rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=55245, q=305 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294988901-4294978399), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g55245 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:26104 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0x190e/0x4c90 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6856
 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </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: 12191 Comm: syz.0.1749 Not tainted 6.14.0-rc1-next-20250207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:hlock_class kernel/locking/lockdep.c:230 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3818 [inline]
RIP: 0010:validate_chain+0x126/0x5920 kernel/locking/lockdep.c:3874
Code: 04 00 00 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 40 b8 30 94 be 08 00 00 00 e8 b2 c9 8a 00 48 0f a3 1d 9a 1a 95 12 <72> 66 48 c7 c0 80 29 41 9a 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85
RSP: 0000:ffffc900000075e0 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff819b9d9e
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9430b840
RBP: ffffc900000078e0 R08: ffffffff9430b847 R09: 1ffffffff2861708
R10: dffffc0000000000 R11: fffffbfff2861709 R12: dffffc0000000000
R13: ffff888025dbc7d8 R14: 71a5d68fa1cc311c R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff67a7a7000 CR3: 0000000068e86000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
 debug_object_activate+0x17f/0x580 lib/debugobjects.c:818
 debug_hrtimer_activate kernel/time/hrtimer.c:455 [inline]
 debug_activate kernel/time/hrtimer.c:496 [inline]
 enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1100
 __run_hrtimer kernel/time/hrtimer.c:1818 [inline]
 __hrtimer_run_queues+0x6cb/0xd30 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x420 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:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 74 7a 72 0c 48 89 de 5b e9 43 94 5b 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 80 d6 03 00 65 8b 15 80 4d 44 7e 81 e2 00 01 ff 00
RSP: 0000:ffffc900045af248 EFLAGS: 00000202
RAX: ffffffff8231c448 RBX: 0000000000000001 RCX: ffff888025dbbc00
RDX: ffff888025dbbc00 RSI: ffffffff8c60ca00 RDI: ffffffff8c60c9c0
RBP: ffffc900045af610 R08: ffffffff8231c436 R09: 1ffff11003880923
R10: dffffc0000000000 R11: ffffed1003880924 R12: 1ffffd400014074b
R13: 0000000000000000 R14: ffffea0000a03a58 R15: 1ffff1100af69395
 rcu_read_unlock include/linux/rcupdate.h:878 [inline]
 page_ext_put+0x38/0xc0 mm/page_ext.c:550
 get_and_clear_full_ptes include/linux/pgtable.h:712 [inline]
 zap_present_folio_ptes mm/memory.c:1513 [inline]
 zap_present_ptes mm/memory.c:1598 [inline]
 do_zap_pte_range mm/memory.c:1700 [inline]
 zap_pte_range mm/memory.c:1742 [inline]
 zap_pmd_range mm/memory.c:1825 [inline]
 zap_pud_range mm/memory.c:1854 [inline]
 zap_p4d_range mm/memory.c:1875 [inline]
 unmap_page_range+0x352d/0x4270 mm/memory.c:1896
 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1986
 exit_mmap+0x283/0xd40 mm/mmap.c:1284
 __mmput+0x115/0x420 kernel/fork.c:1356
 exit_mm+0x220/0x310 kernel/exit.c:581
 do_exit+0x9ad/0x2860 kernel/exit.c:936
 do_group_exit+0x207/0x2c0 kernel/exit.c:1098
 get_signal+0x16b2/0x1750 kernel/signal.c:3036
 arch_do_signal_or_restart+0x96/0x860 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+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f909d78cde9
Code: Unable to access opcode bytes at 0x7f909d78cdbf.
RSP: 002b:00007f909e55e0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f909d9a5fa8 RCX: 00007f909d78cde9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f909d9a5fa8
RBP: 00007f909d9a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f909d9a5fac
R13: 0000000000000000 R14: 00007ffd0921e7f0 R15: 00007ffd0921e8d8
 </TASK>