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• How do I unmount a tmpfs that is missing from /etc/mtab?

  - by vrinek

  I have the following line in /etc/fstab: none /home/hydra/tmp tmpfs user,noauto,size=1000M,uid=1001,gid=1001 0 0 I can do mount ~/tmp as user hydra and it gets mounted ok. The only problem is that even thought it gets added to /proc/mounts, it does not get added to /etc/mtab. When I try a umount ~/tmp (again as hydra) it complains: umount: /home/hydra/tmp is not mounted (according to mtab) And when I try -f or -n, it complains that I am not root. Some more info on the system that manifests this problem: On sudo umount /home/hydra/tmp, the fs gets unmounted (I think I needed to used -f too) Debian version is testing mount --version - mount from util-linux 2.19.1 (with libblkid and selinux support) ls -l /etc/mtab - -rw-r--r-- 1 root root 921 Nov 14 09:08 /etc/mtab cat /proc/mounts | grep rootfs - rootfs / rootfs rw 0 0 /home, /home/hydra nor /home/hydra/tmp are symbolic links

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• How can I access the external microphone with Ubuntu?

  - by Charles Merriam

  Sound in Ubuntu, it has its own special joy. I would like my external microphone to work. Symptoms: I can play sound through the speakers I can play sound through the headsets. Plugging and and plugging headphone output correctly switches. I can record from the built-in microphone, using "Sound Recorder" and others. but: I cannot record from the external microphone. My Sound Preferences/Input panel has no option for an external microphone. If the answer is upgrade the ALSA drivers, please say exactly what to type. Thank you. ======== I'm using Ubuntu 9.10 Karmic Koala on a laptop (Gateway W3501), Sigmatel. That is: ~$ head -1 /proc/asound/card0/code* ==> /proc/asound/card0/codec#0 <== Codec: SigmaTel STAC9205 ==> /proc/asound/card0/codec#1 <== Codec: Conexant ID 2c06 ~$ lspci | grep -i audio 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)

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• My control key doesn't work, how do I fix it??

  - by Blaine LaFreniere

  My control key on the right doesn't work how it should. E.g. Right ctrl + T won't open new tabs in firefox, right ctrl + w won't switch windows in vim, etc. I know the key isn't physically broken, because xev shows that the right ctrl key generates events, but it just isn't responding as I expect it to in applications. Screenshot: http://i46.tinypic.com/33w1h76.png I tried Kim's answer but it still doesn't work. blaine@blaine-laptop ~ $ xmodmap -pke | grep 105 keycode 105 = Control_R Control_R Control_R Control_R Control_R Tried to map as Control_L as well, didn't work. The computer is a laptop, I am unable to plug the keyboard in to another computer.

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• Recover data from a corrupted virtualbox vmdk file?

  - by Neth

  The power went out while I was doing a build on a VirtualBox machine, when I restarted the vmdk for the disk the vm was using was corrupted, apparently irrecoverably. I have been able to grep the 66GB vmdk file and it finds strings from the code I was working on that hadn't gotten in to subversion yet (yeah, yeah I know). But the strings are either in the shell history or what look to be strings inside object files. Any ideas for finding/recovering the source code? If it helps the vm was Linux, Fedora Core 10 on an ext3 filesystem. The host is an ubuntu 10.04_amd64 and has an ext4 filesystem.

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• Nxlog Multiline Input to 1 Syslog Message

  - by Eric

  I am using nxlog to tail a custom log file on one of my Windows servers. Each entry in the text file looks similar to this. =================================================================================================================== 1/14/2014 3:08:48 PM DOMAIN\user1 adding group member... Domain: blah Group: TestGroup Member: CN=Joe Bob,CN=Users,DC=blah,DC=ARG,DC=com 1/14/2014 3:08:48 PM 1 member added.<br> ================================================================================================ I'm trying to send this log to my syslog server and I want to combine these multiple lines to 1 line so I can easily grep/search for specific users or groups. I've read some of the documentation on nxlog's website regarding multiline but haven't found a specific config to put them all in 1 entry with a syslog header. Thanks, Eric

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• querying sge using job_name

  - by user39212

  Hello, qstat manual says -j [job_list] Prints either for all pending jobs or the jobs con- tained in job_list various information. The job_list can contain job_ids, job_names, or wildcard expression sge_types(1). i.e. qstat -j job_name should work. But whenver I try i get an error saying qstat -j test_20100203_01 ERROR: job-ID should be an integer Any idea if this should have worked. I can also use: qstat | grep test_20100203_01 but the problem is that qstat lists the shortened job name (something like test_2010020 and not test_20100203_01). Please advise.

