[Bug 234906] kernel panic: softdep_setup_inomapdep: dependency 0xfffff80107d15c00 for newinode already exists

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234906

            Bug ID: 234906
           Summary: kernel panic: softdep_setup_inomapdep: dependency
                    0xfffff80107d15c00 for newinode already exists
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: johanvz816 at giantfoo.org

Created attachment 201075
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=201075&action=edit
core.txt from panic

Since upgrading to 12.0-RELEASE about a week ago, i've had two of these kernel
panic.  Both occurred were when i was compiling a kernel with:

cd /usr/src && make -j 4 buildkernel ...

The machine running FreeBSD is my desktop, so there's also been firefox and
emacs running.  It's an Intel i3 M 330 CPU with 8 GB or RAM.  I'll attach dmesg
from the boot.

I was running 11.2 without issues more of last year.  After he latest 11.2 in
Oct-Nov., i had a reproducible panic at the very end of shutting down, see
223563.  The reason i mention this is mainly i had a stable system until
recently, so unless the hardware is suffering bit rot, it's otherwise
unchanged.

I'm afraid this softdep panic is not 100% reproducible.  After the machine
crashes and reboots, i can complete the same kernel compile without provoking
the panic.

I'm attaching:
   /var/crash/core.txt.2
   PAPADUM - custom kernel config -- it's mainly just a stripped down to only
the limited hardware i need.

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