rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=7564/1/0x4000000000000000 softirq=23536/23536 fqs=1021
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   377799          0            0
rcu: 	cputime:    10304      11705           44   ==> 22010(ms)
rcu: 	(t=10500 jiffies g=15637 q=2371 ncpus=2)
CPU: 0 UID: 0 PID: 8041 Comm: syz.2.928 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a-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:get_random_u8+0x52e/0x940
Code: 23 15 00 00 00 00 66 42 c7 44 23 19 00 00 42 c6 44 23 1b 00 65 48 8b 0d 70 fa 55 0d 48 3b 8c 24 20 01 00 00 0f 85 1a 01 00 00 <48> 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 cf 4d 27 06 cc e8 e9
RSP: 0018:ffffc90000007400 EFLAGS: 00000246
RAX: 0000000000000013 RBX: 1ffff92000000e88 RCX: ecbc213157831c00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007570 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: dffffc0000000000
R13: 0000000000000051 R14: ffff88804b0360f0 R15: 0000000000000200
FS:  00007fa4950bf6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000a37000 CR3: 0000000112008000 CR4: 00000000000006f0
DR0: ffff8880b8927a20 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 kfence_guarded_alloc+0x9d/0xc70
 __kfence_alloc+0x385/0x3b0
 kmem_cache_alloc_node_noprof+0x315/0x3c0
 __alloc_skb+0x112/0x2d0
 ndisc_alloc_skb+0x9f/0x480
 ndisc_send_rs+0x2b5/0x630
 addrconf_rs_timer+0x369/0x670
 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: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:ffffc9000299f758 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88803acd8000 RCX: 0000000000000228
RDX: 0000000000000001 RSI: 0000200000a37000 RDI: ffff88803acdeec0
RBP: ffffc9000299f8b0 R08: ffff88803acdffff R09: 1ffff1100759bfff
R10: dffffc0000000000 R11: ffffed100759c000 R12: 1ffff92000533f77
R13: 0000200000a30140 R14: ffffc9000299fbc8 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: 0033:0x7fa49418eb69
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:00007fa4950bf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa4943b5fa0 RCX: 00007fa49418eb69
RDX: 00000000fffffdef RSI: 0000200000000140 RDI: 000000000000000b
RBP: 00007fa494211df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa4943b5fa0 R15: 00007ffc40ede7b8
 </TASK>
sched: DL replenish lagged too much
