rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10477 ticks this GP) idle=c75c/1/0x4000000000000000 softirq=54407/54408 fqs=5249
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   790841          0            0
rcu: 	cputime:    28541      23938          116   ==> 52490(ms)
rcu: 	(t=10501 jiffies g=44889 q=3525 ncpus=2)
CPU: 1 UID: 0 PID: 12746 Comm: syz.2.1833 Not tainted 6.16.0-syzkaller-06600-g1dbf1d590d10-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:rcu_read_unlock_special+0x87/0x4c0
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 b2 e8 f2 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900001e0400 EFLAGS: 00000206
RAX: 9871465371ecf200 RBX: 1ffff9200003c088 RCX: 9871465371ecf200
RDX: 0000000000000002 RSI: ffffffff8d9792dd RDI: ffffffff8be30a00
RBP: ffffc900001e04f8 R08: ffffffff8fa07bf7 R09: 1ffffffff1f40f7e
R10: dffffc0000000000 R11: fffffbfff1f40f7f R12: ffffffff8e141800
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007f63263d56c0(0000) GS:ffff8881a3c80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6328211e19 CR3: 000000012cf86000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000050602
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 skb_release_data+0x62d/0x7c0
 sk_skb_reason_drop+0x127/0x170
 neigh_invalidate+0x235/0x460
 neigh_timer_handler+0x949/0x1150
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 eb 1f 1f f6 e8 c6 48 56 f6 fb bf 01 00 00 00 <e8> eb aa ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc900087870c0 EFLAGS: 00000282
RAX: 9871465371ecf200 RBX: 0000000000000000 RCX: 9871465371ecf200
RDX: 0000000000000007 RSI: ffffffff8d9792dd RDI: 0000000000000001
RBP: ffffc90008787160 R08: ffffffff8fa07bf7 R09: 1ffffffff1f40f7e
R10: dffffc0000000000 R11: fffffbfff1f40f7f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920010f0e18
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:___cache_free+0x30/0xf0
Code: 41 56 41 54 53 49 89 d6 48 89 f3 49 89 ff 4c 8b 25 1d 58 a1 0b 48 89 f7 e8 ed 84 5c ff 48 c1 e8 06 48 83 e0 c0 49 8b 4c 04 08 <f6> c1 01 75 79 49 01 c4 66 90 41 0f b6 44 24 33 c1 e0 18 45 31 c0
RSP: 0018:ffffc90008787220 EFLAGS: 00000202
RAX: 00000000009d7480 RBX: ffff8880275d2f80 RCX: ffffea00009d7401
RDX: ffffc90020c99000 RSI: 0000000000003d69 RDI: 0000000000003d6a
RBP: ffff888023594f00 R08: 0000000000000023 R09: ffff888026ddcc40
R10: 0000000000000000 R11: fffffbfff1f40f7f R12: ffffea0000000000
R13: 0000000000000000 R14: ffffffff8222e60c R15: ffff88801b68d640
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 ptlock_alloc+0x20/0x70
 pte_alloc_one+0x7d/0x170
 __pte_alloc+0x25/0x1a0
 copy_pmd_range+0x68e6/0x7000
 copy_page_range+0xc46/0x1270
 dup_mmap+0xf57/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x1706/0x3c00
 kernel_clone+0x21e/0x840
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f632818ebe9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f63263d4fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f63283b6090 RCX: 00007f632818ebe9
RDX: 0000200000000200 RSI: 0000200000000370 RDI: 0000000020801000
RBP: 00007f6328211e19 R08: 0000200000000540 R09: 0000200000000540
R10: 0000200000000240 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f63283b6128 R14: 00007f63283b6090 R15: 00007fff8a2a5478
 </TASK>
