rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 ticks this GP) idle=7374/1/0x4000000000000000 softirq=5521/5521 fqs=0 rcu: (detected by 1, t=10502 jiffies, g=6589, q=97 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5076 Comm: syz-executor391 Not tainted 6.8.0-rc4-syzkaller-00410-gc02197fc9076 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1718 [inline] RIP: 0010:__hrtimer_run_queues+0x735/0xd00 kernel/time/hrtimer.c:1753 Code: 73 00 4c 39 33 75 4f e8 39 97 11 00 4c 8b 74 24 40 48 8b 44 24 60 42 80 3c 28 00 48 8b 5c 24 18 74 08 48 89 df e8 6b b5 73 00 <48> c7 03 00 00 00 00 43 80 3c 2c 00 74 08 4c 89 f7 e8 65 b4 73 00 RSP: 0018:ffffc90000007d60 EFLAGS: 00000046 RAX: 1ffff11017285769 RBX: ffff8880b942bb48 RCX: ffff88802c6b1dc0 RDX: 0000000080010203 RSI: 1ffff11017285762 RDI: ffff88802a7e3340 RBP: ffffc90000007ea8 R08: ffff88802a7e3357 R09: 0000000000000000 R10: ffff88802a7e3340 R11: ffffed10054fc66b R12: 1ffff1101728576b R13: dffffc0000000000 R14: ffff8880b942bb58 R15: ffff8880b942ba00 FS: 0000555556b05380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556b05650 CR3: 0000000028fa6000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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 fe 18 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 db f2 f5 65 8b 05 94 4e 92 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc90003d2ea60 EFLAGS: 00000206 RAX: 6df56a20e028e700 RBX: 1ffff920007a5d50 RCX: ffffffff817187da RDX: dffffc0000000000 RSI: ffffffff8baab5e0 RDI: 0000000000000001 RBP: ffffc90003d2eaf0 R08: ffffffff92c8c4e7 R09: 1ffffffff259189c R10: dffffc0000000000 R11: fffffbfff259189d R12: dffffc0000000000 R13: 1ffff920007a5d4c R14: ffffc90003d2ea80 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] taprio_change+0x4912/0x57d0 net/sched/sch_taprio.c:1993 taprio_init+0x9da/0xc80 net/sched/sch_taprio.c:2134 qdisc_create+0x9d4/0x1190 net/sched/sch_api.c:1355 tc_modify_qdisc+0xa26/0x1e40 net/sched/sch_api.c:1776 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: 0033:0x7f84823bcde9 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:00007ffe2b532198 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f84823bcde9 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000100000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe2b5321f0 R13: 0000000000000001 R14: 00007ffe2b5321f0 R15: 0000000000000003 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.211 msecs rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g6589 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=1889 rcu: rcu_preempt kthread starved for 10502 jiffies! g6589 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