From: Lukas Straub <lukasstraub2@web.de>
To: Arun Menon <armenon@redhat.com>
Cc: qemu-devel@nongnu.org, Peter Xu <peterx@redhat.com>,
Fabiano Rosas <farosas@suse.de>, Zhang Chen <zhangckid@gmail.com>,
Hailiang Zhang <zhanghailiang@xfusion.com>,
Li Zhijian <lizhijian@fujitsu.com>
Subject: Re: [PATCH v11 13/21] migration-test: Add COLO migration unit test
Date: Tue, 10 Mar 2026 16:29:54 +0100 [thread overview]
Message-ID: <20260310162954.61da59f1@penguin> (raw)
In-Reply-To: <abAvHRJJewZOz-BW@fedora>
[-- Attachment #1: Type: text/plain, Size: 17867 bytes --]
On Tue, 10 Mar 2026 20:17:57 +0530
Arun Menon <armenon@redhat.com> wrote:
> Hi Lukas,
>
> On Mon, Mar 02, 2026 at 12:45:28PM +0100, Lukas Straub wrote:
> > Add a COLO migration test for COLO migration and failover.
> >
> > Reviewed-by: Fabiano Rosas <farosas@suse.de>
> > Tested-by: Fabiano Rosas <farosas@suse.de>
> > Reviewed-by: Peter Xu <peterx@redhat.com>
> > Signed-off-by: Lukas Straub <lukasstraub2@web.de>
> > ---
> > MAINTAINERS | 1 +
> > tests/qtest/meson.build | 7 +-
> > tests/qtest/migration-test.c | 1 +
> > tests/qtest/migration/colo-tests.c | 198 +++++++++++++++++++++++++++++++++++++
> > tests/qtest/migration/framework.h | 5 +
> > 5 files changed, 211 insertions(+), 1 deletion(-)
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index d2a1f4cc08223cb944b61e32a6d89e25bf82eacb..1b0ae10750036be00571b7104ad8426c071bb54c 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -3875,6 +3875,7 @@ F: migration/colo*
> > F: migration/multifd-colo.*
> > F: include/migration/colo.h
> > F: include/migration/failover.h
> > +F: tests/qtest/migration/colo-tests.c
> > F: docs/COLO-FT.txt
> >
> > COLO Proxy
> > diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
> > index 25fdbc798010b19e8ec9b6ab55e02d3fb5741398..6a46e2a767de12d978d910ddb6de175bce9810b8 100644
> > --- a/tests/qtest/meson.build
> > +++ b/tests/qtest/meson.build
> > @@ -374,6 +374,11 @@ if gnutls.found()
> > endif
> > endif
> >
> > +migration_colo_files = []
> > +if get_option('replication').allowed()
> > + migration_colo_files = [files('migration/colo-tests.c')]
> > +endif
> > +
> > qtests = {
> > 'aspeed_hace-test': files('aspeed-hace-utils.c', 'aspeed_hace-test.c'),
> > 'aspeed_smc-test': files('aspeed-smc-utils.c', 'aspeed_smc-test.c'),
> > @@ -385,7 +390,7 @@ qtests = {
> > 'migration/migration-util.c') + dbus_vmstate1,
> > 'erst-test': files('erst-test.c'),
> > 'ivshmem-test': [rt, '../../contrib/ivshmem-server/ivshmem-server.c'],
> > - 'migration-test': test_migration_files + migration_tls_files,
> > + 'migration-test': test_migration_files + migration_tls_files + migration_colo_files,
> > 'pxe-test': files('boot-sector.c'),
> > 'pnv-xive2-test': files('pnv-xive2-common.c', 'pnv-xive2-flush-sync.c',
> > 'pnv-xive2-nvpg_bar.c'),
> > diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
> > index 08936871741535c926eeac40a7d7c3f461c72fd0..e582f05c7dc2673dbd05a936df8feb6c964b5bbc 100644
> > --- a/tests/qtest/migration-test.c
> > +++ b/tests/qtest/migration-test.c
> > @@ -55,6 +55,7 @@ int main(int argc, char **argv)
> > migration_test_add_precopy(env);
> > migration_test_add_cpr(env);
> > migration_test_add_misc(env);
> > + migration_test_add_colo(env);
> >
> > ret = g_test_run();
> >
> > diff --git a/tests/qtest/migration/colo-tests.c b/tests/qtest/migration/colo-tests.c
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..598a1d3821ed0a90318732702027cebad47352fd
> > --- /dev/null
> > +++ b/tests/qtest/migration/colo-tests.c
> > @@ -0,0 +1,198 @@
> > +/*
> > + * SPDX-License-Identifier: GPL-2.0-or-later
> > + *
> > + * QTest testcases for COLO migration
> > + *
> > + * Copyright (c) 2025 Lukas Straub <lukasstraub2@web.de>
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> > + * See the COPYING file in the top-level directory.
