rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (2 ticks this GP) idle=c8dc/1/0x4000000000000000 softirq=73095/73095 fqs=0 (detected by 0, t=10502 jiffies, g=100733, q=266 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 18141 Comm: syz.1.4210 Not tainted 6.1.115-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:22 [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:lock_release+0x5ed/0xa20 kernel/locking/lockdep.c:5685 Code: 14 0c 8b e8 f5 87 3c 09 b8 ff ff ff ff 65 0f c1 05 18 b4 97 7e 83 f8 01 0f 85 94 00 00 00 4c 89 f3 48 c1 eb 03 42 80 3c 3b 00 <74> 08 4c 89 f7 e8 e9 51 77 00 48 c7 84 24 90 00 00 00 00 00 00 00 RSP: 0018:ffffc900001e0b80 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 1ffff9200003c182 RCX: ffffc900001e0c03 RDX: 0000000000000001 RSI: ffffffff8b0c1440 RDI: ffffffff8b5d7540 RBP: ffffc900001e0cb0 R08: dffffc0000000000 R09: fffffbfff1d34076 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200003c17c R13: 0000000000000046 R14: ffffc900001e0c10 R15: dffffc0000000000 FS: 00007f2e58be26c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2e58be1f98 CR3: 000000005d98f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x75/0x130 kernel/locking/spinlock.c:194 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x4b0/0xe50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x158/0x5b0 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:lockdep_unregister_key+0x562/0x600 kernel/locking/lockdep.c:6367 Code: 1e 91 48 c7 c6 20 ea 6a 81 e8 0a b4 08 00 e8 45 c8 08 00 e9 ea fb ff ff e8 bb 49 3c 09 41 f7 c7 00 02 00 00 74 d0 fb 45 84 f6 <75> cf eb e0 0f 0b 45 31 f6 e9 64 ff ff ff 0f 0b e9 a5 fe ff ff 0f RSP: 0018:ffffc9000329ef80 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 1ffff92000653df8 RCX: ffffffff97337103 RDX: 0000000000000001 RSI: ffffffff8b0c0fa0 RDI: ffffffff8b5d7540 RBP: ffffc9000329f048 R08: dffffc0000000000 R09: fffffbfff223c497 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000329efc0 R13: 1ffff92000653df4 R14: 0000000000000000 R15: 0000000000000206 __qdisc_destroy+0x127/0x450 net/sched/sch_generic.c:1078 taprio_attach+0x260/0x420 net/sched/sch_taprio.c:1844 qdisc_graft+0x12e5/0x1610 net/sched/sch_api.c:1143 tc_modify_qdisc+0xf29/0x1d70 net/sched/sch_api.c:1767 rtnetlink_rcv_msg+0x818/0xff0 net/core/rtnetlink.c:6150 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2508 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline] netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1352 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1874 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5a5/0x8f0 net/socket.c:2519 ___sys_sendmsg net/socket.c:2573 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2602 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2e57d7e719 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2e58be2038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2e57f35f80 RCX: 00007f2e57d7e719 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 00007f2e57df139e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2e57f35f80 R15: 00007ffef7f87c98 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g100733 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=49310 rcu: rcu_preempt kthread starved for 10502 jiffies! g100733 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:25528 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5241 [inline] __schedule+0x143f/0x4570 kernel/sched/core.c:6558 schedule+0xbf/0x180 kernel/sched/core.c:6634 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 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: 18141 Comm: syz.1.4210 Not tainted 6.1.115-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__lock_acquire+0xdcd/0x1f80 Code: 84 c0 0f 85 62 0c 00 00 8b 1b 48 8b 44 24 30 0f b6 04 38 84 c0 0f 85 76 0c 00 00 48 8b 44 24 08 33 18 f7 c3 00 60 00 00 74 0d <41> bd 01 00 00 00 49 c7 c7 ff ff ff ff 48 8b 44 24 30 0f b6 04 38 RSP: 0018:ffffc900001e0a60 EFLAGS: 00000006 RAX: ffff88802778c6a8 RBX: 0000000000084c36 RCX: ffff88802778c660 RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000 RBP: ffff88802778c688 R08: dffffc0000000000 R09: fffffbfff224607e R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88802778c658 R13: 0000000000000000 R14: ffff88802778c6a8 R15: fb268dbe5ff7dd64 FS: 00007f2e58be26c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2e58be1f98 CR3: 000000005d98f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0x47/0x970 net/sched/sch_taprio.c:700 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x158/0x5b0 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:lockdep_unregister_key+0x562/0x600 kernel/locking/lockdep.c:6367 Code: 1e 91 48 c7 c6 20 ea 6a 81 e8 0a b4 08 00 e8 45 c8 08 00 e9 ea fb ff ff e8 bb 49 3c 09 41 f7 c7 00 02 00 00 74 d0 fb 45 84 f6 <75> cf eb e0 0f 0b 45 31 f6 e9 64 ff ff ff 0f 0b e9 a5 fe ff ff 0f RSP: 0018:ffffc9000329ef80 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 1ffff92000653df8 RCX: ffffffff97337103 RDX: 0000000000000001 RSI: ffffffff8b0c0fa0 RDI: ffffffff8b5d7540 RBP: ffffc9000329f048 R08: dffffc0000000000 R09: fffffbfff223c497 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000329efc0 R13: 1ffff92000653df4 R14: 0000000000000000 R15: 0000000000000206 __qdisc_destroy+0x127/0x450 net/sched/sch_generic.c:1078 taprio_attach+0x260/0x420 net/sched/sch_taprio.c:1844 qdisc_graft+0x12e5/0x1610 net/sched/sch_api.c:1143 tc_modify_qdisc+0xf29/0x1d70 net/sched/sch_api.c:1767 rtnetlink_rcv_msg+0x818/0xff0 net/core/rtnetlink.c:6150 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2508 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline] netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1352 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1874 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5a5/0x8f0 net/socket.c:2519 ___sys_sendmsg net/socket.c:2573 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2602 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2e57d7e719 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2e58be2038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2e57f35f80 RCX: 00007f2e57d7e719 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 00007f2e57df139e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2e57f35f80 R15: 00007ffef7f87c98