rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=121289, q=81) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295021802-4295011300), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g121289 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:28952 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb44/0x5960 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: 31678 Comm: syz-executor.0 Not tainted 5.15.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_release kernel/locking/lockdep.c:5338 [inline] RIP: 0010:lock_release+0x310/0x720 kernel/locking/lockdep.c:5645 Code: 85 aa 03 00 00 49 8d bf 10 0a 00 00 48 8b 1b 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 a6 03 00 00 <41> 8d 45 ff 49 89 9f 10 0a 00 00 44 39 e0 0f 84 8b 00 00 00 48 8d RSP: 0018:ffffc90000007b20 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 9e4dc7ce36f43230 RCX: ffffc90000007b70 RDX: 1ffff11006fed99a RSI: 0000000000000000 RDI: ffff888037f6ccd0 RBP: 1ffff92000000f66 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000004 R14: ffff888037f6ccd8 R15: ffff888037f6c2c0 FS: 00007f8525cf4700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000095fb8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] timekeeping_get_delta kernel/time/timekeeping.c:252 [inline] timekeeping_get_ns kernel/time/timekeeping.c:386 [inline] ktime_get+0x158/0x470 kernel/time/timekeeping.c:829 hrtimer_forward_now include/linux/hrtimer.h:506 [inline] perf_swevent_hrtimer+0x246/0x3f0 kernel/events/core.c:10572 __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:lock_release+0x3f1/0x720 kernel/locking/lockdep.c:5633 Code: 7e 83 f8 01 0f 85 8d 01 00 00 9c 58 f6 c4 02 0f 85 78 01 00 00 48 f7 04 24 00 02 00 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c5 48 c7 45 00 00 00 00 00 c7 45 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc9001709eef8 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 9e4dc7ce36f43230 RCX: ffffc9001709ef48 RDX: 1ffff11006fed99a RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff92002e13de1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000004 R14: ffff888037f6ccd8 R15: ffff888037f6c2c0 rcu_lock_release include/linux/rcupdate.h:272 [inline] rcu_read_unlock include/linux/rcupdate.h:720 [inline] filemap_map_pages+0x803/0x1880 mm/filemap.c:3340 do_fault_around mm/memory.c:4161 [inline] do_read_fault mm/memory.c:4176 [inline] do_fault mm/memory.c:4310 [inline] handle_pte_fault mm/memory.c:4568 [inline] __handle_mm_fault+0x28dd/0x5320 mm/memory.c:4703 handle_mm_fault+0x1c8/0x790 mm/memory.c:4801 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:6038 [inline] vmx_handle_exit+0x4be/0x1950 arch/x86/kvm/vmx/vmx.c:6055 vcpu_enter_guest+0x2a90/0x4410 arch/x86/kvm/x86.c:9752 vcpu_run arch/x86/kvm/x86.c:9819 [inline] kvm_arch_vcpu_ioctl_run+0x47c/0x1b10 arch/x86/kvm/x86.c:10051 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: 0033:0x7f852877eae9 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:00007f8525cf4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8528891f60 RCX: 00007f852877eae9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 00007f85287d8f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc22bb10ff R14: 00007f8525cf4300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 85 aa 03 00 00 49 test %ebp,0x49000003(%rdx) 6: 8d bf 10 0a 00 00 lea 0xa10(%rdi),%edi c: 48 8b 1b mov (%rbx),%rbx f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 16: fc ff df 19: 48 89 fa mov %rdi,%rdx 1c: 48 c1 ea 03 shr $0x3,%rdx 20: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 24: 0f 85 a6 03 00 00 jne 0x3d0 * 2a: 41 8d 45 ff lea -0x1(%r13),%eax <-- trapping instruction 2e: 49 89 9f 10 0a 00 00 mov %rbx,0xa10(%r15) 35: 44 39 e0 cmp %r12d,%eax 38: 0f 84 8b 00 00 00 je 0xc9 3e: 48 rex.W 3f: 8d .byte 0x8d