[Dovecot] Strange signal 11 crashes

[Ralf Hildebrandt]

These crashes only happen at night/during the evening, way after
maximum load:

Jan 27 21:19:57 postamt kernel: [1490698.849461] imap[15089]: segfault at 00000008 eip 080b779b esp bfbe20a0 error 4
Jan 27 21:20:50 postamt kernel: [1490752.022142] imap[15251]: segfault at 00000008 eip 080b779b esp bfd241e0 error 4
Jan 27 21:21:53 postamt kernel: [1490814.348208] imap[15482]: segfault at 00000008 eip 080b779b esp bfeca390 error 4
Jan 27 21:22:26 postamt kernel: [1490846.872861] imap[15710]: segfault at 00000008 eip 080b779b esp bfe262e0 error 4
Jan 27 21:22:58 postamt kernel: [1490879.492134] imap[15908]: segfault at 00000008 eip 080b779b esp bfc2e0f0 error 4
Jan 27 21:23:50 postamt kernel: [1490931.552328] imap[16074]: segfault at 00000008 eip 080b779b esp bfcef1b0 error 4
Jan 27 21:24:52 postamt kernel: [1490993.362124] imap[16523]: segfault at 00000008 eip 080b779b esp bfba8060 error 4
Jan 27 21:25:50 postamt kernel: [1491051.284134] imap[16701]: segfault at 00000008 eip 080b779b esp bf9f06b0 error 4
Jan 27 21:26:52 postamt kernel: [1491112.840002] imap[17045]: segfault at 00000008 eip 080b779b esp bfbe00a0 error 4
Jan 27 21:27:50 postamt kernel: [1491171.010657] imap[17195]: segfault at 00000008 eip 080b779b esp bf8c4580 error 4
Jan 27 21:28:23 postamt kernel: [1491203.375618] imap[17410]: segfault at 00000008 eip 080b779b esp bfbdf0a0 error 4
Jan 27 21:28:56 postamt kernel: [1491236.090416] imap[17634]: segfault at 00000008 eip 080b779b esp bfc188d0 error 4
Jan 27 21:29:52 postamt kernel: [1491292.432973] imap[17871]: segfault at 00000008 eip 080b779b esp bfc6f130 error 4
Jan 27 21:30:52 postamt kernel: [1491352.302931] imap[18136]: segfault at 00000008 eip 080b779b esp bfc83940 error 4
Jan 27 21:31:52 postamt kernel: [1491412.150117] imap[18392]: segfault at 00000008 eip 080b779b esp bfa50f10 error 4
Jan 27 21:32:52 postamt kernel: [1491472.070053] imap[18562]: segfault at 00000008 eip 080b779b esp bfe112d0 error 4
Jan 27 21:33:52 postamt kernel: [1491531.926641] imap[18821]: segfault at 00000008 eip 080b779b esp bfd189d0 error 4
Jan 27 21:34:52 postamt kernel: [1491591.760232] imap[19068]: segfault at 00000008 eip 080b779b esp bfb78030 error 4
Jan 27 21:35:52 postamt kernel: [1491651.654617] imap[19257]: segfault at 00000008 eip 080b779b esp bfebd380 error 4
Jan 27 21:36:52 postamt kernel: [1491711.489063] imap[19453]: segfault at 00000008 eip 080b779b esp bfb1bfe0 error 4
Jan 27 21:37:52 postamt kernel: [1491771.348741] imap[19679]: segfault at 00000008 eip 080b779b esp bfd91a50 error 4
Jan 27 21:38:52 postamt kernel: [1491831.200945] imap[19927]: segfault at 00000008 eip 080b779b esp bfffd4c0 error 4
Jan 27 21:39:50 postamt kernel: [1491889.366175] imap[20108]: segfault at 00000008 eip 080b779b esp bfffc4c0 error 4
Jan 27 21:40:52 postamt kernel: [1491950.954458] imap[20385]: segfault at 00000008 eip 080b779b esp bfc1b8e0 error 4
Jan 27 21:41:52 postamt kernel: [1492010.867336] imap[20590]: segfault at 00000008 eip 080b779b esp bfbc4880 error 4
Jan 27 21:42:52 postamt kernel: [1492070.656109] imap[20821]: segfault at 00000008 eip 080b779b esp bfb0efd0 error 4
Jan 27 21:43:52 postamt kernel: [1492130.371791] imap[21098]: segfault at 00000008 eip 080b779b esp bfce11a0 error 4
Jan 27 21:44:52 postamt kernel: [1492190.407380] imap[21368]: segfault at 00000008 eip 080b779b esp bfd319f0 error 4
Jan 27 21:45:52 postamt kernel: [1492250.060784] imap[21596]: segfault at 00000008 eip 080b779b esp bfaac770 error 4
Jan 27 21:46:52 postamt kernel: [1492310.001016] imap[21744]: segfault at 00000008 eip 080b779b esp bfbaf870 error 4
Jan 27 21:47:52 postamt kernel: [1492370.025871] imap[21943]: segfault at 00000008 eip 080b779b esp bfb3a7f0 error 4
