[Bug 209025] boot hangs at "Trying to mount root from zfs:zroot ..."

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209025

--- Comment #1 from Thomas Schweikle <tps at vr-web.de> ---
After upgrading the boot loader as suggested by entry

20160306:
        On amd64, clang 3.8.0 can now insert sections of type AMD64_UNWIND into
        kernel modules.  Therefore, if you load any kernel modules at boot
time,
        please install the boot loaders after you install the kernel, but
before
        rebooting, e.g.:

        make buildworld
        make kernel KERNCONF=YOUR_KERNEL_HERE
        make -C sys/boot install
        <reboot in single user>

        Then follow the usual steps, described in the General Notes section,
        below.

the loader is able to list directory /boot/kernel.wrk, but setting module_path
to /boot/kernel.wrk leads to "Not found" -- in tune the whole boot system is
broken and wont work any more. It is:

- impossible to load a kernel (even giving the full path)
- impossible to load modules (even giving the full path)
- gmirror, zpool dump core.

booting is broken today to a state nearly impossible to fix.

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