rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=e774/1/0x4000000000000000 softirq=29098/29101 fqs=4907
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1053078          0            0
rcu: 	cputime:    23401      29087           87   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=22113 q=4499 ncpus=2)
CPU: 0 UID: 0 PID: 9139 Comm: syz.3.1049 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+0x46e/0x2550
Code: d1 48 89 15 04 8c cc 11 48 85 d2 0f 84 2e 02 00 00 48 8d 5a 04 48 89 54 24 18 4c 8d 6a 05 48 89 d8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 b4 19 00 00 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0
RSP: 0018:ffffc90000007600 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffffffff90c6b738 RCX: ffffffff904abe58
RDX: ffffffff90c6b734 RSI: ffffffff90c6b734 RDI: ffffffff8c2a8d20
RBP: ffffffff8177c7c3 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc900000076f8 R11: ffffffff81b12860 R12: dffffc0000000000
R13: ffffffff90c6b739 R14: ffffc900000076a8 R15: ffffffff904abe58
FS:  00007f1c015216c0(0000) GS:ffff88818dc51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000005ac000 CR3: 00000001767b4000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x380/0x680
 __alloc_skb+0x1d7/0x7a0
 ndisc_alloc_skb+0xa0/0x480
 ndisc_send_rs+0x288/0x6b0
 addrconf_rs_timer+0x2d2/0x6c0
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x225/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x417/0xbc0
Code: 03 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 13 7c 1c 0a e8 4e ac 39 00 fb 4c 8b 65 c8 <49> 8d bc 24 f8 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc90005f76f60 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88812103bda0 RCX: 0000000080000002
RDX: 0000000000000000 RSI: ffffffff8c2a8d60 RDI: ffffffff8194c0d2
RBP: ffffc90005f76fb0 R08: ffffffff9031b4f7 R09: 1ffffffff206369e
R10: dffffc0000000000 R11: fffffbfff206369f R12: ffff88810a5e9dc0
R13: ffff88812103bd68 R14: dffffc0000000000 R15: 1ffff110242077b4
 __schedule+0x17e1/0x56c0
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x8f0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule+0x0/0x30
Code: 00 00 e8 63 e4 e3 f5 e9 8e cd 01 00 cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 65 8b 05 75 37 8d 07 a9 ff ff ff 7f 75 09 9c 58 a9 00
RSP: 0018:ffffc90005f772e0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8c2a8d60 RDI: 00000000ffffffff
RBP: ffffc90005f77330 R08: ffffffff9031b4f7 R09: 1ffffffff206369e
R10: dffffc0000000000 R11: fffffbfff206369f R12: 0000000000000004
R13: 0000607d567ba8c0 R14: 0000000000000001 R15: ffff88816e34e200
 preempt_schedule_thunk+0x16/0x40
 count_memcg_events+0x147/0x280
 count_memcg_event_mm+0x14c/0x260
 handle_mm_fault+0x2e1e/0x3080
 do_user_addr_fault+0x744/0x1340
 exc_page_fault+0x6a/0xc0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x75/0xa0
Code: 05 e9 bf 61 04 00 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 8d 61 04 00 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc90005f77778 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888114d78000 RCX: 0000000000000828
RDX: 0000000000000001 RSI: 00002000005ac000 RDI: ffff888114d7bec0
RBP: ffffc90005f778d0 R08: ffff888114d7ffff R09: 1ffff110229affff
R10: dffffc0000000000 R11: ffffed10229b0000 R12: ffffc90005f77bd8
R13: 00002000005a8140 R14: 0000000000008000 R15: 1ffff92000beef7b
 _copy_from_iter+0x21b/0x1660
 kcm_sendmsg+0xe32/0x2ad0
 sock_sendmsg_nosec+0x13a/0x180
 sock_write_iter+0x2de/0x3e0
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c0059ce59
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:00007f1c01521028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1c00815fa0 RCX: 00007f1c0059ce59
RDX: 00000000fffffdef RSI: 0000200000000140 RDI: 0000000000000008
RBP: 00007f1c00632e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1c00816038 R14: 00007f1c00815fa0 R15: 00007ffcef928518
 </TASK>
sched: DL replenish lagged too much
