[Bug 195395] serial console as qemu-kvm guest stops responding freezes on duplex I/O

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195395

--- Comment #1 from Taketo Kabe <bkabe at vega.pgw.jp> ---
kill -HUP ing the getty doesn't change anything.
kill -KILL ing the getty results in unkillable getty going CPU 100% and not
exitting.
  0 598    1   0 102  0 14488 1980 -        REs+ u0- 0:43.47 /usr/libexec/getty
3wire.9600 ttyu0

spinlock or something?

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