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• Is there a smarter Find files utility for Windows 8 than Windows key + F?

  - by Clay Shannon

  Is there any utility for Windows 8 that will basically do the same thing the old "Find" dialog in Explorer did? Often times (many times a day) I need to find a particular file, and I don't know the name of it or where it is, but I can remember a phrase in it, and approximately when it was written, e.g., it has the phrase "Duckbilled Platypus" in it and was written sometime in the last week. The Find Files functionality in Windows 8 is lame by comparison; I know there are probably geeky ways to jump through hoops and do it, but I don't want to have to write GREP expressions, I want something easy like the old functionality...

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• OOM-Killer called every now and then..

  - by SpyrosP

  Hello there, i have a dedicated server where i've installed apache2, as well as Rails Passenger. Although i have 2GBs of RAM and most times about 1,5GB is free, there are some random times when i lose ssh and generic connectivity because oom-killer is killing processes. I suppose there is a memory leak but i cannot find out where it comes from. oom-killer kills apache2, mysql, passenger, whatever. Yesterday, i did a "cat syslog | grep -c oom-killer" and got 57 occurences ! It seems that something seriously destroys the memory. Once i reboot, everything comes back to normal. I suspect that it can be related to Passenger, but i'm still trying to figure it out. Can you think of anything else, or do you have anything to suggest that will make the leak identification procedure easier ? (i was even thinking of writing a bash script, to be run with cron for like every 5 minutes).

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• Utilize two gateways on the same network same interface with load balancing

  - by RushPL

  My setup is two ISPs on a single interface and single network. I can either set my default gateway to 192.168.0.1 or 192.168.1.250 and either work. My desire is to utilize both of them with some load balancing. I have tried to follow the advice given in here http://serverfault.com/a/96586 #!/bin/sh ip route show table main | grep -Ev '^default' \ | while read ROUTE ; do ip route add table ISP1 $ROUTE done ip route add default via 192.168.1.250 table ISP1 ip route add default via 192.168.0.1 table ISP2 iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark iptables -t mangle -A PREROUTING -m mark ! --mark 0 -j ACCEPT iptables -t mangle -A PREROUTING -j MARK --set-mark 10 iptables -t mangle -A PREROUTING -m statistic --mode random --probability 0.5 -j MARK --set-mark 20 iptables -t mangle -A PREROUTING -j CONNMARK --save-mark Now then I do "traceroute somehost" repeatedly I can only get route through my default route which is 192.168.1.250. Shouldn't the packets change routes in a random manner? How to debug it?

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• Can't create a file even if rights allow and I've relogged in

  - by stiv

  I try to create file in folder with group write access, user tomcat7 is in group. Why isn't it workin? skr@konrad~/data/asu$ sudo -u tomcat7 sh $ whoami tomcat7 $ echo > /home/skr/data/asu/g.gz.index sh: 2: cannot create /home/skr/data/asu/g.gz.index: Permission denied $ ls -la /home/skr/data/asu/ total 18708 drwxrwxr-x 2 skr skr 4096 Sep 29 08:38 . drwxrwxr-x 85 skr skr 4096 Jul 30 00:42 .. $ grep ^skr /etc/group skr:x:1002:tomcat7:mail Tried to logout, but it doesn't help. Any ideas?

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• OSSEC is not running

  - by batman

  I have an two ec2 instances. In one I have installed ossec server and in other I have installed ossec agent. Here are my server config INBOUND (security group/firewall) : port:514 source:0.0.0.0/0 port:1514 source:0.0.0.0/0 But it seems to be not working. In my agent log file I keep on getting: 2012/08/28 06:52:52 ossec-agentd: INFO: Using IPv4 for: x.x.x.x.x.x . 2012/08/28 06:53:13 ossec-agentd(4101): WARN: Waiting for server reply (not started). Tried: 'x.x.x.x.x'. Edit: Running sudo netstat --inet -nlp | grep ossec. I'm getting: udp 0 0 0.0.0.0:1514 0.0.0.0:* 26027/ossec-remoted Where I'm making the mistake?

