rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5214/1:b..l P6090/1:b..l rcu: (detected by 0, t=10502 jiffies, g=10417, q=1061 ncpus=2) task:syz.3.158 state:R running task stack:25584 pid:6090 tgid:6085 ppid:5211 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_release+0x658/0xa30 kernel/locking/lockdep.c:5784 Code: 3c 3b 00 74 08 4c 89 f7 e8 05 af 87 00 f6 84 24 91 00 00 00 02 75 77 41 f7 c5 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 27 00 00 00 00 4b c7 44 27 08 00 00 00 00 65 48 8b 04 25 RSP: 0018:ffffc900178b73e0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92002f16e8e RCX: ffffc900178b7403 RDX: 0000000000000001 RSI: ffffffff8beae6e0 RDI: ffffffff8c3f99c0 RBP: ffffc900178b7510 R08: ffffffff8ff6c86f R09: 1ffffffff1fed90d R10: dffffc0000000000 R11: fffffbfff1fed90e R12: 1ffff92002f16e88 R13: 0000000000000246 R14: ffffc900178b7470 R15: dffffc0000000000 rcu_lock_release include/linux/rcupdate.h:336 [inline] rcu_read_unlock include/linux/rcupdate.h:869 [inline] do_fault_around mm/memory.c:5022 [inline] do_read_fault mm/memory.c:5052 [inline] do_fault mm/memory.c:5191 [inline] do_pte_missing mm/memory.c:3947 [inline] handle_pte_fault+0x312e/0x6fc0 mm/memory.c:5521 __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0xf70/0x1880 mm/memory.c:5832 faultin_page mm/gup.c:1194 [inline] __get_user_pages+0x6ec/0x16a0 mm/gup.c:1493 populate_vma_page_range+0x264/0x330 mm/gup.c:1932 __mm_populate+0x27a/0x460 mm/gup.c:2035 mm_populate include/linux/mm.h:3426 [inline] vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:593 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff1bdb79e79 RSP: 002b:00007ff1be8a6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007ff1bdd16058 RCX: 00007ff1bdb79e79 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 00007ff1bdbe793e R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff1bdd16058 R15: 00007fff79a26908 task:syz-executor state:R running task stack:19920 pid:5214 tgid:5214 ppid:5210 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6708 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6732 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] copy_pte_range mm/memory.c:1191 [inline] copy_pmd_range+0x7ad5/0x8500 mm/memory.c:1252 copy_pud_range mm/memory.c:1289 [inline] copy_p4d_range mm/memory.c:1313 [inline] copy_page_range+0x99f/0xe90 mm/memory.c:1411 dup_mmap kernel/fork.c:749 [inline] dup_mm kernel/fork.c:1672 [inline] copy_mm+0x11ea/0x1f30 kernel/fork.c:1721 copy_process+0x187c/0x3e10 kernel/fork.c:2387 kernel_clone+0x223/0x880 kernel/fork.c:2800 __do_sys_clone kernel/fork.c:2943 [inline] __se_sys_clone kernel/fork.c:2927 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2927 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb1293706d3 RSP: 002b:00007ffea6c046b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb1293706d3 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00005555742487d0 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000001bb22 R14: 000000000001b7ca R15: 00007ffea6c04840 rcu: rcu_preempt kthread starved for 10351 jiffies! g10417 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111 IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available IPVS: wlc: UDP 224.0.0.2:0 - no destination available