[Bug 272666] FreeBSD arm64 Azure panic in add_route

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272666

            Bug ID: 272666
           Summary: FreeBSD arm64 Azure panic in add_route
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm@FreeBSD.org
          Reporter: schakrabarti@microsoft.com

In the recent FreeBSD arm64 community preview image in Azure, during reboot, I
am seeing this panic sometime:

.
ELF ldconfig path: /lib /usr/lib /usr/lib/compat /usr/local/lib
/usr/local/lib/compat/pkg /usr/local/lib/compat/pkg
lo0: link state changed to UP
Kernel page fault with the following non-sleepable locks held:
exclusive rm rib head lock (rib head lock) r = 0 (0xffffa000012278e0) locked @
/usr/src/sys/net/route/route_ctl.c:797
stack backtrace:
#0 0xffff0000004d2af4 at witness_debugger+0x5c
#1 0xffff0000004d3cf8 at witness_warn+0x400
#2 0xffff0000007f7310 at data_abort+0xa0
#3 0xffff0000007d3014 at handle_el1h_sync+0x14
  x0: 0x0000000000000001
  x1: 0x0000000000000100
  x2: 0xffffa00001ae7000
  x3: 0xffff00004031af40 ($d.2 + 0x3efee96f)
  x4: 0x0000000000000100
  x5: 0x0000000000000000
  x6: 0x000000000000003f
  x7: 0x0000000000000000
  x8: 0xffff000132c76c40
  x9: 0x0000000000000000
 x10: 0x0000000000000008
 x11: 0x0000000000000000
 x12: 0x000000000000003e
 x13: 0xffffa00001ae70fc
 x14: 0x0000000000000000
 x15: 0x0000000000000001
 x16: 0x0000000000010000
 x17: 0x0000000000000005
 x18: 0xffff00012d2f7e60
 x19: 0xffff00012d2f8080
 x20: 0xffffa00001227800
 x21: 0x0000000000000000
 x22: 0xdeadc0dedeadc0de
 x23: 0xffffa000012278e0
 x24: 0xffffa00001227800
 x25: 0xffffa0000c93ba00
 x26: 0xffff000000960582 (digits + 0x12fbf)
 x27: 0xffffa0000c9338f0
 x28: 0x0000000000000000
 x29: 0xffff00012d2f7e60
  sp: 0xffff00012d2f7e60
  lr: 0xffff0000005bf63c (rib_notify + 0x50)
 elr: 0xffffa0000c93bb00
spsr: 0x0000000060400045
 far: 0xffffa0000c93bb00
 esr: 0x000000008600000e
panic: data abort in critical section or under mutex
cpuid = 3
time = 1690047394
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
vpanic() at vpanic+0x13c
panic() at panic+0x44
data_abort() at data_abort+0x30c
handle_el1h_sync() at handle_el1h_sync+0x14
--- exception, esr 0x8600000e
(null)() at 0xffffa0000c93bb00
add_route() at add_route+0xc4
add_route_flags() at add_route_flags+0x1b0
rib_add_route() at rib_add_route+0x324
ifa_maintain_loopback_route() at ifa_maintain_loopback_route+0xf4
in6_update_ifa() at in6_update_ifa+0x994
in6_ifattach() at in6_ifattach+0x1bc
in6_if_up() at in6_if_up+0x90
if_up() at if_up+0xd8
ifhwioctl() at ifhwioctl+0xb7c
ifioctl() at ifioctl+0x860
kern_ioctl() at kern_ioctl+0x2dc
sys_ioctl() at sys_ioctl+0x118
do_el0_sync() at do_el0_sync+0x520
handle_el0_sync() at handle_el0_sync+0x44
--- exception, esr 0x56000000
KDB: enter: panic
[ thread pid 203 tid 100109 ]
Stopped at      kdb_enter+0x44: str     xzr, [x19, #3328]
db> bt
Tracing pid 203 tid 100109 td 0xffff000132c76c40
db_trace_self() at db_trace_self
db_stack_trace() at db_stack_trace+0x11c
db_command() at db_command+0x2d8
db_command_loop() at db_command_loop+0x54
db_trap() at db_trap+0xf8
kdb_trap() at kdb_trap+0x20c
handle_el1h_sync() at handle_el1h_sync+0x14
--- exception, esr 0xf2000000
kdb_enter() at kdb_enter+0x44
vpanic() at vpanic+0x178
panic() at panic+0x44
data_abort() at data_abort+0x30c
handle_el1h_sync() at handle_el1h_sync+0x14
--- exception, esr 0x8600000e
(null)() at 0xffffa0000c93bb00
add_route() at add_route+0xc4
add_route_flags() at add_route_flags+0x1b0
rib_add_route() at rib_add_route+0x324
ifa_maintain_loopback_route() at ifa_maintain_loopback_route+0xf4
in6_update_ifa() at in6_update_ifa+0x994
in6_ifattach() at in6_ifattach+0x1bc
in6_if_up() at in6_if_up+0x90
if_up() at if_up+0xd8
ifhwioctl() at ifhwioctl+0xb7c
ifioctl() at ifioctl+0x860
kern_ioctl() at kern_ioctl+0x2dc
sys_ioctl() at sys_ioctl+0x118
do_el0_sync() at do_el0_sync+0x520
handle_el0_sync() at handle_el0_sync+0x44
--- exception, esr 0x56000000
db> 

The uname details:
14.0-CURRENT FreeBSD 14.0-CURRENT #1 main-n263931-5aee3e14d491-dirty: Mon Jul 
3 14:15:14 UTC 2023    
root@poudriere:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC arm64

And ifconfig details :
schakrabarti@schakrabarti-freebsd-arm:~ $ ifconfig -a
lo0: flags=1008049<UP,LOOPBACK,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet 127.0.0.1 netmask 0xff000000
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
        groups: lo
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
hn0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0
mtu 1500
        options=0
        ether 00:0d:3a:1b:a5:92
        inet 10.0.0.4 netmask 0xffffff00 broadcast 10.0.0.255
        media: Ethernet 100GBase-CR4 <full-duplex,rxpause,txpause>
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
mce0: flags=1008a43<UP,BROADCAST,RUNNING,ALLMULTI,SIMPLEX,MULTICAST,LOWER_UP>
metric 0 mtu 1500
       
options=18a00a8<VLAN_MTU,JUMBO_MTU,VLAN_HWCSUM,NV,LINKSTATE,HWSTATS,TXRTLMT>
        ether 00:0d:3a:1b:a5:92
        media: Ethernet 100GBase-CR4 <full-duplex,rxpause,txpause>
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

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