rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11/1:b..l (detected by 0, t=10502 jiffies, g=207877, q=71 ncpus=2) task:kworker/u4:1 state:R running task stack:23384 pid: 11 ppid: 2 flags:0x00004000 Workqueue: bat_events batadv_nc_worker Call Trace: context_switch kernel/sched/core.c:5182 [inline] __schedule+0xadf/0x52b0 kernel/sched/core.c:6494 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6806 irqentry_exit+0x31/0x80 kernel/entry/common.c:428 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0xd9/0x180 mm/kasan/generic.c:189 Code: 74 7a 80 38 00 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea eb 09 48 83 c0 01 48 39 d0 <74> 50 80 38 00 74 f2 eb d4 41 bc 08 00 00 00 48 89 ea 45 29 dc 4d RSP: 0018:ffffc90000107b78 EFLAGS: 00000246 RAX: fffffbfff1bbd98b RBX: fffffbfff1bbd98b RCX: ffffffff815f7e58 RDX: fffffbfff1bbd98b RSI: 0000000000000008 RDI: ffffffff8ddecc50 RBP: fffffbfff1bbd98a R08: 0000000000000000 R09: ffffffff8ddecc57 R10: fffffbfff1bbd98a R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff8bf89400 R15: 0000000000000000 instrument_atomic_read include/linux/instrumented.h:71 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] cpumask_test_cpu include/linux/cpumask.h:390 [inline] cpu_online include/linux/cpumask.h:965 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0xb8/0x570 kernel/locking/lockdep.c:5637 rcu_lock_acquire include/linux/rcupdate.h:280 [inline] rcu_read_lock include/linux/rcupdate.h:706 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:719 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 rcu: rcu_preempt kthread timer wakeup didn't happen for 10522 jiffies! g207877 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=207733 rcu: rcu_preempt kthread starved for 10528 jiffies! g207877 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28344 pid: 16 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5182 [inline] __schedule+0xadf/0x52b0 kernel/sched/core.c:6494 schedule+0xda/0x1b0 kernel/sched/core.c:6570 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1657 rcu_gp_kthread+0x236/0x360 kernel/rcu/tree.c:1854 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.0.0-rc4-syzkaller-00204-g9b4509495418 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 RIP: 0010:__lock_acquire+0x76/0x56d0 kernel/locking/lockdep.c:4911 Code: 00 00 90 13 5f 81 44 89 44 24 08 48 89 44 24 20 48 8d 84 24 90 00 00 00 48 c1 e8 03 48 89 44 24 30 48 01 d0 c7 00 f1 f1 f1 f1 40 04 f1 f1 04 f2 c7 40 08 00 f3 f3 f3 65 48 8b 04 25 28 00 00 RSP: 0018:ffffc900001e0b38 EFLAGS: 00000082 RAX: fffff5200003c179 RBX: 1ffff9200003c196 RCX: 0000000000000002 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff8bfb14c8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: fffffbfff1bbd98a R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8bfb14c8 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020002ec0 CR3: 000000004a39b000 CR4: 0000000000350ee0 Call Trace: lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 seqcount_lockdep_reader_access include/linux/seqlock.h:102 [inline] timekeeping_get_delta kernel/time/timekeeping.c:254 [inline] timekeeping_get_ns kernel/time/timekeeping.c:388 [inline] ktime_get_with_offset+0x1a2/0x500 kernel/time/timekeeping.c:891 alarmtimer_fired+0x123/0x5c0 kernel/time/alarmtimer.c:210 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x5fa/0xe40 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline] RIP: 0010:acpi_safe_halt+0x6f/0xb0 drivers/acpi/processor_idle.c:113 Code: f7 84 db 74 06 5b e9 10 43 f9 f7 e8 0b 43 f9 f7 e8 36 ba ff f7 eb 0c e8 ff 42 f9 f7 0f 00 2d 28 f9 d1 00 e8 f3 42 f9 f7 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 be 3f f9 f7 48 85 db RSP: 0018:ffffc90000177d20 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888011a81d80 RSI: ffffffff8982c73d RDI: 0000000000000000 RBP: ffff888017301864 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000001 R14: ffff888017301800 R15: ffff888147009004 acpi_idle_do_entry drivers/acpi/processor_idle.c:555 [inline] acpi_idle_enter+0x524/0x6a0 drivers/acpi/processor_idle.c:692 cpuidle_enter_state+0x1ab/0xd30 drivers/cpuidle/cpuidle.c:239 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:356 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:236 [inline] do_idle+0x3e8/0x590 kernel/sched/idle.c:303 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400 start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:262 secondary_startup_64_no_verify+0xce/0xdb