Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is https://kernel.googlesource.com/pub/scm/linux/kernel/git/peterz/queue.git sched/wip-deadline commit d3138279c7f34b9e5b73cb77e7973e520afadf5e Author: Peter Zijlstra <peterz(a)infradead.org&gt; AuthorDate: Fri Jul 26 16:47:10 2019 +0200 Commit: Peter Zijlstra <peterz(a)infradead.org&gt; CommitDate: Tue Sep 3 14:08:54 2019 +0200 sched/fair: Add trivial fair server Signed-off-by: Peter Zijlstra (Intel) <peterz(a)infradead.org&gt; 8cc1142e1d sched/deadline: Introduce deadline servers d3138279c7 sched/fair: Add trivial fair server +-------------------------------------------------+------------+------------+ | | 8cc1142e1d | d3138279c7 | +-------------------------------------------------+------------+------------+ | boot_successes | 34 | 0 | | boot_failures | 7 | 4 | | invoked_oom-killer:gfp_mask=0x | 1 | | | Mem-Info | 1 | | | RIP:copy_user_generic_unrolled | 1 | | | BUG:kernel_hang_in_test_stage | 6 | | | WARNING:at_kernel/sched/sched.h:#start_dl_timer | 0 | 4 | | RIP:start_dl_timer | 0 | 4 | | kernel_BUG_at_kernel/sched/deadline.c | 0 | 1 | | invalid_opcode:#[##] | 0 | 1 | | RIP:enqueue_dl_entity | 0 | 1 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 1 | +-------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <lkp(a)intel.com&gt; [ 3.592399] Run /init as init process [ 3.598259] random: init: uninitialized urandom read (12 bytes read) [ 3.601457] init: Failed to spawn kernel-tests main process: unable to execute: No such file or directory [ 3.610818] ------------[ cut here ]------------ [ 3.612568] rq->clock_update_flags < RQCF_ACT_SKIP [ 3.612580] WARNING: CPU: 1 PID: 1470 at kernel/sched/sched.h:1118 start_dl_timer+0x74/0xce [ 3.617816] Modules linked in: [ 3.619221] CPU: 1 PID: 1470 Comm: plymouthd Not tainted 5.3.0-rc6-00322-gd3138279c7f34 #12 [ 3.622325] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 3.625447] RIP: 0010:start_dl_timer+0x74/0xce [ 3.627136] Code: e7 00 83 bd 48 0a 00 00 01 49 89 c5 77 1e 80 3d 9b 9e 81 01 00 75 15 48 c7 c7 38 a8 58 82 c6 05 8b 9e 81 01 01 e8 8a 4b fc ff <0f> 0b 4c 89 ee 48 2b b5 50 0a 00 00 31 c0 4c 01 e6 48 89 f2 4c 29 [ 3.633118] RSP: 0018:ffffc9000083fbd0 EFLAGS: 00010092 [ 3.634977] RAX: 0000000000000000 RBX: ffff88801e02a410 RCX: 0000000000000000 [ 3.637234] RDX: 00000000d75369f5 RSI: ffffffff82f581a6 RDI: ffffffff82f585a6 [ 3.639488] RBP: ffff88801e029b00 R08: ffffffff82f58180 R09: 0000000000000026 [ 3.641735] R10: ffffc900000138c0 R11: ffffc9000083f9e7 R12: 00000000dba3dddf [ 3.643995] R13: 00000000bc1eea59 R14: ffff8880089f8080 R15: ffff88801e129b80 [ 3.646246] FS: 00007fdf10cf1700(0000) GS:ffff88801e100000(0000) knlGS:0000000000000000 [ 3.649312] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.651279] CR2: 00007fdf10cf19d0 CR3: 000000001fa6e000 CR4: 00000000000006e0 [ 3.653539] Call Trace: [ 3.654827] update_curr_dl_se+0xf9/0x167 [ 3.656427] enqueue_task_fair+0x1ea/0x1310 [ 3.658056] ? select_task_rq_fair+0x90a/0x955 [ 3.659749] activate_task+0xa2/0xb0 [ 3.661241] ttwu_do_activate+0x48/0x62 [ 3.662823] try_to_wake_up+0x468/0x57d [ 3.664377] ? kmem_cache_alloc+0x4f/0x1d7 [ 3.665983] signal_wake_up_state+0x15/0x24 [ 3.667618] __send_signal+0x211/0x2f5 [ 3.669140] do_notify_parent_cldstop+0x158/0x18e [ 3.670885] ptrace_stop+0x12d/0x279 [ 3.672385] get_signal+0x237/0x7b2 [ 3.673864] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 3.675593] do_signal+0x36/0x54e [ 3.677029] ? retint_kernel+0x10/0x10 [ 3.678561] ? exit_to_usermode_loop+0x11/0xac [ 3.680246] exit_to_usermode_loop+0x37/0xac [ 3.681889] syscall_return_slowpath+0x98/0xc3 [ 3.683581] ret_from_fork+0x15/0x50 [ 3.685067] RIP: 0033:0x7fdf103ad126 [ 3.686559] Code: Bad RIP value. [ 3.687982] RSP: 002b:00007ffc3fe606d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 [ 3.690931] RAX: 0000000000000000 RBX: 00007ffc3fe606d0 RCX: 00007fdf103ad126 [ 3.693177] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 [ 3.695434] RBP: 00007ffc3fe60730 R08: 00000000000005bc R09: 00007fdf10cf1700 [ 3.697687] R10: 00007fdf10cf19d0 R11: 0000000000000246 R12: 0000000000000000 [ 3.699963] R13: 00000000000005bc R14: 0000000000000000 R15: 0000000000000000 [ 3.702222] ---[ end trace d32ced415a52aba9 ]--- [ 3.703962] ------------[ cut here ]------------ [ 3.703962] ------------[ cut here ]------------ [ 3.705683] kernel BUG at kernel/sched/deadline.c:1542! [ 3.707901] invalid opcode: 0000 [#1] SMP PTI [ 3.709569] CPU: 1 PID: 1470 Comm: plymouthd Tainted: G W 5.3.0-rc6-00322-gd3138279c7f34 #12 [ 3.713043] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 3.716176] RIP: 0010:enqueue_dl_entity+0x14/0x68d [ 3.717931] Code: 7e 4c 89 e6 48 89 df 5b 5d 41 5c 41 5d 41 5e 41 5f e9 df a1 fe ff 0f 1f 44 00 00 41 57 41 56 41 55 41 54 55 53 48 3b 3f 74 02 <0f> 0b 8a 47 54 41 89 d4 49 89 f5 48 89 fb a8 01 0f 85 c2 00 00 00 [ 3.723864] RSP: 0018:ffffc9000083fbc0 EFLAGS: 00010096 [ 3.725718] RAX: 0000000000000000 RBX: ffff88801e02a410 RCX: 0000000000000000 [ 3.727979] RDX: 0000000000000020 RSI: ffff88801e02a410 RDI: ffff88801e02a410 [ 3.730244] RBP: ffff88801e029b00 R08: ffffffff82f58180 R09: 0000000000000026 [ 3.732506] R10: ffffc900000138c0 R11: ffffc9000083f9e7 R12: 0000000000001f5e [ 3.734778] R13: ffff888010db8080 R14: ffff8880089f8080 R15: ffff88801e129b80 [ 3.737034] FS: 00007fdf10cf1700(0000) GS:ffff88801e100000(0000) knlGS:0000000000000000 [ 3.740115] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.742067] CR2: 00007fdf103ad0fc CR3: 000000001fa6e000 CR4: 00000000000006e0 [ 3.744332] Call Trace: [ 3.745586] update_curr_dl_se+0xef/0x167 [ 3.747189] enqueue_task_fair+0x1ea/0x1310 [ 3.748818] ? select_task_rq_fair+0x90a/0x955 [ 3.750489] activate_task+0xa2/0xb0 [ 3.751983] ttwu_do_activate+0x48/0x62 [ 3.753536] try_to_wake_up+0x468/0x57d [ 3.755097] ? kmem_cache_alloc+0x4f/0x1d7 [ 3.756703] signal_wake_up_state+0x15/0x24 [ 3.758323] __send_signal+0x211/0x2f5 [ 3.759866] do_notify_parent_cldstop+0x158/0x18e [ 3.761618] ptrace_stop+0x12d/0x279 [ 3.763121] get_signal+0x237/0x7b2 [ 3.764600] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 3.766314] do_signal+0x36/0x54e [ 3.767765] ? retint_kernel+0x10/0x10 [ 3.769299] ? exit_to_usermode_loop+0x11/0xac [ 3.770998] exit_to_usermode_loop+0x37/0xac [ 