panic: kernel diagnostic assertion "vp->v_usecount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/vfs_subr.c", line 639
Starting stack trace...
panic(ffffffff830d70b0) at panic+0x1d0 sys/kern/subr_prf.c:229
__assert(ffffffff8308ab4a,ffffffff830aa06a,27f,ffffffff83026945) at __assert+0x29
vdoom(fffffd8077740c08) at vdoom+0x105 sys/kern/vfs_subr.c:641
ufs_inactive(ffff8000363eb158) at ufs_inactive+0x188 sys/ufs/ufs/ufs_inode.c:89
VOP_INACTIVE(fffffd8077740c08,ffff80003219c028) at VOP_INACTIVE+0x107 sys/kern/vfs_vops.c:495
vclean(fffffd8077740c08,8,ffff80003219c028) at vclean+0x234 sys/kern/vfs_subr.c:1107
vgonel(fffffd8077740c08,ffff80003219c028) at vgonel+0xec sys/kern/vfs_subr.c:1197
vop_generic_revoke(ffff8000363eb2e8) at vop_generic_revoke+0x32a sys/kern/vfs_default.c:105
VOP_REVOKE(fffffd8077740db8,1) at VOP_REVOKE+0x65 sys/kern/vfs_vops.c:291
ptmioctl(5100,40287401,ffff8000363eb7b0,3,ffff80003219c028) at ptmioctl+0x832 sys/kern/tty_pty.c:1172
VOP_IOCTL(fffffd806decf518,40287401,ffff8000363eb7b0,3,fffffd807f7d36e8,ffff80003219c028) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264
vn_ioctl(fffffd80714a9ab0,40287401,ffff8000363eb7b0,ffff80003219c028) at vn_ioctl+0xf6 sys/kern/vfs_vnops.c:525
sys_ioctl(ffff80003219c028,ffff8000363eb990,ffff8000363eb8e0) at sys_ioctl+0x67c
syscall(ffff8000363eb990) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff8000363eb990) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x45b24e114c0, count: 242
End of stack trace.