rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=933/1/0x4000000000000000 softirq=34796/34797 fqs=7 
	(t=10500 jiffies g=62809 q=307)
NMI backtrace for cpu 0
CPU: 0 PID: 10022 Comm: syz-executor.4 Not tainted 5.16.0-rc4-next-20211210-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:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x262/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:604 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
 rcu_pending kernel/rcu/tree.c:3922 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2620
 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+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:check_kcov_mode+0x1c/0x40 kernel/kcov.c:166
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc 65 8b 05 29 79 8a 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 <8b> 96 ac 15 00 00 85 d2 74 0b 8b 86 88 15 00 00 39 f8 0f 94 c0 c3
RSP: 0018:ffffc90000007c40 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 000000000abcc771 RCX: 0000068db8bac710
RDX: 0000000000000100 RSI: ffff8880406b3a80 RDI: 0000000000000003
RBP: 000000000112e0be R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff876b692f R11: 0000000000000000 R12: 0000000000002710
R13: 0000068db8bac710 R14: 0000000000000004 R15: 0000000000000000
 write_comp_data kernel/kcov.c:221 [inline]
 __sanitizer_cov_trace_cmp8+0x1d/0x70 kernel/kcov.c:267
 pie_calculate_probability+0x28f/0x7c0 net/sched/sch_pie.c:348
 fq_pie_timer+0x170/0x2a0 net/sched/sch_fq_pie.c:383
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 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:preempt_latency_start kernel/sched/core.c:5430 [inline]
RIP: 0010:preempt_latency_start kernel/sched/core.c:5425 [inline]
RIP: 0010:preempt_count_add+0x88/0x140 kernel/sched/core.c:5453
Code: ff 7f 39 c3 74 03 5b 5d c3 48 8b 5c 24 10 48 89 df e8 1c 0b 0d 00 85 c0 75 35 65 48 8b 2c 25 40 70 02 00 48 8d bd 60 14 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f
RSP: 0018:ffffc90004a3f5d8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff81340ab0 RCX: 1ffffffff209df18
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880406b4ee0
RBP: ffff8880406b3a80 R08: ffffffff8e1a7db4 R09: 0000000000000001
R10: fffff52000947ee4 R11: 000000000008808a R12: ffffc90004a3f710
R13: 0000000000000000 R14: ffffc90004a3f6c8 R15: 0000000000000dc0
 unwind_next_frame+0x120/0x1ce0 arch/x86/kernel/unwind_orc.c:428
 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:766 [inline]
 slab_alloc_node mm/slub.c:3231 [inline]
 slab_alloc mm/slub.c:3239 [inline]
 kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3244
 kmem_cache_zalloc include/linux/slab.h:705 [inline]
 __alloc_file+0x21/0x280 fs/file_table.c:132
 alloc_empty_file+0x6d/0x170 fs/file_table.c:181
 path_openat+0xe4/0x2940 fs/namei.c:3595
 do_filp_open+0x1aa/0x400 fs/namei.c:3636
 do_sys_openat2+0x16d/0x4d0 fs/open.c:1214
 do_sys_open fs/open.c:1230 [inline]
 __do_sys_openat fs/open.c:1246 [inline]
 __se_sys_openat fs/open.c:1241 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241
 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: 0033:0x7fda528f2e99
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:00007fda51268168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fda52a05f60 RCX: 00007fda528f2e99
RDX: 0000000000000002 RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007fda5294cff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe30fe50bf R14: 00007fda51268300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	cc                   	int3
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	cc                   	int3
   e:	65 8b 05 29 79 8a 7e 	mov    %gs:0x7e8a7929(%rip),%eax        # 0x7e8a793e
  15:	89 c2                	mov    %eax,%edx
  17:	81 e2 00 01 00 00    	and    $0x100,%edx
  1d:	a9 00 01 ff 00       	test   $0xff0100,%eax
  22:	74 10                	je     0x34
  24:	31 c0                	xor    %eax,%eax
  26:	85 d2                	test   %edx,%edx
  28:	74 15                	je     0x3f
* 2a:	8b 96 ac 15 00 00    	mov    0x15ac(%rsi),%edx <-- trapping instruction
  30:	85 d2                	test   %edx,%edx
  32:	74 0b                	je     0x3f
  34:	8b 86 88 15 00 00    	mov    0x1588(%rsi),%eax
  3a:	39 f8                	cmp    %edi,%eax
  3c:	0f 94 c0             	sete   %al
  3f:	c3                   	retq