[Ignore the previous e-mail, I somehow sent it when I was trying to
paste from clipboard]
I recently migrated my dovecot/postfix setup to a new machine. After
doing so, I have encountered a problem where imap processes get stuck in
a loop eating loads of IO on the machine. Looking at the trace (snippet
below), it looks like they are sitting and reading the inbox and other
folders of certain users repeatedly. This seems to be triggered by the
delivery of a new e-mail to the user's mailbox while they have an IMAP
client connected, though I cannot say for sure.
This had never happened before on the old machine. I'm certain more
information would be useful, please let me know what I can provide to help!
Trace of process 22342 - imap
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203440140.P6242Q0M41485.scarecrow:2,RSc",
{st_mode=S_IFREG|0600, st_size=3079, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203446630.P7458Q0M562949.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=27769, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203454830.P9042Q0M402016.scarecrow:2,RSe",
{st_mode=S_IFREG|0600, st_size=730534, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203460967.P10096Q0M631472.scarecrow:2,S",
{st_mode=S_IFREG|0600, st_size=2690, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203463833.P10601Q0M946162.scarecrow:2,Sbc",
{st_mode=S_IFREG|0600, st_size=2319, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203468449.P11425Q0M422185.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=2650, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203469387.P11575Q0M276926.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=1317, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203472851.P12516Q0M604824.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=2491, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203474105.P12705Q0M450957.scarecrow:2,RS",
{st_mode=S_IFREG|0600, st_size=1489, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203474330.P12758Q0M302789.scarecrow:2,S",
{st_mode=S_IFREG|0600, st_size=1483, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203474352.P12765Q0M853382.scarecrow:2,RS",
{st_mode=S_IFREG|0600, st_size=1520, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203475497.P12947Q0M759098.scarecrow:2,RS",
{st_mode=S_IFREG|0600, st_size=1554, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203476420.P13131Q0M140164.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=1011, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203477055.P13350Q0M324248.scarecrow:2,S",
{st_mode=S_IFREG|0600, st_size=1511, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203485834.P14664Q0M678604.scarecrow:2,RSc",
{st_mode=S_IFREG|0600, st_size=2153, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203555290.P27989Q0M937789.scarecrow:2,S",
{st_mode=S_IFREG|0600, st_size=2017, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203566780.P29789Q0M486178.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=1570, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1216416810.P17960Q0M786183.tinman:2,S",
{st_mode=S_IFREG|0600, st_size=1447, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203567387.P29984Q0M463701.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=1560, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203568156.P30125Q0M174453.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=1570, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203568755.P30222Q0M271021.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=1555, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203578404.P31535Q0M370292.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=1125, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203581122.P31861Q0M954508.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=2108, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203596470.P3307Q0M326986.scarecrow:2,S",
{st_mode=S_IFREG|0600, st_size=2738, ...}) = 0
getdents64(12, /* 64 entries */, 4096) = 4096
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203615744.P6582Q0M282341.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=2027, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203619209.P7288Q0M583007.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=8739, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203629165.P9049Q0M921642.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=3049, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203638438.P10774Q0M313047.scarecrow:2,RS",
{st_mode=S_IFREG|0600, st_size=8889, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203639137.P10877Q0M554068.scarecrow:2,S",
{st_mode=S_IFREG|0600, st_size=9549, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203679395.P16427Q0M89616.scarecrow:2,Sc",
{st_mode=S_IFREG|0600, st_size=1364, ...}) = 0
lstat64("/home/vmail/u13.net/ryan/Maildir/cur/1203689732.P2011
