[ 3337.3508907] panic: kernel diagnostic assertion "vp->v_usecount != 0" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/vfs_vnode.c", line 869 [ 3337.3690574] cpu0: Begin traceback... [ 3337.3728543] vpanic() at netbsd:vpanic+0x214 [ 3337.3824759] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure [ 3337.4035064] vref() at netbsd:vref+0x54 [ 3337.4110078] getcwd_common() WAaRtN ING: SPL NneOTt bLsOdW:EgReEtDc wOd_N cSoYmSmoCAnL+L0 x11 148 [ 3337.4110078] EXIT 0 7 [ 3337.4110078] vn_isunder() at netbsd:vn_isunder+0x1e [ 3337.4110078] lookup_once() at netbsd:lookup_once+0x23f [ 3337.4110078] namei_tryemulroot() at netbsd:namei_tryemulroot+0xba6 [ 3337.4110078] namei() at netbsd:namei+0x67 [ 3337.4110078] nameiat_simple_user() at netbsd:nameiat_simple_user+0x183 [ 3337.4110078] sys_lchown() at netbsd:sys_lchown+0x7e [ 3337.4110078] sys___syscall() at netbsd:sys___syscall+0xe2 [ 3337.4110078] syscall() at netbsd:syscall+0x32e [ 3337.4110078] --- syscall (number 198) --- [ 3337.4110078] 7e580ea3f4aa: [ 3337.4110078] cpu0: End traceback... [ 3337.4110078] dumping to dev 4,1 (offset=0, size=0): not possible [ 3337.4110078] 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