Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
On 10/20/09, Marco d'Itri m...@linux.it wrote:
On Oct 20, Torsten Crass torsten.cr...@ebiology.de wrote:
read(7, , 128)= 0
poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5,
3000) = 1 ([{fd=7, revents=POLLIN}])
So for some reason the signalfd(2) fd keeps returning nothing (which is
an error) with your self-compiled 2.6.22.20071006 kernel.
2.6.22 is supposed to work, so I will keep this bug open to see if
anybody else is affected.
I see that udevd, unlike the example in the man page, is quite
permissive in checking the results of the read.
Maybe if read(2) returns zero it should just fail.
size = read(pfd[FD_SIGNAL].fd, fdsi, sizeof(struct signalfd_siginfo));
if (size == sizeof(struct signalfd_siginfo))
handle_signal(udev, fdsi.ssi_signo);
Sounds good to me. A zero return from read should always mean EOF.
Whatever this means for a signalfd, it's not ignore this result and
try again. The manpage seems to exclude it anyway.
If none of the signals in mask is pending for the process, then
the read(2) either blocks until one of the signals in mask is
generated for the process, or fails with the error EAGAIN if the file
descriptor has been made non-blocking.
Alan
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Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
Package: udev Version: 146-5 Severity: normal I can confirm this also happens on the armel architecture, with the stock kernel (2.6.22.18), and started as Torsten mentioned above as part of a routine upgrade (in my case, on 21 Oct, having not done one for a few days). What differs is that even after killing all the 'udevd --daemon' processes, if I start up a single one, it is OK for a while, then relapses into the same behaviour. Also, the kernel log contained: Oct 21 20:28:23 sheeva kernel: udev: missing sysfs features; please update the kernel or disable the kernel's CONFIG_SYSFS_DEPRECATED option; udev may fail to work correctly Hope this helps # top 2949 root 21 -4 2448 952 496 R 98.3 0.2 1:06.70 udevd ... # ps ax | grep [u]devd | wc -l 63 # ps ax 2949 ?Rs2:50 udevd --daemon 2965 ?S 0:00 udevd --daemon ... # lsof -p 2949 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME udevd 2949 root cwdDIR 179,1 4096 2 / udevd 2949 root rtdDIR 179,1 4096 2 / udevd 2949 root txtREG 179,1 108752 16305 /sbin/udevd udevd 2949 root memREG 179,1 121688 196084 /lib/ld-2.9.so udevd 2949 root memREG 179,196164 196009 /lib/libselinux.so.1 udevd 2949 root memREG 179,1 1209920 196087 /lib/libc-2.9.so udevd 2949 root memREG 179,1 9808 196090 /lib/libdl-2.9.so udevd 2949 root memREG 179,126480 196094 /lib/libnss_compat-2.9.so udevd 2949 root memREG 179,175728 196093 /lib/libnsl-2.9.so udevd 2949 root memREG 179,138608 196098 /lib/libnss_nis-2.9.so udevd 2949 root memREG 179,142672 196096 /lib/libnss_files-2.9.so udevd 2949 root0u CHR1,3 0t0424 /dev/null udevd 2949 root1u CHR1,3 0t0424 /dev/null udevd 2949 root2u CHR1,3 0t0424 /dev/null udevd 2949 root3u REG 0,138 896307 /dev/.udev/queue.bin udevd 2949 root4u unix 0xc173fce0 0t0 895088 socket udevd 2949 root5u sock0,4 0t0 895089 can't identify protocol udevd 2949 root6r DIR0,90 1 inotify udevd 2949 root7u 0,60130 anon_inode udevd 2949 root8u unix 0xc173fb60 0t0 