[Bug 254309] [tcp] frequent panics in tcp_output

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254309

--- Comment #7 from rozhuk.im at gmail.com ---
#10 0xffffffff8076ec3a in tcp_output (tp=0xfffffe01137c60c0) at
/usr/src/sys/netinet/tcp_output.c:1068
1068                            m_copydata(mb, moff, len,
(kgdb) info locals
moff = 0
mb = 0xfffff802a20ba800
msb = <optimized out>
opt =
"\001\001\b\n\325\035\060\267+\223/\264\001\376\377\377\001M\373\267\000\000\000\000\340`|\023\001\376\377\377\250\005\000\000\000\000\000"
to = {to_flags = 16, to_tsval = 3073383893, to_tsecr = 3023016747, to_sacks =
0xfffffe001eacac00 "\300P\254\036", 
  to_signature = 0x11ea8d0c0 <error: Cannot access memory at address
0x11ea8d0c0>, to_tfo_cookie = 0xfe <error: Cannot access memory at address
0xfe>, 
  to_mss = 8288, to_wscale = 229 '\345', to_nsacks = 197 '\305', to_tfo_len = 0
'\000', to_spare = 3535675904}
hw_tls = false
isipv6 = <optimized out>
ip6 = 0x0
dont_sendalot = 0
wanted_cookie = 0
ip = 0xfffff8020e774668
if_hw_tsomaxsegsize = 0
if_hw_tsomaxsegcount = 0
error = <optimized out>
so = <optimized out>
idle = 0
sendalot = 1
tso = 0
flags = 17
recwin = 2098020
sack_rxmit = 1
p = 0xfffff802a256ef20
off = 32622
mtu = 0
sendwin = <optimized out>
sack_bytes_rxmt = <optimized out>
len = 1
ipoptlen = <optimized out>
optlen = <optimized out>
hdrlen = <optimized out>
curticks = <optimized out>
m = 0xfffff8020eecec00
th = <optimized out>

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