rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=88d4/0/0x1 softirq=22518/22518 fqs=2268
rcu: 	(detected by 1, t=10502 jiffies, g=15677, q=171 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:advance_sched+0x718/0xc80 net/sched/sch_taprio.c:-1
Code: f8 48 8b 44 24 08 4a 03 1c f8 48 c7 c7 40 8f 11 8f 4c 89 fe e8 29 6d 76 fb e9 77 fe ff ff e8 4f 5a 73 f8 eb 05 e8 48 5a 73 f8 <4c> 8b 3c 24 48 8b 44 24 40 48 85 c0 4c 8b 6c 24 18 48 8b 6c 24 28
RSP: 0018:ffffc90000007c70 EFLAGS: 00000006
RAX: ffffffff894c0e01 RBX: 18969e4114000000 RCX: ffffffff8da94a80
RDX: 0000000000010000 RSI: 0000000004000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f7c R12: dffffc0000000000
R13: ffff888032ce3cc8 R14: ffff888032ce3c08 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888126372000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f92fbf72a60 CR3: 00000000721ac000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x518/0xc10 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x457/0xa90 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0xfe/0x3c0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0xb/0x20 arch/x86/kernel/paravirt.c:82
Code: cd 51 02 c3 cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 90 0f 00 2d b7 06 23 00 fb f4 <e9> d0 df 02 00 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90
RSP: 0018:ffffffff8da07dc0 EFLAGS: 000002c2
RAX: 00000000000bb2c1 RBX: ffffffff819607ea RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8d553444 RDI: ffffffff8ba0db60
RBP: ffffffff8da07eb0 R08: ffff8880b88336db R09: 1ffff110171066db
R10: dffffc0000000000 R11: ffffed10171066dc R12: ffffffff8f5adeb0
R13: 1ffffffff1b52950 R14: 0000000000000000 R15: 0000000000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0xf/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x6d/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1ba/0x4d0 kernel/sched/idle.c:332
 cpu_startup_entry+0x40/0x60 kernel/sched/idle.c:430
 rest_init+0x2de/0x300 init/main.c:757
 start_kernel+0x37d/0x3d0 init/main.c:1206
 x86_64_start_reservations+0x20/0x20 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x13f/0x1c0 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x147
 </TASK>
rcu: rcu_preempt kthread starved for 5966 jiffies! g15677 f0x0 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:27472 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1497/0x4f60 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x161/0x360 kernel/sched/core.c:6960
 schedule_timeout+0x127/0x260 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2fd/0x1520 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:2285
 kthread+0x70d/0x890 kernel/kthread.c:463
 ret_from_fork+0x508/0xa20 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 5469 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xcbd/0x1230 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 9c 7e 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 57 7a 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 3b 7a
RSP: 0018:ffffc90003437640 EFLAGS: 00000293
RAX: ffffffff81b3ee15 RBX: 1ffff11017108561 RCX: ffff88802d5e8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003437768 R08: ffffffff8f5adeb7 R09: 1ffffffff1eb5bd6
R10: dffffc0000000000 R11: fffffbfff1eb5bd7 R12: ffff8880b8842b08
R13: dffffc0000000000 R14: ffff8880b893bac0 R15: 0000000000000000
FS:  00007f5e88b25740(0000) GS:ffff888126472000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa7299c3e70 CR3: 000000007e29c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline]
 flush_tlb_mm_range+0x5e2/0x1100 arch/x86/mm/tlb.c:1472
 dup_mmap+0x15f4/0x1b50 mm/mmap.c:1866
 dup_mm kernel/fork.c:1529 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1581
 copy_process+0x1655/0x3940 kernel/fork.c:2221
 kernel_clone+0x21a/0x820 kernel/fork.c:2651
 __do_sys_clone kernel/fork.c:2792 [inline]
 __se_sys_clone kernel/fork.c:2776 [inline]
 __x64_sys_clone+0x187/0x1e0 kernel/fork.c:2776
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x86/0x630 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f5e88bf9636
Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00
RSP: 002b:00007fff6795ad50 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff6795ad58 RCX: 00007f5e88bf9636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff6797b2a0 R08: 0000000000000000 R09: 0000000000000001
R10: 00007f5e88b25a10 R11: 0000000000000246 R12: 00007fff6795ae90
R13: 0000000000000000 R14: 0000000000000000 R15: 0000564d7f607ac0
 </TASK>