rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=426/1/0x4000000000000000 softirq=17171/17172 fqs=4997 
	(t=10502 jiffies g=22157 q=729)
NMI backtrace for cpu 0
CPU: 0 PID: 12265 Comm: syz-executor.2 Not tainted 5.11.0-rc2-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:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 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+0x1f4/0x230 kernel/rcu/tree_stall.h:337
 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:643 [inline]
 rcu_pending kernel/rcu/tree.c:3751 [inline]
 rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580
 update_process_times+0x16d/0x200 kernel/time/timer.c:1782
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:unwind_next_frame+0x0/0x1f90 arch/x86/kernel/unwind_orc.c:418
Code: ff ff ff 48 89 df 48 89 04 24 e8 fb 9b 83 00 48 8b 04 24 eb bd 48 89 0c 24 e8 6c 9b 83 00 48 8b 0c 24 e9 72 ff ff ff 0f 1f 00 <48> b8 00 00 00 00 00 fc ff df 41 57 49 89 ff 41 56 41 55 41 54 55
RSP: 0018:ffffc90000007860 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff81616f80 RCX: 0000000000000000
RDX: 1ffff92000000f39 RSI: ffffffff8162c4c9 RDI: ffffc90000007868
RBP: ffffc900000078f0 R08: ffffffff8df6ef3e R09: 0000000000000001
R10: 0000000000082083 R11: 0000000000000001 R12: ffffc90000007920
R13: 0000000000000000 R14: ffff888070ce3780 R15: 0000000000000400
 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:401 [inline]
 ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429
 kasan_slab_alloc include/linux/kasan.h:205 [inline]
 slab_post_alloc_hook mm/slab.h:512 [inline]
 slab_alloc_node mm/slub.c:2891 [inline]
 __kmalloc_node_track_caller+0x1e0/0x3f0 mm/slub.c:4495
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xae/0x5a0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 nlmsg_new include/net/netlink.h:953 [inline]
 xfrm_exp_state_notify net/xfrm/xfrm_user.c:2867 [inline]
 xfrm_send_state_notify+0xd63/0x1ca0 net/xfrm/xfrm_user.c:3029
 km_state_notify+0xbf/0x1e0 net/xfrm/xfrm_state.c:2176
 km_state_expired net/xfrm/xfrm_state.c:2190 [inline]
 xfrm_timer_handler+0x844/0xbf0 net/xfrm/xfrm_state.c:600
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x609/0xe40 kernel/time/hrtimer.c:1583
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600
 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:unwind_next_frame+0x13e/0x1f90 arch/x86/kernel/unwind_orc.c:431
Code: 00 48 89 44 24 10 e8 01 a7 1b 00 4d 8d 77 50 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 db 15 00 00 <4d> 8b 6f 50 4d 85 ed 74 30 49 8d bd 88 00 00 00 48 b8 00 00 00 00
RSP: 0018:ffffc90008e7f628 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 1ffff920011cfecd RCX: 1ffffffff1e17acc
RDX: 1ffff920011cfeea RSI: 0000000000000000 RDI: ffff888070ce4b00
RBP: 0000000000000001 R08: ffffffff8d85850e R09: 0000000000000001
R10: 0000000000082083 R11: 0000000000000001 R12: ffffc90008e7f748
R13: 0000000000000000 R14: ffffc90008e7f750 R15: ffffc90008e7f700
 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356
 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362
 kasan_slab_free include/linux/kasan.h:188 [inline]
 slab_free_hook mm/slub.c:1547 [inline]
 slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580
 slab_free mm/slub.c:3142 [inline]
 kmem_cache_free+0x82/0x350 mm/slub.c:3158
 free_mm_slot mm/khugepaged.c:416 [inline]
 __khugepaged_exit+0x2b8/0x470 mm/khugepaged.c:533
 khugepaged_exit include/linux/khugepaged.h:52 [inline]
 __mmput+0x389/0x470 kernel/fork.c:1082
 mmput+0x53/0x60 kernel/fork.c:1104
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xb6a/0x2ae0 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x3e9/0x20a0 kernel/signal.c:2770
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: Unable to access opcode bytes at RIP 0x45e1ef.
RSP: 002b:00007fe63f231cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000119c030 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000119c030
RBP: 000000000119c028 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007fff481404ff R14: 00007fe63f2329c0 R15: 000000000119c034