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48 lines
2.6 KiB
48 lines
2.6 KiB
Explaining the "No working init found." boot hang message |
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:Authors: Andreas Mohr <andi at lisas period de> |
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Cristian Souza <cristianmsbr at gmail period com> |
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This document provides some high-level reasons for failure |
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(listed roughly in order of execution) to load the init binary. |
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1) **Unable to mount root FS**: Set "debug" kernel parameter (in bootloader |
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config file or CONFIG_CMDLINE) to get more detailed kernel messages. |
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2) **init binary doesn't exist on rootfs**: Make sure you have the correct |
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root FS type (and ``root=`` kernel parameter points to the correct |
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partition), required drivers such as storage hardware (such as SCSI or |
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USB!) and filesystem (ext3, jffs2, etc.) are builtin (alternatively as |
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modules, to be pre-loaded by an initrd). |
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3) **Broken console device**: Possibly a conflict in ``console= setup`` |
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--> initial console unavailable. E.g. some serial consoles are unreliable |
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due to serial IRQ issues (e.g. missing interrupt-based configuration). |
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Try using a different ``console= device`` or e.g. ``netconsole=``. |
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4) **Binary exists but dependencies not available**: E.g. required library |
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dependencies of the init binary such as ``/lib/ld-linux.so.2`` missing or |
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broken. Use ``readelf -d <INIT>|grep NEEDED`` to find out which libraries |
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are required. |
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5) **Binary cannot be loaded**: Make sure the binary's architecture matches |
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your hardware. E.g. i386 vs. x86_64 mismatch, or trying to load x86 on ARM |
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hardware. In case you tried loading a non-binary file here (shell script?), |
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you should make sure that the script specifies an interpreter in its |
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shebang header line (``#!/...``) that is fully working (including its |
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library dependencies). And before tackling scripts, better first test a |
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simple non-script binary such as ``/bin/sh`` and confirm its successful |
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execution. To find out more, add code ``to init/main.c`` to display |
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kernel_execve()s return values. |
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Please extend this explanation whenever you find new failure causes |
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(after all loading the init binary is a CRITICAL and hard transition step |
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which needs to be made as painless as possible), then submit a patch to LKML. |
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Further TODOs: |
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- Implement the various ``run_init_process()`` invocations via a struct array |
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which can then store the ``kernel_execve()`` result value and on failure |
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log it all by iterating over **all** results (very important usability fix). |
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- Try to make the implementation itself more helpful in general, e.g. by |
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providing additional error messages at affected places. |
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