rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=17521, q=19) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294970207-4294959705), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g17521 f0x2 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:26576 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4969 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6250 schedule+0x12b/0x1f0 kernel/sched/core.c:6323 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1955 rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2128 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 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: 10685 Comm: syz-executor.3 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mark_lock+0x21a/0x1e00 kernel/locking/lockdep.c:4612 Code: 69 00 bb 01 00 00 00 45 85 2e 0f 84 a7 00 00 00 48 c7 44 24 60 0e 36 e0 45 4b c7 04 27 00 00 00 00 4b c7 44 27 0f 00 00 00 00 <43> c6 44 27 17 00 4b c7 44 27 1f 00 00 00 00 43 c6 44 27 27 00 65 RSP: 0018:ffffc90000007900 EFLAGS: 00000006 RAX: 1ffffffff1ecfc0a RBX: 0000000000000001 RCX: ffffffff8165ef81 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fd32ee8 RBP: ffffc90000007af0 R08: dffffc0000000000 R09: fffffbfff1fa65de R10: fffffbfff1fa65de R11: 0000000000000000 R12: 1ffff92000000f2c R13: 0000000000000100 R14: ffffffff8f67e050 R15: dffffc0000000000 FS: 00007fd7ebf5b700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007b0f8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_usage kernel/locking/lockdep.c:4514 [inline] __lock_acquire+0xd38/0x2b00 kernel/locking/lockdep.c:4969 lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 hrtimer_interrupt+0x107/0x1040 kernel/time/hrtimer.c:1792 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:lock_is_held_type+0x143/0x190 Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc900040de6d8 EFLAGS: 00000206 RAX: 7260a206e134a300 RBX: 0000000000000000 RCX: 0000000000040000 RDX: ffffc9000fa49000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffffffff81bd2283 R09: fffffbfff1fa65dd R10: fffffbfff1fa65dd R11: 0000000000000000 R12: 0000000000000246 R13: ffff88801a641d00 R14: 00000000ffffffff R15: ffffffff8c943238 lock_is_held include/linux/lockdep.h:283 [inline] task_css include/linux/cgroup.h:494 [inline] mem_cgroup_from_task+0x61/0x100 mm/memcontrol.c:847 count_memcg_event_mm+0x13d/0x390 include/linux/memcontrol.h:1096 handle_mm_fault+0x136/0x2560 mm/memory.c:4783 faultin_page mm/gup.c:937 [inline] __get_user_pages+0x4da/0x11f0 mm/gup.c:1158 __get_user_pages_locked mm/gup.c:1343 [inline] get_user_pages_unlocked+0x224/0x8f0 mm/gup.c:2067 hva_to_pfn_slow+0x126/0x510 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2269 hva_to_pfn+0x233/0xbe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2401 kvm_faultin_pfn+0x366/0x900 arch/x86/kvm/mmu/mmu.c:3942 direct_page_fault+0x11f0/0x2b00 arch/x86/kvm/mmu/mmu.c:3992 kvm_mmu_do_page_fault arch/x86/kvm/mmu.h:127 [inline] kvm_mmu_page_fault+0x1a3/0x13d0 arch/x86/kvm/mmu/mmu.c:5287 vmx_handle_exit+0x26/0x160 arch/x86/kvm/vmx/vmx.c:6055 vcpu_enter_guest+0x6aa9/0x9650 arch/x86/kvm/x86.c:9633 vcpu_run+0x4d3/0xe50 arch/x86/kvm/x86.c:9700 kvm_arch_vcpu_ioctl_run+0x494/0xb20 arch/x86/kvm/x86.c:9895 kvm_vcpu_ioctl+0x894/0xe20 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+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fd7ee9e5ae9 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:00007fd7ebf5b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd7eeaf8f60 RCX: 00007fd7ee9e5ae9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006 RBP: 00007fd7eea3ff25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc059cef4f R14: 00007fd7ebf5b300 R15: 0000000000022000 sched: RT throttling activated ---------------- Code disassembly (best guess): 0: 69 00 bb 01 00 00 imul $0x1bb,(%rax),%eax 6: 00 45 85 add %al,-0x7b(%rbp) 9: 2e 0f 84 a7 00 00 00 je,pn 0xb7 10: 48 c7 44 24 60 0e 36 movq $0x45e0360e,0x60(%rsp) 17: e0 45 19: 4b c7 04 27 00 00 00 movq $0x0,(%r15,%r12,1) 20: 00 21: 4b c7 44 27 0f 00 00 movq $0x0,0xf(%r15,%r12,1) 28: 00 00 * 2a: 43 c6 44 27 17 00 movb $0x0,0x17(%r15,%r12,1) <-- trapping instruction 30: 4b c7 44 27 1f 00 00 movq $0x0,0x1f(%r15,%r12,1) 37: 00 00 39: 43 c6 44 27 27 00 movb $0x0,0x27(%r15,%r12,1) 3f: 65 gs