=0xbfda08, cached=0, 
    result=result@entry=0x0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:832
#47 0x00000000004ce7d4 in ngx_http_mruby_header_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2130
#48 0x00000000004d0e5f in ngx_http_mruby_header_filter (r=0xb2abf0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2179
#49 0x00000000004abc2a in ngx_http_not_modified_header_filter (r=<optimized out>)
    at src/http/modules/ngx_http_not_modified_filter_module.c:108
#50 0x0000000000484a00 in ngx_http_send_header (r=r@entry=0xb2abf0) at src/http/ngx_http_core_module.c:1955
#51 0x00000000004ce754 in ngx_mrb_run (r=r@entry=0xb2abf0, state=<optimized out>, code=0xbfda08, cached=0, 
    result=result@entry=0x0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:832
#52 0x00000000004ce7d4 in ngx_http_mruby_header_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2130
#53 0x00000000004d0e5f in ngx_http_mruby_header_filter (r=0xb2abf0)k

[snip]
@matsumotory
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@yyamano Thank you for your report. I'll check it later since I'm busy to write my doctoral thesis 😂

@yyamano
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yyamano commented Sep 1, 2016

I just found another infinite loop.

        location /foo/bar/ {
          mruby_output_body_filter_code '
            r = Nginx::Request.new
            f = Nginx::Filter.new
            body = (r.method == "POST" || r.method == "PUT") ? r.body.to_s : "no body"
            f.body = f.body + " for " + body
          ';
          return "200";
        }

% curl -X POST -d "foo" http://localhost:58080/foo/bar/

(gdb) run
Starting program: /home/vagrant/ngx_mruby/./build/nginx/sbin/nginx 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
"[7759] init master process"
2016/09/01 02:03:47 [notice] 7759#0: using the "epoll" event method
"ngx_mruby: STREAM: mruby_stream_init_code"
2016/09/01 02:03:47 [notice] 7759#0: nginx/1.10.1
2016/09/01 02:03:47 [notice] 7759#0: built by gcc 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC) 
2016/09/01 02:03:47 [notice] 7759#0: OS: Linux 3.10.0-327.13.1.el7.x86_64
2016/09/01 02:03:47 [notice] 7759#0: getrlimit(RLIMIT_NOFILE): 1024:4096
2016/09/01 02:03:47 [info] 7759#0: ngx_mruby INFO ngx_mrb_run_cycle:728: mrb_run
"[7759] init worker process from inline code"
"ngx_mruby: STREAM: mruby_stream_init_worker_code"
2016/09/01 02:03:51 [info] 7759#0: *1 ngx_mruby INFO ngx_mrb_run:829: mrb_run info: rputs_chain is null and return NGX_OK, client: 127.0.0.1, server: localhost, request: "POST /foo/bar/ HTTP/1.1", host: "localhost:58080"
2016/09/01 02:03:51 [error] 7759#0: *1 This phase doesn't have a request_body, client: 127.0.0.1, server: localhost, request: "POST /foo/bar/ HTTP/1.1", host: "localhost:58080"
2016/09/01 02:03:51 [error] 7759#0: *1 This phase doesn't have a request_body, client: 127.0.0.1, server: localhost, request: "POST /foo/bar/ HTTP/1.1", host: "localhost:58080"

[snip]

2016/09/01 02:03:51 [error] 7759#0: *1 This phase doesn't have a request_body, client: 127.0.0.1, server: localhost, request: "POST /foo/bar/ HTTP/1.1", host: "localhost:58080"
2016/09/01 02:03:51 [error] 7759#0: *1 This phase doesn't have a request_body, client: 127.0.0.1, server: localhost, request: "POST /foo/bar/ HTTP/1.1", host: "localhost:58080"
2016/09/01 02:03:51 [error] 7759#0: *1 This phase doesn't have a request_body, client: 127.0.0.1, server: localhost, request: "POST /foo/bar/ HTTP/1.1", host: "localhost:58080"
2016/09/01 02:03:51 [error] 7759#0: *1 This phase doesn't have a request_body, client: 127.0.0.1, server: localhost, request: "POST /foo/bar/ HTTP/1.1", host: "localhost:58080"