> > + *
> > + */
> > +
> > +#include "qemu/osdep.h"
> > +#include "libqtest.h"
> > +#include "migration/framework.h"
> > +#include "migration/migration-qmp.h"
> > +#include "migration/migration-util.h"
> > +#include "qemu/module.h"
> > +
> > +static int test_colo_common(MigrateCommon *args,
> > + bool failover_during_checkpoint,
> > + bool primary_failover)
> > +{
> > + QTestState *from, *to;
> > + void *data_hook = NULL;
> > +
> > + /*
> > + * For the COLO test, both VMs will run in parallel. Thus both VMs want to
> > + * open the image read/write at the same time. Using read-only=on is not
> > + * possible here, because ide-hd does not support read-only backing image.
> > + *
> > + * So use -snapshot, where each qemu instance creates its own writable
> > + * snapshot internally while leaving the real image read-only.
> > + */
> > + args->start.opts_source = "-snapshot";
> > + args->start.opts_target = "-snapshot";
> > +
> > + /*
> > + * COLO migration code logs many errors when the migration socket
> > + * is shut down, these are expected so we hide them here.
> > + */
> > + args->start.hide_stderr = true;
> > +
> > + /*
> > + * Test with yank with out of band capability since that is how it is
> > + * used in production.
> > + */
> > + args->start.oob = true;
> > + args->start.caps[MIGRATION_CAPABILITY_X_COLO] = true;
> > +
> > + if (migrate_start(&from, &to, args->listen_uri, &args->start)) {
> > + return -1;
> > + }
> > +
> > + migrate_set_parameter_int(from, "x-checkpoint-delay", 300);
> > +
> > + if (args->start_hook) {
> > + data_hook = args->start_hook(from, to);
> > + }
> > +
> > + migrate_ensure_converge(from);
> > + wait_for_serial("src_serial");
> > +
> > + migrate_qmp(from, to, args->connect_uri, NULL, "{}");
> > +
> > + wait_for_migration_status(from, "colo", NULL);
> > + wait_for_resume(to, get_dst());
> > +
> > + wait_for_serial("src_serial");
> > + wait_for_serial("dest_serial");
> > +
> > + /* wait for 3 checkpoints */
> > + for (int i = 0; i < 3; i++) {
> > + qtest_qmp_eventwait(to, "RESUME");
> > + wait_for_serial("src_serial");
> > + wait_for_serial("dest_serial");
> > + }
> > +
> > + if (failover_during_checkpoint) {
> > + qtest_qmp_eventwait(to, "STOP");
> > + }
> > + if (primary_failover) {
> > + qtest_qmp_assert_success(from, "{'exec-oob': 'yank', 'id': 'yank-cmd', "
> > + "'arguments': {'instances':"
> > + "[{'type': 'migration'}]}}");
> > + qtest_qmp_assert_success(from, "{'execute': 'x-colo-lost-heartbeat'}");
> > + wait_for_serial("src_serial");
> > + } else {
> > + qtest_qmp_assert_success(to, "{'exec-oob': 'yank', 'id': 'yank-cmd', "
> > + "'arguments': {'instances':"
> > + "[{'type': 'migration'}]}}");
> > + qtest_qmp_assert_success(to, "{'execute': 'x-colo-lost-heartbeat'}");
> > + wait_for_serial("dest_serial");
> > + }
> > +
> > + if (args->end_hook) {
> > + args->end_hook(from, to, data_hook);
> > + }
> > +
> > + migrate_end(from, to, !primary_failover);
> > +
> > + return 0;
> > +}
> > +
> > +static void test_colo_plain_common(MigrateCommon *args,
> > + bool failover_during_checkpoint,
> > + bool primary_failover)
> > +{
> > + args->listen_uri = "tcp:127.0.0.1:0";
> > + test_colo_common(args, failover_during_checkpoint, primary_failover);
> > +}
> > +
> > +static void *hook_start_multifd(QTestState *from, QTestState *to)
> > +{
> > + return migrate_hook_start_precopy_tcp_multifd_common(from, to, "none");
> > +}
> > +
> > +static void test_colo_multifd_common(MigrateCommon *args,
> > + bool failover_during_checkpoint,
> > + bool primary_failover)
