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<412389f8-7d8f-414c-91f0-e748f370ad04@efficios.com> Date: Tue, 17 Mar 2026 11:06:50 -0400 User-Agent: Mozilla Thunderbird Subject: Re: linux-next: build failure after merge of the mm-nonmm-unstable tree To: Mark Brown , Andrew Morton , David Carlier , Josh Law Cc: Linux Kernel Mailing List , Linux Next Mailing List References: From: Mathieu Desnoyers Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: YQBPR0101CA0121.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:5::24) To YT2PR01MB9175.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:be::5) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: YT2PR01MB9175:EE_|YT2PR01MB11450:EE_ X-MS-Office365-Filtering-Correlation-Id: 8957d916-320e-4811-396d-08de8436d135 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: YT2PR01MB11450 On 2026-03-17 10:32, Mark Brown wrote: > Hi all, > > After merging the mm-unstable tree, today's linux-next build (arm64 > kunit) failed like this: > > [13:30:42] # hpcc_test_compare_value_boundaries: EXPECTATION FAILED at lib/tests/percpu_counter_tree_kunit.c:157 > [13:30:42] Expected 1 == percpu_counter_tree_precise_compare_value(&pct, (long)under), but > [13:30:42] percpu_counter_tree_precise_compare_value(&pct, (long)under) == 0 (0x0) > [13:30:42] # hpcc_test_compare_value_boundaries: EXPECTATION FAILED at lib/tests/percpu_counter_tree_kunit.c:160 > [13:30:42] Expected -1 == percpu_counter_tree_precise_compare_value(&pct, -(long)over), but > [13:30:42] percpu_counter_tree_precise_compare_value(&pct, -(long)over) == 0 (0x0) > [13:30:42] [FAILED] hpcc_test_compare_value_boundaries > [13:30:42] # hpcc_test_compare_counter_boundaries: EXPECTATION FAILED at lib/tests/percpu_counter_tree_kunit.c:246 > [13:30:42] Expected 1 == percpu_counter_tree_precise_compare(&pct[0], &pct[1]), but > [13:30:42] percpu_counter_tree_precise_compare(&pct[0], &pct[1]) == 0 (0x0) > [13:30:42] # hpcc_test_compare_counter_boundaries: EXPECTATION FAILED at lib/tests/percpu_counter_tree_kunit.c:251 > [13:30:42] Expected -1 == percpu_counter_tree_precise_compare(&pct[0], &pct[1]), but > [13:30:42] percpu_counter_tree_precise_compare(&pct[0], &pct[1]) == 0 (0x0) > [13:30:42] [FAILED] hpcc_test_compare_counter_boundaries > [13:30:42] [PASSED] hpcc_test_init_one > [13:30:42] [PASSED] hpcc_test_set > [13:30:42] # module: percpu_counter_tree_kunit > [13:30:42] # percpu_counter_tree: pass:8 fail:2 skip:0 total:10 > > ... > > [13:30:47] Testing complete. Ran 9088 tests: passed: 9015, failed: 2, skipped: 71 > [13:30:47] Failures: percpu_counter_tree.hpcc_test_compare_value_boundaries, percpu_counter_tree.hpcc_test_compare_counter_boundaries > > Triggered by commit > > ebc1ff504f557 (lib: add kunit boundary tests for percpu_counter_tree comparisons) > > though as it's a newly added test it's obviously entirely plausible that > it's flagging an existing bug. I used the tree from next-20260316 > instead. I've been able to reproduce with 1 cpu: branch: mm-unstable commit dffde584d805 ("zram: propagate read_from_bdev_async() errors") cat .kunit/.kunitconfig CONFIG_KUNIT=y CONFIG_SMP=y CONFIG_PREEMPT=y CONFIG_NR_CPUS=32 CONFIG_HOTPLUG_CPU=y CONFIG_PERCPU_COUNTER_TREE_TEST=y /tools/testing/kunit/kunit.py run --arch=x86_64 --qemu_args="-smp 1" [10:48:04] Configuring KUnit Kernel ... [10:48:04] Building KUnit Kernel ... Populating config with: $ make ARCH=x86_64 O=.kunit olddefconfig Building with: $ make all compile_commands.json scripts_gdb ARCH=x86_64 O=.kunit --jobs=384 [10:48:07] Starting KUnit Kernel (1/1)... [10:48:07] ============================================================ Running tests with: $ qemu-system-x86_64 -nodefaults -m 1024 -kernel .kunit/arch/x86/boot/bzImage -append 'kunit.enable=1 console=ttyS0 kunit_shutdown=reboot' -no-reboot -nographic -accel kvm -accel hvf -accel tcg -serial stdio -bios qboot.rom -smp 1 [10:48:08] ============ percpu_counter_tree (10 subtests) ============= [10:48:08] [PASSED] hpcc_print_info [10:48:15] [PASSED] hpcc_test_single_thread_first [10:48:19] [PASSED] hpcc_test_single_thread_first_random [10:48:19] [PASSED] hpcc_test_single_thread_random [10:48:34] [PASSED] hpcc_test_multi_thread_batch_increment [10:48:34] [PASSED] hpcc_test_multi_thread_random_walk [10:48:34] # hpcc_test_compare_value_boundaries: EXPECTATION FAILED at lib/tests/percpu_counter_tree_kunit.c:157 [10:48:34] Expected 1 == percpu_counter_tree_precise_compare_value(&pct, (long)under), but [10:48:34] percpu_counter_tree_precise_compare_value(&pct, (long)under) == 0 (0x0) [10:48:34] # hpcc_test_compare_value_boundaries: EXPECTATION FAILED at lib/tests/percpu_counter_tree_kunit.c:160 [10:48:34] Expected -1 == percpu_counter_tree_precise_compare_value(&pct, -(long)over), but [10:48:34] percpu_counter_tree_precise_compare_value(&pct, -(long)over) == 0 (0x0) [10:48:34] [FAILED] hpcc_test_compare_value_boundaries [10:48:34] # hpcc_test_compare_counter_boundaries: EXPECTATION FAILED at lib/tests/percpu_counter_tree_kunit.c:246 [10:48:34] Expected 1 == percpu_counter_tree_precise_compare(&pct[0], &pct[1]), but [10:48:34] percpu_counter_tree_precise_compare(&pct[0], &pct[1]) == 0 (0x0) [10:48:34] # hpcc_test_compare_counter_boundaries: EXPECTATION FAILED at lib/tests/percpu_counter_tree_kunit.c:251 [10:48:34] Expected -1 == percpu_counter_tree_precise_compare(&pct[0], &pct[1]), but [10:48:34] percpu_counter_tree_precise_compare(&pct[0], &pct[1]) == 0 (0x0) [10:48:34] [FAILED] hpcc_test_compare_counter_boundaries [10:48:34] [PASSED] hpcc_test_init_one [10:48:34] [PASSED] hpcc_test_set [10:48:34] # module: percpu_counter_tree_kunit [10:48:34] # percpu_counter_tree: pass:8 fail:2 skip:0 total:10 [10:48:34] # Totals: pass:8 fail:2 skip:0 total:10 [10:48:34] =============== [FAILED] percpu_counter_tree =============== [10:48:34] ============================================================ [10:48:34] Testing complete. Ran 10 tests: passed: 8, failed: 2 [10:48:34] Elapsed time: 30.726s total, 0.001s configuring, 3.074s building, 27.600s running Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com