Patch Detail

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{
    "id": 2197923,
    "url": "http://patchwork.ozlabs.org/api/1.0/patches/2197923/?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",
        "web_url": "",
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        "webscm_url": ""
    },
    "msgid": "<20260218-colo_unit_test_multifd-v9-19-d8dbdb0ca6f6@web.de>",
    "date": "2026-02-18T21:29:39",
    "name": "[v9,19/19] colo: Fix a rare crash during shutdown",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "62fcf72b9ce67573fdd4c4fe760b5080b842d494",
    "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-v9-19-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/2197923/checks/",
    "tags": {},
    "headers": {
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        "From": "Lukas Straub <lukasstraub2@web.de>",
        "Date": "Wed, 18 Feb 2026 22:29:39 +0100",
        "Subject": "[PATCH v9 19/19] colo: Fix a rare crash during shutdown",
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        "Message-Id": "<20260218-colo_unit_test_multifd-v9-19-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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        "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>",
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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": "In the colo migration unit test, we shutdown all sockets with yank and\nthen stop qemu with SIGTERM. During shutdown migration_shutdown() calls\nmigration_cancel(). Now the colo thread frees s->rp_state.from_dst_file\nwhich races with migration_cancel() checking for NULL and potentially calling\nqemu_file_shutdown() on it.\n\nFix this by taking the s->qemu_file_lock.\n\nSigned-off-by: Lukas Straub <lukasstraub2@web.de>\n---\n migration/colo.c | 23 +++++++++++++++--------\n 1 file changed, 15 insertions(+), 8 deletions(-)",
    "diff": "diff --git a/migration/colo.c b/migration/colo.c\nindex ce02c71d8857d470be434bdf3a9cacad3baab0d5..180793fe3f25140fa10887acc3d87515ebf43ac9 100644\n--- a/migration/colo.c\n+++ b/migration/colo.c\n@@ -173,11 +173,13 @@ static void primary_vm_do_failover(void)\n      * The s->rp_state.from_dst_file and s->to_dst_file may use the\n      * same fd, but we still shutdown the fd for twice, it is harmless.\n      */\n-    if (s->to_dst_file) {\n-        qemu_file_shutdown(s->to_dst_file);\n-    }\n-    if (s->rp_state.from_dst_file) {\n-        qemu_file_shutdown(s->rp_state.from_dst_file);\n+    WITH_QEMU_LOCK_GUARD(&s->qemu_file_lock) {\n+        if (s->to_dst_file) {\n+            qemu_file_shutdown(s->to_dst_file);\n+        }\n+        if (s->rp_state.from_dst_file) {\n+            qemu_file_shutdown(s->rp_state.from_dst_file);\n+        }\n     }\n \n     old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,\n@@ -544,11 +546,14 @@ static void colo_process_checkpoint(MigrationState *s)\n \n     failover_init_state();\n \n+    qemu_mutex_lock(&s->qemu_file_lock);\n     s->rp_state.from_dst_file = qemu_file_get_return_path(s->to_dst_file);\n     if (!s->rp_state.from_dst_file) {\n+        qemu_mutex_unlock(&s->qemu_file_lock);\n         error_report(\"Open QEMUFile from_dst_file failed\");\n         goto out;\n     }\n+    qemu_mutex_unlock(&s->qemu_file_lock);\n \n     packets_compare_notifier.notify = colo_compare_notify_checkpoint;\n     colo_compare_register_notifier(&packets_compare_notifier);\n@@ -640,9 +645,11 @@ out:\n      * Or the failover BH may shutdown the wrong fd that\n      * re-used by other threads after we release here.\n      */\n-    if (s->rp_state.from_dst_file) {\n-        qemu_fclose(s->rp_state.from_dst_file);\n-        s->rp_state.from_dst_file = NULL;\n+    WITH_QEMU_LOCK_GUARD(&s->qemu_file_lock) {\n+        if (s->rp_state.from_dst_file) {\n+            qemu_fclose(s->rp_state.from_dst_file);\n+            s->rp_state.from_dst_file = NULL;\n+        }\n     }\n }\n \n",
    "prefixes": [
        "v9",
        "19/19"
    ]
}