[Bug 193269] New: panic: kdb_switch: did not reenter debugger (from sysctl debug.kdb.enter=1 w/ i915kms)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193269

            Bug ID: 193269
           Summary: panic: kdb_switch: did not reenter debugger (from
                    sysctl debug.kdb.enter=1 w/ i915kms)
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

X11 w/ i915, "sysctl debug.kdb.enter=1" from an xterm results in the following
panic:

#3  0xffffffff8090dc43 in panic (fmt=0x0)
    at /tank/emaste/src/freebsd/sys/kern/kern_shutdown.c:675
#4  0xffffffff80916ed4 in mi_switch (flags=<value optimized out>,
    newtd=<value optimized out>)
    at /tank/emaste/src/freebsd/sys/kern/kern_synch.c:424
#5  0xffffffff80953262 in sleepq_switch (wchan=<value optimized out>,
    pri=<value optimized out>)
    at /tank/emaste/src/freebsd/sys/kern/subr_sleepqueue.c:552
#6  0xffffffff809537c3 in sleepq_timedwait (wchan=0xffffffff815bdc82, pri=0)
    at /tank/emaste/src/freebsd/sys/kern/subr_sleepqueue.c:666
#7  0xffffffff8091670a in _sleep (ident=<value optimized out>,
    lock=<value optimized out>, priority=<value optimized out>,
    wmesg=<value optimized out>, sbt=<value optimized out>,
    pr=<value optimized out>)
    at /tank/emaste/src/freebsd/sys/kern/kern_synch.c:251
#8  0xffffffff80916be4 in pause_sbt (wmesg=0xffffffff8205e826 "915vbl",
    sbt=<value optimized out>, pr=0, flags=256)
    at /tank/emaste/src/freebsd/sys/kern/kern_synch.c:380
#9  0xffffffff8202d0d8 in intel_wait_for_vblank (dev=<value optimized out>,
    pipe=<value optimized out>)
    at
/tank/emaste/src/freebsd/sys/modules/drm2/i915kms/../../../dev/drm2/i915/
intel_display.c:736
#10 0xffffffff82035459 in intel_pipe_set_base (crtc=0xfffff80012ef8800, x=0,
    y=0, old_fb=0xfffff800141bcd80)
    at
/tank/emaste/src/freebsd/sys/modules/drm2/i915kms/../../../dev/drm2/i915/
intel_display.c:2340
#11 0xffffffff8207e960 in drm_crtc_helper_set_config (set=0xfffff8025603e208)
    at
/tank/emaste/src/freebsd/sys/modules/drm2/drm2/../../../dev/drm2/drm_crtc
_helper.c:746
#12 0xffffffff82085b7c in vt_kms_postswitch (arg=<value optimized out>)
    at
/tank/emaste/src/freebsd/sys/modules/drm2/drm2/../../../dev/drm2/drm_fb_h
elper.c:396
#13 0xffffffff807bae53 in vt_window_switch (vw=0xffffffff81467cb8)
    at /tank/emaste/src/freebsd/sys/dev/vt/vt_core.c:387
#14 0xffffffff807b9123 in vtterm_cngrab (tm=<value optimized out>)
    at /tank/emaste/src/freebsd/sys/dev/vt/vt_core.c:1238
#15 0xffffffff808c15c5 in cngrab ()
    at /tank/emaste/src/freebsd/sys/kern/kern_cons.c:360
#16 0xffffffff809468d3 in kdb_trap (type=3, code=0, tf=<value optimized out>)
    at /tank/emaste/src/freebsd/sys/kern/subr_kdb.c:651
#17 0xffffffff80d23c02 in trap (frame=0xfffffe046320e6e0)
    at /tank/emaste/src/freebsd/sys/amd64/amd64/trap.c:542
#18 0xffffffff80d059e2 in calltrap ()
    at /tank/emaste/src/freebsd/sys/amd64/amd64/exception.S:231
#19 0xffffffff80946b71 in kdb_sysctl_enter (oidp=<value optimized out>,
    arg1=<value optimized out>, arg2=-2180180285808, req=<value optimized out>)
    at cpufunc.h:63
#20 0xffffffff80919828 in sysctl_root_handler_locked (oid=0xffffffff8148bf80,
    arg1=0x0, arg2=0, req=0xfffffe046320e868)
    at /tank/emaste/src/freebsd/sys/kern/kern_sysctl.c:153

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