Package: collectd Version: 4.6.3-1 Severity: normal In the default configuration, collectd's df plugin will collect statistics for all devices, including NFS mounts and other network filesystems.
If a laptop has collectd on it and is suspended via pm-suspend with some
NFS mounts, the following often happens:
- Network is taken down.
- collectd wakes up and calls statfs(2) on each mounted filesystem
- Hangs on the NFS mount, since the network is down.
- The kernel fails to suspend collectd, and the sleep fails.
- Accidentially still powered on laptop melts in its bag or causes
plane to crash into Hudson river. ;-)
When this happens, I see this in dmesg:
[12127.392595] runnable tasks:
[12127.392597] task PID tree-key switches prio
exec-runtime sum-exec sum-sleep
[12127.392600]
----------------------------------------------------------------------------------------------------------
[12127.392669] R pm-suspend 17121 1380454.770503 94 120
0 0 0.000000 0.000000
0.000000 /
[12127.392684]
[12127.392720] collectd
[12127.392814]
[12127.392817] Restarting tasks ... done.
Unmounting the network filesystems before suspend is probably wise,
but it's easy to forget to do that and sometimes you just want to suspend
with a network filesystem mounted, since remounting it on resume would
be hard (ie, might need a password for sshfs).
So this is, arguably, a bug in collectd. It would be much
nicer if its default config could avoid accessing network filesystems.
IMHO.
Less IMHO, if I configure collectd like this:
# Only list local devices, no network stuff.
<Plugin df>
Device "/dev/hda1"
IgnoreSelected false
</Plugin>
It still does this.
[pid 18790] statfs64("/", 84, {f_type="EXT2_SUPER_MAGIC", f_bsize=4096,
f_blocks=7404175, f_bfree=1494139, f_bavail=1494139, f_files=3768320,
f_ffree=3064836, f_fsid={-866525212, 419953648}, f_namelen=255, f_frsize=4096})
= 0
[pid 18794] read(7, "grep\0statfs\0", 4096) = 12
[pid 18790] statfs64("/lib/init/rw", 84, {f_type=0x1021994, f_bsize=4096,
f_blocks=128263, f_bfree=128263, f_bavail=128263, f_files=128263,
f_ffree=128258, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
[pid 18790] statfs64("/proc", 84, {f_type="PROC_SUPER_MAGIC", f_bsize=4096,
f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0},
f_namelen=255, f_frsize=4096}) = 0
[pid 18790] statfs64("/sys", 84, {f_type="SYSFS_MAGIC", f_bsize=4096,
f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0},
f_namelen=255, f_frsize=4096}) = 0
[pid 18790] statfs64("/dev", 84, {f_type=0x1021994, f_bsize=4096,
f_blocks=2560, f_bfree=2524, f_bavail=2524, f_files=128263, f_ffree=127038,
f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
[pid 18790] statfs64("/dev/shm", 84, {f_type=0x1021994, f_bsize=4096,
f_blocks=128263, f_bfree=128263, f_bavail=128263, f_files=128263,
f_ffree=128262, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
[pid 18790] statfs64("/dev/pts", 84, {f_type="DEVPTS_SUPER_MAGIC",
f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0,
f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
[pid 18790] statfs64("/sys/fs/fuse/connections", 84, {f_type=0x65735543,
f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0,
f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
[pid 18790] statfs64("/home/joey/mnt", 84, {f_type=0x65735546, f_bsize=0,
f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0},
f_namelen=0, f_frsize=0}) = 0
And that *is* a bug, I'm sure. dh.c runs this code much later than
seems to be necessary:
if (ignorelist_match (il_fstype, mnt_ptr->type))
continue;
if (ignorelist_match (il_mountpoint, mnt_ptr->dir))
continue;
I think that should definitly be moved to above the statfs call. And
then I *suggest* the default config be changed to something like:
<Plugin df>
FSType "nfs"
IgnoreSelected true
</Plugin>
-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.31-rc3-486
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages collectd depends on:
ii cdebconf [debconf-2.0] 0.146 Debian Configuration Management Sy
ii debconf [debconf-2.0] 1.5.27 Debian configuration management sy
ii libc6 2.9-25 GNU C Library: Shared libraries
ii librrd4 1.3.8-1 Time-series data storage and displ
Versions of packages collectd recommends:
ii iptables 1.4.4-2 administration tools for packet fi
ii libatk1.0-0 1.26.0-1 The ATK accessibility toolkit
ii libcairo2 1.8.8-2 The Cairo 2D vector graphics libra
ii libcurl3-gnutls 7.19.5-1 Multi-protocol file transfer libra
ii libdbi0 0.8.2-3 Database Independent Abstraction L
ii libdbus-1-3 1.2.16-2 simple interprocess messaging syst
ii libdbus-glib-1-2 0.82-1 simple interprocess messaging syst
ii libesmtp5 1.0.4-2 LibESMTP SMTP client library
ii libfontconfig1 2.6.0-4 generic font configuration library
ii libfreetype6 2.3.9-5 FreeType 2 font engine, shared lib
ii libglib2.0-0 2.20.4-1 The GLib library of C routines
ii libgtk2.0-0 2.16.5-1 The GTK+ graphical user interface
ii libhal1 0.5.13-3 Hardware Abstraction Layer - share
ii libmysqlclient15off 5.0.84-1 MySQL database client library
ii libnotify1 [libnotify1-gt 0.4.5-1 sends desktop notifications to a n
ii libopenipmi0 2.0.16-1 Intelligent Platform Management In
ii liboping0 1.3.2-1 C/C++ library to generate ICMP ECH
ii libpango1.0-0 1.24.5-1 Layout and rendering of internatio
ii libpcap0.8 1.0.0-2 system interface for user-level pa
ii libperl5.10 5.10.0-25 Shared Perl library
ii libpq5 8.4.0-2+b1 PostgreSQL C client library
ii libsensors3 1:2.10.8-1 library to read temperature/voltag
ii libsnmp15 5.4.1~dfsg-12 SNMP (Simple Network Management Pr
ii libssl0.9.8 0.9.8k-4 SSL shared libraries
ii libupsclient1 2.4.1-3 network UPS tools - client library
ii libvirt0 0.6.5-3 library for interfacing with diffe
ii libxml2 2.7.3.dfsg-2.1 GNOME XML library
ii lm-sensors 1:3.1.1-3 utilities to read temperature/volt
ii perl 5.10.0-25 Larry Wall's Practical Extraction
ii rrdtool 1.3.8-1 Time-series data storage and displ
Versions of packages collectd suggests:
ii apache2-mpm-worker [httpd-cg 2.2.12-1 Apache HTTP Server - high speed th
pn collectd-dev <none> (no description available)
pn hddtemp <none> (no description available)
ii libconfig-general-perl 2.42-1 Generic Configuration Module
ii libhtml-parser-perl 3.62-1 collection of modules that parse H
ii libregexp-common-perl 2.122-1 Provide commonly requested regular
ii librrds-perl 1.3.8-1 Time-series data storage and displ
ii liburi-perl 1.37+dfsg-1 Manipulates and accesses URI strin
pn mbmon <none> (no description available)
-- debconf information excluded
--
see shy jo
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