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• How do I install php-gd?

  - by user42577

  I've done phpinfo() to see if it was installed but I see no mention of the gd libraries anywhere. I ran this command (rpm -qa | grep php) and this is what I see: php-gd-4.3.9-3.18.1.swsoft php-mysql-4.3.9-3.18.1.swsoft php-pgsql-4.3.9-3.18.1.swsoft php-4.3.9-3.18.1.swsoft php-domxml-4.3.9-3.18.1.swsoft php-imap-4.3.9-3.18.1.swsoft php-mbstring-4.3.9-3.18.1.swsoft php-ncurses-4.3.9-3.18.1.swsoft php-pear-4.3.9-3.18.1.swsoft php-snmp-4.3.9-3.18.1.swsoft php-devel-4.3.9-3.18.1.swsoft php-ldap-4.3.9-3.18.1.swsoft php-odbc-4.3.9-3.18.1.swsoft php-xmlrpc-4.3.9-3.18.1.swsoft My server is a linux box with php5 installed. I also tried to run yum install php5-gd to no avail.What else should I do or check to get it installed?

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• b43 module loaded, but no interface showed up

  - by Eduardo Bezerra

  I'm using CentOS 6.3 x86_64 on a hardware with a BCM43224 chip for wi-fi. I installed the b43-fwcutter module and then run modprobe b43, with no error messages. However, no new network interface showed up, and the return of iwconfig is: lo no wireless extensions. eth0 no wireless extensions. lspci -nn | grep 43224 returns: 03:00.0 Network controller [0280]: Broadcom Corporation BCM43224 802.11a/b/g/n [14e4:4353] (rev 01) and uname -a: Linux localhost.localdomain 2.6.32-279.14.1.el6.x86_64 #1 SMP Tue Nov 6 23:43:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Any ideas of how to make the wireless device work?

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• understanding mount -o bind

  - by Ionut

  Few questions after the following commands: mount -o bind /new_disk/home/user/ /home/user/ mount -o bind --no-mtab /new_disk/home/user/ /home/user/ What is the difference between the two commands other than " Mount without writing in /etc/mtab. This is necessary for example when /etc is on a read-only filesystem." What is the difference between mount -o bind and mount --bind ...if there are Let's suppose i don't know there is a partition mounted using -o bind --no-mtab...where can I find if there is any mound point with bind ? The only way i can detect this is grep user /proc/mounts but in that line there is no info abut bind. Thank you.

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• Open ports for Apache Tomcat-7.0.32 on Linux Mandriva

  - by ivanov-void

  I installed Apache Tomcat-7.0.32 on Linux Mandriva and I want to make it accessible. for this I need to open ports in iptables. I added the following rules- iptables -A INPUT -p tcp -m tcp --dport 8081 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8010 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8444 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8006 --syn -j ACCEPT then save and restart iptables - /etc/init.d/iptables save /etc/init.d/iptables restart verify, that ports is open - netstat -tulpn | less I am running command - netstat-ntpl | grep java and see - When I disable the firewall, I see the start page of the server on request - http://server_ip:8081/ When enable - server not accessible from outside. In what may be the cause? I would be most grateful for the information! Thank you!

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• Plesk 10 port 8443 connection timeout

  - by GriffinHeart

  I've installed plesk 10 on centOS and after installing to access the cp you need to go https::8443 I'm not being able to, and would like to find out why i can ssh to the server and i can, from the server telnet, to those ports. from another machine i can ping it but when i try to telnet or go to that address i get connection timeout, happens with port 80 and 8443 from my netstat netstat -nlp | grep 8443 tcp 0 0 :::8443 :::* LISTEN 25205/sw-cp-serverd How do i find out whats causing the problem? I also have a router but firewall is at the minimum and the server configured as DMZ, also tried to redirect 8443 to 8443 of the server.