Jan 27 21:48:52 postamt kernel: [1492429.710557] imap[22124]: segfault at 00000008 eip 080b779b esp bf938df0 error 4
Jan 27 21:49:52 postamt kernel: [1492489.767330] imap[22277]: segfault at 00000008 eip 080b779b esp bfeeebb0 error 4
Jan 27 21:50:52 postamt kernel: [1492549.596320] imap[22492]: segfault at 00000008 eip 080b779b esp bf980640 error 4
Jan 27 21:51:52 postamt kernel: [1492609.463280] imap[22661]: segfault at 00000008 eip 080b779b esp bfd65220 error 4
Jan 27 21:52:52 postamt kernel: [1492669.314384] imap[22835]: segfault at 00000008 eip 080b779b esp bfac1780 error 4
Jan 27 21:53:53 postamt kernel: [1492730.114634] imap[23043]: segfault at 00000008 eip 080b779b esp bfec5380 error 4
Jan 27 21:54:52 postamt kernel: [1492789.493685] imap[23251]: segfault at 00000008 eip 080b779b esp bfb72830 error 4
Jan 27 21:55:52 postamt kernel: [1492848.537290] imap[23463]: segfault at 00000008 eip 080b779b esp bfd101d0 error 4
Jan 27 21:56:52 postamt kernel: [1492908.394380] imap[23666]: segfault at 00000008 eip 080b779b esp bfd059c0 error 4
Jan 27 21:57:52 postamt kernel: [1492968.672480] imap[23905]: segfault at 00000008 eip 080b779b esp bfcef1b0 error 4
Jan 27 21:58:52 postamt kernel: [1493028.626160] imap[24075]: segfault at 00000008 eip 080b779b esp bff56410 error 4
Jan 27 21:59:52 postamt kernel: [1493088.262756] imap[24246]: segfault at 00000008 eip 080b779b esp bf863520 error 4
Jan 27 22:00:52 postamt kernel: [1493148.311438] imap[24521]: segfault at 00000008 eip 080b779b esp bf9c7680 error 4
Jan 27 22:01:52 postamt kernel: [1493208.190755] imap[24747]: segfault at 00000008 eip 080b779b esp bfcdc9a0 error 4
Jan 27 22:02:52 postamt kernel: [1493268.042169] imap[26155]: segfault at 00000008 eip 080b779b esp bf89ad60 error 4
Jan 27 22:03:52 postamt kernel: [1493327.789775] imap[26370]: segfault at 00000008 eip 080b779b esp bff8cc50 error 4
Jan 27 22:04:52 postamt kernel: [1493387.764633] imap[26684]: segfault at 00000008 eip 080b779b esp bf8eedb0 error 4
Jan 27 22:05:52 postamt kernel: [1493447.644743] imap[26977]: segfault at 00000008 eip 080b779b esp bfeecbb0 error 4
Jan 27 22:06:52 postamt kernel: [1493507.540180] imap[27125]: segfault at 00000008 eip 080b779b esp bf801cc0 error 4
Jan 27 22:07:52 postamt kernel: [1493567.369566] imap[27289]: segfault at 00000008 eip 080b779b esp bf8e85a0 error 4
Jan 27 22:08:52 postamt kernel: [1493627.231119] imap[27463]: segfault at 00000008 eip 080b779b esp bfb247e0 error 4
Jan 27 22:09:52 postamt kernel: [1493687.001615] imap[27738]: segfault at 00000008 eip 080b779b esp bf9d6e90 error 4
Jan 27 22:10:53 postamt kernel: [1493747.474619] imap[27959]: segfault at 00000008 eip 080b779b esp bfaca780 error 4
Jan 27 22:11:52 postamt kernel: [1493806.799749] imap[28128]: segfault at 00000008 eip 080b779b esp bfd44a00 error 4
Jan 27 22:12:52 postamt kernel: [1493866.861833] imap[28374]: segfault at 00000008 eip 080b779b esp bfe6eb30 error 4
Jan 27 22:13:52 postamt kernel: [1493926.548149] imap[28571]: segfault at 00000008 eip 080b779b esp bfe41300 error 4
Jan 27 22:14:52 postamt kernel: [1493986.130800] imap[28817]: segfault at 00000008 eip 080b779b esp bfa6b730 error 4
Jan 27 22:15:52 postamt kernel: [1494046.275731] imap[29091]: segfault at 00000008 eip 080b779b esp bfd1c9e0 error 4
Jan 27 22:16:52 postamt kernel: [1494105.988678] imap[29285]: segfault at 00000008 eip 080b779b esp bf857d10 error 4
Jan 27 22:17:52 postamt kernel: [1494166.024624] imap[29574]: segfault at 00000008 eip 080b779b esp bfc97150 error 4
Jan 27 22:18:52 postamt kernel: [1494225.876185] imap[29747]: segfault at 00000008 eip 080b779b esp bffd7c90 error 4
Jan 27 22:19:52 postamt kernel: [1494285.761548] imap[29926]: segfault at 00000008 eip 080b779b esp bf9c3e80 error 4
Jan 27 22:20:52 postamt kernel: [1494345.149565] imap[30237]: segfault at 00000008 eip 080b779b esp bfea5b60 error 4
