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error: program: qemu-system-x86_64; error: Process crashed #1358

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YousefSaber opened this issue Feb 14, 2020 · 10 comments
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error: program: qemu-system-x86_64; error: Process crashed #1358

YousefSaber opened this issue Feb 14, 2020 · 10 comments
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@YousefSaber
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YousefSaber commented Feb 14, 2020 •
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Ubuntu 19.10
multipass 1.0.2

your app works very randomly sometimes it succeed to start the VM sometimes I got this error, what's the solution for this?

joseph@joseph-X541UJ:~$ sudo systemctl status snap.multipass.multipassd.service 
● snap.multipass.multipassd.service - Service for snap application multipass.multipassd
   Loaded: loaded (/etc/systemd/system/snap.multipass.multipassd.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2020-02-14 11:22:48 EET; 27s ago
 Main PID: 9695 (multipassd)
    Tasks: 12 (limit: 4915)
   Memory: 33.9M
   CGroup: /system.slice/snap.multipass.multipassd.service
           ├─9695 /snap/multipass/1597/bin/multipassd --verbosity debug --logger platform
           └─9741 /snap/multipass/1597/usr/sbin/dnsmasq --strict-order --bind-interfaces --pid-file=/var/snap/multipass/common/data/multipassd

Feb 14 11:22:49 joseph-X541UJ dnsmasq[9741]: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth 
Feb 14 11:22:49 joseph-X541UJ dnsmasq-dhcp[9741]: DHCP, IP range 10.226.208.2 -- 10.226.208.254, lease time infinite
Feb 14 11:22:49 joseph-X541UJ dnsmasq-dhcp[9741]: DHCP, sockets bound exclusively to interface mpqemubr0
Feb 14 11:22:49 joseph-X541UJ dnsmasq[9741]: using local addresses only for domain multipass
Feb 14 11:22:49 joseph-X541UJ dnsmasq[9741]: reading /etc/resolv.conf
Feb 14 11:22:49 joseph-X541UJ dnsmasq[9741]: using local addresses only for domain multipass
Feb 14 11:22:49 joseph-X541UJ dnsmasq[9741]: using nameserver 127.0.0.53#53
Feb 14 11:22:49 joseph-X541UJ dnsmasq[9741]: read /etc/hosts - 7 addresses
Feb 14 11:22:49 joseph-X541UJ dnsmasq-dhcp[9741]: read /var/snap/multipass/common/data/multipassd/network/dnsmasq.hosts
Feb 14 11:22:49 joseph-X541UJ multipassd[9695]: gRPC listening on unix:/var/snap/multipass/common/multipass_socket, SSL:on
joseph@joseph-X541UJ:~$ multipass start ubuntu 
start failed: The following errors occurred:                                    
ubuntu: timed out waiting for response
joseph@joseph-X541UJ:~$ multipass start ubuntu                                  
Starting ubuntu -[2020-02-14T11:25:26.308] [error] [ubuntu] process error occurred Crashed program: qemu-system-x86_64; error: Process crashed

 /[2020-02-14T11:25:26.309] [error] [ubuntu] error: program: qemu-system-x86_64; error: Process crashed

start failed: cannot connect to the multipass socket                            
Please ensure multipassd is running and '/var/snap/multipass/common/multipass_socket' is accessible
joseph@joseph-X541UJ:~$ sudo systemctl status snap.multipass.multipassd.service                                  
● snap.multipass.multipassd.service - Service for snap application multipass.multipassd
   Loaded: loaded (/etc/systemd/system/snap.multipass.multipassd.service; enabled; vendor preset: enabled)
   Active: deactivating (stop-sigterm) (Result: core-dump) since Fri 2020-02-14 11:25:26 EET; 2s ago
  Process: 9695 ExecStart=/usr/bin/snap run multipass.multipassd (code=dumped, signal=SEGV)
 Main PID: 9695 (code=dumped, signal=SEGV)
    Tasks: 1 (limit: 4915)
   Memory: 2.1M
   CGroup: /system.slice/snap.multipass.multipassd.service
           └─9741 /snap/multipass/1597/usr/sbin/dnsmasq --strict-order --bind-interfaces --pid-file=/var/snap/multipass/common/data/multipassd

