[Bug 230655] vlan(4) holds non-sleepable locks around driver ioctls

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230655

            Bug ID: 230655
           Summary: vlan(4) holds non-sleepable locks around driver ioctls
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: np at FreeBSD.org
                CC: mmacy at FreeBSD.org, shurd at FreeBSD.org

There was recent work in the stack to not hold non-sleepable locks around
NIC driver ioctls.  It seems that vlan(4) still does.


begin_synchronized_op with the following non-sleepable locks held:
exclusive rm vlan (vlan) r = 0 (0xfffff8000459e388) locked @
/root/ws/head/sys/net/if_vlan.c:1917
shared rm vlan_rm (vlan_rm) r = 0 (0xffffffff827e9480) locked @
/root/ws/head/sys/net/if_vlan.c:1914
stack backtrace:
#0 0xffffffff81238331 at witness_debugger+0xf1
#1 0xffffffff812398a8 at witness_warn+0x3b8
#2 0xffffffff8326296c at begin_synchronized_op+0x6c
#3 0xffffffff83275b72 at cxgbe_ioctl+0x382
#4 0xffffffff8132e24a at if_addmulti+0x38a
#5 0xffffffff8134ebf4 at vlan_setmulti+0x384
#6 0xffffffff8134dbc7 at vlan_ioctl+0x797
#7 0xffffffff8132e24a at if_addmulti+0x38a
#8 0xffffffff814181c8 at in_getmulti+0x178
#9 0xffffffff81417ee8 at in_joingroup_locked+0xb8
#10 0xffffffff81417e0a at in_joingroup+0x4a
#11 0xffffffff8140f326 at in_aifaddr_ioctl+0xe46
#12 0xffffffff8140d6f8 at in_control+0x228
#13 0xffffffff8132abdd at ifioctl+0x7fd
#14 0xffffffff8124e4ce at soo_ioctl+0x79e
#15 0xffffffff8124053c at fo_ioctl+0x4c
#16 0xffffffff81240291 at kern_ioctl+0x361
#17 0xffffffff8123fe6a at sys_ioctl+0x2ea

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