Jan 27 22:21:50 postamt kernel: [1494403.787466] imap[30392]: segfault at 00000008 eip 080b779b esp bfa28ee0 error 4
Jan 27 22:22:52 postamt kernel: [1494465.489386] imap[30639]: segfault at 00000008 eip 080b779b esp bf9cbe90 error 4
Jan 27 22:23:25 postamt kernel: [1494497.752003] imap[30758]: segfault at 00000008 eip 080b779b esp bf816cd0 error 4
Jan 27 22:23:57 postamt kernel: [1494530.454853] imap[30841]: segfault at 00000008 eip 080b779b esp bfdfaac0 error 4
Jan 27 22:24:52 postamt kernel: [1494585.062982] imap[31006]: segfault at 00000008 eip 080b779b esp bfe06ac0 error 4
Jan 27 22:25:52 postamt kernel: [1494644.789199] imap[31255]: segfault at 00000008 eip 080b779b esp bf8dbda0 error 4
Jan 27 22:26:52 postamt kernel: [1494704.879185] imap[31416]: segfault at 00000008 eip 080b779b esp bf8004c0 error 4
Jan 27 22:27:52 postamt kernel: [1494764.685607] imap[31657]: segfault at 00000008 eip 080b779b esp bf862520 error 4
Jan 27 22:28:52 postamt kernel: [1494824.552415] imap[31846]: segfault at 00000008 eip 080b779b esp bfa386f0 error 4
Jan 27 22:29:52 postamt kernel: [1494884.436358] imap[32041]: segfault at 00000008 eip 080b779b esp bfb47000 error 4
Jan 27 22:30:52 postamt kernel: [1494944.287761] imap[32244]: segfault at 00000008 eip 080b779b esp bfa85f40 error 4
Jan 27 22:31:52 postamt kernel: [1495003.656530] imap[32548]: segfault at 00000008 eip 080b779b esp bf8134d0 error 4
Jan 27 22:32:52 postamt kernel: [1495064.053787] imap[330]: segfault at 00000008 eip 080b779b esp bfc89950 error 4
Jan 27 22:33:52 postamt kernel: [1495123.868411] imap[580]: segfault at 00000008 eip 080b779b esp bffe74a0 error 4
Jan 27 22:34:52 postamt kernel: [1495183.760209] imap[733]: segfault at 00000008 eip 080b779b esp bfca0160 error 4
Jan 27 22:35:53 postamt kernel: [1495244.552178] imap[996]: segfault at 00000008 eip 080b779b esp bfe1b2e0 error 4
Jan 27 22:36:52 postamt kernel: [1495303.487503] imap[1203]: segfault at 00000008 eip 080b779b esp bf996e50 error 4
Jan 27 22:37:52 postamt kernel: [1495363.343885] imap[1465]: segfault at 00000008 eip 080b779b esp bfd119d0 error 4
Jan 27 22:38:52 postamt kernel: [1495423.291009] imap[1681]: segfault at 00000008 eip 080b779b esp bfa52f10 error 4
Jan 27 22:39:52 postamt kernel: [1495483.048162] imap[1842]: segfault at 00000008 eip 080b779b esp bfc9dcc0 error 4
Jan 27 22:40:52 postamt kernel: [1495542.920011] imap[2005]: segfault at 00000008 eip 080b779b esp bfdeaab0 error 4
Jan 27 22:41:52 postamt kernel: [1495602.795677] imap[2191]: segfault at 00000008 eip 080b779b esp bfe5f320 error 4
Jan 27 22:42:52 postamt kernel: [1495662.663179] imap[2412]: segfault at 00000008 eip 080b779b esp bf8b4d70 error 4
Jan 27 22:43:52 postamt kernel: [1495722.027349] imap[2620]: segfault at 00000008 eip 080b779b esp bfd47200 error 4
Jan 27 22:44:52 postamt kernel: [1495782.234240] imap[2845]: segfault at 00000008 eip 080b779b esp bf8b0d70 error 4
Jan 27 22:45:52 postamt kernel: [1495842.253035] imap[3113]: segfault at 00000008 eip 080b779b esp bffb0c70 error 4
Jan 27 22:46:53 postamt kernel: [1495903.018329] imap[3370]: segfault at 00000008 eip 080b779b esp bfdf02b0 error 4
Jan 27 22:47:52 postamt kernel: [1495961.981124] imap[3587]: segfault at 00000008 eip 080b779b esp bfc090c0 error 4
Jan 27 22:48:52 postamt kernel: [1496021.846787] imap[3760]: segfault at 00000008 eip 080b779b esp bf80b4d0 error 4
Jan 27 22:49:52 postamt kernel: [1496081.560845] imap[3954]: segfault at 00000008 eip 080b779b esp bf8ba580 error 4
Jan 27 22:50:53 postamt kernel: [1496142.523771] imap[4125]: segfault at 00000008 eip 080b779b esp bfaf97b0 error 4
Jan 27 22:51:52 postamt kernel: [1496201.295812] imap[4313]: segfault at 00000008 eip 080b779b esp bf9345f0 error 4
