rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10473 ticks this GP) idle=695c/1/0x4000000000000000 softirq=21147/21148 fqs=5235
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1073278          0            0
rcu: 	cputime:    27363      25116          130   ==> 52490(ms)
rcu: 	(t=10501 jiffies g=12825 q=22200 ncpus=2)
CPU: 1 UID: 0 PID: 7771 Comm: syz.2.815 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e #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 62 2c f8 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:ffffc900001e09c0 EFLAGS: 00000206
RAX: 7c53c0670fba4b00 RBX: 1ffff9200003c140 RCX: 7c53c0670fba4b00
RDX: 0000000000000002 RSI: ffffffff8d998836 RDI: ffffffff8be29f40
RBP: ffffc900001e0ac0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007f39358036c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000020f000 CR3: 00000001000ba000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 atomic_notifier_call_chain+0x16e/0x180
 neigh_timer_handler+0xaf2/0x1030
 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_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+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 8b 2d 21 f6 e8 c6 00 58 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90002d5f440 EFLAGS: 00000286
RAX: 7c53c0670fba4b00 RBX: 0000000000000000 RCX: 7c53c0670fba4b00
RDX: 0000000000000006 RSI: ffffffff8d998836 RDI: 0000000000000001
RBP: ffffc90002d5f4f0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920005abe88
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:do_user_addr_fault+0x1ae/0x1390
Code: 1b 48 89 de 48 81 e6 00 02 00 00 31 ff e8 8a 7d 4c 00 48 81 e3 00 02 00 00 0f 84 79 0e 00 00 e8 b8 04 54 00 fb 4c 89 7c 24 38 <0f> 1f 44 00 00 e8 88 78 4c 00 44 89 f6 83 e6 40 31 ff 48 89 74 24
RSP: 0018:ffffc90002d5f5b8 EFLAGS: 00000286
RAX: 7c53c0670fba4b00 RBX: 0000000000000200 RCX: 7c53c0670fba4b00
RDX: 0000000000000006 RSI: ffffffff8d998836 RDI: ffffffff8be29f40
RBP: dffffc0000000000 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffc90002d5f6a8
R13: 000020000020f000 R14: 0000000000000000 R15: ffff888021b41cc0
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x75/0x90
Code: 05 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29 c1 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 91 e9 fd 00 04 00 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc90002d5f758 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881068f8000 RCX: 0000000000000228
RDX: 0000000000000001 RSI: 000020000020f000 RDI: ffff8881068feec0
RBP: ffffc90002d5f8b0 R08: ffff8881068fffff R09: 1ffff11020d1ffff
R10: dffffc0000000000 R11: ffffed1020d20000 R12: 1ffff920005abf77
R13: 0000200000208140 R14: ffffc90002d5fbc8 R15: 0000000000008000
 _copy_from_iter+0x24c/0x16f0
 kcm_sendmsg+0xeb2/0x2a70
 __sock_sendmsg+0x21c/0x270
 sock_write_iter+0x258/0x330
 vfs_write+0x54b/0xa90
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f393498e9a9
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:00007f3935803038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3934bb5fa0 RCX: 00007f393498e9a9
RDX: 00000000fffffdef RSI: 0000200000000140 RDI: 0000000000000006
RBP: 00007f3934a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3934bb5fa0 R15: 00007ffc4d13c7b8
 </TASK>
sched: DL replenish lagged too much
