rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (2 GPs behind) idle=be74/1/0x4000000000000000 softirq=22823/22824 fqs=153
rcu: 	(detected by 1, t=10502 jiffies, g=18129, q=3600 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6645 Comm: rm Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
RIP: 0010:lock_acquire+0x10d/0x2e0 kernel/locking/lockdep.c:5870
Code: b4 24 88 00 00 00 41 56 e8 80 02 00 00 48 83 c4 28 48 c7 c7 de 0b 1a 8e e8 80 55 12 0a b8 ff ff ff ff 65 0f c1 05 63 1d 7c 11 <83> f8 01 0f 85 b0 00 00 00 9c 58 a9 00 02 00 00 0f 85 c3 00 00 00
RSP: 0018:ffffc90000007cb8 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000046 RCX: 0000000000010001
RDX: 000000002d2c0f00 RSI: ffffffff8e1a0bde RDI: ffffffff8c27d480
RBP: 0000000000000000 R08: ffffffff81b285a3 R09: ffff8880b8628298
R10: dffffc0000000000 R11: fffffbfff2023997 R12: 0000000000000000
R13: ffff8880b8628298 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88812544a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc0eb075eb8 CR3: 0000000071518000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1789 [inline]
 __hrtimer_run_queues+0x603/0xcc0 kernel/time/hrtimer.c:1849
 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:mas_validate_limits lib/maple_tree.c:7048 [inline]
RIP: 0010:mt_validate+0xccf/0x4320 lib/maple_tree.c:7173
Code: 01 00 00 4c 89 ef 4c 89 f6 e8 fd 14 19 f6 4d 39 f5 0f 87 43 02 00 00 e8 8f 12 19 f6 4c 3b ac 24 48 01 00 00 0f 84 2d 04 00 00 <e8> 7c 12 19 f6 48 ff c3 49 83 c4 08 ff 44 24 18 4d 89 ee 49 bd 00
RSP: 0018:ffffc900038972c0 EFLAGS: 00000207
RAX: ffffffff8bac9d61 RBX: 0000000000000002 RCX: ffff8880319d5b80
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 00007fc0eb333fff
RBP: ffffc900038974b0 R08: ffff8880319d5b80 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: ffff8880796e0418
R13: 00007fc0eb333fff R14: ffffffffffffffff R15: 0000000000000001
 validate_mm+0xd4/0x4c0 mm/vma.c:649
 mmap_region+0x1559/0x22a0 mm/vma.c:2850
 do_mmap+0xc39/0x10c0 mm/mmap.c:559
 vm_mmap_pgoff+0x2c9/0x4f0 mm/util.c:581
 ksys_mmap_pgoff+0x51e/0x760 mm/mmap.c:605
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc0eb360242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffce7106a38 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fc0eb041000 RCX: 00007fc0eb360242
RDX: 0000000000000005 RSI: 000000000001c000 RDI: 00007fc0eb041000
RBP: 0000000000000812 R08: 0000000000000003 R09: 0000000000008000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffce7106a88
R13: 00007fc0eb335ab0 R14: 00007ffce7106eb0 R15: 00000fff9ce20d4a
 </TASK>
rcu: rcu_preempt kthread starved for 10194 jiffies! g18129 f0x0 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:27744 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 6379 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xce5/0x12c0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 d4 eb 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 7f e7 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 63 e7
RSP: 0000:ffffc90002eb7820 EFLAGS: 00000293
RAX: ffffffff81b9c88d RBX: 1ffff110170c8525 RCX: ffff88802ecf3d00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90002eb7950 R08: ffffffff9011ccb7 R09: 1ffffffff2023996
R10: dffffc0000000000 R11: fffffbfff2023997 R12: ffff8880b8642928
R13: dffffc0000000000 R14: ffff8880b873c000 R15: 0000000000000000
FS:  000055556b308500(0000) GS:ffff88812554a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556b323a28 CR3: 0000000027760000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:57 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline]
 flush_tlb_mm_range+0x5c3/0x10c0 arch/x86/mm/tlb.c:1472
 flush_tlb_page arch/x86/include/asm/tlbflush.h:323 [inline]
 ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:103
 wp_page_copy mm/memory.c:3846 [inline]
 do_wp_page+0x4129/0x5a00 mm/memory.c:4241
 handle_pte_fault mm/memory.c:6333 [inline]
 __handle_mm_fault mm/memory.c:6455 [inline]
 handle_mm_fault+0x1520/0x3310 mm/memory.c:6624
 do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f0df3d5f160
Code: 2b 27 00 48 8d 0c 1e 49 39 d0 49 89 48 60 0f 95 c2 48 29 d8 0f b6 d2 48 83 c8 01 48 c1 e2 02 48 09 da 48 83 ca 01 48 89 56 08 <48> 89 41 08 48 8d 4e 10 eb b0 48 8d 0d 07 b5 0c 00 ba 9e 10 00 00
RSP: 002b:00007ffcad265190 EFLAGS: 00010206
RAX: 00000000000065e1 RBX: 0000000000008040 RCX: 000055556b323a20
RDX: 0000000000008041 RSI: 000055556b31b9e0 RDI: 0000000000000004
RBP: 0000000000000802 R08: 00007f0df3fd1cc0 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000008030
R13: 0000000000000000 R14: 00007f0df3fd1d20 R15: 0000000000000000
 </TASK>