rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10504 jiffies, g=57093, q=238 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295044548-4295034046), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g57093 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:25920 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x15b/0x2b0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
 kthread+0x7b9/0x940 kernel/kthread.c:464
 ret_from_fork+0x4d/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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 13626 Comm: syz.4.1718 Not tainted 6.15.0-rc2-syzkaller-00404-g8560697b23dc #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:debug_object_activate+0xa1/0x5c0 lib/debugobjects.c:806
Code: f3 f3 f3 f3 66 42 c7 44 33 0d f3 f3 42 c6 44 33 0f f3 4c 8d 64 24 70 ba 10 00 00 00 4c 89 ff 31 f6 e8 d3 c5 21 fd 49 c1 ec 03 <4c> 89 64 24 38 43 0f b6 04 34 84 c0 0f 85 42 04 00 00 c7 44 24 70
RSP: 0018:ffffc90000007be0 EFLAGS: 00000012
RAX: ffffc90000007c40 RBX: 1ffff92000000f84 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000007c50
RBP: ffffc90000007cf8 R08: ffffc90000007c4f R09: ffffc90000007c40
R10: dffffc0000000000 R11: fffff52000000f8a R12: 1ffff92000000f8a
R13: ffffffff8c4cd700 R14: dffffc0000000000 R15: ffffc90000007c40
FS:  00007f09b6e8f6c0(0000) GS:ffff888124f9a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c425446 CR3: 000000007c138000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline]
 debug_activate kernel/time/hrtimer.c:484 [inline]
 enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1088
 __run_hrtimer kernel/time/hrtimer.c:1778 [inline]
 __hrtimer_run_queues+0x6d6/0xd40 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 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:mt_locked lib/maple_tree.c:793 [inline]
RIP: 0010:mas_root lib/maple_tree.c:844 [inline]
RIP: 0010:mas_start+0x1e1/0x5a0 lib/maple_tree.c:1371
Code: 8b 1e 48 85 db 0f 84 92 00 00 00 e8 79 99 9c f5 48 89 df be ff ff ff ff e8 ac 81 09 00 89 c3 31 ff 89 c6 e8 a1 9d 9c f5 31 ed <85> db 40 0f 95 c5 4c 8b 74 24 08 eb 29 e8 4d 99 9c f5 eb 69 e8 46
RSP: 0018:ffffc9000ae6eff8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffff8880601b1e00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8c26229f R09: ffffc9000ae6f1d8
R10: dffffc0000000000 R11: fffff520015cde3f R12: dffffc0000000000
R13: ffff88806810f21e R14: ffff88806cc95040 R15: ffffc9000ae6f1e8
 mt_validate+0x1e8/0x4b40 lib/maple_tree.c:7544
 validate_mm+0xf3/0x5a0 mm/vma.c:595
 __split_vma+0x9da/0xb20 mm/vma.c:524
 vms_gather_munmap_vmas+0x4e1/0x13d0 mm/vma.c:1336
 __mmap_prepare mm/vma.c:2303 [inline]
 __mmap_region mm/vma.c:2506 [inline]
 mmap_region+0xa13/0x2ea0 mm/vma.c:2597
 do_mmap+0xd42/0x1420 mm/mmap.c:561
 vm_mmap_pgoff+0x2a2/0x530 mm/util.c:579
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09b5f8e169
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:00007f09b6e8f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f09b61b5fa0 RCX: 00007f09b5f8e169
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f09b6010a68 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f09b61b5fa0 R15: 00007ffdb64c0098
 </TASK>