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What version of babeltrace are you using when running the tests? What distribution + version are you using? There is a fix for hangs that may occur during the test, which is included in stable-2.14 - https://github.com/lttng/lttng-tools/commit/55d3f5e528059267f44fb24b179b992bf2b0cfa6 I've been working on replacing the test. I'd be curious to know if you also see intermittent failures with the new version (e.g., is it a detail in the test harness, or is the issue elsewhere). https://review.lttng.org/c/lttng-tools/+/14959 thanks, kienan On 7/16/25 10:27 PM, Yu, Mingli wrote: > The more detail around the error as below. > > > [warning] [Context] Cannot open_trace of format lttng-live at path > net://localhost/host/qemux86-64/ggpndHBBanTXM3EY. > [warning] [Context] cannot open trace "net://localhost/host/qemux86-64/ > ggpndHBBanTXM3EY" for reading. > [error] opening trace "net://localhost/host/qemux86-64/ggpndHBBanTXM3EY" > for reading. > > [error] none of the specified trace paths could be opened. > > # Wait for viewer to exit > not ok 486 - Babeltrace succeeds > FAIL: tools/clear/test_ust 486 - Babeltrace succeeds > #   Failed test 'Babeltrace succeeds' > #   in ./tools/clear/test_ust:test_ust_streaming_live_viewer() at line 324. > > > Thanks, > Mingli > > On 7/14/25 17:37, Yu, Mingli via lttng-dev wrote: >> CAUTION: This email comes from a non Wind River email account! >> Do not click links or open attachments unless you recognize the sender >> and know the content is safe. >> >> Hi, >> >> The lttng-tools test fails as below, is there anyone meet the same issue >> and how to fix this?  Thanks! >> >> >> FAIL: tools/clear/test_ust 486 - Babeltrace succeeds >> [snip] >> FAIL: tools/clear/test_ust 706 - Babeltrace succeeds >> [snip] >> FAIL: tools/clear/test_ust >> [snip] >> # Wait for viewer to exit >> not ok 486 - Babeltrace succeeds >> FAIL: tools/clear/test_ust 486 - Babeltrace succeeds >> #   Failed test 'Babeltrace succeeds' >> #   in ./tools/clear/test_ust:test_ust_streaming_live_viewer() at line >> 324. >> [snip] >> # Wait for viewer to exit >> not ok 706 - Babeltrace succeeds >> FAIL: tools/clear/test_ust 706 - Babeltrace succeeds >> #   Failed test 'Babeltrace succeeds' >> #   in ./tools/clear/test_ust:test_ust_streaming_live_viewer() at line >> 324. >> >> >> Thanks, >> Mingli