Root/Documentation/debugging-modules.txt

Source at commit be977234bfb4a6dca8a39e7c52165e4cd536ad71 created 12 years 9 months ago.
By Lars-Peter Clausen, jz4740: Fix compile error
1Debugging Modules after 2.6.3
2-----------------------------
3
4In almost all distributions, the kernel asks for modules which don't
5exist, such as "net-pf-10" or whatever. Changing "modprobe -q" to
6"succeed" in this case is hacky and breaks some setups, and also we
7want to know if it failed for the fallback code for old aliases in
8fs/char_dev.c, for example.
9
10In the past a debugging message which would fill people's logs was
11emitted. This debugging message has been removed. The correct way
12of debugging module problems is something like this:
13
14echo '#! /bin/sh' > /tmp/modprobe
15echo 'echo "$@" >> /tmp/modprobe.log' >> /tmp/modprobe
16echo 'exec /sbin/modprobe "$@"' >> /tmp/modprobe
17chmod a+x /tmp/modprobe
18echo /tmp/modprobe > /proc/sys/kernel/modprobe
19
20Note that the above applies only when the *kernel* is requesting
21that the module be loaded -- it won't have any effect if that module
22is being loaded explicitly using "modprobe" from userspace.
23

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