rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=8a2/1/0x4000000000000000 softirq=61418/61419 fqs=18 (t=10502 jiffies g=112441 q=399) rcu: rcu_preempt kthread starved for 10466 jiffies! g112441 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: rcu_preempt I29120 10 2 0x00004000 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178 schedule+0xd0/0x2a0 kernel/sched/core.c:4253 schedule_timeout+0x148/0x250 kernel/time/timer.c:1897 rcu_gp_fqs_loop kernel/rcu/tree.c:1874 [inline] rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2044 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 NMI backtrace for cpu 0 CPU: 0 PID: 1042 Comm: syz-executor.2 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:320 print_cpu_stall kernel/rcu/tree_stall.h:553 [inline] check_cpu_stall kernel/rcu/tree_stall.h:627 [inline] rcu_pending kernel/rcu/tree.c:3489 [inline] rcu_sched_clock_irq.cold+0x5b3/0xccc kernel/rcu/tree.c:2504 update_process_times+0x25/0x60 kernel/time/timer.c:1726 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x108/0x290 kernel/time/tick-sched.c:1320 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0xe0/0x120 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline] RIP: 0010:lock_acquire+0x270/0xad0 kernel/locking/lockdep.c:4962 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d 6d d0 5a 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7 RSP: 0018:ffffc9001769ec98 EFLAGS: 00000282 RAX: 1ffffffff1369c08 RBX: ffff88802c596340 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: c4fcc381784afc2b RDI: 0000000000000282 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c58fa27 R10: fffffbfff18b1f44 R11: 0000000000000000 R12: 0000000000000002 R13: ffffffff89bc1180 R14: 0000000000000000 R15: ffff88802c596340 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] net_generic include/net/netns/generic.h:44 [inline] tipc_sk_lookup+0xd1/0xab0 net/tipc/socket.c:2967 tipc_sk_rcv+0x27a/0x1ec0 net/tipc/socket.c:2461 tipc_node_xmit+0x2b0/0xce0 net/tipc/node.c:1652 tipc_node_xmit_skb+0xd5/0x140 net/tipc/node.c:1712 tipc_sk_rcv+0x1754/0x1ec0 net/tipc/socket.c:2491 tipc_node_xmit+0x2b0/0xce0 net/tipc/node.c:1652 tipc_sk_push_backlog+0x324/0x790 net/tipc/socket.c:1303 tipc_sk_filter_connect net/tipc/socket.c:2226 [inline] tipc_sk_filter_rcv+0xafe/0x3250 net/tipc/socket.c:2335 tipc_sk_enqueue net/tipc/socket.c:2415 [inline] tipc_sk_rcv+0xd1a/0x1ec0 net/tipc/socket.c:2466 tipc_node_xmit+0x2b0/0xce0 net/tipc/node.c:1652 tipc_node_xmit_skb net/tipc/node.c:1712 [inline] tipc_node_distr_xmit+0x15c/0x3a0 net/tipc/node.c:1727 tipc_sk_backlog_rcv+0x155/0x1c0 net/tipc/socket.c:2383 sk_backlog_rcv include/net/sock.h:996 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2550 release_sock+0x54/0x1b0 net/core/sock.c:3066 tipc_release+0xbb1/0x1a70 net/tipc/socket.c:638 __sock_release+0xcd/0x280 net/socket.c:605 sock_close+0x18/0x20 net/socket.c:1278 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:216 [inline] __prepare_exit_to_usermode+0x1e9/0x1f0 arch/x86/entry/common.c:246 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:368 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb29 Code: Bad RIP value. RSP: 002b:00007fa199057c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000021 RAX: 0000000000000005 RBX: 00000000004dbfa0 RCX: 000000000045cb29 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000003 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00000000000000a4 R14: 00000000004c36c8 R15: 00007fa1990586d4