Program received signal SIGSEGV, Segmentation fault.
0x00000000004563c3 in ngx_log_error_core (level=level@entry=4, log=0xb1b5e0, err=err@entry=0, 
    fmt=fmt@entry=0x736b48 "This phase doesn't have a request_body") at src/core/ngx_log.c:117
117     p = ngx_cpymem(errstr, ngx_cached_err_log_time.data,
Missing separate debuginfos, use: debuginfo-install glibc-2.17-106.el7_2.6.x86_64 nss-softokn-freebl-3.16.2.3-13.el7_1.x86_64 openssl-libs-1.0.1e-51.el7_2.5.x86_64 pcre-8.32-15.el7_2.1.x86_64 zlib-1.2.7-15.el7.x86_64
(gdb) bt
#0  0x00000000004563c3 in ngx_log_error_core (level=level@entry=4, log=0xb1b5e0, err=err@entry=0, 
    fmt=fmt@entry=0x736b48 "This phase doesn't have a request_body") at src/core/ngx_log.c:117
#1  0x00000000004d3982 in read_request_body_cb (r=0xb2abf0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:128
#2  0x0000000000490359 in ngx_http_read_client_request_body (r=<optimized out>, 
    post_handler=post_handler@entry=0x4d392b <read_request_body_cb>) at src/http/ngx_http_request_body.c:45
#3  0x00000000004d3b7d in ngx_mrb_read_request_body (mrb=0xb34830, self=...)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:193
#4  0x00000000004fbe59 in mrb_vm_exec (mrb=mrb@entry=0xb34830, proc=<optimized out>, proc@entry=0xb82c20, 
    pc=0x7689d4 <gem_mrblib_irep_mruby_ngx_mruby_ext+600>) at /home/vagrant/ngx_mruby/mruby/src/vm.c:1150
#5  0x000000000050157e in mrb_vm_run (stack_keep=<optimized out>, self=..., proc=0xb82c20, mrb=0xb34830)
    at /home/vagrant/ngx_mruby/mruby/src/vm.c:759
#6  mrb_run (mrb=0xb34830, proc=0xb82c20, self=...) at /home/vagrant/ngx_mruby/mruby/src/vm.c:2424
#7  0x00000000004ce49a in ngx_mrb_run (r=r@entry=0xb2abf0, state=0xb25628, code=0xc539d8, cached=0, result=result@entry=0x0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:785
#8  0x00000000004ce900 in ngx_http_mruby_body_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2123
#9  0x00000000004d1184 in ngx_http_mruby_body_filter (r=0xb2abf0, in=0xe343f0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2283
#10 0x0000000000459663 in ngx_output_chain (ctx=ctx@entry=0xce10c0, in=in@entry=0x7fffff7ffca0)
    at src/core/ngx_output_chain.c:214
#11 0x00000000004ab872 in ngx_http_copy_filter (r=0xb2abf0, in=0x7fffff7ffca0) at src/http/ngx_http_copy_filter_module.c:152
#12 0x00000000004a3060 in ngx_http_range_body_filter (r=0xb2abf0, in=<optimized out>)
    at src/http/modules/ngx_http_range_filter_module.c:623
#13 0x0000000000484a10 in ngx_http_output_filter (r=r@entry=0xb2abf0, in=in@entry=0x7fffff7ffca0)
    at src/http/ngx_http_core_module.c:1970
#14 0x0000000000486a0d in ngx_http_send_special_response (r=r@entry=0xb2abf0, clcf=clcf@entry=0xc52468, err=<optimized out>)
    at src/http/ngx_http_special_response.c:715
#15 0x0000000000486de1 in ngx_http_special_response_handler (r=r@entry=0xb2abf0, error=error@entry=500)
    at src/http/ngx_http_special_response.c:471
#16 0x0000000000489471 in ngx_http_finalize_request (r=r@entry=0xb2abf0, rc=rc@entry=500) at src/http/ngx_http_request.c:2329
#17 0x00000000004d398f in read_request_body_cb (r=0xb2abf0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:129
#18 0x0000000000490359 in ngx_http_read_client_request_body (r=<optimized out>, 
    post_handler=post_handler@entry=0x4d392b <read_request_body_cb>) at src/http/ngx_http_request_body.c:45
#19 0x00000000004d3b7d in ngx_mrb_read_request_body (mrb=0xb34830, self=...)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:193
#20 0x00000000004fbe59 in mrb_vm_exec (mrb=mrb@entry=0xb34830, proc=<optimized out>, proc@entry=0xb82c20, 
    pc=0x7689d4 <gem_mrblib_irep_mruby_ngx_mruby_ext+600>) at /home/vagrant/ngx_mruby/mruby/src/vm.c:1150
#21 0x000000000050157e in mrb_vm_run (stack_keep=<optimized out>, self=..., proc=0xb82c20, mrb=0xb34830)
    at /home/vagrant/ngx_mruby/mruby/src/vm.c:759
#22 mrb_run (mrb=0xb34830, proc=0xb82c20, self=...) at /home/vagrant/ngx_mruby/mruby/src/vm.c:2424
#23 0x00000000004ce49a in ngx_mrb_run (r=r@entry=0xb2abf0, state=0xb25628, code=0xc539d8, cached=0, result=result@entry=0x0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:785
#24 0x00000000004ce900 in ngx_http_mruby_body_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2123
#25 0x00000000004d1184 in ngx_http_mruby_body_filter (r=0xb2abf0, in=0xe34300)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2283
#26 0x0000000000459663 in ngx_output_chain (ctx=ctx@entry=0xce10c0, in=in@entry=0x7fffff800500)
    at src/core/ngx_output_chain.c:214
