utils/livesync: intermittent test failure

See https://gitlab.freedesktop.org/fengalin/gst-plugins-rs/-/jobs/38067122

---- test_audio_singlesegment stdout ----
thread 'test_audio_singlesegment' panicked at 'assertion failed: `(left == right)`
  left: `96000`,
 right: `48000`: Bad offset', utils/livesync/tests/livesync.rs:171:5
stack backtrace:
   0:     0x55ea136f857a - std::backtrace_rs::backtrace::libunwind::trace::h595f06c70adcc478
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x55ea136f857a - std::backtrace_rs::backtrace::trace_unsynchronized::h177a0149c76cdde9
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x55ea136f857a - std::sys_common::backtrace::_print_fmt::hc0701fd2c3530c58
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x55ea136f857a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hd4cd115d8750fd6c
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x55ea1371c4fe - core::fmt::write::h93e2f5923c7eca08
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/fmt/mod.rs:1213:17
   5:     0x55ea136f5975 - std::io::Write::write_fmt::h9959f96ab67fa35c
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/io/mod.rs:1682:15
   6:     0x55ea136f8345 - std::sys_common::backtrace::_print::h1835ef8a8f9066da
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x55ea136f8345 - std::sys_common::backtrace::print::hcb5e6388b9235f41
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x55ea136fa13f - std::panicking::default_hook::{{closure}}::h9c084969ccf9a722
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panicking.rs:267:22
   9:     0x55ea136f9dff - std::panicking::default_hook::h68fa2ba3c3c6c12f
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panicking.rs:283:9
  10:     0x55ea136bb607 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h12a0781208308044
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/alloc/src/boxed.rs:2002:9
  11:     0x55ea136bb607 - test::test_main::{{closure}}::h7ad7ae943fdfb9b7
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/test/src/lib.rs:135:21
  12:     0x55ea136fa86a - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h4e6ced11e07d8b24
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/alloc/src/boxed.rs:2002:9
  13:     0x55ea136fa86a - std::panicking::rust_panic_with_hook::h8d5c434518ef298c
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panicking.rs:692:13
  14:     0x55ea136fa5e9 - std::panicking::begin_panic_handler::{{closure}}::hf33414f5dabf6faf
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panicking.rs:579:13
  15:     0x55ea136f8a2c - std::sys_common::backtrace::__rust_end_short_backtrace::hc50389427413bb75
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/sys_common/backtrace.rs:137:18
  16:     0x55ea136fa2f2 - rust_begin_unwind
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panicking.rs:575:5
  17:     0x55ea1362ec13 - core::panicking::panic_fmt::h2de7a7938f816de8
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/panicking.rs:64:14
  18:     0x55ea1362efd9 - core::panicking::assert_failed_inner::h3843cc94596771f9
  19:     0x55ea1362be7b - core::panicking::assert_failed::h301436cd6eaf8278
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/panicking.rs:212:5
  20:     0x55ea1362fa9b - livesync::assert_buf::haf57a538d001d714
                               at /builds/fengalin/gst-plugins-rs/utils/livesync/tests/livesync.rs:39:5
  21:     0x55ea1362fa9b - livesync::assert_crank_pull::h40d769f9dc04efbc
                               at /builds/fengalin/gst-plugins-rs/utils/livesync/tests/livesync.rs:63:5
  22:     0x55ea13630277 - livesync::test_livesync::h191edc5c11ac1b57
                               at /builds/fengalin/gst-plugins-rs/utils/livesync/tests/livesync.rs:171:5
  23:     0x55ea1362fda0 - livesync::test_audio::h6dcf948fe3d2a14a
                               at /builds/fengalin/gst-plugins-rs/utils/livesync/tests/livesync.rs:125:5
  24:     0x55ea1362f71e - livesync::test_audio_singlesegment::ha858f2ddab785db9
                               at /builds/fengalin/gst-plugins-rs/utils/livesync/tests/livesync.rs:79:5
  25:     0x55ea1362f71e - livesync::test_audio_singlesegment::{{closure}}::ha583b54e5ff6c413
                               at /builds/fengalin/gst-plugins-rs/utils/livesync/tests/livesync.rs:78:31
  26:     0x55ea1362f71e - core::ops::function::FnOnce::call_once::hadcf1432cb575015
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/ops/function.rs:250:5
  27:     0x55ea136c09cf - core::ops::function::FnOnce::call_once::h5b1ab081051ac2d3
