我在nginx.conf文件中将imap_client_buffer设置为64k（根据imap协议的要求） 但是当一个imap客户端发送一个非常长的命令，发布认证时，长度会被截断为4k（linux操作系统的默认页面大小）
我该如何调试此问题？我已经使用gdb逐步完成了代码。据我所知，在mail_proxy模块中，正确看到了conf文件的值（120000用于测试）
gdb) p p->upstream.connection->data
$24 = (void *) 0x9e4bd48
(gdb) p s
$25 = (ngx_mail_session_t *) 0x9e4bd48
(gdb) p p->buffer->end
Cannot access memory at address 0x1c
(gdb) p s->buffer->end - s->buffer->last
$26 = 120000
(gdb) p s
$27 = (ngx_mail_session_t *) 0x9e4bd48
(gdb) n
205 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
(gdb) n
207 s->proxy->buffer = ngx_create_temp_buf(s->connection->pool,
(gdb) p pcf
$28 = (ngx_mail_proxy_conf_t *) 0x9e3c480
(gdb) p *pcf
$29 = {enable = 1, pass_error_message = 1, xclient = 1, buffer_size = 120000,
timeout = 86400000, upstream_quick_retries = 0, upstream_retries = 0,
min_initial_retry_delay = 3000, max_initial_retry_delay = 3000,
max_retry_delay = 60000}
当使用telnet发送下面的命令时，只接受4k的数据，然后nginx挂起，直到我在键盘上按Enter键......之后截断的命令被发送到上游的imap服务器。
我使用的是nginx 0.78，这是一个已知的问题吗？
这是发送的命令
HP1L UID FETCH 344990,344996,344998,345004,345006,345010：345011,345015,345020,345043,345046,345049：345050,345053,345057：345059,345071,345080,345083,345085,345090,345092： 345093,345096,345101：345102,345106,345112,345117,345136,345140,345142：345144,345146：345147,345150,345161,345163,345167,345174：345176,345195,345197,345203,345205,345207：345209， 345214,345218,345221,345224,345229,345231,345233,345236,345239,345248,345264,345267,345272,345285,345290,345292,345301,345305,345308,345316,345320,345322,345324,345327,345358， 345375,345384,345386,345391,345409,345427：345428,345430：345432,345434：345435,345437,345439,345443,345448,345450,345463,345468：345470,345492,345494,345499,345501,345504,345506， 345515：345519,345522,345525,345535,345563,345568,345574,345577,345580,345582,345599,345622,345626,345630,345632：345633,345637,345640,345647：345648,345675,345684,345686：345687， 345703：345704,345714：345717,345720,345722：345724,345726,345730,345734：345737,345749,345756,345759,345783,345785：345787,345790,34 5806：345807,345812,345816,345720,345722：345724,345726,345730,345734：345737,345749,345756,345759,345783,345785：345787,345790,345806：345807,345812,345817,345902,345919,345953， 345978,345981,345984,345990,345997,346004,346008：346009,346011：346012,346022,346039,346044,346050,346061：346062,346066：346067,346075：346076,346081,346088,346090,346093,346096， 346098：346099,346110,346140,346170,346172：346174,346187,346189,346193：346194,346197,346204,346212,346225,346241,346244,346259,346323,346325：346328,346331：346332,346337：346338， 346342,346346,346353,346361：346362,346364,346420,346426,346432,346447,346450：346451,346453：346454,346456：346457,346459：346460,346466：346468,346474,346476,346479,346483,346496， 346498：346501,346504,346530,346539,346546,346576,346589：346590,346594：346595,346601,346607：346609,346612,346614：346615,346617：346618,346625,346631,346638,346641,346654,346657， 346661,346665,346671,346687：346688,346693,346695,346734：346735,346741,346747：346748,346755,346757,346777,346779,346786：346788,3 46791,346793,346801,346815,346821：346822,346825,346828,346837,346839,346843,346848,346857：346858,346860,346862：346863,346866,346868：346869,346877,346883,346895：346897,346899， 346923,346927,346945,346948,346961,346964：346966,346968,346970,346974,346987,346989：346990,346992,347000,347003,347008：347011,347013,347021,347028,347032：347034,347036,347049， 347051,347058,347076,347079,347081,347083,347085,347092,347096,347108,347130,347145：347148,347150,347155：347158,347161,347163：347164,347181,347184,347187：347189,347204,347210： 347211,347215,347217：347220,347227：347228,347234,347244,347246,347251,347253,347263：347264,347266,347268,347275,347292,347294,347304,347308,347317：347320,347322,347325：347327， 347340：347341,347346,347352：347353,347357,347360：347361,347375,347379,347382：347386,347389,347392,347402,347405：347406,347411,347433：347434,347438,347440：347441,347443：347444， 347448,347459：347460,347465,347468：347469,347476：347479,347490,347497,347506,347526,347530,347545,347547,347555：347556,347601： 347605,347632,347634,347641,347643：347646,347649,347653,347660,347668,347676,347707,347719,347722,347724,347727：347732,347735,347746,347754,347756：347757,347761,347776,347779， 347791,347798,347800,347805,347816：347817,347822,347837,347841,347843,347846,347848,347851,347879,347885,347892：347894,347903,347907：347911,347915：347916,347918,347950,347952： 347953,347981,347986：347988,348001,348037：348038,348049,348052,348056：348058,348061,348072,348074,348077：348078,348080,348082,348100,348105,348109,348111：348116,348119：348123， 348131：348132,348138,348150：348151,348153,348157,348161：348163,348166,348168：348169,348171,348173,348176,348178,348180：348181,348201,348204,348208,348218：348219,348222,348226， 348229：348230,348235,348238：348240,348244：348247,348249,348251：348253,348256：348257,348263,348285,348288：348289,348293,348298：348299,348301：348302,348305：348306,348310,348327， 348332：348337,348340,348342,348344,348348,348351：348353,348356：348357,348360,348366,348377,348386,348390,348398,348400：348401 ，348406：348407,348419,348422,348424,348427：348428,348430,348432：348433,348439,348444,348447：348448,348450：348451,348454,348456,348459：348460,348473,348493,348497：348498,348504 ，348506,348508,348516,348520,348527,348530,348532,348546：348547,348551,348560：348563,348567,348570：348572,348574,348577,348581,348588,348595,348610,348632,348636,348642,348646 ，348667,348672：348673,348679,348703,348713：348714,348716,348718：348722,348728：348729,348731,348735,348743：348745,348749,348751：348752,348759,348768,348773,348780：348781,348784 ：348791（UID FLAGS）