[Bug 237656] "Freed UMA keg (rtentry) was not empty (18 items). Lost 1 pages of memory." seen when running sys/netipsec tests

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237656

            Bug ID: 237656
           Summary: "Freed UMA keg (rtentry) was not empty (18 items).
                    Lost 1 pages of memory." seen when running
                    sys/netipsec tests
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

I see multiple warnings from the UMA keg code when running the netipsec tunnel
tests about leaked UMA kegs. From
https://ci.freebsd.org/job/FreeBSD-head-amd64-test/11014/consoleText :

sys/netipsec/tunnel/aes_cbc_128_hmac_sha1:v4  ->  lock order reversal:
 1st 0xffffffff82096810 allprison (allprison) @
/usr/src/sys/kern/kern_jail.c:966
 2nd 0xffffffff820c4830 vnet_sysinit_sxlock (vnet_sysinit_sxlock) @
/usr/src/sys/net/vnet.c:575
stack backtrace:
#0 0xffffffff80c47773 at witness_debugger+0x73
#1 0xffffffff80c474bd at witness_checkorder+0xa7d
#2 0xffffffff80be9008 at _sx_slock_int+0x68
#3 0xffffffff80d0f687 at vnet_alloc+0x117
#4 0xffffffff80ba40a1 at kern_jail_set+0x1bb1
#5 0xffffffff80ba5b00 at sys_jail_set+0x40
#6 0xffffffff810b2e16 at amd64_syscall+0x276
#7 0xffffffff8108b5fd at fast_syscall_common+0x101
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
passed  [0.301s]
sys/netipsec/tunnel/aes_cbc_128_hmac_sha1:v6  ->  passed  [0.278s]
sys/netipsec/tunnel/aes_cbc_256_hmac_sha2_256:v4  ->  aesni0:
<AES-CBC,AES-XTS,AES-GCM,AES-ICM> on motherboard
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
passed  [0.275s]
sys/netipsec/tunnel/aes_cbc_256_hmac_sha2_256:v6  ->  passed  [0.278s]
sys/netipsec/tunnel/aes_gcm_128:v4  ->  aesni0: detached
Apr 29 18:27:50  kernel: nd6_dad_timer: called with non-tentative address
fe80:3::20:9bff:fe26:1c0a(epair2a)

Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
passed  [0.285s]
sys/netipsec/tunnel/aes_gcm_128:v6  ->  passed  [0.278s]
sys/netipsec/tunnel/aes_gcm_256:v4  ->  Freed UMA keg (rtentry) was not empty
(18 items).  Lost 1 pages of memory.
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
passed  [0.287s]
sys/netipsec/tunnel/aes_gcm_256:v6  ->  passed  [0.280s]
sys/netipsec/tunnel/aesni_aes_cbc_128_hmac_sha1:v4  ->  aesni0:
<AES-CBC,AES-XTS,AES-GCM,AES-ICM> on motherboard
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
passed  [0.291s]
sys/netipsec/tunnel/aesni_aes_cbc_128_hmac_sha1:v6  ->  passed  [0.292s]
sys/netipsec/tunnel/aesni_aes_cbc_256_hmac_sha2_256:v4  ->  aesni0: detached
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
passed  [0.296s]
sys/netipsec/tunnel/aesni_aes_cbc_256_hmac_sha2_256:v6  ->  passed  [0.257s]
sys/netipsec/tunnel/aesni_aes_gcm_128:v4  ->  aesni0:
<AES-CBC,AES-XTS,AES-GCM,AES-ICM> on motherboard
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
passed  [0.256s]
sys/netipsec/tunnel/aesni_aes_gcm_128:v6  ->  passed  [0.254s]
sys/netipsec/tunnel/aesni_aes_gcm_256:v4  ->  Freed UMA keg (rtentry) was not
empty (18 items).  Lost 1 pages of memory.
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
passed  [0.262s]
sys/netipsec/tunnel/aesni_aes_gcm_256:v6  ->  passed  [0.291s]
sys/netipsec/tunnel/empty:v4  ->  Freed UMA keg (rtentry) was not empty (18
items).  Lost 1 pages of memory.
Freed UMA keg (rtentry) was not empty (18 items).  Lost 1 pages of memory.
passed  [0.285s]
sys/netipsec/tunnel/empty:v6  ->  passed  [0.282s]

Suggested repro:

* Boot a WITNESS enabled kernel with IPSEC support.
* Run `sudo kyua test -k /usr/tests/sys/netipsec/tunnel/Kyuafile`.

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