Jan 27 22:52:52 postamt kernel: [1496260.799813] imap[4527]: segfault at 00000008 eip 080b779b esp bf922de0 error 4
Jan 27 22:53:52 postamt kernel: [1496320.720011] imap[4699]: segfault at 00000008 eip 080b779b esp bfa83740 error 4
Jan 27 22:54:52 postamt kernel: [1496380.573351] imap[4856]: segfault at 00000008 eip 080b779b esp bfaf3a50 error 4
Jan 27 22:55:52 postamt kernel: [1496440.439452] imap[5033]: segfault at 00000008 eip 080b779b esp bfd371f0 error 4
Jan 27 22:56:52 postamt kernel: [1496500.307642] imap[5241]: segfault at 00000008 eip 080b779b esp bfd391f0 error 4
Jan 27 22:57:52 postamt kernel: [1496560.149536] imap[5442]: segfault at 00000008 eip 080b779b esp bf981640 error 4
Jan 27 22:58:52 postamt kernel: [1496620.494374] imap[5616]: segfault at 00000008 eip 080b779b esp bfe182d0 error 4
Jan 27 22:59:52 postamt kernel: [1496680.203953] imap[5752]: segfault at 00000008 eip 080b779b esp bfe5c320 error 4
Jan 27 23:00:52 postamt kernel: [1496740.238370] imap[6015]: segfault at 00000008 eip 080b779b esp bfcc7180 error 4
Jan 27 23:01:52 postamt kernel: [1496800.103197] imap[6266]: segfault at 00000008 eip 080b779b esp bffaf470 error 4
Jan 27 23:02:52 postamt kernel: [1496859.985529] imap[7629]: segfault at 00000008 eip 080b779b esp bfe5db20 error 4
Jan 27 23:03:52 postamt kernel: [1496919.815999] imap[7845]: segfault at 00000008 eip 080b779b esp bfe4a300 error 4
Jan 27 23:04:52 postamt kernel: [1496979.640700] imap[8042]: segfault at 00000008 eip 080b779b esp bfcc8180 error 4
Jan 27 23:05:52 postamt kernel: [1497039.546839] imap[8299]: segfault at 00000008 eip 080b779b esp bfee3ba0 error 4
Jan 27 23:06:52 postamt kernel: [1497099.424993] imap[8541]: segfault at 00000008 eip 080b779b esp bfe6eb30 error 4
Jan 27 23:07:52 postamt kernel: [1497159.324847] imap[8713]: segfault at 00000008 eip 080b779b esp bfb97050 error 4
Jan 27 23:08:52 postamt kernel: [1497219.167949] imap[8887]: segfault at 00000008 eip 080b779b esp bfa7e740 error 4
Jan 27 23:09:52 postamt kernel: [1497278.561205] imap[9055]: segfault at 00000008 eip 080b779b esp bff53410 error 4
Jan 27 23:10:52 postamt kernel: [1497338.726155] imap[9326]: segfault at 00000008 eip 080b779b esp bfd85240 error 4
Jan 27 23:11:52 postamt kernel: [1497398.734613] imap[9525]: segfault at 00000008 eip 080b779b esp bfa9ff60 error 4
Jan 27 23:12:52 postamt kernel: [1497458.590435] imap[9733]: segfault at 00000008 eip 080b779b esp bf9cc690 error 4
Jan 27 23:13:54 postamt kernel: [1497519.795521] imap[9948]: segfault at 00000008 eip 080b779b esp bf8688a0 error 4
Jan 27 23:14:52 postamt kernel: [1497578.104239] imap[10104]: segfault at 00000008 eip 080b779b esp bf97fe40 error 4
Jan 27 23:15:52 postamt kernel: [1497637.980983] imap[10385]: segfault at 00000008 eip 080b779b esp bffac470 error 4
Jan 27 23:16:52 postamt kernel: [1497697.982077] imap[10612]: segfault at 00000008 eip 080b779b esp bfa6ff30 error 4
Jan 27 23:17:52 postamt kernel: [1497757.918665] imap[10869]: segfault at 00000008 eip 080b779b esp bf8054c0 error 4
Jan 27 23:18:52 postamt kernel: [1497817.727103] imap[11007]: segfault at 00000008 eip 080b779b esp bfe6d330 error 4
Jan 27 23:19:52 postamt kernel: [1497877.595778] imap[11173]: segfault at 00000008 eip 080b779b esp bf88bd50 error 4
Jan 27 23:20:52 postamt kernel: [1497937.308249] imap[11352]: segfault at 00000008 eip 080b779b esp bfb99050 error 4
Jan 27 23:21:52 postamt kernel: [1497997.328910] imap[11483]: segfault at 00000008 eip 080b779b esp bf903dc0 error 4
Jan 27 23:22:52 postamt kernel: [1498057.172791] imap[11698]: segfault at 00000008 eip 080b779b esp bfa6ff30 error 4
Jan 27 23:23:53 postamt kernel: [1498117.915910] imap[11878]: segfault at 00000008 eip 080b779b esp bfe3e300 error 4
Jan 27 23:24:52 postamt kernel: [1498176.698946] imap[12027]: segfault at 00000008 eip 080b779b esp bfd51210 error 4