> > +{
> > + args->listen_uri = "defer";
> > + args->start_hook = hook_start_multifd;
> > + args->start.caps[MIGRATION_CAPABILITY_MULTIFD] = true;
> > + test_colo_common(args, failover_during_checkpoint, primary_failover);
> > +}
> > +
> > +static void test_colo_plain_primary_failover(char *name, MigrateCommon *args)
> > +{
> > + test_colo_plain_common(args, false, true);
> > +}
> > +
> > +static void test_colo_plain_secondary_failover(char *name, MigrateCommon *args)
> > +{
> > + test_colo_plain_common(args, false, false);
> > +}
> > +
> > +static void test_colo_multifd_primary_failover(char *name, MigrateCommon *args)
> > +{
> > + test_colo_multifd_common(args, false, true);
> > +}
> > +
> > +static void test_colo_multifd_secondary_failover(char *name,
> > + MigrateCommon *args)
> > +{
> > + test_colo_multifd_common(args, false, false);
> > +}
> > +
> > +static void test_colo_plain_primary_failover_checkpoint(char *name,
> > + MigrateCommon *args)
> > +{
> > + test_colo_plain_common(args, true, true);
> > +}
> > +
> > +static void test_colo_plain_secondary_failover_checkpoint(char *name,
> > + MigrateCommon *args)
> > +{
> > + test_colo_plain_common(args, true, false);
> > +}
> > +
> > +static void test_colo_multifd_primary_failover_checkpoint(char *name,
> > + MigrateCommon *args)
> > +{
> > + test_colo_multifd_common(args, true, true);
> > +}
> > +
> > +static void test_colo_multifd_secondary_failover_checkpoint(char *name,
> > + MigrateCommon *args)
> > +{
> > + test_colo_multifd_common(args, true, false);
> > +}
> > +
> > +void migration_test_add_colo(MigrationTestEnv *env)
> > +{
> > + if (!env->full_set) {
> > + return;
> > + }
> > +
> > + migration_test_add("/migration/colo/plain/primary_failover",
> > + test_colo_plain_primary_failover);
> > + migration_test_add("/migration/colo/plain/secondary_failover",
> > + test_colo_plain_secondary_failover);
> > +
> > + migration_test_add("/migration/colo/multifd/primary_failover",
> > + test_colo_multifd_primary_failover);
> > + migration_test_add("/migration/colo/multifd/secondary_failover",
> > + test_colo_multifd_secondary_failover);
> > +
> > + migration_test_add("/migration/colo/plain/primary_failover_checkpoint",
> > + test_colo_plain_primary_failover_checkpoint);
> > + migration_test_add("/migration/colo/plain/secondary_failover_checkpoint",
> > + test_colo_plain_secondary_failover_checkpoint);
> > +
> > + migration_test_add("/migration/colo/multifd/primary_failover_checkpoint",
> > + test_colo_multifd_primary_failover_checkpoint);
> > + migration_test_add("/migration/colo/multifd/secondary_failover_checkpoint",
> > + test_colo_multifd_secondary_failover_checkpoint);
> > +}
> > diff --git a/tests/qtest/migration/framework.h b/tests/qtest/migration/framework.h
> > index 40984d04930da2d181326d9f6a742bde49018103..80eef758932ce9c301ed6c0f6383d18756144870 100644
> > --- a/tests/qtest/migration/framework.h
> > +++ b/tests/qtest/migration/framework.h
> > @@ -264,5 +264,10 @@ void migration_test_add_file(MigrationTestEnv *env);
> > void migration_test_add_precopy(MigrationTestEnv *env);
> > void migration_test_add_cpr(MigrationTestEnv *env);
> > void migration_test_add_misc(MigrationTestEnv *env);
> > +#ifdef CONFIG_REPLICATION
> > +void migration_test_add_colo(MigrationTestEnv *env);
> > +#else
> > +static inline void migration_test_add_colo(MigrationTestEnv *env) {};
> > +#endif
> >
> > #endif /* TEST_FRAMEWORK_H */
> >
> > --
> > 2.39.5
> >
> >
>
> I was running the qtests locally, and I encountered a timeout error.
