rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=ca2/1/0x4000000000000004 softirq=13354/13359 fqs=2 (t=10502 jiffies g=8917 q=1959) rcu: rcu_preempt kthread starved for 10499 jiffies! g8917 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29296 11 2 0x80004000 Call Trace: schedule+0xc1/0x260 kernel/sched/core.c:4145 schedule_timeout+0x3fa/0xe80 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1639 [inline] rcu_gp_kthread+0xa43/0x1a90 kernel/rcu/tree.c:1799 kthread+0x31d/0x3e0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 12472 Comm: syz-executor.1 Not tainted 5.4.0-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+0x96/0xe0 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.6+0x2e/0x33 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x183/0x1ac lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x201/0x24f kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2795 [inline] rcu_sched_clock_irq.cold.98+0x517/0xe43 kernel/rcu/tree.c:2244 update_process_times+0x1f/0x50 kernel/time/timer.c:1726 tick_sched_handle+0x6f/0x130 kernel/time/tick-sched.c:167 tick_sched_timer+0x3e/0xf0 kernel/time/tick-sched.c:1299 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x297/0xa40 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x314/0x800 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x18d/0x690 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:163 [inline] RIP: 0010:unwind_next_frame+0x259/0x1ef0 arch/x86/kernel/unwind_orc.c:404 Code: 56 ff 39 d0 0f 83 a3 13 00 00 48 ba 00 00 00 00 00 fc ff df 89 c6 48 8d 3c b5 68 d1 30 8d 49 89 f8 49 c1 e8 03 45 0f b6 04 10 <48> 89 fa 83 e2 07 83 c2 03 44 38 c2 7c 28 45 84 c0 74 23 48 89 74 RSP: 0018:ffff8880b9e09628 EFLAGS: 00000217 ORIG_RAX: ffffffffffffff13 RAX: 0000000000005867 RBX: 1ffff110173c12ce RCX: ffffffff81586716 RDX: dffffc0000000000 RSI: 0000000000005867 RDI: ffffffff8d323304 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000001 R10: ffffed10173c12eb R11: 00000000000c4ced R12: ffff8880b9e09750 R13: ffff8880b9e0973d R14: ffff8880b9e09758 R15: ffff8880b9e09708 arch_stack_walk+0x77/0xd0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x85/0xb0 kernel/stacktrace.c:123 save_stack+0x19/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.11+0xc1/0xd0 mm/kasan/common.c:483 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2758 [inline] slab_alloc mm/slub.c:2766 [inline] kmem_cache_alloc+0xaa/0x2a0 mm/slub.c:2771 __build_skb+0x18/0x40 net/core/skbuff.c:310 __netdev_alloc_skb+0x1bb/0x420 net/core/skbuff.c:463 netdev_alloc_skb include/linux/skbuff.h:2779 [inline] dev_alloc_skb include/linux/skbuff.h:2792 [inline] __ieee80211_beacon_get+0x1117/0x1a40 net/mac80211/tx.c:4514 ieee80211_beacon_get_tim+0x84/0x770 net/mac80211/tx.c:4625 ieee80211_beacon_get include/net/mac80211.h:4728 [inline] mac80211_hwsim_beacon_tx+0xcb/0x650 drivers/net/wireless/mac80211_hwsim.c:1556 __iterate_interfaces+0xe4/0x390 net/mac80211/util.c:738 ieee80211_iterate_active_interfaces_atomic+0x72/0x120 net/mac80211/util.c:774 mac80211_hwsim_beacon+0xc5/0x190 drivers/net/wireless/mac80211_hwsim.c:1592 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x297/0xa40 kernel/time/hrtimer.c:1576 hrtimer_run_softirq+0x196/0x2b0 kernel/time/hrtimer.c:1593 __do_softirq+0x24a/0xa97 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x167/0x190 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1d0/0x690 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:lock_acquire+0x171/0x360 kernel/locking/lockdep.c:4491 Code: c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 c5 01 00 00 c7 83 94 08 00 00 00 00 00 00 ff 34 24 9d <48> 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b 15 f9 82 b2 7e RSP: 0018:ffff8880b416fa30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff8880b44d4a40 RCX: ffffffff814ec613 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880b44d52d4 RBP: 0000000000000000 R08: 0000000000002189 R09: fffffbfff1bd9b4a R10: fffffbfff1bd9b49 R11: ffff8880b44d4a40 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] futex_wake+0x179/0x490 kernel/futex.c:1616 do_futex+0x554/0x1600 kernel/futex.c:3649 __do_sys_futex kernel/futex.c:3705 [inline] __se_sys_futex kernel/futex.c:3673 [inline] __x64_sys_futex+0x269/0x320 kernel/futex.c:3673 do_syscall_64+0x8e/0x4e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465d99 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:00007ff8ae4e7218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000056bf68 RCX: 0000000000465d99 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000056bf6c RBP: 000000000056bf60 R08: 000000000000000e R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf6c R13: 00007ffcded2718f R14: 00007ff8ae4e7300 R15: 0000000000022000