rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=100613, q=9)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295014033-4295003531), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g100613 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28696 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4955 [inline]
 __schedule+0x940/0x26f0 kernel/sched/core.c:6236
 schedule+0xd3/0x270 kernel/sched/core.c:6315
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1966
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2139
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 23842 Comm: syz-executor.3 Not tainted 5.15.0-rc3-next-20211001-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:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:458
 print_other_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:706 [inline]
 rcu_pending kernel/rcu/tree.c:3889 [inline]
 rcu_sched_clock_irq+0x2125/0x2200 kernel/rcu/tree.c:2608
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__orc_find+0x5b/0xf0 arch/x86/kernel/unwind_orc.c:50
Code: ff df 49 89 fe 48 89 fd eb 0c 48 8d 6b 04 49 89 de 49 39 ec 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 <48> d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 48 89
RSP: 0018:ffffc90017f673e8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff92002fece8e RCX: ffffffff8133ebe5
RDX: 0000000000000000 RSI: ffffffff8de8c88c RDI: ffffffff8d7b48fc
RBP: ffffffff8d7b48fc R08: ffffffff8de8c88c R09: ffffc90017f67558
R10: fffff52002feceb6 R11: 0000000000086089 R12: ffffffff8d7b48fc
R13: ffffffff8d7b48fc R14: ffffffff8d7b48fc R15: dffffc0000000000
 orc_find arch/x86/kernel/unwind_orc.c:173 [inline]
 unwind_next_frame+0x32a/0x1ce0 arch/x86/kernel/unwind_orc.c:443
 __unwind_start+0x51b/0x800 arch/x86/kernel/unwind_orc.c:699
 unwind_start arch/x86/include/asm/unwind.h:60 [inline]
 arch_stack_walk+0x5c/0xe0 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 ____kasan_kmalloc mm/kasan/common.c:472 [inline]
 __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522
 kmalloc include/linux/slab.h:592 [inline]
 tty_alloc_file drivers/tty/tty_io.c:187 [inline]
 tty_open+0x140/0x1000 drivers/tty/tty_io.c:2140
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4c8/0x11d0 fs/open.c:822
 do_open fs/namei.c:3428 [inline]
 path_openat+0x1c9a/0x2740 fs/namei.c:3561
 do_filp_open+0x1aa/0x400 fs/namei.c:3588
 do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
 do_sys_open fs/open.c:1216 [inline]
 __do_sys_openat fs/open.c:1232 [inline]
 __se_sys_openat fs/open.c:1227 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1227
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f49b7da48d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f49b531b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f49b7ea8f60 RCX: 00007f49b7da48d9
RDX: 0000000000000802 RSI: 0000000020000840 RDI: ffffffffffffff9c
RBP: 00007f49b7dfecb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff58b07c0f R14: 00007f49b531b300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	df 49 89             	fisttps -0x77(%rcx)
   3:	fe 48 89             	decb   -0x77(%rax)
   6:	fd                   	std
   7:	eb 0c                	jmp    0x15
   9:	48 8d 6b 04          	lea    0x4(%rbx),%rbp
   d:	49 89 de             	mov    %rbx,%r14
  10:	49 39 ec             	cmp    %rbp,%r12
  13:	72 4d                	jb     0x62
  15:	4c 89 e0             	mov    %r12,%rax
  18:	48 29 e8             	sub    %rbp,%rax
  1b:	48 89 c2             	mov    %rax,%rdx
  1e:	48 c1 e8 3f          	shr    $0x3f,%rax
  22:	48 c1 fa 02          	sar    $0x2,%rdx
  26:	48 01 d0             	add    %rdx,%rax
* 29:	48 d1 f8             	sar    %rax <-- trapping instruction
  2c:	48 8d 5c 85 00       	lea    0x0(%rbp,%rax,4),%rbx
  31:	48 89 d8             	mov    %rbx,%rax
  34:	48 c1 e8 03          	shr    $0x3,%rax
  38:	42 0f b6 14 38       	movzbl (%rax,%r15,1),%edx
  3d:	48                   	rex.W
  3e:	89                   	.byte 0x89