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• Nohup & Sass: Process keeps running but, after a while, *.scss files do not get compiled

  - by maurits

  I am using Sass on a CentOS 5.8 server and want it to keep running after SSH logout, so that other users can edit *.scss files for days or even weeks to come without any need to start the program each time they login (in fact, they don't even have SSH access). I have used the following command from this question/answer: $ nohup sass --watch path/to/scss/files:path/to/css/output/files & Then, I log out of the SSH session and the process keeps running. It all works fine (logging in again and using touch to create a test file (test.scss) correctly triggers the creation of the corresponding test.css file) for the first few minutes, but after a while the *.scss files stop getting compiled... However, ps aux | grep 'sass' Shows that the process is still running. Anybody knows what am I doing wrong?

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• Various problems with software raid1 array built with Samsung 840 Pro SSDs

  - by Andy B

  I am bringing to ServerFault a problem that is tormenting me for 6+ months. I have a CentOS 6 (64bit) server with an md software raid-1 array with 2 x Samsung 840 Pro SSDs (512GB). Problems: Serious write speed problems: root [~]# time dd if=arch.tar.gz of=test4 bs=2M oflag=sync 146+1 records in 146+1 records out 307191761 bytes (307 MB) copied, 23.6788 s, 13.0 MB/s real 0m23.680s user 0m0.000s sys 0m0.932s When doing the above (or any other larger copy) the load spikes to unbelievable values (even over 100) going up from ~ 1. When doing the above I've also noticed very weird iostat results: Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 1589.50 0.00 54.00 0.00 13148.00 243.48 0.60 11.17 0.46 2.50 sdb 0.00 1627.50 0.00 16.50 0.00 9524.00 577.21 144.25 1439.33 60.61 100.00 md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 md2 0.00 0.00 0.00 1602.00 0.00 12816.00 8.00 0.00 0.00 0.00 0.00 md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 And it keeps it this way until it actually writes the file to the device (out from swap/cache/memory). The problem is that the second SSD in the array has svctm and await roughly 100 times larger than the second. For some reason the wear is different between the 2 members of the array root [~]# smartctl --attributes /dev/sda | grep -i wear 177 Wear_Leveling_Count 0x0013 094% 094 000 Pre-fail Always - 180 root [~]# smartctl --attributes /dev/sdb | grep -i wear 177 Wear_Leveling_Count 0x0013 070% 070 000 Pre-fail Always - 1005 The first SSD has a wear of 6% while the second SSD has a wear of 30%!! It's like the second SSD in the array works at least 5 times as hard as the first one as proven by the first iteration of iostat (the averages since reboot): Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 10.44 51.06 790.39 125.41 8803.98 1633.11 11.40 0.33 0.37 0.06 5.64 sdb 9.53 58.35 322.37 118.11 4835.59 1633.11 14.69 0.33 0.76 0.29 12.97 md1 0.00 0.00 1.88 1.33 15.07 10.68 8.00 0.00 0.00 0.00 0.00 md2 0.00 0.00 1109.02 173.12 10881.59 1620.39 9.75 0.00 0.00 0.00 0.00 md0 0.00 0.00 0.41 0.01 3.10 