in trying to build a vm image that runs core-updates, I run into this error

...
...
...
`/gnu/store/j92kxc1l8h879cc4ss1gbhsq73ddnbsg-libgpg-error-1.26/share/locale/ja/LC_MESSAGES/libgpg-error.mo'
->
`/fs/gnu/store/j92kxc1l8h879cc4ss1gbhsq73ddnbsg-libgpg-error-1.26/share/locale/ja/LC_MESSAGES/libgpg-error.mo'
`/gnu/store/j92kxc1l8h879cc4ss1gbhsq73ddnbsg-libgpg-error-1.26/share/locale/de/LC_MESSAGES/libgpg-error.mo'
->
`/fs/gnu/store/j92kxc1l8h879cc4ss1gbhsq73ddnbsg-libgpg-error-1.26/share/locale/de/LC_MESSAGES/libgpg-error.mo'
`/gnu/store/j92kxc1l8h879cc4ss1gbhsq73ddnbsg-libgpg-error-1.26/share/locale/pl/LC_MESSAGES/libgpg-error.mo'
->
`/fs/gnu/store/j92kxc1l8h879cc4ss1gbhsq73ddnbsg-libgpg-error-1.26/share/locale/pl/LC_MESSAGES/libgpg-error.mo'
ERROR: In procedure copy-file:
ERROR: In procedure copy-file: No space left on device

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
[  136.307896] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000000
[  136.307896]
[  136.309002] CPU: 0 PID: 1 Comm: init Not tainted 4.10.5-gnu #1
[  136.309722] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.10.1-0-g8891697-prebuilt.qemu-project.org 04/01/2014
[  136.311114] Call Trace:
[  136.311651]  dump_stack+0x63/0x90
[  136.312101]  panic+0xe4/0x22d
[  136.312491]  do_exit+0xb21/0xb30
[  136.312888]  ? wake_up_state+0x10/0x20
[  136.313279]  do_group_exit+0x43/0xb0
[  136.313674]  SyS_exit_group+0x14/0x20
[  136.314077]  entry_SYSCALL_64_fastpath+0x1e/0xad
[  136.314580] RIP: 0033:0x5e6b98
[  136.314973] RSP: 002b:00007ffc5ac95d78 EFLAGS: 00000246 ORIG_RAX:
00000000000000e7
[  136.316217] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
00000000005e6b98
[  136.317519] RDX: 0000000000000000 RSI: 000000000000003c RDI:
0000000000000000
[  136.318405] RBP: 00000000007ef4d0 R08: 00000000000000e7 R09:
ffffffffffffffc8
[  136.319211] R10: 0000000000000000 R11: 0000000000000246 R12:
00000000004cd850
[  136.320041] R13: 0000000000a7f020 R14: 0000000001c73e60 R15:
0000000000000001
[  136.321284] Kernel Offset: 0x27000000 from 0xffffffff81000000
(relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[  136.322758] ---[ end Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000000
[  136.322758]


I don't understand: is this happening in my host ? Or is this happening
inside the Qemu machine ?

On my host I run df -h and I get


~$ df -h
File system     Dim. Usati Dispon. Uso% Montato su
none            3,7G     0    3,7G   0% /dev
/dev/sda5        99G   25G     69G  27% /
/dev/sda1       269M   11M    241M   5% /boot
/dev/sda6       129G   15G    108G  12% /home

""Dispon" means available
Montato su -> Mounted on

So /tmp is in the root partiton ( /dev/sda5 ) and I'd say there's quite a
bit of space available

Where am I ?

Thanks