Patch Detail

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{
    "id": 2197920,
    "url": "http://patchwork.ozlabs.org/api/1.0/patches/2197920/?format=api",
    "project": {
        "id": 14,
        "url": "http://patchwork.ozlabs.org/api/1.0/projects/14/?format=api",
        "name": "QEMU Development",
        "link_name": "qemu-devel",
        "list_id": "qemu-devel.nongnu.org",
        "list_email": "qemu-devel@nongnu.org",
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    },
    "msgid": "<20260218-colo_unit_test_multifd-v9-18-d8dbdb0ca6f6@web.de>",
    "date": "2026-02-18T21:29:38",
    "name": "[v9,18/19] multifd: Fix hang if send thread errors during sync",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "0c85d1fa339da871703a7d0ba37c9e7e01c32912",
    "submitter": {
        "id": 76468,
        "url": "http://patchwork.ozlabs.org/api/1.0/people/76468/?format=api",
        "name": "Lukas Straub",
        "email": "lukasstraub2@web.de"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260218-colo_unit_test_multifd-v9-18-d8dbdb0ca6f6@web.de/mbox/",
    "series": [
        {
            "id": 492617,
            "url": "http://patchwork.ozlabs.org/api/1.0/series/492617/?format=api",
            "date": "2026-02-18T21:29:37",
            "name": "migration: Add COLO multifd support and COLO migration unit test",
            "version": 9,
            "mbox": "http://patchwork.ozlabs.org/series/492617/mbox/"
        }
    ],
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2197920/checks/",
    "tags": {},
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        "From": "Lukas Straub <lukasstraub2@web.de>",
        "Date": "Wed, 18 Feb 2026 22:29:38 +0100",
        "Subject": "[PATCH v9 18/19] multifd: Fix hang if send thread errors during sync",
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        "Message-Id": "<20260218-colo_unit_test_multifd-v9-18-d8dbdb0ca6f6@web.de>",
        "References": "<20260218-colo_unit_test_multifd-v9-0-d8dbdb0ca6f6@web.de>",
        "In-Reply-To": "<20260218-colo_unit_test_multifd-v9-0-d8dbdb0ca6f6@web.de>",
        "To": "qemu-devel@nongnu.org",
        "Cc": "Peter Xu <peterx@redhat.com>, Fabiano Rosas <farosas@suse.de>,\n Laurent Vivier <lvivier@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>,\n Zhang Chen <zhangckid@gmail.com>,\n Hailiang Zhang <zhanghailiang@xfusion.com>,\n Markus Armbruster <armbru@redhat.com>, Li Zhijian <lizhijian@fujitsu.com>,\n \"Dr. David Alan Gilbert\" <dave@treblig.org>,\n Lukas Straub <lukasstraub2@web.de>",
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        "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org",
        "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"
    },
    "content": "When a send thread encounters an error (as is the case with yank),\nit sets multifd_send_state->exiting and the other threads exit too.\nThis races with multifd_send_sync_main() which now hangs at\nqemu_sem_wait(&p->sem_sync) in multifd_send_sync_main() line 647\nas it waits for threads that have exited.\n\nFix this by kicking the semaphores when exiting the send threads.\n\nI encountered this hang when stress testing the colo unit test,\nthough I was unable to write a migration test to reliably hit this.\n\nSigned-off-by: Lukas Straub <lukasstraub2@web.de>\n---\n migration/multifd.c | 1 +\n 1 file changed, 1 insertion(+)",
    "diff": "diff --git a/migration/multifd.c b/migration/multifd.c\nindex 220ed8564960fdabc58e4baa069dd252c8ad293c..e8c85cb6c48deaee2c9bda7b821a976166d78c9c 100644\n--- a/migration/multifd.c\n+++ b/migration/multifd.c\n@@ -677,6 +677,7 @@ static void *multifd_send_thread(void *opaque)\n         qemu_sem_wait(&p->sem);\n \n         if (multifd_send_should_exit()) {\n+            multifd_send_kick_main(p);\n             break;\n         }\n \n",
    "prefixes": [
        "v9",
        "18/19"
    ]
}