[Bug 281936] dma complains about stack overflow.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281936

            Bug ID: 281936
           Summary: dma complains about stack overflow.
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: riscv
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: dgilbert@eicat.ca

I have a SciFive unmatched --- a RISC-V system.  I noticed that the console
complained about stack overflow (so I investigated).

Oct  6 07:15:52 ump dma[4c3f2.1012248050][43009]: stack overflow detected;
terminated

Is the line being output.  In this configuration, the RISC-V system only talks
to my mailserver (to forward) and does not listen.  So this fuzz is locally
generated.

Looking in maillog, I see:

Oct  8 05:19:15 ump dma[301a1.1bf7a48050][57898]: <root@daveg.ca> trying
delivery
Oct  8 05:19:16 ump dma[301a1.1bf7a48050][57898]: trying remote delivery to
mail.eicat.ca [2001:1928::4:0:0:143] pref 10
Oct  8 05:24:16 ump dma[301a1.1bf7a48050][57898]: stack overflow detected;
terminated

So ... what is the mail?  Looks like a mail loop to/from root.  Looks like the
daily and weekly mail stuff.  All locally generated.

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