rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=61e/1/0x4000000000000004 softirq=112679/112680 fqs=2 rcu: (t=10501 jiffies g=141409 q=86) rcu: rcu_preempt kthread starved for 10498 jiffies! g141409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29208 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1825 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 1 CPU: 1 PID: 7683 Comm: syz-executor.5 Not tainted 4.19.142-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+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682 update_process_times+0x2a/0xb0 kernel/time/timer.c:1650 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:184 Code: 48 c7 c0 48 5b d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d dc d0 94 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 7a d4 c2 f9 eb c0 0f 0b 0f 0b 48 c7 c7 48 RSP: 0018:ffff8880ae707ca0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a4b69 RBX: 0000000000000282 RCX: 1ffff11041598d5a RDX: dffffc0000000000 RSI: ffff88820acc6ab0 RDI: 0000000000000282 RBP: ffff888022080870 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88800f8bd980 R13: ffff888022080870 R14: ffff888022080858 R15: 0000000000000000 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] skb_dequeue+0x120/0x170 net/core/skbuff.c:2821 mrp_queue_xmit net/802/mrp.c:353 [inline] mrp_join_timer+0x97/0xc0 net/802/mrp.c:598 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1703 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1716 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:d_flags_for_inode+0x227/0x2a0 fs/dcache.c:1823 Code: 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 20 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 80 3c 02 00 75 69 49 83 7c 24 08 00 <75> 34 e8 a2 47 ba ff 41 83 cd 04 66 44 89 6b 02 e9 73 fe ff ff e8 RSP: 0018:ffff888205f5fcb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff88807fe290b0 RCX: ffffc900107b6000 RDX: 1ffffffff10544c9 RSI: ffffffff81af6992 RDI: ffffffff882a2648 RBP: 000000000000c000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000003 R11: 00000000ba212a69 R12: ffffffff882a2640 R13: 0000000000000008 R14: ffffffff882a2a60 R15: ffff88821b78c5c0 __d_instantiate+0x21/0x3c0 fs/dcache.c:1841 d_instantiate+0x6d/0x90 fs/dcache.c:1874 alloc_file_pseudo+0x151/0x250 fs/file_table.c:230 sock_alloc_file+0x48/0x180 net/socket.c:394 __sys_socketpair+0x2fb/0x570 net/socket.c:1428 __do_sys_socketpair net/socket.c:1457 [inline] __se_sys_socketpair net/socket.c:1454 [inline] __x64_sys_socketpair+0x93/0xf0 net/socket.c:1454 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d5b9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007efde09f4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 0000000000033900 RCX: 000000000045d5b9 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000000001e RBP: 000000000118d028 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000180 R11: 0000000000000246 R12: 000000000118cfec R13: 00007ffea64333cf R14: 00007efde09f59c0 R15: 000000000118cfec nla_parse: 21 callbacks suppressed netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.