freebsd stable - Apr 2018 - [Bug 227603] [panic] r323477: Sleeping thread owns a non-sleepable lock

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227603

            Bug ID: 227603
           Summary: [panic] r323477: Sleeping thread owns a non-sleepable
                    lock
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: crash
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: mjoras at freebsd.org
          Reporter: eugen at freebsd.org
                CC: net at FreeBSD.org, stable at FreeBSD.org

Created attachment 192611
  -->
https://bugs.freebsd.org/bugzilla/attachment.cgi?id=192611&action=edit
kgdb backtrace

The change https://svnweb.freebsd.org/base?view=revision&revision=r323477
makes
it possible for kernel thread to sleep on sx lock in vlan_ioctl() function
while holding mutex bpf_mtx that is prohibited and leads to panic.

kgdb session is attached.

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Matthew Macy <mmacy at nextbsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mmacy at nextbsd.org

--- Comment #1 from Matthew Macy <mmacy at nextbsd.org> ---
This is fixed in HEAD. I'll ask shurd to MFC the fix.

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Stephen Hurd <shurd at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|mjoras at freebsd.org          |shurd at FreeBSD.org
                 CC|                            |shurd at FreeBSD.org

--- Comment #2 from Stephen Hurd <shurd at FreeBSD.org> ---
Can you test with r332734 and ensure the issue is resolved?

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Eugene Grosbein <eugen at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |In Progress
           See Also|                            |https://reviews.freebsd.org
                   |                            |/D14982

--- Comment #3 from Eugene Grosbein <eugen at freebsd.org> ---
(In reply to Stephen Hurd from comment #2)

I've applied the fix from https://reviews.freebsd.org/D14982.
While shutting old kernel down to reboot with new kernel, it paniced again with
the same backtrace.

Now I run the system with the fix and will respond if something bad happens or
in a week in case of normal work.

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--- Comment #4 from Stephen Hurd <shurd at FreeBSD.org> ---
How's it looking?

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Eugene Grosbein <eugen at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|In Progress                 |Closed

--- Comment #5 from Eugene Grosbein <eugen at freebsd.org> ---
(In reply to Stephen Hurd from comment #4)

No problems at all with r332734 applied. Thank you!

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