0.02 7.42 0.00 0.00 0.00 0.00 What I've tried: I've updated the firmware to DXM05B0Q (following reports of dramatic improvements for 840Ps after this update). I have looked for "hard resetting link" in dmesg to check for cable/backplane issues but nothing. I have checked the alignment and I believe they are aligned correctly (1MB boundary, listing below) I have checked /proc/mdstat and the array is Optimal (second listing below). root [~]# fdisk -ul /dev/sda Disk /dev/sda: 512.1 GB, 512110190592 bytes 255 heads, 63 sectors/track, 62260 cylinders, total 1000215216 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00026d59 Device Boot Start End Blocks Id System /dev/sda1 2048 4196351 2097152 fd Linux raid autodetect Partition 1 does not end on cylinder boundary. /dev/sda2 * 4196352 4605951 204800 fd Linux raid autodetect Partition 2 does not end on cylinder boundary. /dev/sda3 4605952 814106623 404750336 fd Linux raid autodetect root [~]# fdisk -ul /dev/sdb Disk /dev/sdb: 512.1 GB, 512110190592 bytes 255 heads, 63 sectors/track, 62260 cylinders, total 1000215216 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0003dede Device Boot Start End Blocks Id System /dev/sdb1 2048 4196351 2097152 fd Linux raid autodetect Partition 1 does not end on cylinder boundary. /dev/sdb2 * 4196352 4605951 204800 fd Linux raid autodetect Partition 2 does not end on cylinder boundary. /dev/sdb3 4605952 814106623 404750336 fd Linux raid autodetect /proc/mdstat root # cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb2[1] sda2[0] 204736 blocks super 1.0 [2/2] [UU] md2 : active raid1 sdb3[1] sda3[0] 404750144 blocks super 1.0 [2/2] [UU] md1 : active raid1 sdb1[1] sda1[0] 2096064 blocks super 1.1 [2/2] [UU] unused devices: Running a read test with hdparm root [~]# hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 664 MB in 3.00 seconds = 221.33 MB/sec root [~]# hdparm -t /dev/sdb /dev/sdb: Timing buffered disk reads: 288 MB in 3.01 seconds = 95.77 MB/sec But look what happens if I add --direct root [~]# hdparm --direct -t /dev/sda /dev/sda: Timing O_DIRECT disk reads: 788 MB in 3.01 seconds = 262.08 MB/sec root [~]# hdparm --direct -t /dev/sdb /dev/sdb: Timing O_DIRECT disk reads: 534 MB in 3.02 seconds = 176.90 MB/sec Both tests increase but /dev/sdb doubles while /dev/sda increases maybe 20%. I just don't know what to make of this. As suggested by Mr. Wagner I've done another read test with dd this time and it confirms the hdparm test: root [/home2]# dd if=/dev/sda of=/dev/null bs=1G count=10 10+0 records in 10+0 records out 10737418240 bytes (11 GB) copied, 38.0855 s, 282 MB/s root [/home2]# dd if=/dev/sdb of=/dev/null bs=1G count=10 10+0 records in 10+0 records out 10737418240 bytes (11 GB) copied, 115.24 s, 93.2 MB/s So sda is 3 times faster than sdb. Or maybe sdb is doing also something else besides what sda does. Is there some way to find out if sdb is doing more than what sda does? UPDATE Again, as suggested by Mr. Wagner, I have swapped the 2 SSDs. And as he thought it would happen, the problem moved from sdb to sda. So I guess I'll RMA one of the SSDs. I wonder if the cage might be problematic. What is wrong with this array? Please help!

