Attaching strace to the running avahi-daemon (<PID> is process ID of
avahi-daemon)
sudo strace -s 65535 -p <PID> 2>&1 | tee log
and stopping CUPS with
sudo stop cups
shows that avahi-daemon still sends out (or at least tries) broadcast
packets with the print queues:
sendmsg(13, {msg_name(16)={sa_family=AF_INET, sin_port=htons(5353), sin_addr=ine
t_addr("224.0.0.251")}, msg_iov(1)=[{"\0\0\0\0\0\31\0\0\0\0\0\0\31Generic PostSc
ript @ till\4_ipp\4_tcp\5local\0\0\377\0\1%HP Photosmart Pro B8800 series @ till
\300&\0\377\0\1!HP Photosmart C8100 series @ till\10_printer\300+\0\377\0\1!HP P
hotosmart C8100 series @ till\5_ipps\300+\0\377\0\1!HP Photosmart C8100 series @
till\300&\0\377\0\1!HP Photosmart C5200 series @ till\300\211\0\377\0\1!HP Phot
osmart C5200 series @ till\300\272\0\377\0\1!HP Photosmart C5200 series @ till\3
00&\0\377\0\1\35EPSON Stylus COLOR 880 @ till\300\211\0\377\0\1\35EPSON Stylus C
OLOR 880 @ till\300\272\0\377\0\1\35EPSON Stylus COLOR 880 @ till\300&\0\377\0\1
\36HP_Color_LaserJet_2600n @ till\300\211\0\377\0\1\36HP_Color_LaserJet_2600n @
till\300\272\0\377\0\1\36HP_Color_LaserJet_2600n @ till\300&\0\377\0\1\rHP Fax @
till\300\211\0\377\0\1\rHP Fax @ till\300\272\0\377\0\1\rHP Fax @ till\300&\0\3
77\0\1'Hewlett-Packard HP LaserJet 3390 @ till\300\211\0\377\0\1'Hewlett-Packard
HP LaserJet 3390 @ till\300\272\0\377\0\1'Hewlett-Packard HP LaserJet 3390 @ ti
ll\300&\0\377\0\1'Hewlett-Packard HP LaserJet 1020 @ till\300\211\0\377\0\1'Hewl
ett-Packard HP LaserJet 1020 @ till\300\272\0\377\0\1'Hewlett-Packard HP LaserJe
t 1020 @ till\300&\0\377\0\0013Hewlett-Packard HP Color LaserJet CM3530 MFP @ ti
ll\300\211\0\377\0\0013Hewlett-Packard HP Color LaserJet CM3530 MFP @ till\300\2
72\0\377\0\1", 1029}], msg_controllen=28, {cmsg_len=28, cmsg_level=SOL_IP, cmsg_
type=, ...}, msg_flags=0}, 0) = 1029
Remote machines do not see any Avahi broadcast from the machine where
avahi-daemon is spinning on 100% CPU.
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https://bugs.launchpad.net/bugs/1059286
Title:
avahi-daemon takes 100% CPU right after boot
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