@&qpanic: kernel diagnostic assertion "vp->v_usecount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/vfs_subr.c", line 639
Starting stack trace...
panic(ffffffff830d710a) at panic+0x1d0 sys/kern/subr_prf.c:229
__assert(ffffffff8308c51e,ffffffff830af90e,27f,ffffffff8302bc90) at __assert+0x29
vdoom(fffffd8066d91bf0) at vdoom+0x105 sys/kern/vfs_subr.c:641
ufs_inactive(ffff80002a0f06d8) at ufs_inactive+0x188 sys/ufs/ufs/ufs_inode.c:89
VOP_INACTIVE(fffffd8066d91bf0,ffff80002a122f60) at VOP_INACTIVE+0x107 sys/kern/vfs_vops.c:495
vclean(fffffd8066d91bf0,8,ffff80002a122f60) at vclean+0x234 sys/kern/vfs_subr.c:1107
vgonel(fffffd8066d91bf0,ffff80002a122f60) at vgonel+0xec sys/kern/vfs_subr.c:1197
vop_generic_revoke(ffff80002a0f0868) at vop_generic_revoke+0x32a sys/kern/vfs_default.c:105
VOP_REVOKE(fffffd8066d72e70,1) at VOP_REVOKE+0x65 sys/kern/vfs_vops.c:291
ptmioctl(5100,40287401,ffff80002a0f0d30,3,ffff80002a122f60) at ptmioctl+0x832 sys/kern/tty_pty.c:1172
VOP_IOCTL(fffffd806e652518,40287401,ffff80002a0f0d30,3,fffffd807f7d34e0,ffff80002a122f60) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806b3e17d8,40287401,ffff80002a0f0d30,ffff80002a122f60) at vn_ioctl+0xf6 sys/kern/vfs_vnops.c:525
sys_ioctl(ffff80002a122f60,ffff80002a0f0f10,ffff80002a0f0e60) at sys_ioctl+0x67c
syscall(ffff80002a0f0f10) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff80002a0f0f10) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x1533e088060, count: 242
End of stack trace.