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Date: Mon, 4 Mar 2024 10:12:23 -0800 From: Guenter Roeck <linux@...ck-us.net> To: Marco Elver <elver@...gle.com> Cc: Peter Zijlstra <peterz@...radead.org>, Dmitry Vyukov <dvyukov@...gle.com>, linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org Subject: hw_breakpoint unit test failures with various architectures/platforms in qemu Hi, I see a number of failures and tracebacks when running the hw_breakpoint unit tests on various architectures in qemu. Some examples are below. Is this a potential problem with the unit tests, with the hardware, or with the qemu emulation of that hardware ? In other words, is it worthwhile to look into this further, or would it make more sense to just disable those tests if they fail on a given hardware/platform ? Thanks, Guenter --- arm:smdkc210: [ 9.515572] ok 2 test_many_cpus [ 9.519425] ########### searching unregister_test_bp [ 9.519989] ------------[ cut here ]------------ [ 9.520995] ########### searching test_one_task_on_all_cpus [ 9.521318] WARNING: CPU: 1 PID: 63 at kernel/events/hw_breakpoint_test.c:49 test_one_task_on_all_cpus+0x90/0x1c4 [ 9.521921] Modules linked in: [ 9.522532] CPU: 1 PID: 63 Comm: kunit_try_catch Tainted: G N 6.8.0-rc7-00028-g624465c9abd6 #1 [ 9.523102] Hardware name: Samsung Exynos (Flattened Device Tree) [ 9.523610] unwind_backtrace from show_stack+0x10/0x14 [ 9.523936] show_stack from dump_stack_lvl+0x68/0x90 [ 9.524191] dump_stack_lvl from __warn+0xbc/0x21c [ 9.524429] __warn from warn_slowpath_fmt+0x1a8/0x1b0 [ 9.524674] warn_slowpath_fmt from test_one_task_on_all_cpus+0x90/0x1c4 [ 9.524971] test_one_task_on_all_cpus from kunit_try_run_case+0x58/0x18c [ 9.525273] kunit_try_run_case from kunit_generic_run_threadfn_adapter+0x14/0x20 [ 9.525593] kunit_generic_run_threadfn_adapter from kthread+0x118/0x124 [ 9.525889] kthread from ret_from_fork+0x14/0x28 [ 9.526200] Exception stack(0xf0ad5fb0 to 0xf0ad5ff8) [ 9.526663] 5fa0: 00000000 00000000 00000000 00000000 [ 9.527112] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 9.527449] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 [ 9.527876] irq event stamp: 113 [ 9.528088] hardirqs last enabled at (121): [<c01adfb4>] console_unlock+0x114/0x130 [ 9.529049] hardirqs last disabled at (140): [<c01adfa0>] console_unlock+0x100/0x130 [ 9.529501] softirqs last enabled at (138): [<c010168c>] __do_softirq+0x340/0x520 [ 9.529892] softirqs last disabled at (129): [<c012f23c>] irq_exit+0x190/0x1c0 [ 9.530227] ---[ end trace 0000000000000000 ]--- [ 9.531752] # test_one_task_on_all_cpus: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 9.531752] Expected IS_ERR(bp) to be false, but is true [ 9.537757] not ok 3 test_one_task_on_all_cpus --- arm:raspi2b (and others): [ 14.718608] # Subtest: hw_breakpoint [ 14.719351] # module: hw_breakpoint_test [ 14.722275] 1..9 [ 14.737927] # test_one_cpu: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 14.737927] Expected IS_ERR(bp) to be false, but is true [ 14.745960] not ok 1 test_one_cpu [ 14.750052] # test_many_cpus: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 14.750052] Expected IS_ERR(bp) to be false, but is true [ 14.791453] not ok 2 test_many_cpus [ 14.805964] # test_one_task_on_all_cpus: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 14.805964] Expected IS_ERR(bp) to be false, but is true [ 14.822662] not ok 3 test_one_task_on_all_cpus [ 14.836897] # test_two_tasks_on_all_cpus: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 14.836897] Expected IS_ERR(bp) to be false, but is true [ 14.869770] not ok 4 test_two_tasks_on_all_cpus [ 14.913412] # test_one_task_on_one_cpu: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 14.913412] Expected IS_ERR(bp) to be false, but is true [ 14.929852] not ok 5 test_one_task_on_one_cpu [ 14.939676] # test_one_task_mixed: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 14.939676] Expected IS_ERR(bp) to be false, but is true [ 14.953670] not ok 6 test_one_task_mixed [ 14.964403] # test_two_tasks_on_one_cpu: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 14.964403] Expected IS_ERR(bp) to be false, but is true [ 14.997262] not ok 7 test_two_tasks_on_one_cpu [ 15.012825] # test_two_tasks_on_one_all_cpus: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 15.012825] Expected IS_ERR(bp) to be false, but is true [ 15.045472] not ok 8 test_two_tasks_on_one_all_cpus [ 15.070033] # test_task_on_all_and_one_cpu: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 15.070033] Expected IS_ERR(bp) to be false, but is true [ 15.077092] not ok 9 test_task_on_all_and_one_cpu --- arm64:virt: [ 7.753199] ok 2 test_many_cpus [ 7.766356] # test_one_task_on_all_cpus: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 7.766356] Expected IS_ERR(bp) to be false, but is true [ 7.775897] not ok 3 test_one_task_on_all_cpus [ 7.786604] # test_two_tasks_on_all_cpus: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 7.786604] Expected IS_ERR(bp) to be false, but is true [ 7.793878] not ok 4 test_two_tasks_on_all_cpus [ 7.799954] # test_one_task_on_one_cpu: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 7.799954] Expected IS_ERR(bp) to be false, but is true [ 7.811446] not ok 5 test_one_task_on_one_cpu [ 7.823706] # test_one_task_mixed: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 7.823706] Expected IS_ERR(bp) to be false, but is true [ 7.838892] not ok 6 test_one_task_mixed [ 7.843594] # test_two_tasks_on_one_cpu: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 7.843594] Expected IS_ERR(bp) to be false, but is true [ 7.862087] not ok 7 test_two_tasks_on_one_cpu [ 7.869706] # test_two_tasks_on_one_all_cpus: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 7.869706] Expected IS_ERR(bp) to be false, but is true [ 7.874499] not ok 8 test_two_tasks_on_one_all_cpus [ 7.878321] # test_task_on_all_and_one_cpu: ASSERTION FAILED at kernel/events/hw_breakpoint_test.c:70 [ 7.878321] Expected IS_ERR(bp) to be false, but is true [ 7.894138] not ok 9 test_task_on_all_and_one_cpu [ 7.894501] # hw_breakpoint: pass:2 fail:7 skip:0 total:9 [ 7.894911] # Totals: pass:2 fail:7 skip:0 total:9 --- loongarch: [ 7.327439] ok 2 test_many_cpus [ 7.330144] ------------[ cut here ]------------ [ 7.330849] WARNING: CPU: 1 PID: 87 at kernel/events/hw_breakpoint_test.c:49 test_one_task_on_all_cpus+0x204/0x210
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