Feb 14 11:25:26 joseph-X541UJ multipassd[9695]: error: program: qemu-system-x86_64; error: Process crashed
Feb 14 11:25:26 joseph-X541UJ multipassd[9695]: Removing AppArmor policy: 
                                                
                                                #include <tunables/global>
                                                profile multipass.ubuntu.qemu-system-x86_64 flags=(attach_disconnected) {
                                                  #include <abstractions/base>
                                                  #include <abstractions/consoles>
                                                  #include <abstractions/nameservice>
                                                
                                                  # required for reading disk images
                                                  capability dac_override,
                                                  capability dac_read_search,
                                                  capability chown,
                                                
                                                  # needed to drop privileges
                                                  capability setgid,
                                                  capability setuid,
                                                
                                                  network inet stream,
                                                  network inet6 stream,
                                                
                                                  # Allow multipassd send qemu signals
                                                  signal (receive) peer=snap.multipass.multipassd,
                                                
                                                  /dev/net/tun rw,

the output of journalctl -fu snap.multipass.multipassd.service

joseph@joseph-X541UJ:~$ journalctl -fu snap.multipass.multipassd.service
-- Logs begin at Sat 2019-11-30 07:50:29 EET. --
Feb 14 12:16:03 joseph-X541UJ multipassd[4929]: error: program: qemu-system-x86_64; error: Process crashed
Feb 14 12:16:03 joseph-X541UJ multipassd[4929]: Removing AppArmor policy: 
                                                
                                                #include <tunables/global>
                                                profile multipass.ubuntu.qemu-system-x86_64 flags=(attach_disconnected) {
                                                  #include <abstractions/base>
                                                  #include <abstractions/consoles>
                                                  #include <abstractions/nameservice>
                                                
                                                  # required for reading disk images
                                                  capability dac_override,
                                                  capability dac_read_search,
                                                  capability chown,
                                                
                                                  # needed to drop privileges
                                                  capability setgid,
                                                  capability setuid,
                                                
                                                  network inet stream,
                                                  network inet6 stream,
                                                
                                                  # Allow multipassd send qemu signals
                                                  signal (receive) peer=snap.multipass.multipassd,
                                                
                                                  /dev/net/tun rw,
                                                  /dev/kvm rw,
                                                  /dev/ptmx rw,
                                                  /dev/kqemu rw,
                                                  @{PROC}/*/status r,
                                                  # When qemu is signaled to terminate, it will read cmdline of signaling
                                                  # process for reporting purposes. Allowing read access to a process
                                                  # cmdline may leak sensitive information embedded in the cmdline.
                                                  @{PROC}/@{pid}/cmdline r,
                                                  # Per man(5) proc, the kernel enforces that a thread may
                                                  # only modify its comm value or those in its thread group.
                                                  owner @{PROC}/@{pid}/task/@{tid}/comm rw,
                                                  @{PROC}/sys/kernel/cap_last_cap r,
                                                  owner @{PROC}/*/auxv r,
                                                  @{PROC}/sys/vm/overcommit_memory r,
                                                
                                                  # access to firmware's etc (selectively chosen for multipass' usage)
                                                  /snap/multipass/1597/qemu/* r,
                                                
                                                  # for save and resume
                                                  /{usr/,}bin/dash rmix,
                                                  /{usr/,}bin/dd rmix,
                                                  /{usr/,}bin/cat rmix,
                                                
                                                  # for restore
                                                  /{usr/,}bin/bash rmix,
                                                
                                                  # for file-posix getting limits since 9103f1ce
                                                  /sys/devices/**/block/*/queue/max_segments r,
                                                
                                                  # for gathering information about available host resources
                                                  /sys/devices/system/cpu/ r,
                                                  /sys/devices/system/node/ r,
                                                  /sys/devices/system/node/node[0-9]*/meminfo r,
                                                  /sys/module/vhost/parameters/max_mem_regions r,
                                                
