rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=f744/1/0x4000000000000000 softirq=12816/12817 fqs=5132
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1035093          0            0
rcu: 	cputime:    29120      21739           86   ==> 50870(ms)
rcu: 	(t=10502 jiffies g=8945 q=2693 ncpus=2)
CPU: 0 UID: 0 PID: 6092 Comm: syz.1.48 Not tainted syzkaller #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_next_frame+0x513/0x23c0
Code: c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49
RSP: 0018:ffffc90000007478 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffffff9031f150 RCX: dffffc0000000000
RDX: ffffffff9031f150 RSI: ffffffff90b210a2 RDI: ffffffff8c27b3a0
RBP: ffffffff9031f150 R08: 0000000000000001 R09: ffffffff8e75e3e0
R10: ffffc90000007598 R11: ffffffff81b0bfa0 R12: ffffffff82179a92
R13: ffffffff9031f150 R14: ffffc90000007548 R15: ffffffff9031f150
FS:  00007f28b244d6c0(0000) GS:ffff88818de63000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000269000 CR3: 000000011ae96000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x31c/0x660
 dst_cow_metrics_generic+0x56/0x1c0
 icmp6_dst_alloc+0x265/0x440
 ndisc_send_skb+0x44a/0x1670
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x640
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:pfn_valid+0x325/0x480
Code: 8b 1d ff 93 df 10 31 ed 31 ff 89 de e8 b4 65 89 ff 85 db 0f 84 d3 00 00 00 e8 67 61 89 ff e9 b7 00 00 00 e8 5d 61 89 ff 31 ed <e8> a6 bb 71 09 41 89 c6 31 ff 89 c6 e8 8a 65 89 ff 45 85 f6 74 10
RSP: 0018:ffffc900070ff210 EFLAGS: 00000283
RAX: ffffffff823c3b97 RBX: ffffffff823c39ea RCX: 0000000000080000
RDX: ffffc9000a6a1000 RSI: 000000000001787f RDI: 0000000000017880
RBP: 0000000000000001 R08: ffffffff823c39ea R09: ffffffff8e75e4a0
R10: dffffc0000000000 R11: ffffed1021ad6455 R12: dffffc0000000000
R13: 0000000000000008 R14: 00000000000131fe R15: ffff88814fef4040
 page_table_check_set+0x25/0x610
 set_ptes+0x233/0x240
 do_pte_missing+0x2df3/0x3750
 handle_mm_fault+0x1bec/0x3310
 do_user_addr_fault+0x75b/0x1340
 exc_page_fault+0x6a/0xc0
 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 47 04 00 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc900070ff798 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881172e0000 RCX: 0000000000000e28
RDX: 0000000000000001 RSI: 0000200000269000 RDI: ffff8881172e0ec0
RBP: ffffc900070ff8f0 R08: ffff8881172e7fff R09: 1ffff11022e5cfff
R10: dffffc0000000000 R11: ffffed1022e5d000 R12: ffffc900070ffbb8
R13: 0000200000268140 R14: 0000000000008000 R15: 1ffff92000e1ff77
 _copy_from_iter+0x21b/0x1670
 kcm_sendmsg+0xe0c/0x2b60
 sock_write_iter+0x49b/0x4f0
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f28b159c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f28b244d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f28b1815fa0 RCX: 00007f28b159c799
RDX: 00000000fffffdef RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007f28b1632c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f28b1816038 R14: 00007f28b1815fa0 R15: 00007fffc14dea58
 </TASK>
sched: DL replenish lagged too much
