[Bug 266284] tests/usr.bin/tail/tail:follow_stdin is flaky

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266284

            Bug ID: 266284
           Summary: tests/usr.bin/tail/tail:follow_stdin is flaky
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: markj@FreeBSD.org

This test fails occasionally in CI, also locally for me.  tail(1) crashes when
the test fails, so it appears to be a real bug.  The crash doesn't happen when
ASLR is disabled.

Program terminated with signal SIGBUS, Bus error.
Object-specific hardware error.
#0  rlines (fp=0x1d9c41e5d630, fn=0x1d941c249630 "stdin", off=10,
sbp=0x1d9c3d0a89b8) at /root/freebsd/usr.bin/tail/forward.c:219
219     /root/freebsd/usr.bin/tail/forward.c: No such file or directory.
(gdb) bt
#0  rlines (fp=0x1d9c41e5d630, fn=0x1d941c249630 "stdin", off=10,
sbp=0x1d9c3d0a89b8) at /root/freebsd/usr.bin/tail/forward.c:219
#1  forward (fp=0x1d9c41e5d630, fn=0x1d941c249630 "stdin",
style=style@entry=RLINES, off=off@entry=10, sbp=sbp@entry=0x1d9c3d0a89b8) at
/root/freebsd/usr.bin/tail/forward.c:167
#2  0x00001d941c24b5c9 in follow (files=files@entry=0x1d9c3d0a89a8,
style=1149239296, off=2564102) at /root/freebsd/usr.bin/tail/forward.c:330
#3  0x00001d941c24d632 in main (argc=0, argv=<optimized out>) at
/root/freebsd/usr.bin/tail/tail.c:276

"info proc map"'s output has the following suspicious-looking line:

0x1d9c44800000     0x1d9c44a73000   0x273000 0x1d9c3e400000  r-- ----
/tmp/infile

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