bisecting fixing commit since 3bd837bfe431839a378e9d421af05b2e22a6d329 building syzkaller on 1656845f45f284c574eb4f8bfe85dd7916a47a3a testing commit 3bd837bfe431839a378e9d421af05b2e22a6d329 with gcc (GCC) 8.1.0 kernel signature: 181a8cb8965d12af540dc8bc5a529a69628540f91610d28e26449b2e807df070 all runs: crashed: WARNING in enqueue_task_dl testing current HEAD 6dd0e32665e591e9debe3edaf73c2f8135bf047e testing commit 6dd0e32665e591e9debe3edaf73c2f8135bf047e with gcc (GCC) 8.1.0 kernel signature: d6e7552a1553c2c03a02289471b927939cc54b034c115c686cfa3aad60de5f0c all runs: crashed: WARNING in enqueue_task_dl revisions tested: 2, total time: 24m6.182133543s (build: 17m24.329136692s, test: 5m59.429361724s) the crash still happens on HEAD commit msg: Linux 4.19.115 crash: WARNING in enqueue_task_dl IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth0_to_hsr: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7155 at kernel/sched/deadline.c:660 setup_new_dl_entity kernel/sched/deadline.c:660 [inline] WARNING: CPU: 0 PID: 7155 at kernel/sched/deadline.c:660 enqueue_dl_entity kernel/sched/deadline.c:1461 [inline] WARNING: CPU: 0 PID: 7155 at kernel/sched/deadline.c:660 enqueue_task_dl.cold.62+0x1c/0x1ea kernel/sched/deadline.c:1532 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7155 Comm: syz-executor.1 Not tainted 4.19.115-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x123/0x177 lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.8+0x1b/0x3e kernel/panic.c:541 report_bug+0x1a4/0x200 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037 RIP: 0010:setup_new_dl_entity kernel/sched/deadline.c:660 [inline] RIP: 0010:enqueue_dl_entity kernel/sched/deadline.c:1461 [inline] RIP: 0010:enqueue_task_dl.cold.62+0x1c/0x1ea kernel/sched/deadline.c:1532 Code: 0b 48 8b 4d 88 4c 8b 45 80 e9 33 33 ff ff 48 c7 c7 40 a9 ea 86 48 89 55 b0 4c 89 4d b8 4c 89 45 c0 48 89 4d d0 e8 55 23 05 00 <0f> 0b 4c 8b 4d b8 b8 ff ff 37 00 48 c1 e0 2a 48 8b 4d d0 4c 8b 45 RSP: 0018:ffff88809b14fcf0 EFLAGS: 00010086 RAX: 0000000000000024 RBX: ffff88809ab142c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff871f29a0 RDI: ffffffff89c876a0 RBP: ffff88809b14fd68 R08: ffffed1015d45079 R09: ffffed1015d45078 R10: ffffed1015d45078 R11: ffff8880aea283c7 R12: ffff88809ab1458c R13: ffffffff884ed460 R14: ffff8880aea2c240 R15: 0000000000000000 enqueue_task kernel/sched/core.c:728 [inline] __sched_setscheduler+0xd92/0x1f50 kernel/sched/core.c:4379 sched_setattr kernel/sched/core.c:4437 [inline] __do_sys_sched_setattr kernel/sched/core.c:4613 [inline] __se_sys_sched_setattr kernel/sched/core.c:4592 [inline] __x64_sys_sched_setattr+0x17e/0x2a0 kernel/sched/core.c:4592 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe63d3ddc78 EFLAGS: 00000246 ORIG_RAX: 000000000000013a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459819 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe63d3de6d4 R13: 00000000004c6d52 R14: 00000000004dc010 R15: 00000000ffffffff ======================================================