rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=34353, q=260 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294969843-4294959341), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g34353 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:27304 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x168f/0x4c70 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2248
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 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: 9869 Comm: syz.3.1777 Not tainted 6.15.0-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__lock_acquire+0x804/0xd20 kernel/locking/lockdep.c:-1
Code: de e8 10 e5 48 03 eb c4 44 89 e0 25 ff 1f 00 00 41 c1 ec 03 41 81 e4 00 60 00 00 41 09 c4 4c 89 f1 48 c1 e9 20 89 ca c1 c2 04 <41> 29 cc 44 31 e2 44 01 f1 41 29 d6 89 d6 c1 c6 06 44 31 f6 01 ca
RSP: 0018:ffffc90000a08140 EFLAGS: 00000807
RAX: 0000000000000071 RBX: 0000000000000003 RCX: 00000000ffffffff
RDX: 00000000ffffffff RSI: ffff88801bf9e568 RDI: ffff88801bf9da00
RBP: ffff88801bf9e4f0 R08: 0000000000000000 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff81ae5972 R12: 0000000000000071
R13: 0000000000000000 R14: ffffffffffffffff R15: ffff88801bf9e568
FS:  0000000000000000(0000) GS:ffff8881261f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efde1c79f98 CR3: 000000004df9a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1765 [inline]
 __hrtimer_run_queues+0x602/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline]
RIP: 0010:rcu_is_watching+0x60/0xb0 kernel/rcu/tree.c:737
Code: 80 3c 38 00 74 08 4c 89 f7 e8 5c ac 78 00 48 c7 c3 58 cb 73 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 34 8b 03 <65> ff 0d 49 87 cb 10 74 11 83 e0 04 c1 e8 02 5b 41 5e 41 5f c3 cc
RSP: 0018:ffffc90000a08670 EFLAGS: 00000246
RAX: 0000000000054fc4 RBX: ffff8880b8932b58 RCX: d47eebc6dc096e00
RDX: ffffc90000a08801 RSI: ffffffff8bc12220 RDI: ffffffff8bc121e0
RBP: dffffc0000000000 R08: ffffc90000a088f0 R09: 0000000000000000
R10: ffffc90000a08818 R11: fffff52000141105 R12: ffffc90000a08900
R13: ffffffff8171ca05 R14: ffffffff8d95cc28 R15: dffffc0000000000
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x4b/0x3e0 kernel/locking/lockdep.c:5877
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf7/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1258 [inline]
 __free_frozen_pages+0xb05/0xcd0 mm/page_alloc.c:2721
 pagetable_free include/linux/mm.h:3019 [inline]
 pagetable_dtor_free include/linux/mm.h:3117 [inline]
 __tlb_remove_table+0x2d2/0x3b0 include/asm-generic/tlb.h:215
 __tlb_remove_table_free mm/mmu_gather.c:227 [inline]
 tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:290
 rcu_do_batch kernel/rcu/tree.c:2568 [inline]
 rcu_core+0xca5/0x1710 kernel/rcu/tree.c:2824
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:exit_mmap+0x516/0xba0 mm/mmap.c:1306
Code: 00 10 00 4d 8d 6f 20 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ef e8 de 62 14 00 4d 8b 6d 00 <be> 00 00 10 00 4c 21 ee 31 ff e8 6b 93 b4 ff 49 21 dd 75 07 e8 81
RSP: 0018:ffffc9000bf8f840 EFLAGS: 00000246
RAX: 1ffff11006714ca4 RBX: 0000000000100000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8e03ae80 RDI: ffff8880338a6500
RBP: ffffc9000bf8f9f8 R08: ffff88801bf9da00 R09: 0000000000000002
R10: 0000000000000406 R11: 0000000000000000 R12: 0000000000001922
R13: 0000000008100073 R14: 0000000000000019 R15: ffff8880338a6500
 __mmput+0x118/0x410 kernel/fork.c:1380
 exit_mm+0x1da/0x2c0 kernel/exit.c:589
 do_exit+0x859/0x2550 kernel/exit.c:940
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 get_signal+0x125e/0x1310 kernel/signal.c:3034
 arch_do_signal_or_restart+0x95/0x780 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x8b/0x120 kernel/entry/common.c:218
 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6345f8e969
Code: Unable to access opcode bytes at 0x7f6345f8e93f.
RSP: 002b:00007f6346ebf0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f63461b5fa8 RCX: 00007f6345f8e969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f63461b5fa8
RBP: 00007f63461b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f63461b5fac
R13: 0000000000000000 R14: 00007ffc2cd1c5c0 R15: 00007ffc2cd1c6a8
 </TASK>