[Bug 250073] LOR between cc_list and vnet_rwlock (during reboot)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250073

            Bug ID: 250073
           Summary: LOR between cc_list and vnet_rwlock (during reboot)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: gbe at FreeBSD.org

During a reboot of a recent -CURRENT installation, the following LOR is
reproducible reported.

lock order reversal:
 1st 0xffffffff827a37e0 cc_list (cc_list, rw) @
/boiler/nfs/src/sys/netinet/cc/cc.c:226
 2nd 0xffffffff827a2fd8 vnet_rwlock (vnet_rwlock, rw) @
/boiler/nfs/src/sys/netinet/cc/cc.c:189
lock order cc_list -> vnet_rwlock attempted at:
#0 0xffffffff811fe7fe at witness_checkorder+0x13de
#1 0xffffffff811468ed at __rw_rlock_int+0xcd
#2 0xffffffff8114726e at __rw_rlock+0x2e
#3 0xffffffff814134fa at cc_deregister_algo+0xaa
#4 0xffffffff814138c9 at cc_modevent+0x29
#5 0xffffffff81116542 at module_shutdown+0xb2
#6 0xffffffff8114d8c5 at kern_reboot+0x695
#7 0xffffffff8114d1db at sys_reboot+0x5fb
#8 0xffffffff81834371 at amd64_syscall+0x281
#9 0xffffffff817f4ade at fast_syscall_common+0xf8

KERNCONF is the following:

include         GENERIC
options         RATELIMIT
options         TCPHPTS
options         KERN_TLS
options         ROUTE_MPATH

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