Re: [uml-user] Failed to forward 0 to pid

[James W M. <mcm...@ju...>]

Well, it is not a common error as you have seen.
I don't know if anyone else is using the selinux patch with UML, I would
expect it to mostly work as UML is often used for testing to find
problems.

Where exactly EBADF(9) bad file number is occurring is not clear from
your error message, a search of the my kernel pool (2.4.20-5um) yields
arch/um/kernel/irq_user.c:392 where the error message indicates that it
tried and failed to deliver a irq for fd 0 (stdin?) to what I guess are
tracing threads.

Does the error still appear without the selinux patches in the UML
kernel?

Does stock 2.4.20 host kernel mean a debian stock or a kernel.org 2.4.20,
I am assuming that both the host kernel and UML kernel are from the
kernel.org tree (UML with the 2.4.20-4um patch)

Since you said stock I am assuming that you have not applied the SKAS
patch, correct?

If you are not using SKAS you can add debug to your UML command line
which will open a gdb window and you can set a breakpoint at
irq_user.c:392 (the printk statement) hopefully a "(gdb) bt" back trace
will yield more information about what is happening, and "(gdb) print
*irq" may also be useful

If you are using SKAS you can start UML under gdb and debug that way
instead.

James McMechan

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