#27 0x00000000004ab872 in ngx_http_copy_filter (r=0xb2abf0, in=0x7fffff800500) at src/http/ngx_http_copy_filter_module.c:152
#28 0x00000000004a3060 in ngx_http_range_body_filter (r=0xb2abf0, in=<optimized out>)
    at src/http/modules/ngx_http_range_filter_module.c:623
#29 0x0000000000484a10 in ngx_http_output_filter (r=r@entry=0xb2abf0, in=in@entry=0x7fffff800500)
    at src/http/ngx_http_core_module.c:1970
#30 0x0000000000486a0d in ngx_http_send_special_response (r=r@entry=0xb2abf0, clcf=clcf@entry=0xc52468, err=<optimized out>)
    at src/http/ngx_http_special_response.c:715
#31 0x0000000000486de1 in ngx_http_special_response_handler (r=r@entry=0xb2abf0, error=error@entry=500)
    at src/http/ngx_http_special_response.c:471
#32 0x0000000000489471 in ngx_http_finalize_request (r=r@entry=0xb2abf0, rc=rc@entry=500) at src/http/ngx_http_request.c:2329
#33 0x00000000004d398f in read_request_body_cb (r=0xb2abf0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:129
#34 0x0000000000490359 in ngx_http_read_client_request_body (r=<optimized out>, 
    post_handler=post_handler@entry=0x4d392b <read_request_body_cb>) at src/http/ngx_http_request_body.c:45
#35 0x00000000004d3b7d in ngx_mrb_read_request_body (mrb=0xb34830, self=...)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:193
#36 0x00000000004fbe59 in mrb_vm_exec (mrb=mrb@entry=0xb34830, proc=<optimized out>, proc@entry=0xb82c20, 
    pc=0x7689d4 <gem_mrblib_irep_mruby_ngx_mruby_ext+600>) at /home/vagrant/ngx_mruby/mruby/src/vm.c:1150
#37 0x000000000050157e in mrb_vm_run (stack_keep=<optimized out>, self=..., proc=0xb82c20, mrb=0xb34830)
    at /home/vagrant/ngx_mruby/mruby/src/vm.c:759
#38 mrb_run (mrb=0xb34830, proc=0xb82c20, self=...) at /home/vagrant/ngx_mruby/mruby/src/vm.c:2424
#39 0x00000000004ce49a in ngx_mrb_run (r=r@entry=0xb2abf0, state=0xb25628, code=0xc539d8, cached=0, result=result@entry=0x0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:785
#40 0x00000000004ce900 in ngx_http_mruby_body_filter_inline_handler (r=0xb2abf0, in=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2123
#41 0x00000000004d1184 in ngx_http_mruby_body_filter (r=0xb2abf0, in=0xe34210)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:2283
#42 0x0000000000459663 in ngx_output_chain (ctx=ctx@entry=0xce10c0, in=in@entry=0x7fffff800d60)
    at src/core/ngx_output_chain.c:214
#43 0x00000000004ab872 in ngx_http_copy_filter (r=0xb2abf0, in=0x7fffff800d60) at src/http/ngx_http_copy_filter_module.c:152
#44 0x00000000004a3060 in ngx_http_range_body_filter (r=0xb2abf0, in=<optimized out>)
    at src/http/modules/ngx_http_range_filter_module.c:623
#45 0x0000000000484a10 in ngx_http_output_filter (r=r@entry=0xb2abf0, in=in@entry=0x7fffff800d60)
    at src/http/ngx_http_core_module.c:1970
#46 0x0000000000486a0d in ngx_http_send_special_response (r=r@entry=0xb2abf0, clcf=clcf@entry=0xc52468, err=<optimized out>)
    at src/http/ngx_http_special_response.c:715
#47 0x0000000000486de1 in ngx_http_special_response_handler (r=r@entry=0xb2abf0, error=error@entry=500)
    at src/http/ngx_http_special_response.c:471
#48 0x0000000000489471 in ngx_http_finalize_request (r=r@entry=0xb2abf0, rc=rc@entry=500) at src/http/ngx_http_request.c:2329
#49 0x00000000004d398f in read_request_body_cb (r=0xb2abf0) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:129
#50 0x0000000000490359 in ngx_http_read_client_request_body (r=<optimized out>, 
    post_handler=post_handler@entry=0x4d392b <read_request_body_cb>) at src/http/ngx_http_request_body.c:45
#51 0x00000000004d3b7d in ngx_mrb_read_request_body (mrb=0xb34830, self=...)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_request.c:193
#52 0x00000000004fbe59 in mrb_vm_exec (mrb=mrb@entry=0xb34830, proc=<optimized out>, proc@entry=0xb82c20, 
    pc=0x7689d4 <gem_mrblib_irep_mruby_ngx_mruby_ext+600>) at /home/vagrant/ngx_mruby/mruby/src/vm.c:1150
#53 0x000000000050157e in mrb_vm_run (stack_keep=<optimized out>, self=..., proc=0xb82c20, mrb=0xb34830)
    at /home/vagrant/ngx_mruby/mruby/src/vm.c:759
#54 mrb_run (mrb=0xb34830, proc=0xb82c20, self=...) at /home/vagrant/ngx_mruby/mruby/src/vm.c:2424
#55 0x00000000004ce49a in ngx_mrb_run (r=r@entry=0xb2abf0, state=0xb25628, code=0xc539d8, cached=0, result=result@entry=0x0)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:785
#56 0x00000000004ce900 in ngx_http_mruby_body_filter_inline_handler (r=0xb2abf0, in=<optimized out>)

[snip]

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