Ubuntu
qemu package

  1. Bug #1994002
  2. Comment #37

Comment 37 for bug 1994002

Revision history for this message
Mauricio Faria de Oliveira (mfo) wrote :

Verification done for focal-proposed.

focal-updates: FAIL (status: active)

 (qemu) info migrate
 ...
 Migration status: active
 total time: 0 milliseconds

focal-proposed: PASS (status: setup)

 (qemu) info migrate
 ...
 Migration status: setup
 total time: 0 milliseconds

Details:
=======

$ lsb_release -cs
focal

focal-updates: FAIL
-------------

$ curl http://ddebs.ubuntu.com/dbgsym-release-key.asc | sudo apt-key add -
$ sudo add-apt-repository -y 'deb http://ddebs.ubuntu.com/ubuntu focal-updates main'

$ sudo apt install --yes qemu-system-x86 qemu-system-x86-dbgsym

$ dpkg -s qemu-system-x86 | grep Version:
Version: 1:4.2-3ubuntu6.24

$ dpkg -s qemu-system-x86-dbgsym | grep Version:
Version: 1:4.2-3ubuntu6.24

...

$ sudo add-apt-repository -ys 'deb http://archive.ubuntu.com/ubuntu focal-updates main'

$ apt source qemu
$ head -n1 qemu-*/debian/changelog
qemu (1:4.2-3ubuntu6.24) focal-security; urgency=medium

$ vim qemu-*/migration/migration.c

 915 static void fill_source_migration_info(MigrationInfo *info)
...
 925 case MIGRATION_STATUS_SETUP:
 926 info->has_status = true;
 927 info->has_total_time = false;
 928 break;

...

T1)

$ qemu-system-x86_64 -nodefaults -nographic -S -incoming tcp:0:4444

T2)

gdb \
  -ex 'set non-stop on' -ex 'set pagination off' -ex 'set confirm off' \
  qemu-system-x86_64

(gdb) b migrate_set_state
Breakpoint 1 at 0x6d3aa0: migrate_set_state. (2 locations)

(gdb) b migration/migration.c:928
Breakpoint 2 at 0x6d317b: file ./migration/migration.c, line 928.

(gdb) run -nodefaults -nographic -S -monitor tcp:0:3333,server,wait=off

T3)

nc 127.0.0.1 3333

(qemu) migrate -d tcp:127.0.0.1:4444

T2)

Thread 1 "qemu-system-x86" hit Breakpoint 1, migrate_set_state (state=0x5555566949d8, old_state=0, new_state=1) at ./migration/migration.c:1463
1463 ./migration/migration.c: No such file or directory.
(gdb) p (MigrationStatus) 0
$1 = MIGRATION_STATUS_NONE
(gdb) p (MigrationStatus) 1
$2 = MIGRATION_STATUS_SETUP
(gdb) c

Thread 5 "qemu-system-x86" hit Breakpoint 1, migrate_set_state (state=0x5555566949d8, old_state=1, new_state=4) at ./migration/migration.c:1463
1463 in ./migration/migration.c
(gdb) p (MigrationStatus) 1
$3 = MIGRATION_STATUS_SETUP
(gdb) p (MigrationStatus) 4
$4 = MIGRATION_STATUS_ACTIVE
(gdb)

T3)

(qemu) info migrate

T2)

Thread 1 "qemu-system-x86" hit Breakpoint 2, fill_source_migration_info (info=0x555556850590) at ./migration/migration.c:928
928 in ./migration/migration.c

(gdb) p (MigrationStatus) s.state
$6 = MIGRATION_STATUS_SETUP
(gdb) p info.status
$7 = MIGRATION_STATUS_NONE

(gdb) info threads
  Id Target Id Frame
* 1 Thread 0x7ffff5ee55c0 (LWP 5066) "qemu-system-x86" fill_source_migration_info (info=0x555556850590) at ./migration/migration.c:928
  2 Thread 0x7ffff5ee1700 (LWP 5070) "qemu-system-x86" (running)
  3 Thread 0x7ffff565f700 (LWP 5071) "qemu-system-x86" (running)
  5 Thread 0x7fffedfff700 (LWP 5075) "qemu-system-x86" migrate_set_state (state=0x5555566949d8, old_state=1, new_state=4) at ./migration/migration.c:1463
(gdb) thread 5
[Switching to thread 5 (Thread 0x7fffedfff700 (LWP 5075))]
#0 migrate_set_state (state=0x5555566949d8, old_state=1, new_state=4) at ./migration/migration.c:1463
1463 in ./migration/migration.c

(gdb) continue &
Continuing.
(gdb) info threads
  Id Target Id Frame
  1 Thread 0x7ffff5ee55c0 (LWP 5066) "qemu-system-x86" fill_source_migration_info (info=0x555556850590) at ./migration/migration.c:928
  2 Thread 0x7ffff5ee1700 (LWP 5070) "qemu-system-x86" (running)
  3 Thread 0x7ffff565f700 (LWP 5071) "qemu-system-x86" (running)
* 5 Thread 0x7fffedfff700 (LWP 5075) "qemu-system-x86" (running)

(gdb) thread 1
[Switching to thread 1 (Thread 0x7ffff5ee55c0 (LWP 5066))]
#0 fill_source_migration_info (info=0x555556850590) at ./migration/migration.c:928
928 in ./migration/migration.c
(gdb) p (MigrationStatus) s.state
$8 = MIGRATION_STATUS_ACTIVE
(gdb) c

T3)

(qemu) info migrate
info migrate
globals:
store-global-state: on
only-migratable: off
send-configuration: on
send-section-footer: on
decompress-error-check: on
clear-bitmap-shift: 18
Migration status: active
total time: 0 milliseconds
(qemu)

Migration status is active, without any RAM statistics.