895090 socket udevd 2949 root9u unix 0xc173f560 0t0 895091 socket udevd 2949 root 12u unix 0xc173f860 0t0 895097 socket -- Package-specific info: -- /etc/udev/rules.d/: /etc/udev/rules.d/: total 0 -- /sys/: /sys/block/md0/dev /sys/block/mmcblk0/dev /sys/block/mmcblk0/mmcblk0p1/dev /sys/block/mtdblock0/dev /sys/block/mtdblock1/dev /sys/block/sda/dev /sys/block/sda/sda1/dev /sys/block/sda/sda2/dev /sys/class/input/mice/dev /sys/class/misc/btns/dev /sys/class/misc/cesa/dev /sys/class/misc/crypto/dev /sys/class/misc/device-mapper/dev /sys/class/misc/psaux/dev /sys/class/misc/rtc/dev /sys/class/mtd/mtd0/dev /sys/class/mtd/mtd0ro/dev /sys/class/mtd/mtd1/dev /sys/class/mtd/mtd1ro/dev /sys/class/scsi_generic/sg0/dev /sys/class/sound/audio/dev /sys/class/sound/controlC0/dev /sys/class/sound/dsp/dev /sys/class/sound/pcmC0D0c/dev /sys/class/sound/pcmC0D0p/dev /sys/class/sound/timer/dev /sys/class/usb_device/usbdev1.1/dev /sys/class/usb_device/usbdev1.12/dev /sys/class/usb_endpoint/usbdev1.12_ep00/dev /sys/class/usb_endpoint/usbdev1.12_ep02/dev /sys/class/usb_endpoint/usbdev1.12_ep81/dev /sys/class/usb_endpoint/usbdev1.1_ep00/dev /sys/class/usb_endpoint/usbdev1.1_ep81/dev /sys/devices/platform/ehci_marvell.70059/usb1/1-1/dev /sys/devices/platform/ehci_marvell.70059/usb1/dev -- Kernel configuration: isapnp_init not present. -- System Information: Debian Release: squeeze/sid APT prefers testing APT policy: (500, 'testing') Architecture: armel (armv5tejl) Kernel: Linux 2.6.22.18 Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages udev depends on: ii debconf [debconf-2.0]1.5.27 Debian configuration management sy ii libc62.9-25 GNU C Library: Shared libraries ii libselinux1 2.0.85-4SELinux runtime shared libraries ii libusb-0.1-4 2:0.1.12-13 userspace USB programming library ii lsb-base 3.2-23 Linux Standard Base 3.2 init scrip ii util-linux 2.16.1-4Miscellaneous system utilities Versions of packages udev recommends: ii pciutils 1:3.1.4-2 Linux PCI Utilities ii usbutils 0.86-2 Linux USB utilities udev suggests no packages. -- debconf information: udev/reboot_needed: udev/new_kernel_needed: false -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
On Oct 21, Peter Denison bug-repo...@marshadder.org wrote: What differs is that even after killing all the 'udevd --daemon' processes, if I start up a single one, it is OK for a while, then relapses into the same behaviour. It happens after udev receives an event. The best I can do it patch it to abort, you need to upgrade your kernel and possibly find out the first non-broken release. Oct 21 20:28:23 sheeva kernel: udev: missing sysfs features; please update the kernel or disable the kernel's CONFIG_SYSFS_DEPRECATED option; udev may fail to work correctly Unrelated, but you really need to disable that option. -- ciao, Marco signature.asc Description: Digital signature
Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
