rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=f66c/1/0x4000000000000000 softirq=27533/27534 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=21021, q=115 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8166 Comm: syz.0.671 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:lock_release+0xaf/0x3e0
Code: 0a 00 00 00 0f 85 1e 02 00 00 49 81 3e 20 93 64 93 0f 84 11 02 00 00 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 48 8b 5c 24 20 <fa> 48 c7 c7 78 dc 9c 8d e8 64 f1 dc 09 65 ff 05 0d 8f 03 11 c7 44
RSP: 0018:ffffc900001df218 EFLAGS: 00000087
RAX: 0000000000000000 RBX: 0000000000000087 RCX: 80c3a4916aff9700
RDX: 0000000000010100 RSI: ffffffff8be33de0 RDI: ffffffff8be33da0
RBP: ffffc900001df318 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003be40 R12: dffffc0000000000
R13: ffffffff81ada91e R14: ffff888136627a98 R15: ffff888020198000
FS:  00007fe08dc1b6c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f631f65d440 CR3: 000000011ae1a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_unlock_irqrestore+0x70/0x110
 hrtimer_try_to_cancel+0x3be/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__kfree_skb+0x58/0x70
Code: df 80 3c 08 00 74 08 4c 89 f7 e8 43 e9 c7 f8 49 83 3e 00 74 1a e8 78 6b 64 f8 48 89 df be 02 00 00 00 e8 eb 2a 00 00 48 89 df <5b> 41 5e eb 23 e8 5e 6b 64 f8 eb f1 66 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc900001dfae8 EFLAGS: 00000292
RAX: 0000000000000000 RBX: ffff88803ab4c000 RCX: 1ffff1100756980f
RDX: ffff88803ab4c07e RSI: ffffffff8d9ba14a RDI: ffff88803ab4c000
RBP: ffffc900001dfdf0 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: ffff8881060f9a00
R13: dffffc0000000000 R14: ffff88803ab4c0d0 R15: 0000000000000004
 tcp_ack+0x1fd2/0x6150
 tcp_rcv_established+0xe96/0x1eb0
 tcp_v4_do_rcv+0xa23/0xce0
 tcp_v4_rcv+0x26a6/0x2f40
 ip_protocol_deliver_rcu+0x221/0x440
 ip_local_deliver_finish+0x3bb/0x6f0
 NF_HOOK+0x30c/0x3a0
 ip_sublist_rcv_finish+0x221/0x2a0
 ip_sublist_rcv+0x6e7/0x9b0
 ip_list_rcv+0x3e2/0x430
 __netif_receive_skb_list_core+0x7d2/0x800
 netif_receive_skb_list_internal+0x975/0xcc0
 napi_complete_done+0x2f2/0x7c0
 e1000_clean+0xd0b/0x2b00
 __napi_poll+0xc7/0x360
 net_rx_action+0x707/0xe30
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 common_interrupt+0xbb/0xe0
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40
RIP: 0010:arch_stack_walk+0x123/0x150
Code: 34 09 00 48 85 c0 74 24 48 89 df 48 89 c6 4d 89 f3 2e e8 10 96 13 0a 84 c0 74 11 4c 89 ff e8 b4 35 09 00 83 bd 78 ff ff ff 00 <75> cf 65 48 8b 05 d3 34 37 11 48 3b 45 d8 75 12 48 83 c4 68 5b 41
RSP: 0018:ffffc9000368f908 EFLAGS: 00000202
RAX: 0000000090b9de01 RBX: ffffc9000368f9c0 RCX: 80c3a4916aff9700
RDX: 0000000000000000 RSI: ffffffff8dba981c RDI: ffff888020198000
RBP: ffffc9000368f990 R08: ffffc9000368fe48 R09: 0000000000000000
R10: ffffc9000368f958 R11: fffff520006d1f2d R12: ffff888020198000
R13: ffff888039547850 R14: ffffffff81ac4d00 R15: ffffc9000368f908
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 security_inode_alloc+0x39/0x330
 inode_init_always_gfp+0x9ed/0xdc0
 alloc_inode+0x82/0x1b0
 __sock_create+0x12d/0x9f0
 __sys_socketpair+0x1c5/0x560
 __x64_sys_socketpair+0x9b/0xb0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe08cd8eba9
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:00007fe08dc1b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007fe08cfd5fa0 RCX: 00007fe08cd8eba9
RDX: 0000000000000004 RSI: 0000000000000800 RDI: 0000000000000009
RBP: 00007fe08ce11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe08cfd6038 R14: 00007fe08cfd5fa0 R15: 00007ffdf87d4bd8
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g21021 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:27112 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 8164 Comm: rm 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:native_queued_spin_lock_slowpath+0xb2/0x8e0
Code: c7 44 24 60 00 00 00 00 0f 1f 44 00 00 4c 8d 74 24 60 49 89 df 49 c1 ef 03 41 bd 01 00 00 00 eb 06 89 44 24 60 f3 90 48 89 df <be> 04 00 00 00 e8 d4 42 a6 f6 48 b8 00 00 00 00 00 fc ff df 41 0f
RSP: 0018:ffffc90000007980 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff8881060f9bc0 RCX: ffffffff8b7cfe5c
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8881060f9bc0
RBP: ffffc90000007a78 R08: ffff8881060f9bc3 R09: 1ffff11020c1f378
R10: dffffc0000000000 R11: ffffed1020c1f379 R12: 1ffff92000000f38
R13: 0000000000000001 R14: ffffc900000079e0 R15: 1ffff11020c1f378
FS:  00007f631f5e1380(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000d000 CR3: 000000011ae1a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 queued_spin_lock_slowpath+0x43/0x50
 do_raw_spin_lock+0x21f/0x290
 tcp_write_timer+0x62/0x2e0
 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:smp_call_function_many_cond+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 56 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 01 5f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 e5 5e
RSP: 0018:ffffc9000369f6c0 EFLAGS: 00000293
RAX: ffffffff81b4621b RBX: 1ffff11026cc7f61 RCX: ffff888107733980
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000369f840 R08: ffff88810c743507 R09: 1ffff110218e86a0
R10: dffffc0000000000 R11: ffffed10218e86a1 R12: ffff88813663fb08
R13: dffffc0000000000 R14: ffff88804b03b1c0 R15: 0000000000000001
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 tlb_flush_mmu+0x1a7/0x680
 tlb_finish_mmu+0xc3/0x1d0
 exit_mmap+0x44c/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f631f71ba90
Code: Unable to access opcode bytes at 0x7f631f71ba66.
RSP: 002b:00007ffe28cbf598 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f631f80c860 RCX: 00007f631f71ba90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00007f631f80c860 R08: 00007ffe28cbf410 R09: 00007ffe28cbf4f0
R10: 00007ffe28cbf450 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f631f810658 R15: 0000000000000001
 </TASK>
sched: DL replenish lagged too much