                                                  # binary and its libs
                                                  /snap/multipass/1597/usr/bin/qemu-system-x86_64 ixr,
                                                  /snap/multipass/1597/{,usr/}lib/{,@{multiarch}/}{,**/}*.so* rm,
                                                
                                                  # CLASSIC ONLY: need to specify required libs from core snap
                                                  /{,var/lib/snapd/}snap/core18/*/{,usr/}lib/@{multiarch}/{,**/}*.so* rm,
                                                
                                                  # Disk images
                                                  /var/snap/multipass/common/data/multipassd/vault/instances/ubuntu/ubuntu-18.04-server-cloudimg-amd64.img rwk,  # QCow2 filesystem image
                                                  /var/snap/multipass/common/data/multipassd/vault/instances/ubuntu/cloud-init-config.iso rk,   # cloud-init ISO
                                                }
Feb 14 12:16:03 joseph-X541UJ multipassd[4929]: Failed to remove AppArmor policy 
                                                #include <tunables/global>
                                                profile multipass.ubuntu.qemu-system-x86_64 flags=(attach_disconnected) {
                                                  #include <abstractions/base>
                                                  #include <abstractions/consoles>
                                                  #include <abstractions/nameservice>
                                                
                                                  # required for reading disk images
                                                  capability dac_override,
                                                  capability dac_read_search,
                                                  capability chown,
                                                
                                                  # needed to drop privileges
                                                  capability setgid,
                                                  capability setuid,
                                                
                                                  network inet stream,
                                                  network inet6 stream,
                                                
                                                  # Allow multipassd send qemu signals
                                                  signal (receive) peer=snap.multipass.multipassd,
                                                
                                                  /dev/net/tun rw,
                                                  /dev/kvm rw,
                                                  /dev/ptmx rw,
                                                  /dev/kqemu rw,
                                                  @{PROC}/*/status r,
                                                  # When qemu is signaled to terminate, it will read cmdline of signaling
                                                  # process for reporting purposes. Allowing read access to a process
                                                  # cmdline may leak sensitive information embedded in the cmdline.
                                                  @{PROC}/@{pid}/cmdline r,
                                                  # Per man(5) proc, the kernel enforces that a thread may
                                                  # only modify its comm value or those in its thread group.
                                                  owner @{PROC}/@{pid}/task/@{tid}/comm rw,
                                                  @{PROC}/sys/kernel/cap_last_cap r,
                                                  owner @{PROC}/*/auxv r,
                                                  @{PROC}/sys/vm/overcommit_memory r,
                                                
                                                  # access to firmware's etc (selectively chosen for multipass' usage)
                                                  /snap/multipass/1597/qemu/* r,
                                                
                                                  # for save and resume
                                                  /{usr/,}bin/dash rmix,
                                                  /{usr/,}bin/dd rmix,
                                                  /{usr/,}bin/cat rmix,
                                                
                                                  # for restore
                                                  /{usr/,}bin/bash rmix,
                                                
                                                  # for file-posix getting limits since 9103f1ce
                                                  /sys/devices/**/block/*/queue/max_segments r,
                                                
                                                  # for gathering information about available host resources
                                                  /sys/devices/system/cpu/ r,
                                                  /sys/devices/system/node/ r,
                                                  /sys/devices/system/node/node[0-9]*/meminfo r,
                                                  /sys/module/vhost/parameters/max_mem_regions r,
                                                
                                                  # binary and its libs
                                                  /snap/multipass/1597/usr/bin/qemu-system-x86_64 ixr,
                                                  /snap/multipass/1597/{,usr/}lib/{,@{multiarch}/}{,**/}*.so* rm,
                                                
                                                  # CLASSIC ONLY: need to specify required libs from core snap
                                                  /{,var/lib/snapd/}snap/core18/*/{,usr/}lib/@{multiarch}/{,**/}*.so* rm,
                                                
