rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=903/1/0x4000000000000000 softirq=158462/158462 fqs=9 (t=10500 jiffies g=311905 q=88) rcu: rcu_preempt kthread starved for 10471 jiffies! g311905 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:28952 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x800 kernel/rcu/tree.c:1957 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2130 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 32643 Comm: syz-executor.1 Not tainted 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:vmx_vmexit+0x0/0x10 arch/x86/kvm/vmx/vmenter.S:92 Code: b4 cc cc cc cc cc cc cc cc cc 74 04 0f 01 c3 c3 0f 01 c2 c3 80 3c 25 40 bc ed 8e 00 74 01 c3 0f 0b 66 0f 1f 84 00 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 57 RSP: 0018:ffffc9000ae5fa58 EFLAGS: 00000002 RAX: 00000000000000b8 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000000004c3 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f1f86d79700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000821d6000 CR4: 00000000003526f0 Call Trace: __vmx_vcpu_run+0x60/0xe0 arch/x86/kvm/vmx/vmenter.S:158 NMI backtrace for cpu 1 CPU: 1 PID: 32645 Comm: syz-executor.2 Not tainted 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline] check_cpu_stall kernel/rcu/tree_stall.h:711 [inline] rcu_pending kernel/rcu/tree.c:3880 [inline] rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2599 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:rcu_preempt_read_enter kernel/rcu/tree_plugin.h:375 [inline] RIP: 0010:__rcu_read_lock+0x73/0xf0 kernel/rcu/tree_plugin.h:398 Code: 03 00 00 8b 9b d4 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c3 01 83 c0 03 <38> d0 7c 04 84 d2 75 58 48 b8 00 00 00 00 00 fc ff df 89 9d d4 03 RSP: 0018:ffffc9000aea6fa8 EFLAGS: 00000202 RAX: 0000000000000007 RBX: 0000000000000001 RCX: ffff8880738dcb94 RDX: 0000000000000000 RSI: ffffffff819a3745 RDI: ffff888091652714 RBP: ffff888091652340 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81ab93dd R11: 0000000000000000 R12: ffff8880188b2b98 R13: 0000000000000000 R14: ffffc9000aea7190 R15: 0000000020000000 rcu_read_lock include/linux/rcupdate.h:685 [inline] filemap_map_pages+0x18d/0x1880 mm/filemap.c:3298 do_fault_around mm/memory.c:4152 [inline] do_read_fault mm/memory.c:4167 [inline] do_fault mm/memory.c:4301 [inline] handle_pte_fault mm/memory.c:4559 [inline] __handle_mm_fault+0x28dd/0x5320 mm/memory.c:4694 handle_mm_fault+0x1c8/0x790 mm/memory.c:4792 faultin_page mm/gup.c:937 [inline] __get_user_pages+0x503/0xf80 mm/gup.c:1158 __get_user_pages_locked mm/gup.c:1343 [inline] get_user_pages_unlocked+0x1b3/0x760 mm/gup.c:2067 hva_to_pfn_slow arch/x86/kvm/../../../virt/kvm/kvm_main.c:2269 [inline] hva_to_pfn+0x1c1/0xdd0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2401 __gfn_to_pfn_memslot+0x229/0x420 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2460 kvm_faultin_pfn+0x3d8/0xbc0 arch/x86/kvm/mmu/mmu.c:3957 direct_page_fault+0xd22/0x2320 arch/x86/kvm/mmu/mmu.c:3992 kvm_mmu_do_page_fault arch/x86/kvm/mmu.h:127 [inline] kvm_mmu_page_fault+0x17e/0x17f0 arch/x86/kvm/mmu/mmu.c:5287 handle_ept_violation+0x29c/0x6e0 arch/x86/kvm/vmx/vmx.c:5325 __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6034 [inline] vmx_handle_exit+0x4be/0x1950 arch/x86/kvm/vmx/vmx.c:6051 vcpu_enter_guest+0x2a90/0x4410 arch/x86/kvm/x86.c:9735 vcpu_run arch/x86/kvm/x86.c:9802 [inline] kvm_arch_vcpu_ioctl_run+0x47c/0x1b10 arch/x86/kvm/x86.c:10034 kvm_vcpu_ioctl+0x570/0xf30 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3779 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fa576d688d9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa5742df188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa576e6cf60 RCX: 00007fa576d688d9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006 RBP: 00007fa576dc2cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc56a3f5df R14: 00007fa5742df300 R15: 0000000000022000 sched: RT throttling activated ---------------- Code disassembly (best guess): 0: b4 cc mov $0xcc,%ah 2: cc int3 3: cc int3 4: cc int3 5: cc int3 6: cc int3 7: cc int3 8: cc int3 9: cc int3 a: 74 04 je 0x10 c: 0f 01 c3 vmresume f: c3 retq 10: 0f 01 c2 vmlaunch 13: c3 retq 14: 80 3c 25 40 bc ed 8e cmpb $0x0,0xffffffff8eedbc40 1b: 00 1c: 74 01 je 0x1f 1e: c3 retq 1f: 0f 0b ud2 21: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) 28: 00 00 * 2a: c3 retq <-- trapping instruction 2b: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 32: 00 00 00 00 36: 0f 1f 40 00 nopl 0x0(%rax) 3a: 55 push %rbp 3b: 48 89 e5 mov %rsp,%rbp 3e: 41 57 push %r15