[Bug 218167] ctl(4): calling _callout_stop_safe with the following non-sleepable locks held

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218167

            Bug ID: 218167
           Summary: ctl(4): calling _callout_stop_safe with the following
                    non-sleepable locks held
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

While exploring cfumass(4) I received a warning, using a recent SD card
snapshot.

Uname:

FreeBSD beaglebone 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r315864: Thu Mar 23
22:59:22 UTC 2017    
root at releng3.nyi.freebsd.org:/usr/obj/arm.armv6/usr/src/sys/BEAGLEBONE  arm

Warning:

root at beaglebone:~ # ctladm create -b block -o file=/data/target0
ctladm: LUN creation warning: error opening /data/target0: 2
LUN created successfully
backend:       block
device type:   0
LUN size:      0 bytes
blocksize      512 bytes
LUN ID:        0
Serial Number: MYSERIAL   0
Device ID;     MYDEVID   0
root at beaglebone:~ # ctladm remove -b block -l 0
calling _callout_stop_safe with the following non-sleepable locks held:
exclusive sleep mutex CTL mutex (CTL mutex) r = 0 (0xc36bd000) locked @
/usr/src/sys/cam/ctl/ctl.c:5030
stack backtrace:
LUN 0 removed successfully

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