rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=236/1/0x4000000000000000 softirq=112678/112679 fqs=0 (t=10501 jiffies g=212465 q=60) rcu: rcu_preempt kthread starved for 10502 jiffies! g212465 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: rcu_preempt I29112 10 2 0x00004000 Call Trace: context_switch kernel/sched/core.c:3458 [inline] __schedule+0x8ea/0x2210 kernel/sched/core.c:4219 schedule+0xd0/0x2a0 kernel/sched/core.c:4294 schedule_timeout+0x148/0x250 kernel/time/timer.c:1916 rcu_gp_fqs_loop kernel/rcu/tree.c:1874 [inline] rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2044 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 NMI backtrace for cpu 1 CPU: 1 PID: 4264 Comm: syz-executor.3 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:320 print_cpu_stall kernel/rcu/tree_stall.h:553 [inline] check_cpu_stall kernel/rcu/tree_stall.h:627 [inline] rcu_pending kernel/rcu/tree.c:3489 [inline] rcu_sched_clock_irq.cold+0x5b3/0xccc kernel/rcu/tree.c:2504 update_process_times+0x25/0xa0 kernel/time/timer.c:1738 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x108/0x290 kernel/time/tick-sched.c:1320 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] sysvec_apic_timer_interrupt+0x4f/0x120 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x8c/0xe0 kernel/locking/spinlock.c:191 Code: 48 c7 c0 88 e0 b4 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 37 48 83 3d e3 f2 c9 01 00 74 22 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 35 85 64 f9 65 8b 05 fe 10 17 78 RSP: 0018:ffffc90000da8ca0 EFLAGS: 00000286 RAX: 1ffffffff1369c11 RBX: 0000000000000286 RCX: 0000000000000002 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000286 RBP: ffff88809a951d08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88809a951d48 R13: ffff88809e121400 R14: ffffffff864f0670 R15: dffffc0000000000 mrp_pdu_queue+0x238/0x350 net/802/mrp.c:342 mrp_join_timer+0x73/0xc0 net/802/mrp.c:592 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1416 expire_timers kernel/time/timer.c:1461 [inline] __run_timers.part.0+0x54c/0xa20 kernel/time/timer.c:1792 __run_timers kernel/time/timer.c:1764 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1805 __do_softirq+0x34c/0xa60 kernel/softirq.c:292 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x111/0x170 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:387 [inline] __irq_exit_rcu kernel/softirq.c:417 [inline] irq_exit_rcu+0x229/0x270 kernel/softirq.c:429 sysvec_apic_timer_interrupt+0x54/0x120 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585 RIP: 0010:__purge_vmap_area_lazy+0x1b6/0x1f20 mm/vmalloc.c:1372 Code: 06 e8 be 38 cb ff 48 8b 04 24 48 83 c0 38 48 89 44 24 28 48 c1 e8 03 42 80 3c 38 00 0f 85 63 18 00 00 48 8b 04 24 48 8b 48 38 <48> 8d 78 08 48 89 f8 48 c1 e8 03 48 89 4c 24 08 48 83 e9 38 42 80 RSP: 0018:ffffc900194f7760 EFLAGS: 00000246 RAX: ffff8880a72a8000 RBX: 000000000000287b RCX: ffff8880a0ef56f8 RDX: 0000000000040000 RSI: ffffffff81a88452 RDI: 0000000000000000 RBP: ffffc9000d149000 R08: 0000000000000001 R09: ffffffff89c6adc0 R10: fffffbfff138d5b8 R11: 0000000000000000 R12: 0000000000000000 R13: ffffc9000d149000 R14: 0000000000008000 R15: dffffc0000000000 _vm_unmap_aliases.part.0+0x3cc/0x4d0 mm/vmalloc.c:1800 _vm_unmap_aliases mm/vmalloc.c:1774 [inline] vm_unmap_aliases+0x42/0x50 mm/vmalloc.c:1823 change_page_attr_set_clr+0x241/0x500 arch/x86/mm/pat/set_memory.c:1732 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1789 [inline] set_memory_ro+0x78/0xa0 arch/x86/mm/pat/set_memory.c:1935 bpf_jit_binary_lock_ro include/linux/filter.h:815 [inline] bpf_int_jit_compile+0xd84/0x110c arch/x86/net/bpf_jit_comp.c:1929 bpf_prog_select_runtime+0x591/0xb00 kernel/bpf/core.c:1807 bpf_prog_load+0xdda/0x1b50 kernel/bpf/syscall.c:2198 __do_sys_bpf+0x1edf/0x4b10 kernel/bpf/syscall.c:4117 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cce9 Code: 2d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd1f35bac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000001c00 RCX: 000000000045cce9 RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffc4cae3f4f R14: 00007fd1f35bb9c0 R15: 000000000078bf0c