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/ops/function.rs:250:5
  28:     0x55ea136c09cf - test::__rust_begin_short_backtrace::h0902cdf9b17ba060
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/test/src/lib.rs:656:18
  29:     0x55ea1369266c - test::run_test::{{closure}}::hc66856f071e0d4b5
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/test/src/lib.rs:647:30
  30:     0x55ea1369266c - core::ops::function::FnOnce::call_once{{vtable.shim}}::hfe8467ce5b66122f
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/ops/function.rs:250:5
  31:     0x55ea136bfa2a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6346cb5ef99d424d
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/alloc/src/boxed.rs:1988:9
  32:     0x55ea136bfa2a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hf405595759a815ec
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/panic/unwind_safe.rs:271:9
  33:     0x55ea136bfa2a - std::panicking::try::do_call::hbd504df9f6e6d606
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panicking.rs:483:40
  34:     0x55ea136bfa2a - std::panicking::try::h4fcf155df21db1e7
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panicking.rs:447:19
  35:     0x55ea136bfa2a - std::panic::catch_unwind::h4a3018fee09e7c4d
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panic.rs:140:14
  36:     0x55ea136bfa2a - test::run_test_in_process::h667c4ecb9c983a95
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/test/src/lib.rs:679:27
  37:     0x55ea136bfa2a - test::run_test::run_test_inner::{{closure}}::h690aa8210278754c
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/test/src/lib.rs:573:39
  38:     0x55ea1368cb81 - test::run_test::run_test_inner::{{closure}}::h6be3c1dde7c2ea52
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/test/src/lib.rs:600:37
  39:     0x55ea1368cb81 - std::sys_common::backtrace::__rust_begin_short_backtrace::h444f8e9def80f8c3
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/sys_common/backtrace.rs:121:18
  40:     0x55ea136922fb - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::hce8a8eb131e754e8
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/thread/mod.rs:558:17
  41:     0x55ea136922fb - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h165ba069286ffa15
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/panic/unwind_safe.rs:271:9
  42:     0x55ea136922fb - std::panicking::try::do_call::hf7f2bd9cbae9cb83
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panicking.rs:483:40
  43:     0x55ea136922fb - std::panicking::try::h73e30af22766724c
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panicking.rs:447:19
  44:     0x55ea136922fb - std::panic::catch_unwind::h371266288ddf26f1
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panic.rs:140:14
  45:     0x55ea136922fb - std::thread::Builder::spawn_unchecked_::{{closure}}::h72a18812a02d75ce
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/thread/mod.rs:557:30
  46:     0x55ea136922fb - core::ops::function::FnOnce::call_once{{vtable.shim}}::h12fb468c971a9b21
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/ops/function.rs:250:5
  47:     0x55ea136febf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h1c0f3664d7ced314
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/alloc/src/boxed.rs:1988:9
  48:     0x55ea136febf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h67647c21c6c4968a
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/alloc/src/boxed.rs:1988:9
  49:     0x55ea136febf3 - std::sys::unix::thread::Thread::new::thread_start::h355d348ba593a22c
                               at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/sys/unix/thread.rs:108:17
  50:     0x7f1285e7cfd4 - <unknown>
  51:     0x7f1285efd66c - <unknown>
  52:                0x0 - <unknown>

For future reference. The logs disappear after some days/weeks.

mentioned in merge request !1494 (merged)

added Unstable test label

mentioned in commit gdesmott/gst-plugins-rs@be67a052

mentioned in commit gdesmott/gst-plugins-rs@2629719b

This one is for @heftig

mentioned in commit slomo/gst-plugins-rs@31f84874

mentioned in commit slomo/gst-plugins-rs@fd922317

Exactly same with test_audio_nonsinglesegment

mentioned in commit 6556d31a

mentioned in commit slomo/gst-plugins-rs@3e981575

mentioned in commit slomo/gst-plugins-rs@40402f8e

mentioned in commit slomo/gst-plugins-rs@0015acbb

mentioned in commit slomo/gst-plugins-rs@4d787126

mentioned in commit slomo/gst-plugins-rs@8d0a623b

mentioned in commit slomo/gst-plugins-rs@78cfda04

mentioned in commit slomo/gst-plugins-rs@77e91e96