panic: mtx_lock() of destroyed mutex @ /syzkaller/managers/i386/kernel/sys/kern/sys_socket.c:316
cpuid = 0
time = 1571146530
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00243c35e0
vpanic() at vpanic+0x1c7/frame 0xfffffe00243c3650
panic() at panic+0x43/frame 0xfffffe00243c36b0
__mtx_lock_flags() at __mtx_lock_flags+0x1e3/frame 0xfffffe00243c3710
soo_stat() at soo_stat+0x13b/frame 0xfffffe00243c3750
kern_fstat() at kern_fstat+0xed/frame 0xfffffe00243c37a0
freebsd32_fstat() at freebsd32_fstat+0x2b/frame 0xfffffe00243c3970
ia32_syscall() at ia32_syscall+0x466/frame 0xfffffe00243c3ab0
int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0x814266a
KDB: enter: panic
[ thread pid 9139 tid 100334 ]
Stopped at      kdb_enter+0x67: movq    $0,0x1477646(%rip)