                                                  # Disk images
                                                  /var/snap/multipass/common/data/multipassd/vault/instances/ubuntu/ubuntu-18.04-server-cloudimg-amd64.img rwk,  # QCow2 filesystem image
                                                  /var/snap/multipass/common/data/multipassd/vault/instances/ubuntu/cloud-init-config.iso rk,   # cloud-init ISO
                                                }
                                                    : errno=254 ()
Feb 14 12:16:03 joseph-X541UJ multipassd[4929]: QObject::connect: invalid null parameter
Feb 14 12:16:03 joseph-X541UJ multipassd[4929]: QObject::connect: invalid null parameter
Feb 14 12:16:03 joseph-X541UJ multipassd[4929]: QObject::connect: invalid null parameter
Feb 14 12:16:03 joseph-X541UJ multipassd[4929]: QObject::connect: invalid null parameter
Feb 14 12:16:03 joseph-X541UJ multipassd[4929]: QObject::connect: invalid null parameter
Feb 14 12:16:03 joseph-X541UJ multipassd[4929]: QObject::connect: invalid null parameter
Feb 14 12:16:03 joseph-X541UJ systemd[1]: snap.multipass.multipassd.service: Main process exited, code=dumped, status=11/SEGV
Feb 14 12:16:33 joseph-X541UJ systemd[1]: snap.multipass.multipassd.service: State 'stop-sigterm' timed out. Killing.
Feb 14 12:16:33 joseph-X541UJ systemd[1]: snap.multipass.multipassd.service: Killing process 4973 (dnsmasq) with signal SIGKILL.
Feb 14 12:16:33 joseph-X541UJ systemd[1]: snap.multipass.multipassd.service: Failed with result 'core-dump'.
Feb 14 12:16:33 joseph-X541UJ systemd[1]: snap.multipass.multipassd.service: Service RestartSec=100ms expired, scheduling restart.
Feb 14 12:16:33 joseph-X541UJ systemd[1]: snap.multipass.multipassd.service: Scheduled restart job, restart counter is at 4.
Feb 14 12:16:33 joseph-X541UJ systemd[1]: Stopped Service for snap application multipass.multipassd.
Feb 14 12:16:33 joseph-X541UJ systemd[1]: Started Service for snap application multipass.multipassd.
Feb 14 12:16:33 joseph-X541UJ multipassd[5446]: Using AppArmor support
Feb 14 12:16:33 joseph-X541UJ multipassd[5446]: Loading AppArmor policy: 
                                                
                                                #include <tunables/global>
                                                profile multipass.dnsmasq flags=(attach_disconnected) {
                                                  #include <abstractions/base>
                                                  #include <abstractions/nameservice>
                                                
                                                  capability chown,
                                                  capability net_bind_service,
                                                  capability setgid,
                                                  capability setuid,
                                                  capability dac_override,
                                                  capability dac_read_search,
                                                  capability net_admin,         # for DHCP server
                                                  capability net_raw,           # for DHCP server ping checks
                                                  network inet raw,
                                                  network inet6 raw,
                                                
                                                  # Allow multipassd send dnsmasq signals
                                                  signal (receive) peer=snap.multipass.multipassd,
                                                
                                                  # access to iface mtu needed for Router Advertisement messages in IPv6
                                                  # Neighbor Discovery protocol (RFC 2461)
                                                  @{PROC}/sys/net/ipv6/conf/*/mtu r,
                                                
                                                  # binary and its libs
                                                  /snap/multipass/1597/usr/sbin/dnsmasq ixr,
                                                  /snap/multipass/1597/{usr/,}lib/@{multiarch}/{,**/}*.so* rm,
                                                
                                                  # CLASSIC ONLY: need to specify required libs from core snap
                                                  /{,var/lib/snapd/}snap/core18/*/{,usr/}lib/@{multiarch}/{,**/}*.so* rm,
                                                
                                                  /var/snap/multipass/common/data/multipassd/network/dnsmasq.leases rw,           # Leases file
                                                  /var/snap/multipass/common/data/multipassd/network/dnsmasq.hosts r,             # Hosts file
                                                
