linux-kernel - printk() not outputting

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 9 Oct 2009 13:22:06 -0500
From:	Richard Langly <richard.ringo.langly@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: printk() not outputting

I've got a problem making it hard for me to debug. For some reason, my
printk()'s aren't putting anything out to my /var/log/messages file. I
am running X so, as I understand it, messages won't appear in the
terminals where I insmod the module. But they should appear in
/var/log/messages.

If I load my test module, I do get a message from /var/log/messages saying ....

Oct  3 14:50:04 Tux sudo:   whisper : TTY=pts/12 ;
PWD=/home/whisper/test-mod/kernel/net/tm ; USER=root ;
COMMAND=/sbin/insmod mymod.ko

My problem appears as simple as this.
static int __init my_init(void) {
    printk(KERN_CRIT "my_init ...\n");

    // ...

    return 0;
}

static void __exit my_exit(void) {
    printk(KERN_INFO "my_exit ...\n");
}

Also, the values in my /proc/sys/kernel/printk file are:
8 4 1 7

So I changed the first value to 8, and I still don't see messages in
my /var/log/messages file, nor using dmesg.

When I load the module, it's just this ...
make
sudo depmod -a
sudo insmod ./mymod.ko

And I don't see anything in my syslog-ng.conf that would prevent this.

Any help much appreciated.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/