rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (3 ticks this GP) idle=c64c/1/0x4000000000000000 softirq=8746/8746 fqs=0
	(detected by 1, t=10503 jiffies, g=7209, q=1498 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4421 Comm: syz.1.15 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:116 [inline]
RIP: 0010:lock_release+0xdc/0x910 kernel/locking/lockdep.c:5675
Code: 06 48 8d 3c dd a8 4b 1f 8e be 08 00 00 00 e8 db 78 6d 00 4c 0f a3 35 8b df bb 0c 73 0d e8 cc 99 07 00 84 c0 0f 84 29 05 00 00 <48> c7 c0 64 80 1f 8e 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 31 05
RSP: 0018:ffffc90000007b60 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 78a972f354ff7600
RDX: 0000000000000000 RSI: ffffffff8adef300 RDI: ffffffff8adef2c0
RBP: ffffc90000007c70 R08: dffffc0000000000 R09: fffffbfff1c3e976
R10: fffffbfff1c3e976 R11: 1ffffffff1c3e975 R12: ffff888054b312e8
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000000f78
FS:  00007effe121e6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558f08799168 CR3: 0000000079c35000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_lock_release include/linux/rcupdate.h:355 [inline]
 rcu_read_unlock include/linux/rcupdate.h:824 [inline]
 advance_sched+0x7fc/0x970 net/sched/sch_taprio.c:755
 __run_hrtimer kernel/time/hrtimer.c:1752 [inline]
 __hrtimer_run_queues+0x554/0xd60 kernel/time/hrtimer.c:1816
 hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1878
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa5/0x100 kernel/locking/spinlock.c:194
Code: 74 05 e8 2e e9 66 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> b6 74 37 f7 65 8b 05 87 35 e2 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc90002e86d20 EFLAGS: 00000206
RAX: 78a972f354ff7600 RBX: 0000000000000a02 RCX: 78a972f354ff7600
RDX: dffffc0000000000 RSI: ffffffff8a8c0460 RDI: 0000000000000001
RBP: ffffc90002e86db0 R08: dffffc0000000000 R09: fffffbfff215ba6a
R10: fffffbfff215ba6a R11: 1ffffffff215ba69 R12: dffffc0000000000
R13: 0000000000000a02 R14: ffff888054b312e8 R15: 1ffff920005d0da4
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 taprio_change+0x4143/0x50f0 net/sched/sch_taprio.c:1689
 qdisc_create+0x7cb/0x1090 net/sched/sch_api.c:1315
 tc_modify_qdisc+0xb2f/0x1cc0 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x79b/0xed0 net/core/rtnetlink.c:6153
 netlink_rcv_skb+0x1de/0x420 net/netlink/af_netlink.c:2511
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x89e/0xbc0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x59b/0x970 net/socket.c:2519
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x19e/0x270 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7effe038eb69
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:00007effe121e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007effe05b5fa0 RCX: 00007effe038eb69
RDX: 0000000000000000 RSI: 00002000000007c0 RDI: 0000000000000005
RBP: 00007effe0411df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007effe05b5fa0 R15: 00007fff6b3f8d38
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g7209 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=2380
rcu: rcu_preempt kthread starved for 10503 jiffies! g7209 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:26912 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4421 Comm: syz.1.15 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__lock_acquire+0x101c/0x7c50 kernel/locking/lockdep.c:-1
Code: e0 44 01 ee 41 29 c5 89 c1 c1 c1 06 44 31 e9 01 f0 89 ca c1 c2 08 29 ce 31 f2 01 c1 29 d0 41 89 d6 41 c1 c6 10 41 31 c6 01 ca <44> 89 f3 c1 c3 13 44 29 f1 31 cb 41 01 d6 29 da 41 89 dc 41 c1 c4
RSP: 0018:ffffc90000007860 EFLAGS: 00000012
RAX: 00000000850731df RBX: 0000000000000062 RCX: 0000000060b497fb
RDX: 00000000769ccfba RSI: 00000000d0c66a7a RDI: ffffffff90add240
RBP: ffffc90000007ab0 R08: dffffc0000000000 R09: fffffbfff215ba49
R10: fffffbfff215ba49 R11: 1ffffffff215ba48 R12: 000000004b09578c
R13: 00000000dd311f9c R14: 00000000b2b82437 R15: ffff88802cc846f8
FS:  00007effe121e6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558f08799168 CR3: 0000000079c35000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x63/0x340 lib/debugobjects.c:753
 debug_hrtimer_deactivate kernel/time/hrtimer.c:453 [inline]
 debug_deactivate+0x29/0x240 kernel/time/hrtimer.c:509
 __run_hrtimer kernel/time/hrtimer.c:1720 [inline]
 __hrtimer_run_queues+0x2df/0xd60 kernel/time/hrtimer.c:1816
 hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1878
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa5/0x100 kernel/locking/spinlock.c:194
Code: 74 05 e8 2e e9 66 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> b6 74 37 f7 65 8b 05 87 35 e2 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc90002e86d20 EFLAGS: 00000206
RAX: 78a972f354ff7600 RBX: 0000000000000a02 RCX: 78a972f354ff7600
RDX: dffffc0000000000 RSI: ffffffff8a8c0460 RDI: 0000000000000001
RBP: ffffc90002e86db0 R08: dffffc0000000000 R09: fffffbfff215ba6a
R10: fffffbfff215ba6a R11: 1ffffffff215ba69 R12: dffffc0000000000
R13: 0000000000000a02 R14: ffff888054b312e8 R15: 1ffff920005d0da4
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 taprio_change+0x4143/0x50f0 net/sched/sch_taprio.c:1689
 qdisc_create+0x7cb/0x1090 net/sched/sch_api.c:1315
 tc_modify_qdisc+0xb2f/0x1cc0 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x79b/0xed0 net/core/rtnetlink.c:6153
 netlink_rcv_skb+0x1de/0x420 net/netlink/af_netlink.c:2511
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x89e/0xbc0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x59b/0x970 net/socket.c:2519
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x19e/0x270 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7effe038eb69
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:00007effe121e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007effe05b5fa0 RCX: 00007effe038eb69
RDX: 0000000000000000 RSI: 00002000000007c0 RDI: 0000000000000005
RBP: 00007effe0411df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007effe05b5fa0 R15: 00007fff6b3f8d38
 </TASK>