rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 ticks this GP) idle=fb14/1/0x4000000000000000 softirq=5869/5869 fqs=0 rcu: (detected by 1, t=10502 jiffies, g=6717, q=83 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5074 Comm: syz-executor282 Not tainted 6.8.0-rc5-syzkaller-00029-g39133352cbed #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:__lock_acquire+0xc26/0x1fd0 kernel/locking/lockdep.c:5107 Code: 48 89 ee ba 08 00 00 00 e8 97 5f 00 00 85 c0 0f 84 64 05 00 00 48 c7 c0 c0 43 48 94 48 c1 e8 03 48 bf 00 00 00 00 00 fc ff df <0f> b6 04 38 84 c0 0f 85 aa 0c 00 00 83 3d a7 1a d7 12 00 75 39 48 RSP: 0018:ffffc90000007910 EFLAGS: 00000806 RAX: 1ffffffff2890878 RBX: ffffffff92977846 RCX: ffffffff8171891a RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000 RBP: ffff88802d07e478 R08: ffffffff92c8c427 R09: 1ffffffff2591884 R10: dffffc0000000000 R11: fffffbfff2591885 R12: 0000000000000001 R13: ffff88802d07d940 R14: 1ffff11005a0fc93 R15: ffff88802d07e498 FS: 00005555559cf380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000600 CR3: 000000001ec14000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 debug_object_activate+0x16d/0x510 lib/debugobjects.c:708 debug_hrtimer_activate kernel/time/hrtimer.c:422 [inline] debug_activate kernel/time/hrtimer.c:477 [inline] enqueue_hrtimer+0x30/0x3a0 kernel/time/hrtimer.c:1087 __run_hrtimer kernel/time/hrtimer.c:1706 [inline] __hrtimer_run_queues+0x6b4/0xd00 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x107/0x3a0 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_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 3e 1a 84 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 f3 dc f2 f5 65 8b 05 94 4e 92 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc90003abeca0 EFLAGS: 00000206 RAX: 6223e18b3a7db000 RBX: 1ffff92000757d98 RCX: ffffffff8171891a RDX: dffffc0000000000 RSI: ffffffff8baab660 RDI: 0000000000000001 RBP: ffffc90003abed30 R08: ffffffff92c8c4e7 R09: 1ffffffff259189c R10: dffffc0000000000 R11: fffffbfff259189d R12: dffffc0000000000 R13: 1ffff92000757d94 R14: ffffc90003abecc0 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] taprio_change+0x4912/0x57d0 net/sched/sch_taprio.c:1993 qdisc_change net/sched/sch_api.c:1416 [inline] tc_modify_qdisc+0x190d/0x1e40 net/sched/sch_api.c:1746 rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6618 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f6af86dcc29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff4b56d048 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f6af86dcc29 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000006 RBP: 00000000000f4240 R08: 0000000100000000 R09: 0000000100000000 R10: 0000000100000000 R11: 0000000000000246 R12: 00007fff4b56d0a0 R13: 0000000000000001 R14: 00007fff4b56d0a0 R15: 0000000000000003 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.723 msecs rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g6717 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=2020 rcu: rcu_preempt kthread starved for 10502 jiffies! g6717 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:24656 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+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242