panic: kernel diagnostic assertion "ps->ps_uvncount == 0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_unveil.c", line 188
Starting stack trace...
panic(ffffffff82927b8e) at panic+0x159 sys/kern/subr_prf.c:229
__assert(ffffffff828e10c6,ffffffff828b33eb,bc,ffffffff82866e64) at __assert+0x29 sys/kern/subr_prf.c:157
unveil_destroy(ffff8000378b0cb0) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188
exit1(ffff80002a678ac0,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218
sys_exit(ffff80002a678ac0,ffff80002f53b3c0,ffff80002f53b310) at sys_exit+0x1a sys/kern/kern_exit.c:89
syscall(ffff80002f53b3c0) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x74d31307ade0, count: 250
End of stack trace.
syncing disks...panic: ffs_update: bad link cnt
Starting stack trace...
panic(ffffffff828b8a4a) at panic+0x159 sys/kern/subr_prf.c:229
ffs_update(fffffd80733ea1f0,0) at ffs_update+0x2da sys/ufs/ffs/ffs_inode.c:99
VOP_FSYNC(fffffd8069078ce0,fffffd807f7d7680,2,ffff80002a678ac0) at VOP_FSYNC+0xc9 sys/kern/vfs_vops.c:311
ffs_sync_vnode(fffffd8069078ce0,ffff80002f53af18) at ffs_sync_vnode+0x16b sys/ufs/ffs/ffs_vfsops.c:1081
vfs_mount_foreach_vnode(ffff8000006c7800,ffffffff81c0dd80,ffff80002f53af18) at vfs_mount_foreach_vnode+0x55 sys/kern/vfs_subr.c:910
ffs_sync(ffff8000006c7800,2,0,fffffd807f7d7680,ffff80002a678ac0) at ffs_sync+0x104 sys/ufs/ffs/ffs_vfsops.c:1131
sys_sync(ffff80002a678ac0,0,0) at sys_sync+0xbc sys/kern/vfs_syscalls.c:536
vfs_syncwait(ffff80002a678ac0,1) at vfs_syncwait+0x3b
vfs_shutdown(ffff80002a678ac0) at vfs_shutdown+0x61 sys/kern/vfs_subr.c:1791
boot(100) at boot+0xe0 sys/arch/amd64/amd64/machdep.c:903
reboot(100) at reboot+0x7b
panic(ffffffff82927b8e) at panic+0x179 sys/kern/subr_prf.c:231
__assert(ffffffff828e10c6,ffffffff828b33eb,bc,ffffffff82866e64) at __assert+0x29 sys/kern/subr_prf.c:157
unveil_destroy(ffff8000378b0cb0) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188
exit1(ffff80002a678ac0,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218
sys_exit(ffff80002a678ac0,ffff80002f53b3c0,ffff80002f53b310) at sys_exit+0x1a sys/kern/kern_exit.c:89
syscall(ffff80002f53b3c0) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x74d31307ade0, count: 239
End of stack trace.

dump to dev 4,1 not possible
rebooting...
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x0000000080000000 = 2048 MiB
CPUs found: 2     Max CPUs supported: 2
SeaBIOS (version 1.8.2-google)
Machine UUID 1498d526-897b-4d0e-28be-a262cd523d51
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 0x000f27f0: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Sending Seabios boot VM event.
Booting from Hard Disk 0...
>> OpenBSD/amd64 BOOT 3.65
boot> set $maxwidth = 0
set: syntax error
boot> show panic
boot: illegal argument panic
boot> trace
boot> show registers
boot> show proc
boot> ps
boot> show all locks
boot> show malloc
boot> show all pools
boot> machine ddbcpu 0
machine: syntax error
boot> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace