syzbot

panic: vrele: ref cnt
Starting stack trace...
panic(ffffffff8295b62b) at panic+0x16f sys/kern/subr_prf.c:229
vrele(fffffd80676caa30) at vrele+0x195 sys/kern/vfs_subr.c:813
fdfree(ffff800032f534b0) at fdfree+0x1e3 sys/kern/kern_descrip.c:1210
exit1(ffff800032f534b0,0,0,1) at exit1+0x38a sys/kern/kern_exit.c:199
sys_exit(ffff800032f534b0,ffff80002a24ce60,ffff80002a24cdb0) at sys_exit+0x1a sys/kern/kern_exit.c:89
syscall(ffff80002a24ce60) at syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline]
syscall(ffff80002a24ce60) at syscall+0x854 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7e3b5c72a840, count: 250
End of stack trace.