>
> Command run: mkdir -p build ; cd build ; make check-qtest-x86_64;
>
> Following is the output:
> ======
> 67/67 qtest+qtest-x86_64 - qemu:qtest-x86_64/migration-test TIMEOUT 480.05s killed by signal 15 SIGTERM
> >>> QTEST_QEMU_IMG=./qemu-img LD_LIBRARY_PATH=/home/arun/workdir/new/devel/upstream/qemu-priv/build/subprojects/slirp RUST_BACKTRACE=1 QTEST_QEMU_BINARY=./qemu-system-x86_64 UBSAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1:print_stacktrace=1 G_TEST_DBUS_DAEMON=/home/arun/workdir/new/devel/upstream/qemu-priv/tests/dbus-vmstate-daemon.sh ASAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1 PYTHON=/home/arun/workdir/new/devel/upstream/qemu-priv/build/pyvenv/bin/python3 MESON_TEST_ITERATION=1 MALLOC_PERTURB_=53 QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon MSAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1:print_stacktrace=1 /home/arun/workdir/new/devel/upstream/qemu-priv/build/tests/qtest/migration-test --tap -k --full
> stderr:
>
> TAP parsing error: Too few tests run (expected 52, got 47)
>
> Summary of Failures:
> 67/67 qtest+qtest-x86_64 - qemu:qtest-x86_64/migration-test TIMEOUT 480.05s killed by signal 15 SIGTERM
> Ok: 64
> Fail: 0
> Skipped: 2
> Timeout: 1
> ======
>
> It seems that the test runner is stuck waiting for some input.
> Following is the stack trace
> ======
> > ps afx
> 127267 pts/0 S+ 0:00 | | \_ make check-qtest-x86_64 -j8
> 128245 pts/0 S+ 0:01 | | \_ /home/arun/workdir/new/devel/upstream/qemu-priv/build/pyvenv/bin/python3 /home/arun/workdir
> 128276 ? Ssl 0:07 | | \_ /home/arun/workdir/new/devel/upstream/qemu-priv/build/tests/qtest/migration-test --tap
> 134107 ? Sl 0:20 | | \_ ./qemu-system-x86_64 -qtest unix:/tmp/qtest-128276.sock -qtest-log /dev/null -chard
> 134115 ? Sl 0:22 | | \_ ./qemu-system-x86_64 -qtest unix:/tmp/qtest-128276.sock -qtest-log /dev/null -chard
> 5610 pts/2 Ss 0:01 | \_ /usr/bin/bash
>
> ======
> gstack 128276
> Thread 2 (Thread 0x7fdd090716c0 (LWP 128279) "call_rcu"):
> #0 0x00007fdd0921434d in syscall () from /lib64/libc.so.6
> #1 0x0000557fd604563a in qemu_futex_wait (f=0x557fd60a0190 <rcu_call_ready_event>, val=4294967295) at /home/arun/workdir/new/devel/upstream/qemu-priv/include/qemu/futex.h:47
> #2 0x0000557fd604584e in qemu_event_wait (ev=0x557fd60a0190 <rcu_call_ready_event>) at ../util/event.c:162
> #3 0x0000557fd6045fde in call_rcu_thread (opaque=0x0) at ../util/rcu.c:304
> #4 0x0000557fd600e8fb in qemu_thread_start (args=0x557fd6beec70) at ../util/qemu-thread-posix.c:414
> #5 0x00007fdd09193464 in start_thread () from /lib64/libc.so.6
> #6 0x00007fdd092165ac in __clone3 () from /lib64/libc.so.6
>
> Thread 1 (Thread 0x7fdd09073240 (LWP 128276) "migration-test"):
