panic: general protection fault from uipc_sockaddr+0x4c

I just got this panic:

Fatal trap 9: general protection fault while in kernel mode
cpuid = 9; apic id = 09
instruction pointer = 0x20:0xffffffff80bc6e22
stack pointer         = 0x28:0xfffffe0698887630
frame pointer         = 0x28:0xfffffe06988876b0
code segment  = base 0x0, limit 0xfffff, type 0x1b
   = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process  = 45966 (fstat)
trap number  = 9
panic: general protection fault
cpuid = 9
time = 1607416693
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0698887340
vpanic() at vpanic+0x181/frame 0xfffffe0698887390
panic() at panic+0x43/frame 0xfffffe06988873f0
trap_fatal() at trap_fatal+0x387/frame 0xfffffe0698887450
trap() at trap+0xa4/frame 0xfffffe0698887560
calltrap() at calltrap+0x8/frame 0xfffffe0698887560
--- trap 0x9, rip = 0xffffffff80bc6e22, rsp = 0xfffffe0698887630, rbp = 0xfffffe06988876b0 ---
__mtx_lock_sleep() at __mtx_lock_sleep+0xd2/frame 0xfffffe06988876b0
__mtx_lock_flags() at __mtx_lock_flags+0xe5/frame 0xfffffe0698887700
uipc_sockaddr() at uipc_sockaddr+0x4c/frame 0xfffffe0698887730
soo_fill_kinfo() at soo_fill_kinfo+0x11e/frame 0xfffffe0698887770
kern_proc_filedesc_out() at kern_proc_filedesc_out+0xb57/frame 0xfffffe0698887810
sysctl_kern_proc_filedesc() at sysctl_kern_proc_filedesc+0x7d/frame 0xfffffe0698887890
sysctl_root_handler_locked() at sysctl_root_handler_locked+0x9c/frame 0xfffffe06988878e0
sysctl_root() at sysctl_root+0x20d/frame 0xfffffe0698887960
userland_sysctl() at userland_sysctl+0x180/frame 0xfffffe0698887a10
sys___sysctl() at sys___sysctl+0x5f/frame 0xfffffe0698887ac0
amd64_syscall() at amd64_syscall+0x147/frame 0xfffffe0698887bf0
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0698887bf0
--- syscall (202, FreeBSD ELF64, sys___sysctl), rip = 0x8003948ea, rsp = 0x7fffffffc138, rbp = 0x7fffffffc170 ---

https://people.freebsd.org/~pho/stress/log/log0004.txt

- Peter