Package: udev Version: 146-5 Severity: important *** Please type your report below this line *** After a recent 'aptitude -r full-upgrade' (on October 18th, IIRC), udevd apparently begun utilising each CPU cycle it could get a hold on. Here's a typical output of 'top', demonstrating this behaviour: PID USER PR NI VIRT RES SHR S %CPU %MEMTIME+ COMMAND 961 root 21 -4 2356 888 420 S 91.2 0.2 186:43.57 udevd 3024 mythtv24 9 224m 20m 9516 S 3.8 4.7 6:37.21 mythbackend 5953 root 16 0 2448 1048 768 R 3.8 0.2 0:00.04 top 5952 root 10 -5 000 S 1.9 0.0 0:00.88 cx88[0] dvb 1 root 15 0 2020 664 572 S 0.0 0.1 0:01.10 init 2 root 10 -5 000 S 0.0 0.0 0:00.01 kthreadd 3 root 34 19 000 S 0.0 0.0 0:00.00 ksoftirqd/0 4 root 10 -5 000 S 0.0 0.0 0:00.19 events/0 5 root 10 -5 000 S 0.0 0.0 0:00.01 khelper 61 root 10 -5 000 S 0.0 0.0 0:00.01 kblockd/0 62 root 20 -5 000 S 0.0 0.0 0:00.00 kacpid 63 root 20 -5 000 S 0.0 0.0 0:00.00 acpi_notify 142 root 20 -5 000 S 0.0 0.0 0:00.00 ksuspend_usbd 145 root 10 -5 000 S 0.0 0.0 0:00.00 khubd 147 root 19 -5 000 S 0.0 0.0 0:00.00 kseriod 158 root 10 -5 000 S 0.0 0.0 0:00.00 khpsbpkt 163 root 10 -5 000 S 0.0 0.0 0:00.00 knodemgrd_0 Furthermore, numerous udevd processes are launched, as shown by 'ps -e | grep udevd | wc': 76 3042280 Another full-upgrade, which I performed some hours ago, didn't result in any improvements. Regards -- tcrass -- Package-specific info: -- /etc/udev/rules.d/: /etc/udev/rules.d/: total 24 -rw-r--r-- 1 root root 1137 Mar 11 2009 65_dmsetup.rules -rw-r--r-- 1 root root 695 Aug 26 2007 70-persistent-cd.rules -rw-r--r-- 1 root root 520 Oct 20 07:34 70-persistent-net.rules -rw-r--r-- 1 root root 520 Oct 20 07:33 70-persistent-net.rules~ -rw-r--r-- 1 root root 283 Apr 22 11:59 85_dmraid.rules lrwxrwxrwx 1 root root 15 Aug 26 2007 z60_hdparm.rules - ../hdparm.rules -rw-r--r-- 1 root root 1240 Apr 6 2009 z60_kpartx.rules lrwxrwxrwx 1 root root 17 Aug 26 2007 z60_usbmount.rules - ../usbmount.rules -- /sys/: /sys/block/hda/dev /sys/block/hda/hda1/dev /sys/block/hda/hda2/dev /sys/block/hda/hda3/dev /sys/block/hdc/dev /sys/block/loop0/dev /sys/block/loop1/dev /sys/block/loop2/dev /sys/block/loop3/dev /sys/block/loop4/dev /sys/block/loop5/dev /sys/block/loop6/dev /sys/block/loop7/dev /sys/class/drm/card0/dev /sys/class/dvb/dvb0.demux0/dev /sys/class/dvb/dvb0.dvr0/dev /sys/class/dvb/dvb0.frontend0/dev /sys/class/dvb/dvb0.net0/dev /sys/class/dvb/dvb1.demux0/dev /sys/class/dvb/dvb1.dvr0/dev /sys/class/dvb/dvb1.frontend0/dev /sys/class/dvb/dvb1.net0/dev /sys/class/ieee1394_protocol/raw1394/dev /sys/class/input/input0/event0/dev /sys/class/input/input1/event1/dev /sys/class/input/input2/event2/dev /sys/class/input/input3/event3/dev /sys/class/input/input4/event4/dev /sys/class/input/input5/event5/dev /sys/class/input/input5/mouse0/dev /sys/class/input/input6/event6/dev /sys/class/input/input7/event7/dev /sys/class/input/mice/dev /sys/class/lirc/lirc0/dev /sys/class/video4linux/vbi0/dev /sys/class/video4linux/vbi1/dev /sys/class/video4linux/video0/dev /sys/class/video4linux/video1/dev /sys/devices/pci:00/:00:10.0/usb2/2-0:1.0/usb_endpoint/usbdev2.1_ep81/dev /sys/devices/pci:00/:00:10.0/usb2/2-1/2-1:1.0/usb_endpoint/usbdev2.2_ep81/dev /sys/devices/pci:00/:00:10.0/usb2/2-1/2-1:1.1/usb_endpoint/usbdev2.2_ep82/dev /sys/devices/pci:00/:00:10.0/usb2/2-1/dev /sys/devices/pci:00/:00:10.0/usb2/2-1/usb_endpoint/usbdev2.2_ep00/dev /sys/devices/pci:00/:00:10.0/usb2/dev /sys/devices/pci:00/:00:10.0/usb2/usb_endpoint/usbdev2.1_ep00/dev /sys/devices/pci:00/:00:10.1/usb3/3-0:1.0/usb_endpoint/usbdev3.1_ep81/dev /sys/devices/pci:00/:00:10.1/usb3/dev /sys/devices/pci:00/:00:10.1/usb3/usb_endpoint/usbdev3.1_ep00/dev /sys/devices/pci:00/:00:10.2/usb4/4-0:1.0/usb_endpoint/usbdev4.1_ep81/dev /sys/devices/pci:00/:00:10.2/usb4/dev /sys/devices/pci:00/:00:10.2/usb4/usb_endpoint/usbdev4.1_ep00/dev /sys/devices/pci:00/:00:10.3/usb1/1-0:1.0/usb_endpoint/usbdev1.1_ep81/dev /sys/devices/pci:00/:00:10.3/usb1/dev /sys/devices/pci:00/:00:10.3/usb1/usb_endpoint/usbdev1.1_ep00/dev /sys/devices/pci:00/:00:11.5/sound/card0/adsp/dev /sys/devices/pci:00/:00:11.5/sound/card0/audio/dev /sys/devices/pci:00/:00:11.5/sound/card0/controlC0/dev /sys/devices/pci:00/:00:11.5/sound/card0/dsp/dev /sys/devices/pci:00/:00:11.5/sound/card0/mixer/dev /sys/devices/pci:00/:00:11.5/sound/card0/pcmC0D0c/dev
Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
On Oct 20, Torsten Crass torsten.cr...@ebiology.de wrote: After a recent 'aptitude -r full-upgrade' (on October 18th, IIRC), udevd apparently begun utilising each CPU cycle it could get a hold on. Here's a typical output of 'top', demonstrating this behaviour: udev just does what the kernel tells it to do. What about you find out what these processes are trying to do? If you do not know any better, at lease please report the complete output of ps axf. -- ciao, Marco signature.asc Description: Digital signature
Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
udev just does what the kernel tells it to do. What about you find out what these processes are trying to do? If you do not know any better, Sorry for not being an expert concerning the interaction between udev and the kernel. at lease please report the complete output of ps axf. Here it comes: PID TTY STAT TIME COMMAND 2 ?S 0:00 [kthreadd] 3 ?SN 0:00 \_ [ksoftirqd/0] 4 ?S 0:00 \_ [events/0] 5 ?S 0:00 \_ [khelper] 61 ?S 0:00 \_ [kblockd/0] 62 ?S 0:00 \_ [kacpid] 63 ?S 0:00 \_ [kacpi_notify] 142 ?S 0:00 \_ [ksuspend_usbd] 145 ?S 0:00 \_ [khubd] 147 ?S 0:00 \_ [kseriod] 158 ?S 0:00 \_ [khpsbpkt] 163 ?S 0:00 \_ [knodemgrd_0] 169 ?S 0:00 \_ [pdflush] 170 ?S 0:00 \_ [pdflush] 171 ?S 0:00 \_ [kswapd0] 172 ?S 0:00 \_ [aio/0] 844 ?S 0:00 \_ [kpsmoused] 856 ?S 0:00 \_ [kondemand/0] 878 ?S 0:01 \_ [kjournald] 1647 ?S 0:00 \_ [kjournald] 3036 ?S 0:11 \_ [kdvb-fe-0] 3040 ?S 0:16 \_ [kdvb-fe-1] 6981 ?S 0:01 \_ [cx88[1] dvb] 6984 ?S 0:00 \_ [cx88[0] dvb] 1 ?Ss 0:01 init [5] 961 ?Ss 274:38 udevd --daemon 973 ?S 0:00 \_ udevd --daemon 974 ?S 0:00 \_ udevd --daemon 975 ?S 0:00 \_ udevd --daemon 976 ?S 0:00 \_ udevd --daemon 977 ?S 0:00 \_ udevd --daemon 978 ?S 0:00 \_ udevd --daemon 979 ?S 0:00 \_ udevd --daemon 980 ?S 0:00 \_ udevd --daemon 988 ?S 0:00 \_ udevd --daemon 989 ?S 0:00 \_ udevd --daemon 990 ?S 0:00 \_ udevd --daemon 991 ?S 0:00 \_ udevd --daemon 992 ?S 0:00 \_ udevd --daemon 993 ?S 0:00 \_ udevd --daemon 994 ?S 0:00 \_ udevd --daemon 995 ?S 0:00 \_ udevd --daemon 996 ?S 0:00 \_ udevd --daemon 1002 ?S 0:00 \_ udevd --daemon 1003 ?S 0:00 \_ udevd --daemon 1004 ?S 0:00 \_ udevd --daemon 1005 ?S 0:00 \_ udevd --daemon 1006 ?S 0:00 \_ udevd --daemon 1007 ?S 0:00 \_ udevd --daemon 1008 ?S 0:00 \_ udevd --daemon 1009 ?S 0:00 \_ udevd --daemon 1027 ?S 0:00 \_ udevd --daemon 1028 ?S 0:00 \_ udevd --daemon 1029 ?S 0:00 \_ udevd --daemon 1030 ?S 0:00 \_ udevd --daemon 1031 ?S 0:00 \_ udevd --daemon 1032 ?S 0:00 \_ udevd --daemon 1033 ?S 0:00 \_ udevd --daemon 1034 ?S 0:00 \_ udevd --daemon 1043 ?S 0:00 \_ udevd --daemon 1044 ?S 0:00 \_ udevd --daemon 1045 ?S 0:00 \_ udevd --daemon 1046 ?S 0:00 \_ udevd --daemon 1047 ?S 0:00 \_ udevd --daemon 1048 ?S 0:00 \_ udevd --daemon 1049 ?S 0:00 \_ udevd --daemon 1050 ?S 0:00 \_ udevd --daemon 1051 ?S 0:00 \_ udevd --daemon 1059 ?S 0:00 \_ udevd --daemon 1060 ?S 0:00 \_ udevd --daemon 1061 ?S 0:00 \_ udevd --daemon 1062 ?S 0:00 \_ udevd --daemon 1063 ?S 0:00 \_ udevd --daemon 1064 ?S 0:00 \_ udevd --daemon 1065 ?S 0:00 \_ udevd --daemon 1066 ?S 0:00 \_ udevd --daemon 1091 ?S 0:00 \_ udevd --daemon 1092 ?S 0:00 \_ udevd --daemon 1093 ?S 0:00 \_ udevd --daemon 1094 ?S 0:00 \_ udevd --daemon 1095 ?S 0:00 \_ udevd --daemon 1096 ?S 0:00 \_ udevd --daemon 1097 ?S 0:00 \_ udevd --daemon 1098 ?S 0:00 \_ udevd --daemon 1099 ?S 0:00 \_ udevd --daemon 1108 ?S 0:00 \_ udevd --daemon 1109 ?S 0:00 \_ udevd --daemon 1110 ?S 0:00 \_ udevd --daemon ?S 0:00 \_ udevd --daemon 1112 ?S 0:00 \_ udevd --daemon 1113 ?S 0:00 \_ udevd --daemon 1114 ?S 0:00 \_ udevd --daemon 1115 ?S 0:00 \_ udevd --daemon 1118 ?S 0:00 \_ udevd --daemon 1119 ?S 0:00 \_ udevd --daemon 1120 ?S 0:00 \_ udevd --daemon 1121 ?S 0:00 \_ udevd --daemon 1122 ?S 0:00 \_ udevd --daemon 1123 ?S 0:00 \_ udevd --daemon 1124 ?S 0:00 \_ udevd --daemon 1125 ?S 0:00 \_ udevd --daemon 1821 ?Ss 0:00 /sbin/portmap 1909 ?Ss0:00 dhclient3 -pf /var/run/dhclient.eth0.pid -lf /var/lib/dhcp3/dhclient.eth0.leases eth0 2118 ?Ss 0:00 /sbin/syslogd 2127 ?
Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
On Oct 20, Torsten Crass torsten.cr...@ebiology.de wrote: Anyway, the high number of udevd processes is not my main concern; it's one of them causing an extremely high CPU load which puzzles me. I am not seeing one in your output. What is strace reporting? I am also interested in seeing if upgrading your kernel will solve this issue, 2.6.22 is just barely enough to make udev work. -- ciao, Marco signature.asc Description: Digital signature
Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
Anyway, the high number of udevd processes is not my main concern; it's
one of them causing an extremely high CPU load which puzzles me.
I am not seeing one in your output.
I thought the submitted 'top' output
PID USER PR NI VIRT RES SHR S %CPU %MEMTIME+ COMMAND
961 root 21 -4 2356 888 420 S 91.2 0.2 186:43.57 udevd
would suggest exactly that?
What is strace reporting?
'strace -p pid of udevd' yields a virtual endless enumeration of lines
like
read(7, , 128)= 0
poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, 3000)
= 1 ([{fd=7, revents=POLLIN}])
read(7, , 128)= 0
poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, 3000)
= 1 ([{fd=7, revents=POLLIN}])
read(7, , 128)= 0
poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, 3000)
= 1 ([{fd=7, revents=POLLIN}])
read(7, , 128)= 0
poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, 3000)
= 1 ([{fd=7, revents=POLLIN}])
read(7, , 128)= 0
poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, 3000)
= 1 ([{fd=7, revents=POLLIN}])
...
Hope this is the information you requested?
I am also interested in seeing if upgrading your kernel will solve this
issue, 2.6.22 is just barely enough to make udev work.
