rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11424/1:b..l P13849/1:b..l (detected by 1, t=10503 jiffies, g=447829, q=5965) task:syz-executor.5 state:R running task stack:23832 pid:17585 ppid: 1 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5307 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 __raw_read_unlock include/linux/rwlock_api_smp.h:227 [inline] _raw_read_unlock+0x36/0x40 kernel/locking/spinlock.c:255 zap_pid_ns_processes+0x29a/0x680 kernel/pid_namespace.c:206 find_child_reaper kernel/exit.c:543 [inline] forget_original_parent kernel/exit.c:632 [inline] exit_notify kernel/exit.c:669 [inline] do_exit+0x238b/0x2a60 kernel/exit.c:846 do_group_exit+0x125/0x310 kernel/exit.c:923 get_signal+0x47f/0x2150 kernel/signal.c:2835 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789 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+0x171/0x280 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x464bcb RSP: 002b:0000000000a9fd50 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: fffffffffffffff4 RBX: 0000000000000000 RCX: 0000000000464bcb RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 00000000027c1400 R10: 00000000027c16d0 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000a9fe40 task:kworker/u4:4 state:R running task stack:25984 pid:13849 ppid: 2 flags:0x00004000 Workqueue: phy49 ieee80211_iface_work Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5307 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 __local_bh_enable_ip+0x109/0x120 kernel/softirq.c:391 ieee80211_tx_skb_tid.constprop.0+0x131/0x330 net/mac80211/ieee80211_i.h:2021 ieee80211_tx_skb net/mac80211/ieee80211_i.h:2030 [inline] ieee80211_send_deauth_disassoc+0x2ec/0x3e0 net/mac80211/util.c:1739 ieee80211_ibss_sta_expire net/mac80211/ibss.c:1279 [inline] ieee80211_sta_merge_ibss net/mac80211/ibss.c:1305 [inline] ieee80211_ibss_work+0x61d/0xe80 net/mac80211/ibss.c:1711 ieee80211_iface_work+0x893/0x9e0 net/mac80211/iface.c:1463 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276 worker_thread+0x64c/0x1120 kernel/workqueue.c:2422 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 task:syz-executor.2 state:X running task stack:28024 pid:11424 ppid: 0 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5535 irqentry_exit+0x31/0x80 kernel/entry/common.c:426 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x70 kernel/kcov.c:285 Code: 44 30 e0 03 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 41 89 f8 bf 03 00 00 00 <4c> 8b 14 24 89 f1 65 48 8b 34 25 00 f0 01 00 e8 f4 ef ff ff 84 c0 RSP: 0018:ffffc900140279b0 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff888159a19c40 RSI: 0000000000000001 RDI: 0000000000000003 RBP: ffff88803546c2f0 R08: 0000000000000000 R09: ffff88803546c383 R10: ffffed1006a8d870 R11: 0000000000000000 R12: ffff88803546c380 R13: ffffffff81cb7f55 R14: 0000000000000027 R15: ffff8880299fc048 rcu_read_unlock include/linux/rcupdate.h:707 [inline] dput+0x19b/0xbc0 fs/dcache.c:876 proc_invalidate_siblings_dcache+0x443/0x600 fs/proc/inode.c:151 release_task+0xc89/0x1690 kernel/exit.c:223 exit_notify kernel/exit.c:700 [inline] do_exit+0x1518/0x2a60 kernel/exit.c:846 do_group_exit+0x125/0x310 kernel/exit.c:923 get_signal+0x47f/0x2150 kernel/signal.c:2835 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789 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+0x171/0x280 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f5aceeb4218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056bf88 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88 RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c R13: 0000000000a9fb1f R14: 00007f5aceeb4300 