bisecting fixing commit since abdfd52a295fb5731ab07b5c9013e2e39f4d1cbe building syzkaller on 1656845f45f284c574eb4f8bfe85dd7916a47a3a testing commit abdfd52a295fb5731ab07b5c9013e2e39f4d1cbe with gcc (GCC) 8.1.0 kernel signature: 525e11c033c8320aaf043e36b5cb042e26077e0ef74445f730888ef73cc621ac all runs: crashed: WARNING in enqueue_task_dl testing current HEAD 1b5044021070efa3259f3e9548dc35d1eb6aa844 testing commit 1b5044021070efa3259f3e9548dc35d1eb6aa844 with gcc (GCC) 8.1.0 kernel signature: 9bfd0ee4e496bd6e4996e62122b35d479c5c9da0efdfad0d9b4a42dede3c2699 all runs: crashed: WARNING in enqueue_task_dl revisions tested: 2, total time: 19m33.334793939s (build: 11m32.845915039s, test: 7m18.772194032s) the crash still happens on HEAD commit msg: Merge tag 'dma-mapping-5.8-3' of git://git.infradead.org/users/hch/dma-mapping crash: WARNING in enqueue_task_dl ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7580 at kernel/sched/deadline.c:662 __enqueue_dl_entity kernel/sched/deadline.c:1414 [inline] WARNING: CPU: 0 PID: 7580 at kernel/sched/deadline.c:662 enqueue_dl_entity kernel/sched/deadline.c:1466 [inline] WARNING: CPU: 0 PID: 7580 at kernel/sched/deadline.c:662 enqueue_task_dl+0x1b61/0x2930 kernel/sched/deadline.c:1534 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7580 Comm: syz-executor.3 Not tainted 5.8.0-rc1-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+0x134/0x187 lib/dump_stack.c:118 panic+0x22a/0x4e3 kernel/panic.c:231 __warn.cold.12+0x25/0x27 kernel/panic.c:600 report_bug+0x1b5/0x260 lib/bug.c:198 exc_invalid_op+0x1be/0x370 arch/x86/kernel/traps.c:235 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563 RIP: 0010:setup_new_dl_entity kernel/sched/deadline.c:662 [inline] RIP: 0010:enqueue_dl_entity kernel/sched/deadline.c:1463 [inline] RIP: 0010:enqueue_task_dl+0x1b61/0x2930 kernel/sched/deadline.c:1534 Code: 89 45 c8 e8 b1 b7 52 00 b9 ff ff 37 00 4c 8b 4d a8 48 8b 55 b0 48 c1 e1 2a 4c 8b 5d b8 44 8b 55 c0 48 8b 45 c8 e9 b8 e7 ff ff <0f> 0b e9 0e f5 ff ff 0f 0b e9 73 f5 ff ff 48 89 d7 4c 89 4d b0 44 RSP: 0018:ffff888088cd7cb0 EFLAGS: 00010002 RAX: 0000000000000000 RBX: ffff8880a141a2c0 RCX: ffffffff898d5414 RDX: ffff8880a141a580 RSI: 0000000000000002 RDI: ffffffff88792920 RBP: ffff888088cd7d28 R08: 000000160d38a8a8 R09: 1ffffffff10f2524 R10: ffff8880aea36bdb R11: ffffed1015d46d7b R12: ffff8880a141a58c R13: ffff8880aea35d00 R14: ffff8880a141a538 R15: ffff8880aea35d00 enqueue_task+0xad/0x2c0 kernel/sched/core.c:1295 __sched_setscheduler+0xf03/0x2270 kernel/sched/core.c:5072 sched_setattr kernel/sched/core.c:5138 [inline] __do_sys_sched_setattr kernel/sched/core.c:5300 [inline] __se_sys_sched_setattr kernel/sched/core.c:5273 [inline] __x64_sys_sched_setattr+0x1c7/0x330 kernel/sched/core.c:5273 do_syscall_64+0x64/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x459819 Code: Bad RIP value. RSP: 002b:00007fae79eb1c78 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: 00007fae79eb26d4 R13: 00000000004c6d52 R14: 00000000004dc010 R15: 00000000ffffffff Kernel Offset: disabled