[Bug 198231] [unionfs] deadlock

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Thu Aug 1 16:09:49 UTC 2019


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198231

--- Comment #3 from Andre Albsmeier <mail at fbsd.e4m.org> ---
I have to revise my statement...

I ran the test below for about 10-20 seconds and was happy to see that it
doesn't hang the box anymore. Then I wrote the last comment (#2). After that
I continued with my regular work (some vi, ssh, firefox, ...). I did NOT
unmount
the two unionfs on /tmp so they remained in the state they had after aborting
the test. Approx 2.5 hours later the machine suddenly hung with exactly the
same
symptoms as described (mouse OK, KBD OK, no fs, no Ctrl-Alt-Del, had to go to
the
console and restart using the debugger).

I did not touch the two mount points /tmp/1 and /tmp/2 but I used /usr/local
(read-only) of course and a lot of rw on /tmp.

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