R15: 0000000000022000 rcu: rcu_preempt kthread timer wakeup didn't happen for 703 jiffies! g447829 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=171254 rcu: rcu_preempt kthread starved for 706 jiffies! g447829 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: task:rcu_preempt state:I stack:28704 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892 rcu_gp_fqs_loop kernel/rcu/tree.c:2004 [inline] rcu_gp_kthread+0xd07/0x2300 kernel/rcu/tree.c:2177 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 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: 6119 Comm: syz-executor.5 Not tainted 5.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5255 [inline] RIP: 0010:lock_is_held_type+0xa7/0x140 kernel/locking/lockdep.c:5555 Code: 12 e9 88 00 00 00 83 c3 01 41 3b 9c 24 f0 09 00 00 7d 7b 48 63 c3 48 89 ee 48 8d 04 80 4d 8d 7c c5 00 4c 89 ff e8 09 fe ff ff <85> c0 74 d8 41 83 fe ff 41 bd 01 00 00 00 74 12 41 0f b6 47 22 45 RSP: 0018:ffffc90000007d38 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8bf79260 RDI: ffff888149b089f8 RBP: ffffffff8bf79260 R08: 0000000000000000 R09: ffffffff8dc96497 R10: fffffbfff1b92c92 R11: 0000000000000000 R12: ffff888149b08000 R13: ffff888149b089f8 R14: 00000000ffffffff R15: ffff888149b089f8 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f57cfd61dc0 CR3: 00000000275bf000 CR4: 00000000001506f0 DR0: 00000000000000ff DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x5e9/0x740 kernel/locking/lockdep.c:5483 seqcount_lockdep_reader_access include/linux/seqlock.h:103 [inline] ktime_get+0x7c/0x470 kernel/time/timekeeping.c:827 clockevents_program_event+0x141/0x370 kernel/time/clockevents.c:326 tick_program_event+0xac/0x140 kernel/time/tick-oneshot.c:44 hrtimer_interrupt+0x414/0xa00 kernel/time/hrtimer.c:1676 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+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:__tlb_remove_page_size+0x2/0x420 mm/mmu_gather.c:67 Code: 5f e9 02 1b 04 00 4c 89 ff e8 ca 95 0d 00 e9 6c ff ff ff 4c 89 ff e8 bd 95 0d 00 eb bd e8 c6 95 0d 00 eb 9c 0f 1f 40 00 41 57 <41> 56 49 89 f6 41 55 41 54 55 53 48 89 fb e8 2b 94 c8 ff 48 8d 7b RSP: 0018:ffffc9001a8af770 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 00000000000003df RCX: 0000000000000000 RDX: 0000000000001000 RSI: ffffea00029925c0 RDI: ffffc9001a8afa48 RBP: ffffea00029925c0 R08: 0000000000000000 R09: ffffea00029925f3 R10: ffffffff81a8ca28 R11: 0000000000000000 R12: ffffea00029925f0 R13: ffff8881766a6758 R14: dffffc0000000000 R15: 00007fbc9b6ec000 __tlb_remove_page include/asm-generic/tlb.h:440 [inline] zap_pte_range mm/memory.c:1273 [inline] zap_pmd_range mm/memory.c:1374 [inline] zap_pud_range mm/memory.c:1403 [inline] zap_p4d_range mm/memory.c:1424 [inline] unmap_page_range+0xea7/0x2650 mm/memory.c:1445 unmap_single_vma+0x198/0x300 mm/memory.c:1490 unmap_vmas+0x16d/0x2f0 mm/memory.c:1522 exit_mmap+0x2a8/0x590 mm/mmap.c:3208 __mmput+0x122/0x470 kernel/fork.c:1096 mmput+0x58/0x60 kernel/fork.c:1117 exit_mm kernel/exit.c:502 [inline] do_exit+0xb0a/0x2a60 kernel/exit.c:813 do_group_exit+0x125/0x310 kernel/exit.c:923 get_signal+0x47f/0x2150 kernel/signal.c:2835 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789 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+0x171/0x280 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 Code: Unable to access opcode bytes at RIP 0x4665af. RSP: 002b:00007fbc9ad47218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056bf88 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88 RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c R13: 0000000000a9fb1f R14: 00007fbc9ad47300 R15: 0000000000022000