======================================
| [ 401.031095][ C2] #1: ffff888009b9d1c8 (&fc->bg_lock){+.+.}-{3:3}, at: fuse_request_queue_background (fs/fuse/dev.c:609) 
| [ 401.031556][ C2] #2: ffffc90000238d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [  401.031943][    C2]
| [  401.031943][    C2] stack backtrace:
[  401.032268][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  401.032270][    C2] Call Trace:
[  401.032273][    C2]  <IRQ>
[ 401.032276][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 401.032286][ C2] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 401.032297][ C2] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 401.032318][ C2] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 401.032327][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 401.032333][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:230) 
[ 401.032337][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 401.032346][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 401.032353][ C2] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 401.032360][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 401.032363][ C2] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 401.032368][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 401.032372][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 401.032383][ C2] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 401.032392][ C2] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 401.032400][ C2] neigh_invalidate (net/core/neighbour.c:1008) 
[ 401.032409][ C2] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 401.032419][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 401.032423][ C2] call_timer_fn (kernel/time/timer.c:1789) 
[ 401.032427][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 401.032430][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 401.032434][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 401.032437][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:230) 
[ 401.032445][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4323) 
[ 401.032456][ C2] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 401.032459][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 401.032470][ C2] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 401.032472][ C2] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 401.032483][ C2] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 401.032489][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 401.032493][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 401.032496][ C2] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 401.032506][ C2] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 401.032511][ C2] handle_softirqs (kernel/softirq.c:561) 
[ 401.032524][ C2] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 401.032527][ C2] irq_exit_rcu (kernel/softirq.c:680) 
[ 401.032530][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[  401.032535][    C2]  </IRQ>
[  401.032536][    C2]  <TASK>
[ 401.032539][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 401.032544][ C2] RIP: 0010:unwind_next_frame (arch/x86/kernel/unwind_orc.c:406 arch/x86/kernel/unwind_orc.c:648) 
[ 401.032550][ C2] Code: 0f 84 25 ef ff ff 48 89 ef e8 38 dc ff ff 49 8d 7d 50 48 89 fa 48 89 c5 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 84 40 fe ff ff e8 f1 a3 8c 00 e9 36 fe ff ff 48 b8 00 00 00 00
All code
========
   0:	0f 84 25 ef ff ff    	je     0xffffffffffffef2b
   6:	48 89 ef             	mov    %rbp,%rdi
   9:	e8 38 dc ff ff       	call   0xffffffffffffdc46
   e:	49 8d 7d 50          	lea    0x50(%r13),%rdi
  12:	48 89 fa             	mov    %rdi,%rdx
  15:	48 89 c5             	mov    %rax,%rbp
  18:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1f:	fc ff df 
  22:	48 c1 ea 03          	shr    $0x3,%rdx
  26:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  2a:*	0f 84 40 fe ff ff    	je     0xfffffffffffffe70		<-- trapping instruction
  30:	e8 f1 a3 8c 00       	call   0x8ca426
  35:	e9 36 fe ff ff       	jmp    0xfffffffffffffe70
  3a:	48                   	rex.W
  3b:	b8 00 00 00 00       	mov    $0x0,%eax

Code starting with the faulting instruction
===========================================
   0:	0f 84 40 fe ff ff    	je     0xfffffffffffffe46
   6:	e8 f1 a3 8c 00       	call   0x8ca3fc
   b:	e9 36 fe ff ff       	jmp    0xfffffffffffffe46
  10:	48                   	rex.W
  11:	b8 00 00 00 00       	mov    $0x0,%eax
[  401.032553][    C2] RSP: 0000:ffffc900006b6dc0 EFLAGS: 00000246
[  401.032556][    C2] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc900006b8000