I see... wasn't aware of that. Pitty, since my 2.6.22 is a custom-built
kernel. If udev turns out to behave normal with a recent Debian kernel,
I guess I'll have to build a new one...
Regards --
tcrass
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Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
On Oct 20, Torsten Crass torsten.cr...@ebiology.de wrote:
read(7, , 128)= 0
poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, 3000)
= 1 ([{fd=7, revents=POLLIN}])
Now please report the output of lsof -p.
Is your libc up to date?
Do these processes exit after a few minutes or are they persistent?
What happens if you kill them and run udevd --daemon?
--
ciao,
Marco
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Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
Marco d'Itri wrote:
On Oct 20, Torsten Crass torsten.cr...@ebiology.de wrote:
read(7, , 128)= 0
poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, 3000)
= 1 ([{fd=7, revents=POLLIN}])
Now please report the output of lsof -p.
COMMAND PID USER FD TYPE DEVICE SIZE/OFFNODE NAME
udevd 961 root cwdDIR3,1 4096 2 /
udevd 961 root rtdDIR3,1 4096 2 /
udevd 961 root txtREG3,1 120972 517291 /sbin/udevd
udevd 961 root memREG3,142572 1115341
/lib/i686/cmov/libnss_files-2.10.1.so
udevd 961 root memREG3,179676 1115347
/lib/i686/cmov/libnsl-2.10.1.so
udevd 961 root memREG3,1 9736 1115318
/lib/i686/cmov/libdl-2.10.1.so
udevd 961 root memREG3,1 1315268 1115322
/lib/i686/cmov/libc-2.10.1.so
udevd 961 root memREG3,1 100172 615357
/lib/libselinux.so.1
udevd 961 root memREG3,138504 1115346
/lib/i686/cmov/libnss_nis-2.10.1.so
udevd 961 root memREG3,126400 1115356
/lib/i686/cmov/libnss_compat-2.10.1.so
udevd 961 root memREG3,1 113320 1034436 /lib/ld-2.10.1.so
udevd 961 root0u CHR1,3 0t01885 /dev/null
udevd 961 root1u CHR1,3 0t01885 /dev/null
udevd 961 root2u CHR1,3 0t01885 /dev/null
udevd 961 root3u REG 0,13 1108 11131
/dev/.udev/queue.bin
udevd 961 root4u unix 0xd9468de0 0t01891 socket
udevd 961 root5u sock0,4 0t01892 can't identify
protocol
udevd 961 root6r DIR0,90 1 inotify
udevd 961 root7u 0,60 322 anon_inode
udevd 961 root8u unix 0xd9468c60 0t01893 socket
udevd 961 root9u unix 0xd9468ae0 0t01894 socket
Is your libc up to date?
libc6-2.10.1-1
Do these processes exit after a few minutes or are they persistent?
'ps -e | grep udevd | sort ps1.txt ; sleep 600; ps -e | grep udevd |
sort ps2.txt ; diff ps1.txt ps2.txt ps.txt' yields
94c94
961 ?00:12:20 udevd
---
961 ?00:22:12 udevd
So all sixty or so udevd processes except one don't do anything, and
neither are any of them killed or new ones created.
What happens if you kill them and run udevd --daemon?
After 'killall -9 udevd' and manually launching udevd as daemon, only
one udevd process gets created, which seems to stay on its own even
after some thirty minutes.
BTW, I also installed the latest 2.6.30 Debian kernel, and running it
everything seems fine with regard to udev. If this stock kernel turns
out to meet my demands, I guess I'll stick with it. (As a first
prerequisite, the lirc modules could successfully be compiled against it.)
Regards --
tcrass
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Bug#551743: udevd spawns numerous processes and eats up almost all CPU time
On Oct 20, Torsten Crass torsten.cr...@ebiology.de wrote:
read(7, , 128)= 0
poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5,
3000) = 1 ([{fd=7, revents=POLLIN}])
So for some reason the signalfd(2) fd keeps returning nothing (which is
an error) with your self-compiled 2.6.22.20071006 kernel.
2.6.22 is supposed to work, so I will keep this bug open to see if
anybody else is affected.
I see that udevd, unlike the example in the man page, is quite
permissive in checking the results of the read.
Maybe if read(2) returns zero it should just fail.
size = read(pfd[FD_SIGNAL].fd, fdsi, sizeof(struct signalfd_siginfo));
if (size == sizeof(struct signalfd_siginfo))
handle_signal(udev, fdsi.ssi_signo);
--
ciao,
Marco
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