------------[ cut here ]------------
WARNING: CPU: 1 PID: 6891 at kernel/sched/core.c:2670 __ttwu_queue_wakelist kernel/sched/core.c:2613 [inline]
WARNING: CPU: 1 PID: 6891 at kernel/sched/core.c:2670 ttwu_queue_wakelist kernel/sched/core.c:2674 [inline]
WARNING: CPU: 1 PID: 6891 at kernel/sched/core.c:2670 ttwu_queue_wakelist+0x291/0x340 kernel/sched/core.c:2667
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 6891 Comm: syz-executor.5 Not tainted 5.9.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 panic+0x382/0x7fb kernel/panic.c:231
 __warn.cold+0x20/0x4b kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:ttwu_queue_wakelist kernel/sched/core.c:2670 [inline]
RIP: 0010:ttwu_queue_wakelist+0x291/0x340 kernel/sched/core.c:2667
Code: 0c 24 e9 80 fe ff ff 4c 89 04 24 e8 29 f7 65 00 4c 8b 04 24 e9 b1 fe ff ff e8 4b f7 65 00 e9 4c ff ff ff e8 81 f7 65 00 eb 89 <0f> 0b e9 9f fe ff ff 48 89 c6 48 c7 c7 a0 6a e2 89 48 89 04 24 e8
RSP: 0018:ffffc90000da8cd0 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffff8880ae720e20 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000010003 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff89a61908 R09: ffffffff8b34a67f
R10: fffffbfff16694cf R11: 0000000000000001 R12: 0000000000000001
R13: ffff88809ede2180 R14: 0000000000000001 R15: ffff8880ae700000
 ttwu_queue kernel/sched/core.c:2695 [inline]
 try_to_wake_up+0x51e/0x1350 kernel/sched/core.c:2978
 hrtimer_wakeup+0x43/0x60 kernel/time/hrtimer.c:1778
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x6a9/0xfc0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x147/0x5f0 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:wait_consider_task+0x35f/0x3b70 kernel/exit.c:1289
Code: 2e 00 41 83 fc 30 0f 84 58 10 00 00 e8 ca e7 2e 00 49 8d 7f 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e b5 2e 00 00 45 8b 6f 28 31 ff 44 89 ee e8
RSP: 0018:ffffc90005887b20 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814757e7
RDX: 1ffff11009f5506d RSI: ffffffff814757f6 RDI: ffff88804faa8368
RBP: ffffc90005887d24 R08: 0000000000000001 R09: ffffffff89c09083
R10: 0000000000000030 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000040000005 R14: 0000000040000000 R15: ffff88804faa8340
 do_wait_thread kernel/exit.c:1378 [inline]
 do_wait+0x376/0xa00 kernel/exit.c:1449
 kernel_wait4+0x14c/0x260 kernel/exit.c:1621
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1649
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x41723b
Code: 54 55 41 89 d4 53 48 89 f5 89 fb 48 83 ec 10 e8 1b f9 ff ff 45 31 d2 41 89 c0 49 63 d4 48 89 ee 48 63 fb b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 19 44 89 c7 89 44 24 0c e8 51 f9 ff ff 8b 44
RSP: 002b:00007fffe9ad4d00 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000041723b
RDX: 0000000040000001 RSI: 00007fffe9ad4d60 RDI: ffffffffffffffff
RBP: 00007fffe9ad4d60 R08: 0000000000000000 R09: 0000000002932940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000040000001
R13: 00007fffe9ad4d60 R14: 000000000011adc3 R15: 00007fffe9ad4d70

======================================================