> #0 0x00007fdd0919b982 in __syscall_cancel_arch () from /lib64/libc.so.6
> #1 0x00007fdd0918fc3c in __internal_syscall_cancel () from /lib64/libc.so.6
> #2 0x00007fdd091dfb62 in clock_nanosleep@GLIBC_2.2.5 () from /lib64/libc.so.6
> #3 0x00007fdd091ebb37 in nanosleep () from /lib64/libc.so.6
> #4 0x00007fdd0921613a in usleep () from /lib64/libc.so.6
> #5 0x0000557fd5fd99cd in wait_for_serial (side=0x557fd6065f08 "dest_serial") at ../tests/qtest/migration/framework.c:82
> #6 0x0000557fd5fe5865 in test_colo_common (args=0x557fd6bfdf50, failover_during_checkpoint=false, primary_failover=true) at ../tests/qtest/migration/colo-tests.c:66
60 migrate_qmp(from, to, args->connect_uri, NULL, "{}");
61
62 wait_for_migration_status(from, "colo", NULL);
63 wait_for_resume(to, get_dst());
64
65 wait_for_serial("src_serial");
66 wait_for_serial("dest_serial");
Interesting, so the secondary guest is stuck/crahsed after entering
colo state despite having resumed.
It works fine here on master. And before the merge I have looped the
colo tests for a whole day on my machine without any failures.
How often does this happen? What is the commit you are on, host, ASAN,
MSAN, UBSAN, configure options? With kvm or without?
Can you try the following and show me the log:
(cd build && QTEST_QEMU_IMG=./qemu-img QTEST_QEMU_BINARY=./qemu-system-x86_64 QTEST_LOG=- tests/qtest/migration-test --full -p /x86_64/migration/colo/plain)
> #7 0x0000557fd5fe5a0f in test_colo_plain_common (args=0x557fd6bfdf50, failover_during_checkpoint=false, primary_failover=true) at ../tests/qtest/migration/colo-tests.c:106
> #8 0x0000557fd5fe5ad7 in test_colo_plain_primary_failover (name=0x557fd6bfd050 "/migration/colo/plain/primary_failover", args=0x557fd6bfdf50) at ../tests/qtest/migration/colo-tests.c:126
> #9 0x0000557fd5fdeff8 in migration_test_wrapper (data=0x557fd6bfd320) at ../tests/qtest/migration/migration-util.c:258
> #10 0x00007fdd0947bf3e in g_test_run_suite_internal () from /lib64/libglib-2.0.so.0
> #11 0x00007fdd0947beb3 in g_test_run_suite_internal () from /lib64/libglib-2.0.so.0
> #12 0x00007fdd0947beb3 in g_test_run_suite_internal () from /lib64/libglib-2.0.so.0
> #13 0x00007fdd0947beb3 in g_test_run_suite_internal () from /lib64/libglib-2.0.so.0
> #14 0x00007fdd0947beb3 in g_test_run_suite_internal () from /lib64/libglib-2.0.so.0
> #15 0x00007fdd0947c46a in g_test_run_suite () from /lib64/libglib-2.0.so.0
> #16 0x00007fdd0947c500 in g_test_run () from /lib64/libglib-2.0.so.0
> #17 0x0000557fd5fd9490 in main (argc=1, argv=0x7fff33b51908) at ../tests/qtest/migration-test.c:60
>
>
> Is there something that I am missing? Can you please look into this?