                                                  /var/snap/multipass/common/data/multipassd/network/dnsmasq.pid w,     # pid file
                                                }
Feb 14 12:16:33 joseph-X541UJ multipassd[5488]: Applying AppArmor policy: multipass.dnsmasq
Feb 14 12:16:33 joseph-X541UJ dnsmasq[5490]: started, version 2.79 cachesize 150
Feb 14 12:16:33 joseph-X541UJ dnsmasq[5490]: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth DNSSEC loop-detect inotify
Feb 14 12:16:33 joseph-X541UJ dnsmasq-dhcp[5490]: DHCP, IP range 10.226.208.2 -- 10.226.208.254, lease time infinite
Feb 14 12:16:33 joseph-X541UJ dnsmasq-dhcp[5490]: DHCP, sockets bound exclusively to interface mpqemubr0
Feb 14 12:16:33 joseph-X541UJ dnsmasq[5490]: using local addresses only for domain multipass
Feb 14 12:16:33 joseph-X541UJ dnsmasq[5490]: reading /etc/resolv.conf
Feb 14 12:16:33 joseph-X541UJ dnsmasq[5490]: using local addresses only for domain multipass
Feb 14 12:16:33 joseph-X541UJ dnsmasq[5490]: using nameserver 127.0.0.53#53
Feb 14 12:16:33 joseph-X541UJ dnsmasq[5490]: read /etc/hosts - 7 addresses
Feb 14 12:16:33 joseph-X541UJ dnsmasq-dhcp[5490]: read /var/snap/multipass/common/data/multipassd/network/dnsmasq.hosts
Feb 14 12:16:33 joseph-X541UJ multipassd[5446]: gRPC listening on unix:/var/snap/multipass/common/multipass_socket, SSL:on

info about my Ubuntu VM

joseph@joseph-X541UJ:~$ multipass info ubuntu 
Name:           ubuntu
State:          Suspended
IPv4:           --
Release:        --
Image hash:     ae2c9391b71a (Ubuntu 18.04 LTS)
Load:           --
Disk usage:     --
Memory usage:   --
@YousefSaber YousefSaber mentioned this issue Feb 14, 2020
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@Saviq
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Saviq commented Feb 14, 2020

Hi @YousefSaber, could you please attach the file created from journalctl -u snap.multipass* > multipass.log?

It's unclear from the excerpts what exactly is crashing and where.

@Saviq Saviq added the question label Feb 14, 2020
@YousefSaber
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YousefSaber commented Feb 14, 2020 •
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Hi @YousefSaber, could you please attach the file created from journalctl -u snap.multipass* > multipass.log?

It's unclear from the excerpts what exactly is crashing and where.

here's the output file generated from the command
joseph@joseph-X541UJ:~$ journalctl -u snap.multipass.multipassd.service > multipass.log

multipass.log

@Saviq
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Saviq commented Feb 14, 2020

OK so the problematic bit is this:

Feb 12 23:21:57 joseph-X541UJ dnsmasq-dhcp[1350]: DHCP packet received on mpqemubr0 which has no address
…
Feb 12 23:26:00 joseph-X541UJ dnsmasq[24487]: failed to create listening socket for 10.226.208.1: Cannot assign requested address

Somehow, the mpqemubr0 bridge that the instances connect to has lost its IP address. This first started a couple nights ago. Any idea how it could have happened?

This ultimately resulted in multipassd crashing:

Feb 12 23:25:29 joseph-X541UJ systemd[1]: snap.multipass.multipassd.service: Main process exited, code=dumped, status=11/SEGV

You then rebooted and things went back to normal.

You also hit #1304 - we have a fix for that in master. You could either refresh to edge (sudo snap refresh multipass --edge), or sudo apt install qemu-kvm as a workaround.

Thanks for bearing with us, let us know please if this fixed your current problem.

@YousefSaber
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YousefSaber commented Feb 14, 2020 •
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Somehow, the mpqemubr0 bridge that the instances connect to has lost its IP address. This first started a couple nights ago. Any idea how it could have happened?

