rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=f96c/1/0x4000000000000000 softirq=16344/16344 fqs=4902
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1076715          0            0
rcu: 	cputime:    26616      25863           90   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=8981 q=1777 ncpus=2)
CPU: 0 UID: 0 PID: 6258 Comm: syz.1.117 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:unwind_get_return_address+0x0/0x90
Code: f7 49 89 f7 e8 31 a3 b0 00 4c 89 f7 4c 89 fe e9 29 ff ff ff e8 11 df fb 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 41 57 41 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df
RSP: 0018:ffffc900000075a0 EFLAGS: 00000202
RAX: 00000000298ec901 RBX: ffffc90000007660 RCX: 639b8b33f1cb9400
RDX: 0000000000000002 RSI: ffffffff8d998836 RDI: ffffc900000075a8
RBP: ffffc90000007630 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffff88801f663980
R13: ffff88802379c000 R14: ffffffff81ad0050 R15: ffffc900000075a8
FS:  00007fdd515a06c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001cf0 CR3: 00000001120a0000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0xfc/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 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_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:ffffc900071675c0 EFLAGS: 00000282
RAX: 639b8b33f1cb9400 RBX: 0000000000000000 RCX: 639b8b33f1cb9400
RDX: 0000000000000006 RSI: ffffffff8d998836 RDI: 0000000000000001
RBP: ffffc90007167660 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000e2ceb8
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:anon_vma_interval_tree_insert+0x4/0x3c0
Code: 09 e8 d0 54 b9 ff 48 8b 3c 24 e8 17 25 21 ff 90 0f 0b 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 <55> 41 57 41 56 41 55 41 54 53 48 83 ec 18 49 89 f5 48 89 fd 48 bb
RSP: 0018:ffffc90007167728 EFLAGS: 00000246
RAX: 1ffff1100531d926 RBX: ffff88802851ccb0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffff88810f577610 RDI: ffff88802851ccb0
RBP: ffff8880298ec900 R08: 00000000ffffffff R09: ffffffff822bef09
R10: ffff88802851ccb0 R11: ffffffff81ad0050 R12: ffff88802830cb70
R13: dffffc0000000000 R14: ffff88810f577550 R15: ffff88802851ccc0
 anon_vma_clone+0x241/0x4f0
 anon_vma_fork+0x79/0x500
 dup_mmap+0x9eb/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x16d3/0x3b80
 kernel_clone+0x21e/0x870
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd5078e9a9
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:00007fdd5159ffe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fdd509b5fa0 RCX: 00007fdd5078e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000040000
RBP: 00007fdd50810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fdd509b5fa0 R15: 00007ffc8f468148
 </TASK>
sched: DL replenish lagged too much
