rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=525c/1/0x4000000000000000 softirq=29204/29206 fqs=368
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8285/1:b..l
rcu: 	(detected by 1, t=10504 jiffies, g=34261, q=675 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8286 Comm: syz.1.853 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:enqueue_hrtimer+0xfb/0x2c0 kernel/time/hrtimer.c:1139
Code: 83 c7 51 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 46 01 00 00 41 80 3f 01 0f 85 fa 00 00 00 e8 e9 5d 13 00 4c 8d 7b 08 <4c> 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 3a 01 00 00 45 8b
RSP: 0018:ffffc90000007d88 EFLAGS: 00000002
RAX: ffffffff81b3dce7 RBX: ffff8880b8628340 RCX: ffff8880511e3e80
RDX: 0000000001000201 RSI: 0000000001000001 RDI: ffffffff8c6d5720
RBP: 0000000000000000 R08: 0000000001000001 R09: 1ffffffff20f3827
R10: dffffc0000000000 R11: fffffbfff20f3828 R12: 1ffff110170c5068
R13: dffffc0000000000 R14: ffff888053ac9300 R15: ffff8880b8628348
FS:  00007fb3ca6716c0(0000) GS:ffff888124cf3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000012c0 CR3: 00000000281a2000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:2083 [inline]
 __hrtimer_run_queues+0x4ce/0xa10 kernel/time/hrtimer.c:2124
 hrtimer_interrupt+0x4cd/0xaa0 kernel/time/hrtimer.c:2243
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 8d 39 c0 f5 f7 c3 00 02 00 00 74 05 e8 30 6d ec f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 74 57 b1 f5 65 48 8b 05 2c be af 07 48 85 c0 74 18 5b 41 5e e9
RSP: 0018:ffffc9000317eee8 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000282 RCX: 8000000000000202
RDX: 0000000000000002 RSI: ffffffff8e46da75 RDI: 0000000000000001
RBP: ffffc9000317f1d0 R08: ffffffff9079c13f R09: 1ffffffff20f3827
R10: dffffc0000000000 R11: fffffbfff20f3828 R12: ffff888053ac92a8
R13: dffffc0000000000 R14: ffff888053ac92a8 R15: ffff888053ac92f8
 spin_unlock_irqrestore include/linux/spinlock.h:425 [inline]
 taprio_change+0x346a/0x45c0 net/sched/sch_taprio.c:1994
 taprio_init+0x994/0xc00 net/sched/sch_taprio.c:2133
 qdisc_create+0x7b5/0xf00 net/sched/sch_api.c:1346
 __tc_modify_qdisc net/sched/sch_api.c:1780 [inline]
 tc_modify_qdisc+0x17af/0x2390 net/sched/sch_api.c:1844
 rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7141
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2713
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767
 __sys_sendmsg net/socket.c:2799 [inline]
 __do_sys_sendmsg net/socket.c:2804 [inline]
 __se_sys_sendmsg net/socket.c:2802 [inline]
 __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb3c979e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb3ca671028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb3c9a25fa0 RCX: 00007fb3c979e0d9
RDX: 000000000000c004 RSI: 00002000000012c0 RDI: 0000000000000004
RBP: 00007fb3c9835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb3c9a26038 R14: 00007fb3c9a25fa0 R15: 00007ffef88b78e8
 </TASK>
task:iou-wrk-8278    state:R  running task     stack:27832 pid:8285  tgid:8276  ppid:5605   task_flags:0x404050 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x17d4/0x5820 kernel/sched/core.c:7270
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0xd09/0x2550 arch/x86/kernel/unwind_orc.c:645
Code: 18 74 08 48 89 df e8 b6 5f bf 00 48 8b 04 24 48 89 03 ba 10 00 00 00 49 8d 5e 50 48 89 df 31 f6 e8 7c 61 bf 00 48 8b 54 24 08 <e9> c7 04 00 00 48 89 5c 24 48 49 8d 7e 08 48 89 fb 48 c1 eb 03 42
RSP: 0018:ffffc9000415f3c0 EFLAGS: 00000202
RAX: ffffc9000415f4b8 RBX: ffffc9000415f4b8 RCX: 0000000000000000
RDX: ffffffff911f8dd0 RSI: 0000000000000000 RDI: ffffc9000415f4c8
RBP: 1ffffffff223f1ba R08: ffffc9000415f4c7 R09: ffffc9000415f4b8
R10: dffffc0000000000 R11: fffff5200082be99 R12: dffffc0000000000
R13: ffffffff911f8dcc R14: ffffc9000415f468 R15: ffffc9000415f4b0
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 task_work_add+0xae/0x420 kernel/task_work.c:70
 io_req_normal_work_add+0x193/0x290 io_uring/tw.c:230
 __io_arm_poll_handler+0x780/0xc10 io_uring/poll.c:-1
 io_poll_add+0xda/0x200 io_uring/poll.c:909
 __io_issue_sqe+0x188/0x4d0 io_uring/io_uring.c:1386
 io_issue_sqe+0x16d/0x1020 io_uring/io_uring.c:1409
 io_wq_submit_work+0x7ab/0xc90 io_uring/io_uring.c:1525
 io_worker_handle_work+0x7a1/0x1140 io_uring/io-wq.c:659
 io_wq_worker+0x452/0xf10 io_uring/io-wq.c:714
 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: rcu_preempt kthread starved for 8664 jiffies! g34261 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27752 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x17d4/0x5820 kernel/sched/core.c:7270
 __schedule_loop kernel/sched/core.c:7347 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7362
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
 kthread+0x38b/0x480 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:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 9c 93 02 e9 5e f0 2f f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 93 20 29 00 fb f4 <e9> 37 f0 2f f5 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000197e40 EFLAGS: 00000242
RAX: 000000000014c785 RBX: ffffffff819b2b3c RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e46da75 RDI: ffffffff8c6d5780
RBP: ffffc90000197f10 R08: ffff8880b8733a1b R09: 1ffff110170e6743
R10: dffffc0000000000 R11: ffffed10170e6744 R12: 0000000000000000
R13: 1ffff11003c56000 R14: 1ffff92000032fd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888124df3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc2772dd58 CR3: 000000002526a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:767 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:768
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x1cc/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x157
 </TASK>