> Date: Wed, 9 May 2018 08:27:33 -0400 > From: Ben Carter <bhc@xxxxxxxx> > > > For starters: > > strace one of the processes & see if it's making any system calls at all. > > pstack a process multiple times to get PC samples. > > gcore a process to get a core dump & take a look at the core dump with gdb. > > If you know that a specific account is likely to have this issue, enable > IMAP protocol logging for the account. This may tell you something. > > Ben > > On 05/08/2018 02:04 PM, Andrew Nichols via Info-cyrus wrote: >> Hello, >> >> We've recently upgrade to cyrus 3.0.6 and we've been experiencing issue >> where imapd will get stuck in an Append and take 100% CPU time.? The >> client doesn't see anything weird.? I've tried leaving the processes to >> see if they resolve, but they never did.? Doing a kill -TERM twice will >> kill the process.?? I did not notice any issues with cyrus 3.0.5, but >> we've been trying to get Xapian indexing going, so we moved to 3.0.6. >> >> Does anyone have any information on where I can look to rectify this issue? >> >> >> Here's an example of the ps output: >> >> 87556 cyrus 1 102 0 163M 24192K CPU7 7 1:56 96.71% imapd: imap: <client >> hostname> [<clientip>] <username> user.<username>.<folder1> Append (imapd) >> 89680 cyrus 1 102 0 163M 24280K CPU4 4 3:10 96.22% imapd: imap: <client >> hostname> [<clientip>] <username> user.<username>.<folder2> Append (imapd) >> 43932 cyrus 1 102 0 161M 23416K CPU5 5 1:41 96.17% imapd: imap: <client >> hostname> [<clientip>] <username> user.<username>.<folder3> Append (imapd) >> 81590 cyrus 1 102 0 163M 24976K CPU6 6 3:14 94.76% imapd: imap: <client >> hostname> [<clientip>] <username> user.<username>.<folder4> Append (imapd) >> I was watching the processes with truss, and they weren’t making any system calls or creating any network traffic. The examples I gave were all from the same user, but we were having multiple users cause the same issue. I was able to get some core dumps using gcore and it looks to be an issue in the new EOF code in 3.0.6. I’d added a bug report on GitHub. Andrew Andrew Nichols Quadrant Newmedia support@xxxxxxxxxxxx 306.664.9100 ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
