Oct  1 20:21:06 ci2-netbsd-2 getty[1193]: /dev/ttyE1: Device not configured

NetBSD/amd64 (ci2-netbsd-2.c.syzkaller.internal) (constty)

login: Oct  1 20:21:07 ci2-netbsd-2 getty[1083]: /dev/ttyE3: Device not configured
Oct  1 20:21:07 ci2-netbsd-2 getty[1222]: /dev/ttyE2: Device not configured
Warning: Permanently added '10.128.0.190' (ECDSA) to the list of known hosts.
2022/10/01 20:21:17 ignoring optional flag "sandboxArg"="0"
2022/10/01 20:21:17 parsed 1 programs
[  40.1654325] kqueue_register: syz-execprog[1226]: event type 0 not supported for file type 5/(null) (error 45)
[  40.1654325] kqueue_register: syz-execprog[1226]: event type 0 not supported for file type 5/(null) (error 45)
2022/10/01 20:21:18 executed programs: 0
2022/10/01 20:21:23 executed programs: 32
2022/10/01 20:21:28 executed programs: 67
2022/10/01 20:21:33 executed programs: 95
[  61.0454290] panic: kernel diagnostic assertion "mp->mnt_refcnt > 0 || mutex_owned(&mountlist_lock)" failed: file "/syzkaller/managers/ci2-netbsd/kernel/sys/kern/vfs_mount.c", line 292 
[  61.0654379] cpu1: Begin traceback...
[  61.0854151] vpanic() at netbsd:vpanic+0x282
[  61.1154157] _sub_D_65535_0() at netbsd:_sub_D_65535_0+-0x23de6
[  61.1454171] vfs_ref() at netbsd:vfs_ref+0x90
[  61.1754187] mount_domount() at netbsd:mount_domount+0x80e
[  61.2054174] do_sys_mount() at netbsd:do_sys_mount+0x7a1
[  61.2354183] compat_40_sys_mount() at netbsd:compat_40_sys_mount+0xbd
[  61.2654169] sys___syscall() at netbsd:sys___syscall+0x10e
[  61.3054185] syscall() at netbsd:syscall+0x25a
[  61.3154168] --- syscall (number 21 via SYS_syscall) ---
[  61.3254160] netbsd:syscall+0x25a:
[  61.3354162] cpu1: End traceback...
[  61.3354162] fatal breakpoint trap in supervisor mode
[  61.3454124] trap type 1 code 0 rip 0xffffffff8023230d cs 0x8 rflags 0x282 cr2 0x7d9a22deb0d8 ilevel 0 rsp 0xffffa382486c58e0
[  61.3554139] curlwp 0xffffa38013460940 pid 2281.2138 lowest kstack 0xffffa382486be2c0
Stopped in pid 2281.2138 (syz-executor.5) at    netbsd:breakpoint+0x5:  leave
?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0x105
vpanic() at netbsd:vpanic+0x282
_sub_D_65535_0() at netbsd:_sub_D_65535_0+-0x23de6
vfs_ref() at netbsd:vfs_ref+0x90
m