rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=ebdc/1/0x4000000000000000 softirq=34892/34892 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8012/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=30469, q=313 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8038 Comm: syz.1.511 Not tainted 6.16.0-rc2-next-20250620-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:advance_sched+0x1ab/0xc90 net/sched/sch_taprio.c:-1
Code: 74 24 f0 4c 89 f1 48 c1 e9 03 48 b8 00 00 00 00 00 fc ff df 48 89 4c 24 68 80 3c 01 00 74 08 4c 89 f7 e8 48 c6 97 f8 49 8b 06 <48> 89 04 24 e8 6c a2 e0 01 89 c3 31 ff 89 c6 e8 91 9f 33 f8 85 db
RSP: 0018:ffffc90000007c70 EFLAGS: 00000046
RAX: ffff88805a80cc00 RBX: 0000000000000001 RCX: 1ffff11004776e66
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f7c R12: ffff888023bb7340
R13: ffff888023bb7000 R14: ffff888023bb7330 R15: ffff88805a80e400
FS:  00007f9c569f66c0(0000) GS:ffff888125c26000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c569f5f98 CR3: 0000000078d14000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 7b 06 58 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a3 f1 20 f6 65 8b 05 0c bb 2f 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc9000bb4fb60 EFLAGS: 00000206
RAX: 6847145662400a00 RBX: 0000000000000a06 RCX: 6847145662400a00
RDX: 0000000000000007 RSI: ffffffff8d991d22 RDI: 0000000000000001
RBP: ffffc9000bb4fbf0 R08: ffffffff8fa193f7 R09: 1ffffffff1f4327e
R10: dffffc0000000000 R11: fffffbfff1f4327f R12: dffffc0000000000
R13: ffff8880b8627ac0 R14: ffff8880b8627ac0 R15: 1ffff92001769f6c
 clock_was_set+0x63b/0x7c0 kernel/time/hrtimer.c:972
 do_settimeofday64+0x2ec/0x5e0 kernel/time/timekeeping.c:1407
 __do_sys_clock_settime kernel/time/posix-timers.c:1132 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1116 [inline]
 __x64_sys_clock_settime+0x22c/0x280 kernel/time/posix-timers.c:1116
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9c58b8e929
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:00007f9c569f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f9c58db5fa0 RCX: 00007f9c58b8e929
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007f9c58c10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f9c58db5fa0 R15: 00007ffcbc5db368
 </TASK>
task:syz.4.504       state:R  running task     stack:21056 pid:8012  tgid:8011  ppid:7581   task_flags:0x40074c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5313 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6696
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6876
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6900
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1783 [inline]
 zap_pmd_range mm/memory.c:1845 [inline]
 zap_pud_range mm/memory.c:1874 [inline]
 zap_p4d_range mm/memory.c:1895 [inline]
 unmap_page_range+0x3842/0x41c0 mm/memory.c:1916
 unmap_single_vma mm/memory.c:1959 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:2003
 exit_mmap+0x248/0xb50 mm/mmap.c:1284
 __mmput+0x118/0x420 kernel/fork.c:1120
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x648/0x2300 kernel/exit.c:947
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1100
 get_signal+0x1286/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fad4318e929
RSP: 002b:00007fad440d10e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 00000000000000ca RBX: 00007fad433b5fa8 RCX: 00007fad4318e929
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fad433b5fac
RBP: 00007fad433b5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fad433b5fac
R13: 0000000000000000 R14: 00007ffc510a4540 R15: 00007ffc510a4628
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g30469 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=15494
rcu: rcu_preempt kthread starved for 10502 jiffies! g30469 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:27128 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5313 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6696
 __schedule_loop kernel/sched/core.c:6774 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6789
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2060
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2262
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>