@Saviq I don't know but I can give some hints and clues that may have lead to this, my computer loses its internet connection after recovering from sleep mode then I had to restart my network in order to establish my internet connection again

joseph@joseph-X541UJ:~$ nmcli networking off
joseph@joseph-X541UJ:~$ nmcli networking on

hint 2: I may have shut down my computer while the VM was running

I don't know exactly what causes this issue.

the last time my VM was running I was adding public keys from my host machine to my VM
I followed the steps in this link, and I was establishing ssh connections from my host to VM.

as for your solutions, none of them unfortunately worked.

first I installed qemu-kvm then restarted my multipass service before trying to start my ubuntu VM but didn't work ( I'll show sequence of commands without the output of each for simplicity )

joseph@joseph-X541UJ:~$ sudo apt install qemu-kvm 
joseph@joseph-X541UJ:~$ sudo systemctl restart snap.multipass.multipassd.service 
joseph@joseph-X541UJ:~$ multipass start ubuntu

the associated multipass2.log file is here

multipass2.log

then I updated to edge version of the app didn't also work

I followed also the above steps, here is the generated multipass.log3

multipass3.log

one more thing restarting my system no longer solves the problem

@Saviq Saviq added bug high high importance and removed question labels Feb 14, 2020
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Saviq commented Feb 14, 2020

Hi @YousefSaber, thanks for digging. I now have a reproducer for the crash (#1360) and we'll get it fixed, thanks!

In the mean time, to recover your instance:

snap stop multipass
<favourite_editor> /var/snap/multipass/common/data/multipassd/multipassd-vm-instances.json
# set "machine_type" to "pc-i440fx-bionic" for the broken instance
snap start multipass

I'm working on a programmatic fix for that, too.

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Saviq commented Feb 14, 2020

@YousefSaber I just put #1361 up, when @multipass-ci-bot publishes a build, you should be able to snap refresh --channel edge/pr1361 and your instance should be back up.

@YousefSaber
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YousefSaber commented Feb 14, 2020 •
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sudo apt install qemu-kvm
snap stop multipass
<favourite_editor> /var/snap/multipass/common/data/multipassd/multipassd-vm-instances.json
# set "machine_type" to "pc-i440fx-bionic" for the broken instance
snap start multipass

those commands solved the issue thanks a lot ( didn't need to restart my PC )

I'll switch to the new channel edge version of the app

@Saviq
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Saviq commented Feb 14, 2020

@YousefSaber you're better off on edge, since #1304 is your underlying problem, and it's fixed there already.

As for your networking issue, that's quite interesting, but indeed your nmcli commands, or maybe what causes them to be a requirement, is likely the original cause.

@Saviq
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Saviq commented Feb 14, 2020

I'm going to close this, then - please reopen if there's something more. I'll file a new issue to consider the network problem.

@Saviq Saviq closed this as completed Feb 14, 2020
This was referenced Feb 19, 2020
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@YousefSaber
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YousefSaber commented Jan 3, 2021 •
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@Saviq the issue has surfaced again

snap stop multipass
<favourite_editor> /var/snap/multipass/common/data/multipassd/multipassd-vm-instances.json
# set "machine_type" to "pc-i440fx-bionic" for the broken instance
snap start multipass

doesn't work

this time I'm running Ubuntu 20.10
Multipass version

joseph@joseph-X541UJ:~$ multipass --version
multipass  1.6.0-dev.243+gf2c175f7
multipassd 1.6.0-dev.243+gf2c175f7

the stable version doesn't work also

I can't reopen the issue you may want to reopen it.

joseph@joseph-X541UJ:~$ multipass start ubuntu 
start failed: The following errors occurred:                                    
ubuntu: timed out waiting for response
joseph@joseph-X541UJ:~$ multipass start ubuntu                                  
Starting ubuntu \[2021-01-03T11:38:15.811] [error] [ubuntu] Qemu failed to start: program: qemu-system-x86_64; error: Process operation timed out

start failed: failed to start qemu instance: program: qemu-system-x86_64; error: Process operation timed out

#1384
#540

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