Comment 6 for bug 239391

I can reproduce this where Evolution email is being indexed. With debug logging enabled I see:

top - 10:00:57 up 2:41, 4 users, load average: 1.55, 1.30, 1.21
Tasks: 172 total, 1 running, 171 sleeping, 0 stopped, 0 zombie
Cpu0 : 3.3%us, 1.0%sy, 74.8%ni, 19.6%id, 0.0%wa, 0.0%hi, 1.3%si, 0.0%st
Cpu1 : 3.3%us, 0.7%sy, 22.6%ni, 73.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 2061880k total, 2033472k used, 28408k free, 364756k buffers
Swap: 4000176k total, 0k used, 4000176k free, 501588k cached

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
10127 tj 39 19 138m 12m 2668 S 99 0.6 146:20.61 trackerd
 9926 root 20 0 195m 59m 18m S 2 2.9 3:02.17 Xorg
10051 tj 20 0 223m 16m 3852 S 1 0.8 0:25.72 pulseaudio

With debug logging (Verbosity=3) enabled the 100% CPU usage is caused by:

Scanning summary file /home/tj/.evolution/mail/imap/tjworld.net@pella/folders/Subscribed Lists/subfolders/video4linux/summary for junk
summary.version = 13
summary.flags = 1
summary.nextuid = 1
summary.time = 0
summary.count = 5265
summary.Unread = 50
summary.deleted = 5173
summary.junk = 0
deleting email email://1172067579.27670.2@hephaestion/Subscribed Lists/video4linux;uid=9
deleting email email://1172067579.27670.2@hephaestion/Subscribed Lists/video4linux;uid=13
deleting email email://1172067579.27670.2@hephaestion/Subscribed Lists/video4linux;uid=28
deleting email email://1172067579.27670.2@hephaestion/Subscribed Lists/video4linux;uid=30
deleting email email://1172067579.27670.2@hephaestion/Subscribed Lists/video4linux;uid=48
deleting email email://1172067579.27670.2@hephaestion/Subscribed Lists/video4linux;uid=50
deleting email email://1172067579.27670.2@hephaestion/Subscribed Lists/video4linux;uid=54
deleting email email://1172067579.27670.2@hephaestion/Subscribed Lists/video4linux;uid=55
deleting email email://1172067579.27670.2@hephaestion/Subscribed Lists/video4linux;uid=56
deleting email email://1172067579.27670.2@hephaestion/Subscribed Lists/video4linux;uid=57

... and it goes on and on.