rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10287 ticks this GP) idle=7f6/1/0x4000000000000000 softirq=16675/16678 fqs=5004 (t=10500 jiffies g=18881 q=442) NMI backtrace for cpu 1 CPU: 1 PID: 11949 Comm: syz-executor.4 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x222/0x2a7 kernel/rcu/tree_stall.h:341 print_cpu_stall kernel/rcu/tree_stall.h:622 [inline] check_cpu_stall kernel/rcu/tree_stall.h:697 [inline] rcu_pending kernel/rcu/tree.c:3830 [inline] rcu_sched_clock_irq.cold+0x4f7/0x11dd kernel/rcu/tree.c:2650 update_process_times+0x16d/0x200 kernel/time/timer.c:1796 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x2e/0x50 kernel/locking/spinlock.c:191 Code: 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 ba 90 54 f8 48 89 ef e8 32 46 55 f8 80 e7 02 74 06 e8 68 a0 74 f8 fb bf 01 00 00 00 ad 41 49 f8 65 8b 05 96 56 fd 76 85 c0 74 03 5b 5d c3 e8 f1 ab RSP: 0018:ffffc90000db0ea8 EFLAGS: 00000212 RAX: 0000000001a8a670 RBX: 0000000000000246 RCX: 1ffffffff1f56cea RDX: 0000000000000000 RSI: 0000000000000103 RDI: 0000000000000001 RBP: ffff888015d194d0 R08: 0000000000000001 R09: ffffffff8faaf877 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88801960ddc0 R13: ffff888015d194d0 R14: ffff888027987dc0 R15: 0000000000000001 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] skb_dequeue+0x125/0x180 net/core/skbuff.c:3096 ieee80211_tasklet_handler+0x34/0x130 net/mac80211/main.c:228 tasklet_action_common.constprop.0+0x1d7/0x2d0 kernel/softirq.c:557 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu kernel/softirq.c:422 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:434 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:trace_rss_stat+0x1ad/0x290 include/trace/events/kmem.h:346 Code: 79 9e 5b 7e 48 c7 c0 a0 32 b2 8d 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 d8 00 00 00 48 8b 05 33 e1 0b 0c 3e e4 5b 07 31 ff 89 c3 89 c6 e8 c3 05 cd ff 85 db 74 19 e8 3a RSP: 0018:ffffc9000184f770 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff81a65140 RDI: 0000000000000003 RBP: ffff8880125b6900 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff81a65033 R11: 0000000000000000 R12: 0000000000000a00 R13: 0000000000000000 R14: dffffc0000000000 R15: 00007fb3d51f4000 mm_trace_rss_stat mm/memory.c:173 [inline] add_mm_counter include/linux/mm.h:1864 [inline] add_mm_rss_vec mm/memory.c:503 [inline] zap_pte_range mm/memory.c:1326 [inline] zap_pmd_range mm/memory.c:1380 [inline] zap_pud_range mm/memory.c:1409 [inline] zap_p4d_range mm/memory.c:1430 [inline] unmap_page_range+0x1013/0x2650 mm/memory.c:1451 unmap_single_vma+0x198/0x300 mm/memory.c:1496 unmap_vmas+0x16d/0x2f0 mm/memory.c:1528 exit_mmap+0x2a8/0x590 mm/mmap.c:3218 __mmput+0x122/0x470 kernel/fork.c:1082 mmput+0x58/0x60 kernel/fork.c:1103 exit_mm kernel/exit.c:501 [inline] do_exit+0xb6f/0x2ae0 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x42c/0x2100 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 Code: Unable to access opcode bytes at RIP 0x465ecf. RSP: 002b:00007fb3d31ae188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: 0000000000000000 RBX: 000000000056c0b0 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 00000000020a8862 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007fff6209075f R14: 00007fb3d31ae300 R15: 0000000000022000