[Bug 208417] Infinite attempts to write to (broken?) flash drive, panic on detach

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208417

            Bug ID: 208417
           Summary: Infinite attempts to write to (broken?) flash drive,
                    panic on detach
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: amdmi3 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

FreeBSD 11.0-CURRENT #0 r295763.

Seems like on of my flash drives became buggy: sometimes it work well,
sometimes it gives read/write errors. The problem is, however, how FreeBSD
handles umounting of this device. After issuing `umount' it tries to write on
drive infinitely (waited for half an hour), and if the drive is detached the
system panics. No backtrace yet, but may try to reproduce and gather more info.

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