syzbot

panic: ASan: Invalid access, 2-byte read at 0xfffffe00929dbae6, UMAUseAfterFree(fd)
cpuid = 1
time = 1626178719
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc7/frame 0xfffffe008f6fd1f0
kdb_backtrace() at kdb_backtrace+0xd3/frame 0xfffffe008f6fd350
vpanic() at vpanic+0x2c5/frame 0xfffffe008f6fd430
panic() at panic+0xb5/frame 0xfffffe008f6fd4f0
__asan_load2_noabort() at __asan_load2_noabort+0x167/frame 0xfffffe008f6fd5b0
sctp_inpcb_bind() at sctp_inpcb_bind+0x67d/frame 0xfffffe008f6fd6f0
sctp6_connect() at sctp6_connect+0x3e9/frame 0xfffffe008f6fd870
soconnectat() at soconnectat+0x213/frame 0xfffffe008f6fd8d0
kern_connectat() at kern_connectat+0x299/frame 0xfffffe008f6fd9b0
sys_connect() at sys_connect+0xfb/frame 0xfffffe008f6fd9f0
amd64_syscall() at amd64_syscall+0x425/frame 0xfffffe008f6fdbf0
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe008f6fdbf0
--- syscall (0, FreeBSD ELF64, nosys), rip = 0x2b459a, rsp = 0x7fffdfffdf78, rbp = 0x7fffdfffdfb0 ---
KDB: enter: panic
[ thread pid 7971 tid 110222 ]
Stopped at      kdb_enter+0x6b: movq    $0,0x28fa0fa(%rip)
db> 
db> set $lines = 0
db> set $maxwidth = 0
db> show registers
cs                        0x20
ds                        0x3b
es                        0x3b
fs                        0x13
gs                        0x1b
ss                        0x28
rax                       0x12
rcx         0x758ea3680047b394
rdx         0xdffff7c000000000
rbx                          0
rsp         0xfffffe008f6fd330
rbp         0xfffffe008f6fd350
rsi                        0x1
rdi         0xffffffff840860c0  cov_trace_pc
r8                         0x3
r9          0xfffffe008f6fce88
r10                          0
r11         0xfffffe009207f510
r12         0xfffffe009207f000
r13         0xfffffe008f6fd301
r14         0xffffffff82c418c0  .str.18
r15         0xffffffff82c418c0  .str.18
rip         0xffffffff8178e93b  kdb_enter+0x6b
rflags                    0x46
kdb_enter+0x6b: movq    $0,0x28fa0fa(%rip)
db>