rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P42/1:b..l rcu: (detected by 0, t=10503 jiffies, g=11789, q=668 ncpus=2) task:kworker/u4:2 state:R running task stack:22848 pid:42 tgid:42 ppid:2 flags:0x00004000 Workqueue: bat_events batadv_nc_worker Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7047 irqentry_exit+0x5e/0x90 kernel/entry/common.c:348 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:lock_acquire+0x25a/0x530 kernel/locking/lockdep.c:5758 Code: 2b 00 74 08 4c 89 f7 e8 04 75 84 00 f6 44 24 61 02 0f 85 8e 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc90000b2f9c0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92000165f44 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8baac7e0 RDI: ffffffff8bfe6da0 RBP: ffffc90000b2fb10 R08: ffffffff92c8d427 R09: 1ffffffff2591a84 R10: dffffc0000000000 R11: fffffbfff2591a85 R12: 1ffff92000165f40 R13: dffffc0000000000 R14: ffffc90000b2fa20 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:298 [inline] rcu_read_lock include/linux/rcupdate.h:750 [inline] batadv_nc_process_nc_paths+0xd6/0x3a0 net/batman-adv/network-coding.c:687 batadv_nc_worker+0x42a/0x610 net/batman-adv/network-coding.c:728 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x915/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 rcu: rcu_preempt kthread starved for 10535 jiffies! g11789 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:23864 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 schedule_timeout+0x1bd/0x310 kernel/time/timer.c:2183 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:1663 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1862 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 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: 5658 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller-g3aaa8ce7a335-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline] RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline] RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:147 [inline] RIP: 0010:wrmsr arch/x86/include/asm/msr.h:254 [inline] RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:195 Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 60 43 33 0a f3 0f 1e fa 89 f6 31 d2 e9 73 6d 9b 03 0f 1f RSP: 0018:ffffc900001f0e68 EFLAGS: 00000046 RAX: 000000000004d432 RBX: 0000000000000020 RCX: 0000000000000838 RDX: 0000000000000000 RSI: 000000000004d432 RDI: 0000000000000838 RBP: 000000000004d432 R08: ffffffff81850879 R09: 1ffffffff1f0ad85 R10: dffffc0000000000 R11: ffffffff813dad70 R12: 00000000004d426b R13: dffffc0000000000 R14: 0000000010002696 R15: ffff8880b9528340 FS: 00007fdd9db536c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdd9db52f00 CR3: 0000000029a14000 CR4: 0000000000350ef0 Call Trace: apic_write arch/x86/include/asm/apic.h:401 [inline] lapic_next_event+0x11/0x20 arch/x86/kernel/apic/apic.c:448 clockevents_program_event+0x1c3/0x350 kernel/time/clockevents.c:334 hrtimer_interrupt+0x54a/0x990 kernel/time/hrtimer.c:1828 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x109/0x3a0 arch/x86/kernel/apic/apic.c:1082 sysvec_apic_timer_interrupt+0x92/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 da 5c ff f5 48 89 df e8 92 9c 00 f6 e8 5d bc 28 f6 fb bf 01 00 00 00 62 6d f2 f5 65 8b 05 e3 dd 91 74 85 c0 74 06 5b e9 71 40 00 00 RSP: 0018:ffffc90009967c70 EFLAGS: 00000282 RAX: 7a78bd9c4bd32000 RBX: ffff888028141280 RCX: ffffffff94485303 RDX: dffffc0000000000 RSI: ffffffff8baab660 RDI: 0000000000000001 RBP: ffffc90009967db0 R08: ffffffff8f856c2f R09: 1ffffffff1f0ad85 R10: dffffc0000000000 R11: fffffbfff1f0ad86 R12: 1ffff110050282e3 R13: 000000001c000004 R14: 0000000000000021 R15: ffff888028141718 spin_unlock_irq include/linux/spinlock.h:401 [inline] get_signal+0x156d/0x1850 kernel/signal.c:2896 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc8/0x360 kernel/entry/common.c:212 do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fdd9ce7dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdd9db530c8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00007fdd9cfabf80 RCX: 00007fdd9ce7dda9 RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fdd9ceca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fdd9cfabf80 R15: 00007ffd320bad98 sched: RT throttling activated hrtimer: interrupt took 1020224749 ns