Jan 27 23:25:52 postamt kernel: [1498236.751059] imap[12259]: segfault at 00000008 eip 080b779b esp bffb5ab0 error 4
Jan 27 23:26:52 postamt kernel: [1498296.659260] imap[12400]: segfault at 00000008 eip 080b779b esp bf81a4d0 error 4
Jan 27 23:27:52 postamt kernel: [1498356.554130] imap[12646]: segfault at 00000008 eip 080b779b esp bffe14a0 error 4
Jan 27 23:28:52 postamt kernel: [1498416.364134] imap[12781]: segfault at 00000008 eip 080b779b esp bfff4cb0 error 4
Jan 27 23:29:52 postamt kernel: [1498476.250874] imap[12919]: segfault at 00000008 eip 080b779b esp bff74430 error 4
Jan 27 23:30:52 postamt kernel: [1498536.066608] imap[13121]: segfault at 00000008 eip 080b779b esp bfa8cf50 error 4
Jan 27 23:31:52 postamt kernel: [1498595.882886] imap[13330]: segfault at 00000008 eip 080b779b esp bfe4bb10 error 4
Jan 27 23:32:52 postamt kernel: [1498655.847980] imap[13584]: segfault at 00000008 eip 080b779b esp bfb7f040 error 4
Jan 27 23:33:52 postamt kernel: [1498715.660556] imap[13772]: segfault at 00000008 eip 080b779b esp bfb49800 error 4
Jan 27 23:34:53 postamt kernel: [1498776.545256] imap[13951]: segfault at 00000008 eip 080b779b esp bfb91850 error 4
Jan 27 23:35:52 postamt kernel: [1498835.258066] imap[14134]: segfault at 00000008 eip 080b779b esp bfaebfb0 error 4
Jan 27 23:36:52 postamt kernel: [1498895.222671] imap[14302]: segfault at 00000008 eip 080b779b esp bfdc3280 error 4
Jan 27 23:37:52 postamt kernel: [1498954.618820] imap[14531]: segfault at 00000008 eip 080b779b esp bfcd2990 error 4
Jan 27 23:38:52 postamt kernel: [1499014.522614] imap[14664]: segfault at 00000008 eip 080b779b esp bfd249e0 error 4
Jan 27 23:39:52 postamt kernel: [1499074.837205] imap[14809]: segfault at 00000008 eip 080b779b esp bfbd5090 error 4
Jan 27 23:40:53 postamt kernel: [1499135.650847] imap[14994]: segfault at 00000008 eip 080b779b esp bfe17ad0 error 4
Jan 27 23:41:52 postamt kernel: [1499194.593713] imap[15169]: segfault at 00000008 eip 080b779b esp bfd0b1c0 error 4
Jan 27 23:42:52 postamt kernel: [1499253.963270] imap[15708]: segfault at 00000008 eip 080b779b esp bfc280e0 error 4
Jan 27 23:43:52 postamt kernel: [1499313.791662] imap[15877]: segfault at 00000008 eip 080b779b esp bfc2f0f0 error 4
Jan 27 23:44:52 postamt kernel: [1499373.647933] imap[16061]: segfault at 00000008 eip 080b779b esp bfc40900 error 4
Jan 27 23:45:52 postamt kernel: [1499433.995947] imap[16267]: segfault at 00000008 eip 080b779b esp bfda8260 error 4
Jan 27 23:46:52 postamt kernel: [1499493.713377] imap[16434]: segfault at 00000008 eip 080b779b esp bffcdc90 error 4
Jan 27 23:47:51 postamt kernel: [1499553.240307] imap[16637]: segfault at 00000008 eip 080b779b esp bfef6bb0 error 4
Jan 27 23:48:52 postamt kernel: [1499613.582920] imap[16753]: segfault at 00000008 eip 080b779b esp bff103d0 error 4
Jan 27 23:49:52 postamt kernel: [1499672.978342] imap[16905]: segfault at 00000008 eip 080b779b esp bfac1780 error 4
Jan 27 23:50:52 postamt kernel: [1499733.301011] imap[17073]: segfault at 00000008 eip 080b779b esp bfd259e0 error 4
Jan 27 23:51:52 postamt kernel: [1499793.182747] imap[17224]: segfault at 00000008 eip 080b779b esp bfd86240 error 4
Jan 27 23:52:52 postamt kernel: [1499853.043048] imap[17400]: segfault at 00000008 eip 080b779b esp bfeedbb0 error 4
Jan 27 23:53:52 postamt kernel: [1499912.906866] imap[17529]: segfault at 00000008 eip 080b779b esp bfc79130 error 4
Jan 27 23:54:52 postamt kernel: [1499972.757872] imap[17645]: segfault at 00000008 eip 080b779b esp bfe062c0 error 4
Jan 27 23:55:52 postamt kernel: [1500032.389678] imap[17917]: segfault at 00000008 eip 080b779b esp bfe20ae0 error 4
Jan 27 23:56:52 postamt kernel: [1500092.431048] imap[18205]: segfault at 00000008 eip 080b779b esp bfa3d700 error 4