(qemu) quit
(gdb) quit

Terminal 1)

Ctrl-C

focal-proposed: PASS
--------------

$ sudo add-apt-repository -ys 'deb http://archive.ubuntu.com/ubuntu focal-proposed main'
$ sudo add-apt-repository -y 'deb http://ddebs.ubuntu.com/ubuntu focal-proposed main'

$ sudo apt install --yes qemu-system-x86 qemu-system-x86-dbgsym

$ dpkg -s qemu-system-x86 | grep Version:
Version: 1:4.2-3ubuntu6.25

$ dpkg -s qemu-system-x86-dbgsym | grep Version:
Version: 1:4.2-3ubuntu6.25

...

$ apt source qemu

$ head -n1 qemu-*/debian/changelog
qemu (1:4.2-3ubuntu6.25) focal; urgency=medium

$ vim qemu-*/migration/migration.c

 915 static void fill_source_migration_info(MigrationInfo *info)
...
 926 case MIGRATION_STATUS_SETUP:
 927 info->has_status = true;
 928 info->has_total_time = false;
 929 break;

...

T1)

$ qemu-system-x86_64 -nodefaults -nographic -S -incoming tcp:0:4444

T2)

gdb \
  -ex 'set non-stop on' -ex 'set pagination off' -ex 'set confirm off' \
  qemu-system-x86_64

(gdb) b migrate_set_state
Breakpoint 1 at 0x6d3b80: migrate_set_state. (2 locations)
(gdb) b migration/migration.c:928
Breakpoint 2 at 0x6d32ad: file ./migration/migration.c, line 928.

(gdb) run -nodefaults -nographic -S -monitor tcp:0:3333,server,wait=off

T3)

nc 127.0.0.1 3333

(qemu) migrate -d tcp:127.0.0.1:4444

T2)

Thread 1 "qemu-system-x86" hit Breakpoint 1, migrate_set_state (state=0x5555566949d8, old_state=0, new_state=1) at ./migration/migration.c:1464
1464 ./migration/migration.c: No such file or directory.
(gdb) p (MigrationStatus) 0
$1 = MIGRATION_STATUS_NONE
(gdb) p (MigrationStatus) 1
$2 = MIGRATION_STATUS_SETUP
(gdb) c
Continuing.
[New Thread 0x7fffedfff700 (LWP 6990)]
[New Thread 0x7fffed7fe700 (LWP 6991)]
[Thread 0x7fffedfff700 (LWP 6990) exited]

Thread 5 "qemu-system-x86" hit Breakpoint 1, migrate_set_state (state=0x5555566949d8, old_state=1, new_state=4) at ./migration/migration.c:1464
1464 in ./migration/migration.c
(gdb) p (MigrationStatus) 1
$3 = MIGRATION_STATUS_SETUP
(gdb) p (MigrationStatus) 4
$4 = MIGRATION_STATUS_ACTIVE
(gdb)

T3)

(qemu) info migrate

T2)

Thread 1 "qemu-system-x86" hit Breakpoint 2, fill_source_migration_info (info=0x555556850590) at ./migration/migration.c:928
928 in ./migration/migration.c

(gdb) p (MigrationStatus) s.state
$6 = MIGRATION_STATUS_SETUP
(gdb) p info.status
$7 = MIGRATION_STATUS_NONE

(gdb) info threads
  Id Target Id Frame
* 1 Thread 0x7ffff5ee55c0 (LWP 6983) "qemu-system-x86" fill_source_migration_info (info=0x555556850590) at ./migration/migration.c:928
  2 Thread 0x7ffff5ee1700 (LWP 6987) "qemu-system-x86" (running)
  3 Thread 0x7ffff565f700 (LWP 6988) "qemu-system-x86" (running)
  5 Thread 0x7fffed7fe700 (LWP 6991) "qemu-system-x86" migrate_set_state (state=0x5555566949d8, old_state=1, new_state=4) at ./migration/migration.c:1464
(gdb) thread 5
[Switching to thread 5 (Thread 0x7fffed7fe700 (LWP 6991))]
#0 migrate_set_state (state=0x5555566949d8, old_state=1, new_state=4) at ./migration/migration.c:1464
1464 in ./migration/migration.c

(gdb) continue &
Continuing.

(gdb) info threads
  Id Target Id Frame
  1 Thread 0x7ffff5ee55c0 (LWP 6983) "qemu-system-x86" fill_source_migration_info (info=0x555556850590) at ./migration/migration.c:928
  2 Thread 0x7ffff5ee1700 (LWP 6987) "qemu-system-x86" (running)
  3 Thread 0x7ffff565f700 (LWP 6988) "qemu-system-x86" (running)
* 5 Thread 0x7fffed7fe700 (LWP 6991) "qemu-system-x86" (running)
(gdb) thread 1
[Switching to thread 1 (Thread 0x7ffff5ee55c0 (LWP 6983))]
#0 fill_source_migration_info (info=0x555556850590) at ./migration/migration.c:928
928 in ./migration/migration.c
(gdb) p (MigrationStatus) s.state
$8 = MIGRATION_STATUS_ACTIVE
(gdb) c

T3)

(qemu) info migrate
info migrate
globals:
store-global-state: on
only-migratable: off
send-configuration: on
send-section-footer: on
decompress-error-check: on
clear-bitmap-shift: 18
Migration status: setup
total time: 0 milliseconds

Status is now still 'SETUP' (which is not expected to have RAM statistics), not 'ACTIVE' (which is, and caused the issue).

(qemu) quit
(gdb) quit

Terminal 1)

Ctrl-C