3.772643] syscall_return_slowpath+0x98/0xc3 [ 3.774324] ret_from_fork+0x15/0x50 [ 3.775827] RIP: 0033:0x7fdf103ad126 [ 3.777320] Code: Bad RIP value. [ 3.778743] RSP: 002b:00007ffc3fe606d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 [ 3.781687] RAX: 0000000000000000 RBX: 00007ffc3fe606d0 RCX: 00007fdf103ad126 [ 3.783945] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 [ 3.786198] RBP: 00007ffc3fe60730 R08: 00000000000005bc R09: 00007fdf10cf1700 [ 3.788456] R10: 00007fdf10cf19d0 R11: 0000000000000246 R12: 0000000000000000 [ 3.790720] R13: 00000000000005bc R14: 0000000000000000 R15: 0000000000000000 [ 3.792984] Modules linked in: [ 3.794362] ---[ end trace d32ced415a52abaa ]--- [ 3.796092] RIP: 0010:enqueue_dl_entity+0x14/0x68d # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD git bisect start 48a7b6cd8dc334d3270f1e1bfd083b4472c29861 089cf7f6ecb266b6a4164919a2e69bd2f938374a -- git bisect bad 478d1a1eaa32bd0a28fd804ce84656babf63d316 # 15:13 B 0 1 40 11 Merge 'peterz-queue/sched/wip-deadline' into devel-catchup-201909032046 git bisect good 146d2b5c2f4c559725f1ffa7539bb5531e7e5a20 # 17:56 G 10 0 1 2 Merge 'regulator/for-linus' into devel-catchup-201909032046 git bisect good c43b0cdf98bcae8fa9e80361c32610708d022c1f # 20:40 G 10 0 0 3 Merge 'regulator/for-next' into devel-catchup-201909032046 git bisect good 8f233983d97b3900c18f92a95559d4baadf0a790 # 23:23 G 10 0 1 2 Merge 'peterz-queue/x86/ftrace' into devel-catchup-201909032046 git bisect good 0f19a9f1dac32fa49dc30751c0ba0bf47b930792 # 02:19 G 11 0 0 1 Merge 'peterz-queue/x86/urgent' into devel-catchup-201909032046 git bisect good 5feeb7837a448f659e0aaa19fb446b1d9a4b323a # 05:07 G 10 0 0 0 sched: Fix kerneldoc comment for ia64_set_curr_task git bisect good 584a7e038264e7e0f6c72d0fc9f655bacf6d9f67 # 07:53 G 10 0 1 3 sched/core: uclamp: Propagate parent clamps git bisect good e8f1b861a1bbad0289a85ce8fbc83c6cd07e4a85 # 10:36 G 10 0 0 1 sched/deadline: Impose global limits on sched_attr::sched_period git bisect good 89ebcab7c48152b2077c7994349ea94a4def851e # 13:40 G 10 0 3 5 sched/deadline: Collect sched_dl_entity initialization git bisect good 8cc1142e1df9864731f1e6404930220b634e5393 # 16:42 G 10 0 0 4 sched/deadline: Introduce deadline servers git bisect bad d3138279c7f34b9e5b73cb77e7973e520afadf5e # 16:43 B 0 4 25 0 sched/fair: Add trivial fair server # first bad commit: [d3138279c7f34b9e5b73cb77e7973e520afadf5e] sched/fair: Add trivial fair server git bisect good 8cc1142e1df9864731f1e6404930220b634e5393 # 17:12 G 30 0 4 8 sched/deadline: Introduce deadline servers # extra tests on HEAD of linux-devel/devel-catchup-201909032046 git bisect bad 48a7b6cd8dc334d3270f1e1bfd083b4472c29861 # 17:13 B 0 337 362 6 0day head guard for 'devel-catchup-201909032046' # extra tests on tree/branch peterz-queue/sched/wip-deadline git bisect bad d3138279c7f34b9e5b73cb77e7973e520afadf5e # 17:16 B 0 4 25 0 sched/fair: Add trivial fair server # extra tests with first bad commit reverted git bisect good 9ac70448ec1810aa668f262a36f0bf6321e31bc9 # 20:26 G 10 0 0 2 Revert "sched/fair: Add trivial fair server" --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation