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Re: [Qemu-devel] [PATCH 1/3] migration: fix migrate_cancel leads live_mi
From: |
Juan Quintela |
Subject: |
Re: [Qemu-devel] [PATCH 1/3] migration: fix migrate_cancel leads live_migration thread endless loop |
Date: |
Wed, 24 Jul 2019 10:43:32 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux) |
Ivan Ren <address@hidden> wrote:
> When we 'migrate_cancel' a multifd migration, live_migration thread may
> go into endless loop in multifd_send_pages functions.
>
> Reproduce steps:
>
> (qemu) migrate_set_capability multifd on
> (qemu) migrate -d url
> (qemu) [wait a while]
> (qemu) migrate_cancel
>
> Then may get live_migration 100% cpu usage in following stack:
>
> pthread_mutex_lock
> qemu_mutex_lock_impl
> multifd_send_pages
> multifd_queue_page
> ram_save_multifd_page
> ram_save_target_page
> ram_save_host_page
> ram_find_and_save_block
> ram_find_and_save_block
> ram_save_iterate
> qemu_savevm_state_iterate
> migration_iteration_run
> migration_thread
> qemu_thread_start
> start_thread
> clone
>
> Signed-off-by: Ivan Ren <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>
Will sent for rc3.
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