Jan 27 23:57:52 postamt kernel: [1500152.322856] imap[18619]: segfault at 00000008 eip 080b779b esp bfb2c7f0 error 4
Jan 27 23:58:52 postamt kernel: [1500212.175835] imap[18833]: segfault at 00000008 eip 080b779b esp bfa01ec0 error 4
Jan 27 23:59:52 postamt kernel: [1500272.092326] imap[19007]: segfault at 00000008 eip 080b779b esp bff0abc0 error 4
Jan 28 00:00:52 postamt kernel: [1500331.907920] imap[20272]: segfault at 00000008 eip 080b779b esp bff50c10 error 4
Jan 28 00:01:52 postamt kernel: [1500391.720600] imap[20694]: segfault at 00000008 eip 080b779b esp bf827ce0 error 4
Jan 28 00:02:52 postamt kernel: [1500451.787824] imap[21892]: segfault at 00000008 eip 080b779b esp bf963e20 error 4
Jan 28 00:03:52 postamt kernel: [1500511.325729] imap[22072]: segfault at 00000008 eip 080b779b esp bfbf08b0 error 4
Jan 28 00:04:52 postamt kernel: [1500571.305433] imap[22503]: segfault at 00000008 eip 080b779b esp bfec6b80 error 4
Jan 28 00:05:52 postamt kernel: [1500631.151684] imap[22883]: segfault at 00000008 eip 080b779b esp bf9c7680 error 4
Jan 28 00:06:52 postamt kernel: [1500691.026298] imap[23089]: segfault at 00000008 eip 080b779b esp bfb0efd0 error 4
Jan 28 00:07:52 postamt kernel: [1500750.902355] imap[23358]: segfault at 00000008 eip 080b779b esp bfdde2a0 error 4
Jan 28 00:08:52 postamt kernel: [1500810.763196] imap[23513]: segfault at 00000008 eip 080b779b esp bfb7d840 error 4
Jan 28 00:09:52 postamt kernel: [1500870.615833] imap[23685]: segfault at 00000008 eip 080b779b esp bf802cc0 error 4
Jan 28 00:16:13 postamt kernel: [1501251.370985] imap[24769]: segfault at 00000008 eip 080b779b esp bff6e430 error 4
Jan 28 00:17:13 postamt kernel: [1501310.596696] imap[24946]: segfault at 00000008 eip 080b779b esp bf853510 error 4
Jan 28 00:18:13 postamt kernel: [1501370.920233] imap[25122]: segfault at 00000008 eip 080b779b esp bf967e20 error 4
Jan 28 00:19:13 postamt kernel: [1501430.766191] imap[25240]: segfault at 00000008 eip 080b779b esp bf9165d0 error 4
Jan 28 00:20:13 postamt kernel: [1501490.693524] imap[25427]: segfault at 00000008 eip 080b779b esp bfd90a50 error 4
Jan 28 00:21:13 postamt kernel: [1501550.168687] imap[25588]: segfault at 00000008 eip 080b779b esp bfad0790 error 4
Jan 28 00:22:13 postamt kernel: [1501609.977256] imap[25714]: segfault at 00000008 eip 080b779b esp bf936df0 error 4
Jan 28 00:23:13 postamt kernel: [1501670.119942] imap[25871]: segfault at 00000008 eip 080b779b esp bf942e00 error 4
Jan 28 00:24:13 postamt kernel: [1501729.991786] imap[26048]: segfault at 00000008 eip 080b779b esp bfcb9980 error 4
Jan 28 00:25:13 postamt kernel: [1501789.991210] imap[26269]: segfault at 00000008 eip 080b779b esp bfa266e0 error 4
Jan 28 00:26:13 postamt kernel: [1501849.853889] imap[26413]: segfault at 00000008 eip 080b779b esp bf9a6e60 error 4
Jan 28 00:27:13 postamt kernel: [1501909.701024] imap[26550]: segfault at 00000008 eip 080b779b esp bfac0f80 error 4
Jan 28 00:28:13 postamt kernel: [1501969.771280] imap[26762]: segfault at 00000008 eip 080b779b esp bff3ec00 error 4
Jan 28 00:29:13 postamt kernel: [1502029.435910] imap[26878]: segfault at 00000008 eip 080b779b esp bfc47100 error 4
Jan 28 00:30:13 postamt kernel: [1502089.306436] imap[27067]: segfault at 00000008 eip 080b779b esp bff2a3e0 error 4
Jan 28 00:31:13 postamt kernel: [1502149.155697] imap[27294]: segfault at 00000008 eip 080b779b esp bffbfc80 error 4
Jan 28 00:32:13 postamt kernel: [1502209.059814] imap[27463]: segfault at 00000008 eip 080b779b esp bfd309f0 error 4
Jan 28 00:33:13 postamt kernel: [1502268.888084] imap[27614]: segfault at 00000008 eip 080b779b esp bfb56810 error 4
Jan 28 00:34:13 postamt kernel: [1502328.741721] imap[27746]: segfault at 00000008 eip 080b779b esp bfba0060 error 4
Jan 28 00:35:13 postamt kernel: [1502388.156213] imap[27926]: segfault at 00000008 eip 080b779b esp bfaa0f60 error 4
