login: [ 264.6969097] panic: kernel diagnostic assertion "vp->v_usecount != 0" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/vfs_vnode.c", line 869 [ 264.7086772] cpu0: Begin traceback... [ 264.7086772] vpanic() at netbsd:vpanic+0x214 [ 264.7191626] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure [ 264.7302907] vref() at netbsd:vref+0x54 [ 264.7414166] getcwd_common() at netbsd:getcwd_common+0x118 [ 264.7525422] vn_isunder() at netbsd:vn_isunder+0x1e [ 264.7636663] lookup_once() at netbsd:lookup_once+0x23f [ 264.7748332] namei_tryemulroot() at netbsd:namei_tryemulroot+0xba6 [ 264.7859194] namei() at netbsd:namei+0x67 [ 264.7971210] fd_nameiat.isra.2() at netbsd:fd_nameiat.isra.2+0xd9 [ 264.8192941] do_sys_mkdirat.constprop.5() at netbsd:do_sys_mkdirat.constprop.5+0x223 [ 264.8304201] sys___syscall() at netbsd:sys___syscall+0xe2 [ 264.8415473] syscall() at netbsd:syscall+0x32e [ 264.8535685] --- syscall (number 198) --- [ 264.8535685] 76ebee03f4aa: [ 264.8535685] cpu0: End traceback... [ 264.8675240] dumping to dev 4,1 (offset=0, size=0): not possible [ 264.8675240] rebooting... SeaBIOS (version 1.8.2-20190122_225043-google) Total RAM Size = 0x00000001e0000000 = 7680 MiB CPUs found: 2 Max CPUs supported: 2 found virtio-scsi at 0:3 virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0 virtio-scsi blksize=512 sectors=4194304 = 2048 MiB drive 0x000f29c0: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304 Booting from Hard Disk 0... >> NetBSD/x86 BIOS Boot, Revision 5.10 (Tue Jul 17 14:59:51 UTC 2018) (from NetBSD 8.0) >> Memory: 639/3144640 k 1. Boot normally 2. Boot single user 3. Disable ACPI 4. Disable ACPI and SMP 5. Drop to boot prompt