rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=98c4/1/0x4000000000000000 softirq=26506/26513 fqs=4704
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1158276          0            0
rcu: 	cputime:    29859      22620           83   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=15465 q=2634 ncpus=2)
CPU: 0 UID: 0 PID: 7953 Comm: syz.3.579 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:rcu_is_watching+0x5a/0xb0
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 2c c3 7c 00 48 c7 c3 98 6f a1 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 34 8b 03 65 ff 0d a9 e1 f9 10 74 11 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc900000072b8 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffff88804b032f98 RCX: ea7200647aafc900
RDX: 0000000000000000 RSI: ffffffff8be332e0 RDI: ffffffff8be332a0
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff8172c195
R10: ffffc900000073f8 R11: ffffffff81ac3930 R12: 1ffff92000000e75
R13: ffffc900000073e0 R14: ffffffff8dbded10 R15: dffffc0000000000
FS:  00007f89850036c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32c15ff8 CR3: 0000000044164000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0xd4/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 __kfence_alloc+0x2b2/0x3b0
 kmem_cache_alloc_noprof+0x316/0x3c0
 dst_alloc+0x105/0x170
 icmp6_dst_alloc+0x75/0x420
 ndisc_send_skb+0x41f/0x1440
 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: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 fb 88 15 f6 e8 36 e3 4c f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90002dff160 EFLAGS: 00000286
RAX: ea7200647aafc900 RBX: 0000000000000000 RCX: ea7200647aafc900
RDX: 0000000000000007 RSI: ffffffff8d9b6a7d RDI: 0000000000000001
RBP: ffffc90002dff210 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920005bfe2c
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70
Code: 89 fb e8 23 00 00 00 48 8b 3d a4 48 fe 0b 48 89 de 5b e9 63 a4 58 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 40 a0 92 65 8b 15 c8 93
RSP: 0018:ffffc90002dff2d8 EFLAGS: 00000297
RAX: 0000000000000000 RBX: 0000000000000006 RCX: ffff88801f62d640
RDX: 0000000000000002 RSI: 000020000009d000 RDI: 00001fffffffefff
RBP: fffffffffffffffa R08: ffff88801f62d640 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000002 R12: ffff888028aa9e38
R13: 00001fffffffefff R14: 000020000009d000 R15: ffff888028aa9e00
 mtree_range_walk+0x2c2/0x840
 mt_find+0x23f/0x5f0
 find_vma+0xe7/0x160
 lock_mm_and_find_vma+0x5f/0x300
 do_user_addr_fault+0x331/0x1390
 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 c3 cc cc cc cc 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc90002dff758 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888044ac8000 RCX: 0000000000000628
RDX: 0000000000000001 RSI: 000020000009d000 RDI: ffff888044accec0
RBP: ffffc90002dff8b0 R08: ffff888044acffff R09: 1ffff11008959fff
R10: dffffc0000000000 R11: ffffed100895a000 R12: 1ffff920005bff77
R13: 0000200000098140 R14: ffffc90002dffbc8 R15: 0000000000008000
 _copy_from_iter+0x24c/0x16f0
 kcm_sendmsg+0xf00/0x2ad0
 __sock_sendmsg+0x21c/0x270
 sock_write_iter+0x258/0x330
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f898418eba9
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:00007f8985003038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f89843d5fa0 RCX: 00007f898418eba9
RDX: 00000000fffffdef RSI: 0000200000000140 RDI: 0000000000000007
RBP: 00007f8984211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f89843d6038 R14: 00007f89843d5fa0 R15: 00007ffdec639578
 </TASK>
sched: DL replenish lagged too much
