rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
------------[ cut here ]------------
IRQs not enabled as expected
WARNING: CPU: 0 PID: 8798 at kernel/sched/core.c:2675 try_invoke_on_locked_down_task+0x2f3/0x3d0 kernel/sched/core.c:2675
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8798 Comm: syz-executor.2 Not tainted 5.8.0-rc1-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+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:try_invoke_on_locked_down_task+0x2f3/0x3d0 kernel/sched/core.c:2675
Code: ff d0 41 89 c7 e9 07 ff ff ff 80 3d 85 2b b1 08 00 0f 85 56 fe ff ff 48 c7 c7 00 6f ca 87 c6 05 71 2b b1 08 01 e8 6c 3a f5 ff <0f> 0b e9 3c fe ff ff 4c 89 85 60 ff ff ff 48 8b b5 68 ff ff ff 4c
RSP: 0018:ffffc90000007bf0 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 1ffff92000000f82 RCX: 0000000000000000
RDX: 0000000000010002 RSI: 0000000000000004 RDI: ffffffff8ae10220
RBP: ffffc90000007c98 R08: ffffed1015d441fa R09: ffffed1015d441fa
R10: ffff8880aea20fcb R11: ffffed1015d441f9 R12: ffff8880a1d32000
R13: ffffc90000007c70 R14: ffff8880a94d0140 R15: dffffc0000000000
 rcu_print_task_stall kernel/rcu/tree_stall.h:269 [inline]
 print_other_cpu_stall kernel/rcu/tree_stall.h:477 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:636 [inline]
 rcu_pending kernel/rcu/tree.c:3471 [inline]
 rcu_sched_clock_irq.cold.89+0x93f/0xd5e kernel/rcu/tree.c:2486
 update_process_times+0x23/0x50 kernel/time/timer.c:1726
 tick_sched_handle.isra.18+0x6b/0x130 kernel/time/tick-sched.c:176
 tick_sched_timer+0x48/0x100 kernel/time/tick-sched.c:1320
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x511/0xbf0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x2df/0x760 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x14a/0x5d0 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </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+0x198/0x200 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:kfree+0x237/0x2c0 mm/slab.c:3758
Code: 5e 7e 0f 85 22 fe ff ff e8 65 62 5d ff e9 18 fe ff ff e8 dc 49 cd ff 48 83 3d 34 51 71 07 00 0f 84 83 00 00 00 48 89 df 57 9d <0f> 1f 44 00 00 5b 41 5c 41 5d 41 5e 5d c3 e8 b6 49 cd ff 48 83 3d
RSP: 0018:ffffc9000212f848 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000286 RCX: 0000000000000000
RDX: 1ffff110143a6510 RSI: 0000000000000000 RDI: 0000000000000286
RBP: ffffc9000212f868 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888089aab580
R13: ffff8880aa4001c0 R14: ffffffff83a78f9a R15: 1ffff110129c6b76
 tty_free_file drivers/tty/tty_io.c:222 [inline]
 tty_open+0x34a/0xa00 drivers/tty/tty_io.c:2034
 chrdev_open+0x1ed/0x5c0 fs/char_dev.c:414
 do_dentry_open+0x438/0x1020 fs/open.c:828
 vfs_open+0x9a/0xc0 fs/open.c:942
 do_open fs/namei.c:3243 [inline]
 path_openat+0xe2a/0x2700 fs/namei.c:3360
 do_filp_open+0x171/0x240 fs/namei.c:3387
 do_sys_openat2+0x309/0x590 fs/open.c:1179
 do_sys_open+0x90/0xe0 fs/open.c:1195
 __do_sys_openat fs/open.c:1209 [inline]
 __se_sys_openat fs/open.c:1204 [inline]
 __x64_sys_openat+0x98/0xf0 fs/open.c:1204
 do_syscall_64+0x64/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45a909
Code: Bad RIP value.
RSP: 002b:00007f48c2ab7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a909
RDX: 0000000000000000 RSI: 0000000020000380 RDI: ffffffffffffff9c
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f48c2ab86d4
R13: 00000000004c8678 R14: 00000000004dfa28 R15: 00000000ffffffff
Kernel Offset: disabled