[  401.032558][    C2] RDX: 1ffff920000d6de2 RSI: 0000000000000001 RDI: ffffc900006b6f10
[  401.032560][    C2] RBP: ffff888004fcce20 R08: ffffc900006b6f00 R09: 1ffff920000d6dc1
[  401.032562][    C2] R10: ffffc900006b6ec0 R11: ffffc900006b6f01 R12: 1ffff920000d6dc1
[  401.032563][    C2] R13: ffffc900006b6ec0 R14: ffffffffbb888818 R15: ffffc900006b75f8
[ 401.032581][ C2] ? fuse_request_queue_background (./include/linux/spinlock.h:391 fs/fuse/dev.c:617) 
[ 401.032592][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 401.032600][ C2] ? fuse_request_queue_background (./include/linux/spinlock.h:391 fs/fuse/dev.c:617) 
[ 401.032603][ C2] ? kernel_text_address (kernel/extable.c:99) 
[ 401.032610][ C2] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 401.032619][ C2] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 401.032631][ C2] ? fuse_simple_background (fs/fuse/dev.c:642) 
[ 401.032638][ C2] ? __pfx_free_object_rcu (mm/kmemleak.c:514) 
[ 401.032646][ C2] stack_trace_save (kernel/stacktrace.c:123) 
[ 401.032650][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 401.032657][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 401.032661][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:230) 
[ 401.032664][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 401.032669][ C2] kasan_save_stack (mm/kasan/common.c:48) 
[ 401.032674][ C2] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 401.032677][ C2] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 401.032680][ C2] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:123 kernel/rcu/tree.c:3067) 
[ 401.032685][ C2] ? kfree (./include/linux/kmemleak.h:49 mm/slub.c:2278 mm/slub.c:4609 mm/slub.c:4757) 
[ 401.032691][ C2] ? virtio_fs_enqueue_req (fs/fuse/virtio_fs.c:1472) 
[ 401.032697][ C2] ? virtio_fs_send_req (fs/fuse/virtio_fs.c:1500) 
[ 401.032700][ C2] ? flush_bg_queue (fs/fuse/dev.c:323) 
[ 401.032702][ C2] ? fuse_request_queue_background (./include/linux/spinlock.h:391 fs/fuse/dev.c:617) 
[ 401.032715][ C2] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 401.032721][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 401.032724][ C2] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2077 arch/x86/mm/physaddr.c:65) 
[ 401.032730][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 401.032733][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 401.032745][ C2] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2077 arch/x86/mm/physaddr.c:65) 
[ 401.032748][ C2] ? __pfx_free_object_rcu (mm/kmemleak.c:514) 
[ 401.032755][ C2] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:94 ./include/linux/rcupdate.h:964 ./include/linux/mmzone.h:2077 arch/x86/mm/physaddr.c:65) 
[ 401.032762][ C2] kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 401.032766][ C2] __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:123 kernel/rcu/tree.c:3067) 
[ 401.032775][ C2] kfree (./include/linux/kmemleak.h:49 mm/slub.c:2278 mm/slub.c:4609 mm/slub.c:4757) 
[ 401.032778][ C2] ? virtio_fs_enqueue_req (fs/fuse/virtio_fs.c:1462) 
[ 401.032781][ C2] ? virtio_fs_enqueue_req (fs/fuse/virtio_fs.c:1472) 
[ 401.032789][ C2] virtio_fs_enqueue_req (fs/fuse/virtio_fs.c:1472) 
[ 401.032802][ C2] ? __pfx_virtio_fs_enqueue_req (fs/fuse/virtio_fs.c:1377) 
[ 401.032815][ C2] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 401.032821][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 401.032823][ C2] ? fuse_get_unique (fs/fuse/dev.c:222) 
[ 401.032830][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 401.032834][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 401.032839][ C2] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 401.032844][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 401.032851][ C2] ? fuse_get_unique (fs/fuse/dev.c:222) 
[ 401.032856][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 401.032865][ C2] virtio_fs_send_req (fs/fuse/virtio_fs.c:1500) 
[ 401.032869][ C2] ? fuse_send_one (fs/fuse/dev.c:305) 
[ 401.032875][ C2] flush_bg_queue (fs/fuse/dev.c:323) 
[ 401.032886][ C2] fuse_request_queue_background (./include/linux/spinlock.h:391 fs/fuse/dev.c:617) 
[ 401.032894][ C2] fuse_simple_background (fs/fuse/dev.c:642) 
[ 401.032899][ C2] fuse_send_readpages (fs/fuse/file.c:993) 
[ 401.032910][ C2] fuse_readahead (fs/fuse/file.c:1031) 
[ 401.032926][ C2] ? __pfx_fuse_readahead (fs/fuse/file.c:1004) 
[ 401.032932][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 401.032935][ C2] ? __folio_batch_add_and_move (./include/linux/local_lock_internal.h:38 mm/swap.c:201) 
[ 401.032940][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 401.032943][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 401.032954][ C2] read_pages (mm/readahead.c:161) 