Jan 28 00:36:13 postamt kernel: [1502448.062677] imap[28058]: segfault at 00000008 eip 080b779b esp bf827ce0 error 4
Jan 28 00:37:13 postamt kernel: [1502508.172595] imap[28254]: segfault at 00000008 eip 080b779b esp bff6f430 error 4
Jan 28 00:38:13 postamt kernel: [1502568.190818] imap[28390]: segfault at 00000008 eip 080b779b esp bfc64120 error 4
Jan 28 00:39:13 postamt kernel: [1502628.070471] imap[28541]: segfault at 00000008 eip 080b779b esp bfbca880 error 4
Jan 28 00:42:49 postamt kernel: [1502843.244085] imap[29043]: segfault at 00000008 eip 080b779b esp bfef83b0 error 4
Jan 28 00:43:24 postamt kernel: [1502877.724718] imap[29123]: segfault at 00000008 eip 080b779b esp bfc268e0 error 4
Jan 28 00:44:13 postamt kernel: [1502927.357346] imap[29234]: segfault at 00000008 eip 080b779b esp bfd44a00 error 4
Jan 28 00:45:13 postamt kernel: [1502987.018908] imap[29386]: segfault at 00000008 eip 080b779b esp bfd189d0 error 4
Jan 28 00:46:13 postamt kernel: [1503047.129405] imap[29535]: segfault at 00000008 eip 080b779b esp bfcdc9a0 error 4
Jan 28 00:47:13 postamt kernel: [1503106.951608] imap[29691]: segfault at 00000008 eip 080b779b esp bfdbe280 error 4
Jan 28 00:48:13 postamt kernel: [1503166.820452] imap[29820]: segfault at 00000008 eip 080b779b esp bf9d4690 error 4
Jan 28 00:49:13 postamt kernel: [1503226.508677] imap[29966]: segfault at 00000008 eip 080b779b esp bfd001c0 error 4
Jan 28 00:50:13 postamt kernel: [1503286.523513] imap[30118]: segfault at 00000008 eip 080b779b esp bf96fe30 error 4
Jan 28 00:51:13 postamt kernel: [1503346.423048] imap[30257]: segfault at 00000008 eip 080b779b esp bfad9790 error 4
Jan 28 00:52:13 postamt kernel: [1503405.755275] imap[30401]: segfault at 00000008 eip 080b779b esp bff103d0 error 4
Jan 28 00:53:13 postamt kernel: [1503466.131636] imap[30518]: segfault at 00000008 eip 080b779b esp bfe072c0 error 4
Jan 28 00:54:13 postamt kernel: [1503525.989899] imap[30660]: segfault at 00000008 eip 080b779b esp bfbdd0a0 error 4
Jan 28 00:55:13 postamt kernel: [1503585.752248] imap[30796]: segfault at 00000008 eip 080b779b esp bf964e20 error 4
Jan 28 00:56:13 postamt kernel: [1503645.222460] imap[30918]: segfault at 00000008 eip 080b779b esp bf9215e0 error 4
Jan 28 00:57:13 postamt kernel: [1503705.578693] imap[31036]: segfault at 00000008 eip 080b779b esp bf926de0 error 4
Jan 28 00:58:13 postamt kernel: [1503765.439651] imap[31140]: segfault at 00000008 eip 080b779b esp bfd6e230 error 4
Jan 28 00:59:13 postamt kernel: [1503825.315499] imap[31225]: segfault at 00000008 eip 080b779b esp bf81c4e0 error 4
Jan 28 01:00:13 postamt kernel: [1503885.246578] imap[31393]: segfault at 00000008 eip 080b779b esp bf898550 error 4
Jan 28 01:01:13 postamt kernel: [1503945.202943] imap[31556]: segfault at 00000008 eip 080b779b esp bfc178d0 error 4
Jan 28 01:02:13 postamt kernel: [1504004.816363] imap[32652]: segfault at 00000008 eip 080b779b esp bfd52210 error 4
Jan 28 01:03:13 postamt kernel: [1504064.842932] imap[624]: segfault at 00000008 eip 080b779b esp bff3ac00 error 4
Jan 28 01:04:13 postamt kernel: [1504124.319423] imap[794]: segfault at 00000008 eip 080b779b esp bfbdc0a0 error 4
Jan 28 01:05:13 postamt kernel: [1504184.493838] imap[954]: segfault at 00000008 eip 080b779b esp bfc8b950 error 4
Jan 28 01:06:13 postamt kernel: [1504244.266381] imap[1085]: segfault at 00000008 eip 080b779b esp bf80c4d0 error 4
Jan 28 01:07:13 postamt kernel: [1504304.213805] imap[1218]: segfault at 00000008 eip 080b779b esp bfc248e0 error 4
Jan 28 01:09:13 postamt kernel: [1504423.933524] imap[1517]: segfault at 00000008 eip 080b779b esp bf9df6a0 error 4
Jan 28 01:10:13 postamt kernel: [1504483.778455] imap[1678]: segfault at 00000008 eip 080b779b esp bfdd0290 error 4
