rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=37b/1/0x4000000000000000 softirq=153842/153843 fqs=5 (t=10502 jiffies g=262269 q=87) rcu: rcu_preempt kthread starved for 10493 jiffies! g262269 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: 29130 Comm: syz-executor.2 Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_release kernel/locking/lockdep.c:5332 [inline] RIP: 0010:lock_release+0x2e5/0x720 kernel/locking/lockdep.c:5645 Code: 04 02 84 c0 74 08 3c 03 0f 8e 7f 03 00 00 48 89 da 45 89 a7 f0 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 aa 03 00 00 49 8d bf e8 09 00 00 48 8b 1b 48 b8 00 00 00 00 RSP: 0018:ffffc90000007660 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff88808352ed48 RCX: ffffc900000076b0 RDX: 1ffff110106a5da9 RSI: 0000000000000000 RDI: ffff88808352ed6a RBP: 1ffff92000000ece R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000003 R14: ffff88808352ecf0 R15: ffff88808352e300 FS: 00007f071235d700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000008124b000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] ktime_get+0x8d/0x470 kernel/time/timekeeping.c:827 hrtimer_forward_now include/linux/hrtimer.h:506 [inline] perf_swevent_hrtimer+0x246/0x3f0 kernel/events/core.c:10546 __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+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194 Code: 74 24 10 e8 8a b4 22 f8 48 89 ef e8 d2 2a 23 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 f3 eb 16 f8 65 8b 05 8c 13 ca 76 85 c0 74 0a 5b 5d c3 e8 80 90 RSP: 0018:ffffc90000007c08 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1faac22 RDX: 0000000000000000 RSI: 0000000000000101 RDI: 0000000000000001 RBP: ffff8880b9c20240 R08: 0000000000000001 R09: ffffffff8fd00a07 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000100023cb6 R13: ffff8880b9c20240 R14: 0000000000000000 R15: 00000000ffffffff __mod_timer+0x837/0xe30 kernel/time/timer.c:1065 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:key_type_lookup security/keys/key.c:712 [inline] RIP: 0010:key_create_or_update+0x18e/0xde0 security/keys/key.c:837 Code: 98 68 ff ff ff 48 3d 80 cd 11 8c 0f 84 a4 01 00 00 e8 56 21 dc fd 48 89 d8 48 c1 e8 03 80 3c 28 00 0f 85 4f 09 00 00 48 8b 3b <4c> 89 e6 e8 0a 67 5c 00 31 ff 41 89 c7 89 c6 e8 de 29 dc fd 45 85 RSP: 0018:ffffc9000ac2fcd0 EFLAGS: 00000246 RAX: 1ffffffff1a701f4 RBX: ffffffff8d380fa0 RCX: ffffc9000dfae000 RDX: 0000000000040000 RSI: ffffffff8399219a RDI: ffffffff8aa51660 RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff8c11cccf R10: ffffffff839921c2 R11: 0000000000000000 R12: ffffc9000ac2fea8 R13: 1ffff92001585fa0 R14: ffff8880abded740 R15: 0000000000000001 __do_sys_add_key+0x215/0x430 security/keys/keyctl.c:134 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: 0033:0x7f0714e07709 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:00007f071235d188 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007f0714f0c020 RCX: 00007f0714e07709 RDX: 0000000020000700 RSI: 00000000200006c0 RDI: 0000000020000680 RBP: 00007f0714e61cb4 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000048 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffcffedb1f R14: 00007f071235d300 R15: 0000000000022000 NMI backtrace for cpu 1 CPU: 1 PID: 29129 Comm: syz-executor.0 Not tainted 5.15.0-rc2-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+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202 Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 ce b4 22 f8 48 89 ef e8 16 2b 23 f8 e8 f1 90 43 f8 fb bf 01 00 00 00 46 ec 16 f8 65 8b 05 df 13 ca 76 85 c0 74 02 5d c3 e8 fb 68 c8 RSP: 0018:ffffc90000fd8e08 EFLAGS: 00000206 RAX: 00000000007fa606 RBX: ffffffff873baf70 RCX: 1ffffffff1fa28b2 RDX: 0000000000000000 RSI: 0000000000000101 RDI: 0000000000000001 RBP: ffff8880b9d20240 R08: 0000000000000001 R09: ffffffff8fd00957 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90000fd8e98 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b9d20240 expire_timers kernel/time/timer.c:1465 [inline] __run_timers.part.0+0x665/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x8/0x70 kernel/kcov.c:292 Code: 44 30 e0 00 00 00 00 48 89 7c 30 e8 48 89 4c 30 f0 4c 89 54 d8 20 48 89 10 5b c3 0f 1f 80 00 00 00 00 49 89 f8 bf 03 00 00 00 <4c> 8b 14 24 48 89 f1 65 48 8b 34 25 40 f0 01 00 e8 b3 f1 ff ff 84 RSP: 0018:ffffc9000ac1fbb0 EFLAGS: 00000246 RAX: 1ffff92001583f7b RBX: 1ffff92001583f77 RCX: ffffc900033b9000 RDX: 0000000000040000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88809d9a0287 R10: ffffffff81a92e09 R11: 0000000000000000 R12: 00000000b1c68007 R13: 00000000200ef000 R14: 0000000000001053 R15: ffff88809c7cf000 pud_huge+0x83/0xd0 arch/x86/mm/hugetlbpage.c:73 follow_pud_mask mm/gup.c:727 [inline] follow_p4d_mask mm/gup.c:777 [inline] follow_page_mask+0x2b1/0x1520 mm/gup.c:836 __get_user_pages+0x439/0xf80 mm/gup.c:1156 populate_vma_page_range+0x24d/0x330 mm/gup.c:1490 __mm_populate+0x1ea/0x3e0 mm/gup.c:1599 do_mlock+0x28c/0x6a0 mm/mlock.c:688 __do_sys_mlock mm/mlock.c:696 [inline] __se_sys_mlock mm/mlock.c:694 [inline] __x64_sys_mlock+0x55/0x80 mm/mlock.c:694 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: 0033:0x7f15a50b2709 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:00007f15a2629188 EFLAGS: 00000246 ORIG_RAX: 0000000000000095 RAX: ffffffffffffffda RBX: 00007f15a51b6f60 RCX: 00007f15a50b2709 RDX: 0000000000000000 RSI: 0000000000800000 RDI: 00000000200e4000 RBP: 00007f15a510ccb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2457f93f R14: 00007f15a2629300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 04 02 add $0x2,%al 2: 84 c0 test %al,%al 4: 74 08 je 0xe 6: 3c 03 cmp $0x3,%al 8: 0f 8e 7f 03 00 00 jle 0x38d e: 48 89 da mov %rbx,%rdx 11: 45 89 a7 f0 09 00 00 mov %r12d,0x9f0(%r15) 18: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1f: fc ff df 22: 48 c1 ea 03 shr $0x3,%rdx 26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 2a: 0f 85 aa 03 00 00 jne 0x3da <-- trapping instruction 30: 49 8d bf e8 09 00 00 lea 0x9e8(%r15),%rdi 37: 48 8b 1b mov (%rbx),%rbx 3a: 48 rex.W 3b: b8 00 00 00 00 mov $0x0,%eax