[ 401.032959][ C2] ? __folio_batch_add_and_move (./include/linux/local_lock_internal.h:38 mm/swap.c:201) 
[ 401.032970][ C2] ? __pfx_read_pages (mm/readahead.c:148) 
[ 401.032989][ C2] page_cache_ra_unbounded (./include/linux/fs.h:932 mm/readahead.c:299) 
[ 401.033004][ C2] do_sync_mmap_readahead (mm/filemap.c:3261) 
[ 401.033011][ C2] ? __pfx_do_sync_mmap_readahead (mm/filemap.c:3193) 
[ 401.033024][ C2] ? __filemap_get_folio (mm/filemap.c:1905) 
[ 401.033032][ C2] filemap_fault (mm/filemap.c:3447) 
[ 401.033038][ C2] ? alloc_pages_mpol (mm/mempolicy.c:2272) 
[ 401.033042][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 401.033047][ C2] ? __pfx_alloc_pages_mpol (mm/mempolicy.c:2227) 
[ 401.033049][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 401.033053][ C2] ? __pfx_filemap_fault (mm/filemap.c:3406) 
[ 401.033055][ C2] ? __up_read (./arch/x86/include/asm/atomic64_64.h:79 ./include/linux/atomic/atomic-arch-fallback.h:2749 ./include/linux/atomic/atomic-long.h:184 ./include/linux/atomic/atomic-instrumented.h:3317 kernel/locking/rwsem.c:1345) 
[ 401.033066][ C2] ? vma_alloc_folio_noprof (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/page-flags.h:829 ./include/linux/page-flags.h:850 mm/internal.h:711 mm/mempolicy.c:2295 mm/mempolicy.c:2324) 
[ 401.033069][ C2] ? __vmf_anon_prepare (./include/linux/mmap_lock.h:217 mm/memory.c:3392) 
[ 401.033076][ C2] ? __pfx_vma_alloc_folio_noprof (mm/mempolicy.c:2315) 
[ 401.033084][ C2] __do_fault (mm/memory.c:4977) 
[ 401.033090][ C2] do_pte_missing (mm/memory.c:5422 mm/memory.c:5528 mm/memory.c:4047) 
[ 401.033092][ C2] ? handle_pte_fault (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/linux/pgtable.h:136 mm/memory.c:5883) 
[ 401.033099][ C2] handle_pte_fault (mm/memory.c:5889) 
[ 401.033106][ C2] ? __pfx_handle_pte_fault (mm/memory.c:5846) 
[ 401.033118][ C2] __handle_mm_fault (mm/memory.c:6032) 
[ 401.033123][ C2] ? __pfx___handle_mm_fault (mm/memory.c:5941) 
[ 401.033141][ C2] ? __pfx_lock_vma_under_rcu (mm/memory.c:6357) 
[ 401.033148][ C2] handle_mm_fault (mm/memory.c:6213) 
[ 401.033153][ C2] ? __pfx_handle_mm_fault (mm/memory.c:6168) 
[ 401.033165][ C2] do_user_addr_fault (arch/x86/mm/fault.c:1338) 
[ 401.033179][ C2] exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:147 arch/x86/mm/fault.c:1489 arch/x86/mm/fault.c:1539) 
[ 401.033184][ C2] asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) 
[  401.033187][    C2] RIP: 0033:0x7fdeaf6329aa
[ 401.033192][ C2] Code: 0f 61 c0 66 0f 70 c0 00 48 83 fa 10 0f 82 7e 00 00 00 48 83 fa 20 77 12 0f 11 44 17 f0 0f 11 07 c3 0f 11 47 e0 0f 11 47 f0 c3 <0f> 11 07 0f 11 47 10 48 01 d7 48 83 fa 40 76 e7 0f 11 40 20 0f 11
All code
========
   0:	0f 61 c0             	punpcklwd %mm0,%mm0
   3:	66 0f 70 c0 00       	pshufd $0x0,%xmm0,%xmm0
   8:	48 83 fa 10          	cmp    $0x10,%rdx
   c:	0f 82 7e 00 00 00    	jb     0x90
  12:	48 83 fa 20          	cmp    $0x20,%rdx
  16:	77 12                	ja     0x2a
  18:	0f 11 44 17 f0       	movups %xmm0,-0x10(%rdi,%rdx,1)
  1d:	0f 11 07             	movups %xmm0,(%rdi)
  20:	c3                   	ret
  21:	0f 11 47 e0          	movups %xmm0,-0x20(%rdi)
  25:	0f 11 47 f0          	movups %xmm0,-0x10(%rdi)
  29:	c3                   	ret
  2a:*	0f 11 07             	movups %xmm0,(%rdi)		<-- trapping instruction
  2d:	0f 11 47 10          	movups %xmm0,0x10(%rdi)
  31:	48 01 d7             	add    %rdx,%rdi
  34:	48 83 fa 40          	cmp    $0x40,%rdx
  38:	76 e7                	jbe    0x21
  3a:	0f 11 40 20          	movups %xmm0,0x20(%rax)
  3e:	0f                   	.byte 0xf
  3f:	11                   	.byte 0x11

Code starting with the faulting instruction
===========================================
   0:	0f 11 07             	movups %xmm0,(%rdi)
   3:	0f 11 47 10          	movups %xmm0,0x10(%rdi)
   7:	48 01 d7             	add    %rdx,%rdi
   a:	48 83 fa 40          	cmp    $0x40,%rdx
   e:	76 e7                	jbe    0xfffffffffffffff7
  10:	0f 11 40 20          	movups %xmm0,0x20(%rax)
  14:	0f                   	.byte 0xf
  15:	11                   	.byte 0x11
[  401.033194][    C2] RSP: 002b:00007fff2a3e9978 EFLAGS: 00010206
[  401.033196][    C2] RAX: 00007fdeaf35c155 RBX: 0000000000000004 RCX: 00007fdeaf35c230
[  401.033198][    C2] RDX: 00000000000000db RSI: 0000000000000000 RDI: 00007fdeaf35c155
[  401.033200][    C2] RBP: 00007fff2a3e9ce0 R08: 00007fdeaf35c155 R09: 000000000009b000
[  401.033201][    C2] R10: 0000000000000003 R11: 0000000000000206 R12: 00007fff2a3e9a10


Finger prints:
lockdep_rcu_suspicious:icmp6_send:ip6_link_failure:ndisc_error_report:neigh_invalidate