Jan 28 01:11:13 postamt kernel: [1504543.914102] imap[1799]: segfault at 00000008 eip 080b779b esp bfa67f20 error 4
Jan 28 01:12:13 postamt kernel: [1504603.761115] imap[2111]: segfault at 00000008 eip 080b779b esp bf877d30 error 4
Jan 28 01:13:13 postamt kernel: [1504663.463429] imap[2214]: segfault at 00000008 eip 080b779b esp bfebcb80 error 4
Jan 28 01:14:13 postamt kernel: [1504723.291143] imap[2345]: segfault at 00000008 eip 080b779b esp bfad8f90 error 4
Jan 28 01:15:13 postamt kernel: [1504782.579991] imap[2590]: segfault at 00000008 eip 080b779b esp bfdba270 error 4
Jan 28 01:16:13 postamt kernel: [1504842.809325] imap[2719]: segfault at 00000008 eip 080b779b esp bff83c40 error 4
Jan 28 01:17:13 postamt kernel: [1504902.722683] imap[2872]: segfault at 00000008 eip 080b779b esp bfd089c0 error 4
Jan 28 01:18:13 postamt kernel: [1504962.676402] imap[2994]: segfault at 00000008 eip 080b779b esp bffb7c70 error 4
Jan 28 01:19:13 postamt kernel: [1505022.543614] imap[3130]: segfault at 00000008 eip 080b779b esp bfc328f0 error 4
Jan 28 01:20:13 postamt kernel: [1505081.936515] imap[3276]: segfault at 00000008 eip 080b779b esp bfb10f90 error 4
Jan 28 01:21:13 postamt kernel: [1505141.768812] imap[3451]: segfault at 00000008 eip 080b779b esp bff63420 error 4
Jan 28 01:23:13 postamt kernel: [1505261.818610] imap[3713]: segfault at 00000008 eip 080b779b esp bfee13a0 error 4
Jan 28 01:24:13 postamt kernel: [1505321.357798] imap[3829]: segfault at 00000008 eip 080b779b esp bf893550 error 4
Jan 28 01:25:13 postamt kernel: [1505381.550625] imap[3978]: segfault at 00000008 eip 080b779b esp bfe4d310 error 4
Jan 28 01:26:13 postamt kernel: [1505441.584355] imap[4098]: segfault at 00000008 eip 080b779b esp bff003c0 error 4
Jan 28 01:27:13 postamt kernel: [1505501.442841] imap[4268]: segfault at 00000008 eip 080b779b esp bfec0b80 error 4
Jan 28 01:28:13 postamt kernel: [1505561.257228] imap[4384]: segfault at 00000008 eip 080b779b esp bffb1c70 error 4
Jan 28 01:29:13 postamt kernel: [1505621.166565] imap[4492]: segfault at 00000008 eip 080b779b esp bfd1f9e0 error 4
Jan 28 01:30:13 postamt kernel: [1505680.877075] imap[4763]: segfault at 00000008 eip 080b779b esp bfa70f30 error 4
Jan 28 01:31:13 postamt kernel: [1505740.881620] imap[4855]: segfault at 00000008 eip 080b779b esp bfac6f80 error 4
Jan 28 01:32:13 postamt kernel: [1505800.750156] imap[4959]: segfault at 00000008 eip 080b779b esp bfa59710 error 4
Jan 28 01:33:13 postamt kernel: [1505860.605066] imap[5069]: segfault at 00000008 eip 080b779b esp bfdd5a90 error 4
Jan 28 01:34:13 postamt kernel: [1505920.474364] imap[5204]: segfault at 00000008 eip 080b779b esp bf977630 error 4
Jan 28 01:35:13 postamt kernel: [1505980.130676] imap[5333]: segfault at 00000008 eip 080b779b esp bfc62920 error 4
Jan 28 01:36:13 postamt kernel: [1506039.718655] imap[5557]: segfault at 00000008 eip 080b779b esp bf8d9590 error 4
Jan 28 01:37:13 postamt kernel: [1506100.034641] imap[5687]: segfault at 00000008 eip 080b779b esp bfe00ac0 error 4
Jan 28 01:38:13 postamt kernel: [1506159.943211] imap[5814]: segfault at 00000008 eip 080b779b esp bfb28fe0 error 4
Jan 28 01:39:13 postamt kernel: [1506219.783677] imap[5939]: segfault at 00000008 eip 080b779b esp bf865d20 error 4

Correlation with the dovecot log only shows:

Jan 28 01:39:13 postamt dovecot: child 5939 (imap) killed with signal 11
Jan 28 01:38:13 postamt dovecot: child 5814 (imap) killed with signal 11
... and so on ...

$ /usr/local/sbin/dovecot --version
1.0.10

-- 
Ralf Hildebrandt (Ralf.Hildebrandt at charite.de)             plonk at charite.de
Postfix - Einrichtung, Betrieb und Wartung       Tel. +49 (0)30-450 570-155
http://www.arschkrebs.de
UNIX is an operating system, OS/2 is half an operating system, Windows
is a shell, and DOS is a boot partition virus."  -- Peter H. Coffin