>
>
> Regards,
> Arun Menon
>
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next prev parent reply other threads:[~2026-03-10 15:30 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-02 11:43 [PATCH v11 00/21] migration: Add COLO multifd support and COLO migration unit test Lukas Straub
2026-03-02 11:43 ` [PATCH v11 01/21] MAINTAINERS: Add myself as maintainer for COLO migration framework Lukas Straub
2026-03-02 11:43 ` [PATCH v11 02/21] MAINTAINERS: Remove Hailiang Zhang from " Lukas Straub
2026-03-10 11:33 ` Lukas Straub
2026-03-02 11:43 ` [PATCH v11 03/21] colo: Setup ram cache in normal migration path Lukas Straub
2026-03-02 11:43 ` [PATCH v11 04/21] colo: Replace migration_incoming_colo_enabled() with migrate_colo() Lukas Straub
2026-03-02 11:43 ` [PATCH v11 05/21] colo: Remove ENABLE_COLO savevm command and mark it as deprecated Lukas Straub
2026-03-02 11:43 ` [PATCH v11 06/21] ram: Remove colo special-casing Lukas Straub
2026-03-02 11:43 ` [PATCH v11 07/21] multifd: Move ram state receive into multifd_ram_state_recv() Lukas Straub
2026-03-02 11:43 ` [PATCH v11 08/21] multifd: Add COLO support Lukas Straub
2026-03-02 11:43 ` [PATCH v11 09/21] Call colo_release_ram_cache() after multifd threads terminate Lukas Straub
2026-03-02 11:45 ` [PATCH v11 10/21] colo: Fix crash during device vmstate load Lukas Straub
2026-03-02 11:45 ` [PATCH v11 11/21] colo: Hold the BQL while sending ram state Lukas Straub
2026-03-02 11:45 ` [PATCH v11 12/21] colo: Do not hold the BQL while receiving " Lukas Straub
2026-03-02 11:45 ` [PATCH v11 13/21] migration-test: Add COLO migration unit test Lukas Straub
2026-03-10 14:47 ` Arun Menon
2026-03-10 15:29 ` Lukas Straub [this message]
2026-03-10 17:42 ` Arun Menon
2026-03-19 22:40 ` Lukas Straub
2026-03-02 11:45 ` [PATCH v11 14/21] Convert colo main documentation to restructuredText Lukas Straub
2026-03-02 11:45 ` [PATCH v11 15/21] qemu-colo.rst: Miscellaneous changes Lukas Straub
2026-03-02 11:45 ` [PATCH v11 16/21] qemu-colo.rst: Add my copyright Lukas Straub
2026-03-02 11:45 ` [PATCH v11 17/21] qemu-colo.rst: Simplify the block replication setup Lukas Straub
2026-03-02 11:45 ` [PATCH v11 18/21] multifd: Fix hang if send thread errors during sync Lukas Straub
2026-03-02 11:45 ` [PATCH v11 19/21] colo: Use file lock in primary_vm_do_failover() Lukas Straub
2026-03-02 20:06 ` Peter Xu
2026-03-02 11:45 ` [PATCH v11 20/21] migration: Keep s->rp_state.from_dst_file open until migration ends Lukas Straub
2026-03-02 20:07 ` Peter Xu
2026-03-02 11:45 ` [PATCH v11 21/21] colo: Reuse the return path from migration on primary and secondary side Lukas Straub
2026-03-02 20:11 ` Peter Xu
2026-03-06 12:53 ` [PATCH v11 00/21] migration: Add COLO multifd support and COLO migration unit test Lukas Straub
2026-03-06 13:07 ` Fabiano Rosas
-- strict thread matches above, loose matches on Subject: below --
2026-03-02 10:19 Lukas Straub
2026-03-02 10:19 ` [PATCH v11 13/21] migration-test: Add " Lukas Straub
2026-03-02 10:13 [PATCH v11 00/21] migration: Add COLO multifd support and " Lukas Straub
2026-03-02 10:13 ` [PATCH v11 13/21] migration-test: Add " Lukas Straub
2026-03-01 21:37 [PATCH v11 00/21] migration: Add COLO multifd support and " Lukas Straub
2026-03-01 21:37 ` [PATCH v11 13/21] migration-test: Add " Lukas Straub
2026-03-01 19:16 [PATCH v11 00/21] migration: Add COLO multifd support and " Lukas Straub
2026-03-01 19:16 ` [PATCH v11 13/21] migration-test: Add " Lukas Straub
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