rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10504 jiffies, g=104553, q=454 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10492 (4295121653-4295111161), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10492 jiffies! g104553 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:26464 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16a2/0x4cb0 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+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 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: 23184 Comm: syz.9.4957 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:118 [inline]
RIP: 0010:lock_acquire+0x8d/0x360 kernel/locking/lockdep.c:5847
Code: f6 05 df 88 eb 0d 01 0f 84 d7 01 00 00 83 3d 19 c6 01 0e 00 0f 84 f0 00 00 00 48 8b b4 24 90 00 00 00 4c 89 ef e8 03 50 83 00 <83> 3d fc c5 01 0e 00 0f 84 fa 00 00 00 65 8b 05 ff eb fa 10 85 c0
RSP: 0018:ffffc90000a08bd0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 6897804852eb4f00
RDX: 0000000000000000 RSI: ffffffff897d2e04 RDI: 1ffffffff1c27e28
RBP: ffffffff897d2de8 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100b185e5e R12: 0000000000000002
R13: ffffffff8e13f140 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125d93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fd1fffc CR3: 0000000076912000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 advance_sched+0xa14/0xc90 net/sched/sch_taprio.c:985
 __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+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:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x44/0x3e0 kernel/locking/lockdep.c:5882
Code: 8b 05 30 9b fa 10 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 33 9b fa 10 83 f8 08 0f 83 9a 02 00 00 89 c0 48 0f a3 05 dc 83 01 0e <73> 16 e8 e5 e1 08 00 84 c0 75 0d f6 05 c6 77 eb 0d 01 0f 84 ad 02
RSP: 0018:ffffc9000ec872f0 EFLAGS: 00000297
RAX: 0000000000000001 RBX: 1ffffffff3352c24 RCX: ffff88807e86da00
RDX: 0000000000000000 RSI: ffffffff820bbad0 RDI: ffff8880b8733e70
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff3352c24 R12: ffffea0001abe608
R13: ffffffff820bbad0 R14: ffff8880b8733e70 R15: ffff8880b8733e98
 local_lock_release include/linux/local_lock_internal.h:54 [inline]
 munlock_folio+0x3df/0x6d0 mm/mlock.c:304
 zap_present_folio_ptes mm/memory.c:1529 [inline]
 zap_present_ptes mm/memory.c:1590 [inline]
 do_zap_pte_range mm/memory.c:1691 [inline]
 zap_pte_range mm/memory.c:1735 [inline]
 zap_pmd_range mm/memory.c:1827 [inline]
 zap_pud_range mm/memory.c:1856 [inline]
 zap_p4d_range mm/memory.c:1877 [inline]
 unmap_page_range+0x1e59/0x41c0 mm/memory.c:1898
 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+0x125e/0x1310 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: 0033:0x7f474898e969
Code: Unable to access opcode bytes at 0x7f474898e93f.
RSP: 002b:00007f474985b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f4748bb6088 RCX: 00007f474898e969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4748bb6088
RBP: 00007f4748bb6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4748bb608c
R13: 0000000000000000 R14: 00007fff10f3d220 R15: 00007fff10f3d308
 </TASK>