rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10500 ticks this GP) idle=be6/1/0x4000000000000000 softirq=36100/36102 fqs=2 (t=10502 jiffies g=45909 q=380) rcu: rcu_preempt kthread starved for 10499 jiffies! g45909 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:28880 pid: 11 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:3779 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4528 schedule+0xcf/0x270 kernel/sched/core.c:4606 schedule_timeout+0x148/0x250 kernel/time/timer.c:1871 rcu_gp_fqs_loop kernel/rcu/tree.c:1925 [inline] rcu_gp_kthread+0xb4c/0x1c90 kernel/rcu/tree.c:2099 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 NMI backtrace for cpu 1 CPU: 1 PID: 14608 Comm: syz-executor.5 Not tainted 5.10.0-rc7-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+0x107/0x163 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline] check_cpu_stall kernel/rcu/tree_stall.h:637 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567 update_process_times+0x77/0xd0 kernel/time/timer.c:1709 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:rcu_read_unlock_special kernel/rcu/tree_plugin.h:641 [inline] RIP: 0010:__rcu_read_unlock+0x1d3/0x470 kernel/rcu/tree_plugin.h:399 Code: ff a4 7e 81 e2 00 00 0f 00 0f 85 0b 02 00 00 4d 85 ed 74 62 84 c0 74 5e bf 09 00 00 00 e8 d5 7f e5 ff e8 40 d3 18 00 41 54 9d a5 fe ff ff 0f 0b 5b 5d 41 5c 41 5d 41 5e c3 e8 c8 91 54 00 e9 RSP: 0018:ffffc90000d90808 EFLAGS: 00000246 RAX: 00000000012a75e0 RBX: ffff8880b9f35740 RCX: ffffffff8155a917 RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000 RBP: ffff88807388cec0 R08: 0000000000000001 R09: ffffffff8ebaf6e7 R10: fffffbfff1d75edc R11: 0000000000000001 R12: 0000000000000246 R13: 0000000000000200 R14: 0000000000000000 R15: 0000000000000246 rcu_read_unlock include/linux/rcupdate.h:694 [inline] is_bpf_text_address+0xb3/0x160 kernel/bpf/core.c:710 kernel_text_address kernel/extable.c:151 [inline] kernel_text_address+0xbd/0xf0 kernel/extable.c:120 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:318 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:313 arch_stack_walk+0x93/0xe0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0x102/0x140 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1544 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1577 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3158 inet_bind_bucket_destroy net/ipv4/inet_hashtables.c:91 [inline] inet_bind_bucket_destroy+0xdf/0x120 net/ipv4/inet_hashtables.c:87 inet_twsk_bind_unhash+0x121/0x1b0 net/ipv4/inet_timewait_sock.c:39 inet_twsk_kill+0x21d/0x470 net/ipv4/inet_timewait_sock.c:59 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410 expire_timers kernel/time/timer.c:1455 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747 __run_timers kernel/time/timer.c:1728 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:pv_unhash kernel/locking/qspinlock_paravirt.h:246 [inline] RIP: 0010:__pv_queued_spin_unlock_slowpath+0xa6/0x290 kernel/locking/qspinlock_paravirt.h:517 Code: 63 ed eb 1a 4c 89 eb 48 21 eb 48 83 c5 01 48 c1 e3 04 4c 01 fb 48 39 d5 0f 84 95 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 <0f> 85 6e 01 00 00 48 8b 03 49 39 c4 75 cc 48 8d 7b 08 48 b8 00 00 RSP: 0018:ffffc900026efa48 EFLAGS: 00000246 RAX: 1ffff11047ffcd78 RBX: ffff88823ffe6bc0 RCX: 0000000000000008 RDX: 00000000000001b1 RSI: 0000000000000003 RDI: ffffffff8b461060 RBP: 00000000000000b1 R08: 0000000000000000 R09: ffffffff8b461063 R10: fffffbfff168c20c R11: 0000000000000000 R12: ffffffff8b461060 R13: 00000000000000ff R14: dffffc0000000000 R15: ffff88823ffe60c0 __raw_callee_save___pv_queued_spin_unlock_slowpath+0x11/0x20 .slowpath+0x9/0xe pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:559 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:56 [inline] do_raw_spin_unlock+0x171/0x230 kernel/locking/spinlock_debug.c:139 __raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock+0x1a/0x40 kernel/locking/spinlock.c:183 spin_unlock include/linux/spinlock.h:394 [inline] __khugepaged_exit+0x28d/0x3f0 mm/khugepaged.c:527 khugepaged_exit include/linux/khugepaged.h:52 [inline] __mmput+0x389/0x470 kernel/fork.c:1078 mmput+0x53/0x60 kernel/fork.c:1100 exit_mm kernel/exit.c:486 [inline] do_exit+0xa72/0x29b0 kernel/exit.c:796 do_group_exit+0x125/0x310 kernel/exit.c:906 get_signal+0x42a/0x1f10 kernel/signal.c:2758 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e0f9 Code: Unable to access opcode bytes at RIP 0x45e0cf. RSP: 002b:00007fe16d164c68 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: fffffffffffffdfe RBX: 0000000000000006 RCX: 000000000045e0f9 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000040 RBP: 000000000119bfd8 R08: 0000000020000200 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff32da7fdf R14: 00007fe16d1659c0 R15: 000000000119bf8c