rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=32533, q=330 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294966073-4294955571), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g32533 f0x2 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:27544 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1821/0x5740 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7283
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x389/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7354 Comm: syz.0.487 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:timerqueue_linked_first include/linux/timerqueue.h:48 [inline]
RIP: 0010:base_update_next_timer kernel/time/hrtimer.c:1126 [inline]
RIP: 0010:__remove_hrtimer+0x193/0x3e0 kernel/time/hrtimer.c:1162
Code: c3 48 8b 44 24 08 4c 8d 60 44 4c 89 e0 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 ea 01 00 00 41 21 1c 24 4d 85 ed 0f 85 76 ff ff ff <4d> 8d 67 60 4c 89 e0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 c4
RSP: 0018:ffffc90000a08d90 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 00000000fffffffd RCX: 0000000000000001
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000020
RBP: dffffc0000000000 R08: ffff88807b2d6327 R09: 0000000000000000
R10: ffff88807b2d6318 R11: ffffed100f65ac65 R12: ffff8880b87282c4
R13: 0000000000000000 R14: ffff88807b2d6300 R15: ffff8880b87283c0
FS:  0000000000000000(0000) GS:ffff88812538a000(0063) knlGS:00000000f54a6b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f50eca81 CR3: 000000007545e000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1910 [inline]
 __hrtimer_run_queues+0x299/0xa20 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 2d ab f6 f5 f7 c3 00 02 00 00 74 05 e8 c0 3f 22 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> e4 29 e8 f5 65 8b 05 0d b0 8d 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc9000391eec8 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000282 RCX: 0000000000000202
RDX: 0000000000000002 RSI: ffffffff8dfab61d RDI: 0000000000000001
RBP: ffffc9000391f1b0 R08: ffffffff9030c6f7 R09: 1ffffffff20618de
R10: dffffc0000000000 R11: fffffbfff20618df R12: ffff88807b2d6290
R13: dffffc0000000000 R14: ffff88807b2d62a8 R15: ffff88807b2d62f8
 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
 taprio_change+0x30fe/0x3e50 net/sched/sch_taprio.c:1986
 taprio_init+0x96f/0xbe0 net/sched/sch_taprio.c:2125
 qdisc_create+0x7c4/0xf20 net/sched/sch_api.c:1319
 __tc_modify_qdisc net/sched/sch_api.c:1753 [inline]
 tc_modify_qdisc+0x16f0/0x2290 net/sched/sch_api.c:1817
 rtnetlink_rcv_msg+0x77e/0xbe0 net/core/rtnetlink.c:7005
 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x75c/0x8e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 ____sys_sendmsg+0x972/0x9f0 net/socket.c:2698
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752
 __sys_sendmsg+0x183/0x260 net/socket.c:2784
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x229/0x6e0 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fe401c
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8
RSP: 002b:00000000f54a650c EFLAGS: 00000206 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000800012c0
RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>