[Bug 224479] kernel panic in reboot+swapoff sys call

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224479

--- Comment #12 from Wolfram Schneider <wosch at FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #11)

the complain is: I built and installed a new kernel on 12-current. I run
"reboot" and the kernel panics during shutdown and hangs in the kernel debugger
on the console.

It takes me less than a minute to reproduce this, see the howto in the bug
report. The machine crashes 9 out of 10 times. Pretty close to a deterministic
failure.

Apparently, there is a race condition here: we unmount a file system while
swapoff is not done yet with the swapfile on the file system.

It would be great if we can fix this. Thanks.

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