rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=a26/1/0x4000000000000000 softirq=91084/91085 fqs=0 (t=10501 jiffies g=176945 q=97) rcu: rcu_preempt kthread starved for 10502 jiffies! g176945 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: 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 1 CPU: 1 PID: 17626 Comm: syz-executor.1 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 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] sysvec_apic_timer_interrupt+0x4f/0x120 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596 RIP: 0010:__kasan_kmalloc.constprop.0+0x15/0xd0 mm/kasan/common.c:467 Code: 4c 29 c2 e8 ed 49 ff 01 83 e5 07 74 03 40 88 2b 5b 5d c3 66 90 41 57 49 89 d7 41 56 49 89 fe 41 55 41 54 49 89 f4 55 89 cd 53 <48> 83 ec 08 81 e1 00 04 00 00 75 78 4d 85 e4 74 61 49 63 56 74 4b RSP: 0018:ffffc90000da8b70 EFLAGS: 00000202 RAX: ffff88805cbf0980 RBX: 0000000000000a20 RCX: 0000000000000a20 RDX: 00000000000000e0 RSI: ffff88805cbf0980 RDI: ffff88821b77e8c0 RBP: 0000000000000a20 R08: 0000000000000000 R09: ffff88805cbf0980 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88805cbf0980 R13: 0000000000000a20 R14: ffff88821b77e8c0 R15: 00000000000000e0 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc_node mm/slab.c:3263 [inline] kmem_cache_alloc_node+0x130/0x3c0 mm/slab.c:3575 __alloc_skb+0x71/0x550 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1083 [inline] mrp_pdu_init net/802/mrp.c:300 [inline] mrp_pdu_append_vecattr_event+0x7b4/0x1020 net/802/mrp.c:399 mrp_attr_event+0x173/0x220 net/802/mrp.c:494 mrp_mad_event net/802/mrp.c:574 [inline] mrp_join_timer+0x5a/0xc0 net/802/mrp.c:591 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers.part.0+0x54c/0xa20 kernel/time/timer.c:1773 __run_timers kernel/time/timer.c:1745 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1786 __do_softirq+0x34c/0xa60 kernel/softirq.c:292 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] do_softirq_own_stack+0x111/0x170 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:387 [inline] __irq_exit_rcu kernel/softirq.c:417 [inline] irq_exit_rcu+0x229/0x270 kernel/softirq.c:429 sysvec_apic_timer_interrupt+0x54/0x120 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:197 Code: 5d be 03 00 00 00 e9 a6 b2 23 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 48 8b 14 25 00 ff 01 00 <65> 8b 05 90 47 8e 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 RSP: 0018:ffffc90003bdf738 EFLAGS: 00000292 RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff83b1e29b RDX: ffff88804c784340 RSI: ffff88804c784340 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffc90003bdf948 R10: 00000000000000e9 R11: 0000000000000000 R12: ffffffff8be54001 R13: 00000000000000e9 R14: 000000000000000f R15: 00000000000000e9 insn_get_prefixes.part.0+0x23d/0x1110 arch/x86/lib/insn.c:115 insn_get_prefixes arch/x86/lib/insn.c:108 [inline] insn_get_opcode.part.0+0x757/0x9d0 arch/x86/lib/insn.c:242 insn_get_opcode arch/x86/lib/insn.c:239 [inline] insn_get_modrm.part.0+0x2fd/0x740 arch/x86/lib/insn.c:294 insn_get_modrm arch/x86/lib/insn.c:291 [inline] insn_get_sib arch/x86/lib/insn.c:354 [inline] insn_get_sib arch/x86/lib/insn.c:347 [inline] insn_get_displacement.part.0+0x686/0x8f0 arch/x86/lib/insn.c:385 insn_get_displacement arch/x86/lib/insn.c:382 [inline] insn_get_immediate.part.0+0x2b0/0x1880 arch/x86/lib/insn.c:554 insn_get_immediate arch/x86/lib/insn.c:551 [inline] insn_get_length+0x117/0x150 arch/x86/lib/insn.c:624 text_poke_loc_init+0xad/0x3c0 arch/x86/kernel/alternative.c:1233 arch_jump_label_transform_queue+0x93/0xf0 arch/x86/kernel/jump_label.c:117 __jump_label_update+0x12e/0x400 kernel/jump_label.c:441 jump_label_update kernel/jump_label.c:808 [inline] jump_label_update+0x1b3/0x3a0 kernel/jump_label.c:787 static_key_slow_inc_cpuslocked+0x1b2/0x250 kernel/jump_label.c:144 static_key_slow_inc+0x16/0x20 kernel/jump_label.c:159 kvm_arch_vcpu_create+0x1f6/0xb70 arch/x86/kvm/x86.c:9439 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3060 [inline] kvm_vm_ioctl+0x1547/0x23c0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3620 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb29 Code: Bad RIP value. RSP: 002b:00007efcbb5b1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e7ee0 RCX: 000000000045cb29 RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000003a2 R14: 00000000004c64a3 R15: 00007efcbb5b26d4