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author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-09-21 14:51:11 +0200 |
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committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-10-24 12:12:35 +0200 |
commit | 9d85025b0418163fae079c9ba8f8445212de8568 (patch) | |
tree | 4629e2dedf4a9ed45a6855c129101f9b52138372 /Documentation/init.txt | |
parent | docs-rst: add documents to development-process (diff) | |
download | linux-9d85025b0418163fae079c9ba8f8445212de8568.tar.xz linux-9d85025b0418163fae079c9ba8f8445212de8568.zip |
docs-rst: create an user's manual book
Place README, REPORTING-BUGS, SecurityBugs and kernel-parameters
on an user's manual book.
As we'll be numbering the user's manual, remove the manual
numbering from SecurityBugs.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/init.txt')
-rw-r--r-- | Documentation/init.txt | 52 |
1 files changed, 0 insertions, 52 deletions
diff --git a/Documentation/init.txt b/Documentation/init.txt deleted file mode 100644 index e89d97f31eaf..000000000000 --- a/Documentation/init.txt +++ /dev/null @@ -1,52 +0,0 @@ -Explaining the dreaded "No init found." boot hang message -========================================================= - -OK, so you've got this pretty unintuitive message (currently located -in init/main.c) and are wondering what the H*** went wrong. -Some high-level reasons for failure (listed roughly in order of execution) -to load the init binary are: - -A) Unable to mount root FS -B) init binary doesn't exist on rootfs -C) broken console device -D) binary exists but dependencies not available -E) binary cannot be loaded - -Detailed explanations: - -A) Set "debug" kernel parameter (in bootloader config file or CONFIG_CMDLINE) - to get more detailed kernel messages. -B) make sure you have the correct root FS type - (and ``root=`` kernel parameter points to the correct partition), - required drivers such as storage hardware (such as SCSI or USB!) - and filesystem (ext3, jffs2 etc.) are builtin (alternatively as modules, - to be pre-loaded by an initrd) -C) Possibly a conflict in ``console= setup`` --> initial console unavailable. - E.g. some serial consoles are unreliable due to serial IRQ issues (e.g. - missing interrupt-based configuration). - Try using a different ``console= device`` or e.g. ``netconsole=``. -D) e.g. required library dependencies of the init binary such as - ``/lib/ld-linux.so.2`` missing or broken. Use - ``readelf -d <INIT>|grep NEEDED`` to find out which libraries are required. -E) make sure the binary's architecture matches your hardware. - E.g. i386 vs. x86_64 mismatch, or trying to load x86 on ARM hardware. - In case you tried loading a non-binary file here (shell script?), - you should make sure that the script specifies an interpreter in its shebang - header line (``#!/...``) that is fully working (including its library - dependencies). And before tackling scripts, better first test a simple - non-script binary such as ``/bin/sh`` and confirm its successful execution. - To find out more, add code ``to init/main.c`` to display kernel_execve()s - return values. - -Please extend this explanation whenever you find new failure causes -(after all loading the init binary is a CRITICAL and hard transition step -which needs to be made as painless as possible), then submit patch to LKML. -Further TODOs: - -- Implement the various ``run_init_process()`` invocations via a struct array - which can then store the ``kernel_execve()`` result value and on failure - log it all by iterating over **all** results (very important usability fix). -- try to make the implementation itself more helpful in general, - e.g. by providing additional error messages at affected places. - -Andreas Mohr <andi at lisas period de> |