rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=2a64/1/0x4000000000000000 softirq=35671/35671 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=32321, q=147 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9119 Comm: syz.5.1112 Not tainted 6.15.0-next-20250603-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:qdisc_dev include/net/sch_generic.h:574 [inline]
RIP: 0010:advance_sched+0x5e/0xc90 net/sched/sch_taprio.c:916
Code: 80 3c 30 00 74 08 48 89 df e8 ce 3c 9e f8 4c 8b 2b 49 8d 5d 40 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 a8 3c 9e f8 48 8b 1b 48 89 d8 48 c1 e8 03 48 b9
RSP: 0018:ffffc90000a08c70 EFLAGS: 00000046
RAX: 1ffff1100f80d608 RBX: ffff88807c06b040 RCX: dffffc0000000000
RDX: 0000000000010000 RSI: 0000000000000000 RDI: ffff88807c06b340
RBP: ffffc90000a08e90 R08: ffffffff8fa124f7 R09: 1ffffffff1f4249e
R10: dffffc0000000000 R11: ffffffff8985a830 R12: ffff88807c06b340
R13: ffff88807c06b000 R14: dffffc0000000000 R15: ffff88802f83a8d8
FS:  0000000000000000(0000) GS:ffff888125d53000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f81eff8 CR3: 000000000df38000 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+0x52c/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+0x108/0x410 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:constant_test_bit arch/x86/include/asm/bitops.h:206 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:238 [inline]
RIP: 0010:tif_test_bit include/linux/thread_info.h:192 [inline]
RIP: 0010:tif_need_resched include/linux/thread_info.h:208 [inline]
RIP: 0010:need_resched include/linux/sched.h:2172 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1730 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1827 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1856 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1877 [inline]
RIP: 0010:unmap_page_range+0xc93/0x41c0 mm/memory.c:1898
Code: 29 00 74 15 48 8b bc 24 40 01 00 00 e8 06 c0 19 00 48 8b 84 24 40 01 00 00 48 8b 18 48 89 de 48 83 e6 08 31 ff e8 3d 3f b6 ff <48> 83 e3 08 0f 85 3f 27 00 00 48 8b 5c 24 08 48 89 d8 48 c1 e8 03
RSP: 0018:ffffc9000b1473a0 EFLAGS: 00000293
RAX: ffffffff820a2553 RBX: 0000000000004000 RCX: ffff88802f839e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000b147650 R08: ffffea00012fbeb3 R09: 1ffffd400025f7d6
R10: dffffc0000000000 R11: fffff9400025f7d7 R12: 00007f88d0a00000
R13: dffffc0000000000 R14: 00007f88d0873000 R15: ffffea00012fbeb0
 unmap_single_vma mm/memory.c:1941 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:1985
 exit_mmap+0x248/0xb50 mm/mmap.c:1284
 __mmput+0x118/0x420 kernel/fork.c:1121
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x640/0x22e0 kernel/exit.c:943
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104
 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: 0033:0x7f88d1f8e969
Code: Unable to access opcode bytes at 0x7f88d1f8e93f.
RSP: 002b:00007f88d2d6d0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f88d21b5fa8 RCX: 00007f88d1f8e969
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f88d21b5fac
RBP: 00007f88d21b5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f88d21b5fac
R13: 0000000000000000 R14: 00007ffd99c3a2c0 R15: 00007ffd99c3a3a8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g32321 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=13716
rcu: rcu_preempt kthread starved for 10502 jiffies! g32321 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27128 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6878
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 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>