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• Plesk 10 port 8443 connection timeout

  - by GriffinHeart

  I've installed plesk 10 on centOS and after installing to access the cp you need to go https::8443 I'm not being able to, and would like to find out why i can ssh to the server and i can, from the server telnet, to those ports. from another machine i can ping it but when i try to telnet or go to that address i get connection timeout, happens with port 80 and 8443 from my netstat netstat -nlp | grep 8443 tcp 0 0 :::8443 :::* LISTEN 25205/sw-cp-serverd How do i find out whats causing the problem? I also have a router but firewall is at the minimum and the server configured as DMZ, also tried to redirect 8443 to 8443 of the server.

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• Thoughts on Apache log file sizes?

  - by Nathan Long

  Do you place any limits on the size of Apache log files - access.log and error.log? Specifically, can you give: Reasons to limit log file sizes Disk space Any other? Reasons NOT to limit log file sizes Research into performance issues or security breaches Any other? Methods of doing so Cron job that periodically deletes the file, or the first N lines? Any other? Anything you might salvage before deleting For example, grep out how many times a file was downloaded before deleting the access logs I'd like get the thoughts of experienced sysadmins before I do anything. (Marking as community wiki since this may be a matter of opinion.)

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• What useful things can one add to one's .bashrc?

  - by gyaresu

  Is there anything that you can't live without and will make my life SO much easier? Here are some that I use ('diskspace' & 'folders' are particularly handy). # some more ls aliases alias ll='ls -alh' alias la='ls -A' alias l='ls -CFlh' alias woo='fortune' alias lsd="ls -alF | grep /$" # This is GOLD for finding out what is taking so much space on your drives! alias diskspace="du -S | sort -n -r |more" # Command line mplayer movie watching for the win. alias mp="mplayer -fs" # Show me the size (sorted) of only the folders in this directory alias folders="find . -maxdepth 1 -type d -print | xargs du -sk | sort -rn" # This will keep you sane when you're about to smash the keyboard again. alias frak="fortune" # This is where you put your hand rolled scripts (remember to chmod them) PATH="$HOME/bin:$PATH"

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• Setting the date format in Atlassian Crucible

  - by pwan

  When I set up a review in Atlassian Crucible, and I set a date, it displays it in DD/MM/YYYY I'd like to switch that over to MM/DD/YYYY, but I don't see anywhere in the configuration to switch that. The closest setting I see is for the timezone, which I have set to EST. I have Crucible running on a CentOS 6.2 machine that's set to UTC I'm using Crucible version 2.7.14 Build:20120612060728 2012-06-12 My locale is currently set to en_US.UTF-8 > locale | grep LC_TIME LC_TIME="en_US.UTF-8" Can someone point out how I can switch the date format in Crucible ?

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• Xen HVM guest has severe clock drift

  - by ipartola

  I am seeing a very severe clock drift on my Xen HVM VPS, rented from a hosting provider, so I don't have access to the dom0 system. I continuously run ntpd, but the clock drifts by as much as 30 seconds in 5 minutes and NTP cannot keep up. Has anyone experienced this? Here are some details: $ dmesg | grep clock [ 0.160000] Measured 347 cycles TSC warp between CPUs, turning off TSC clock. [ 0.396000] * this clock source is slow. Consider trying other clock sources [ 0.550448] Switching to clocksource acpi_pm [ 0.653135] rtc_cmos 00:05: setting system clock to 2011-03-09 02:45:40 UTC (1299638740) $ cat /sys/devices/system/clocksource/clocksource0/available_clocksource acpi_pm $ cat /sys/devices/system/clocksource/clocksource0/current_clocksource acpi_pm

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• if there are multiple kernel module can drive the same device, what is the rule to choose from them?

  - by Dyno Fu

  both pcnet32 and vmxnet can drive the device. $ lspci -k ... 02:01.0 Ethernet controller: Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE] (rev 10) Subsystem: Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE] Flags: bus master, medium devsel, latency 64, IRQ 19 I/O ports at 2000 [size=128] [virtual] Expansion ROM at dc400000 [disabled] [size=64K] Kernel driver in use: vmxnet Kernel modules: vmxnet, pcnet32 both kernel modules are loaded, $ lsmod | grep net pcnet32 32644 0 vmxnet 17696 0 mii 5212 1 pcnet32 as you see, kernel driver in use is vmxnet. is there any policy/algorithm in kernel how to choose from the candidates?

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• Linux says a kernel module has an unknown symbol, but another loaded module provides it.

  - by raldi

  I'm trying to install a driver for a USB DAQ box, which annoyingly, I have to compile myself. I believe I've succeeded -- I have two .ko files: -rw-r--r-- 1 root root 45271 2010-03-18 21:24 advdrv_core.ko -rw-r--r-- 1 root root 24312 2010-03-18 21:24 usb4761.ko I was able to run insmod on the first without incident, but when I try on the second, I get a flood of messages: kernel: [686782.106547] usb4761: no symbol version for adv_process_info_check_event kernel: [686782.106555] usb4761: Unknown symbol adv_process_info_check_event kernel: [686782.106691] usb4761: no symbol version for advdrv_unregister_driver kernel: [686782.106695] usb4761: Unknown symbol advdrv_unregister_driver However, advdrv_core.ko provides these symbols. My kernel sure seems to have them in memory: # cat /proc/kallsyms | grep advdrv_unregister_driver f8d88504 r __ksymtab_advdrv_unregister_driver [advdrv_core] f8d888d2 r __kstrtab_advdrv_unregister_driver [advdrv_core] f8d885a4 r __kcrctab_advdrv_unregister_driver [advdrv_core] 086eb8fb a __crc_advdrv_unregister_driver [advdrv_core] f8d86e90 t advdrv_unregister_driver [advdrv_core] Why does my insmod claim they're unknown symbols?

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