rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=6984/1/0x4000000000000000 softirq=98731/98731 fqs=60
rcu: 	(detected by 1, t=10502 jiffies, g=66865, q=147 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15529 Comm: syz.5.2722 Not tainted 6.16.0-rc6-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:32 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:127 [inline]
RIP: 0010:lock_is_held_type+0x68/0x190 kernel/locking/lockdep.c:5939
Code: 00 00 65 4c 8b 2c 25 08 50 a0 92 41 83 bd ec 0a 00 00 00 0f 85 d8 00 00 00 89 f5 49 89 fe 48 c7 04 24 00 00 00 00 9c 8f 04 24 <4c> 8b 24 24 fa 48 c7 c7 17 c6 9a 8d e8 e7 16 00 00 65 ff 05 d0 43
RSP: 0018:ffffc90000007cf8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000000010000
RDX: ffff88802a169e00 RSI: 00000000ffffffff RDI: ffff8880b8627ad8
RBP: 00000000ffffffff R08: ffff888032dbe357 R09: ffff888032dbe340
R10: dffffc0000000000 R11: ffffed10065b7c6b R12: ffff888032dbe340
R13: ffff88802a169e00 R14: ffff8880b8627ad8 R15: ffff8880b8627cc0
FS:  0000000000000000(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003200 CR3: 000000000df38000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 lock_is_held include/linux/lockdep.h:249 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1727 [inline]
 __hrtimer_run_queues+0x284/0xc60 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+0x10b/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:__tlb_remove_folio_pages_size+0x24e/0x5a0 mm/mmu_gather.c:203
Code: 34 24 41 ff ce 89 ef 44 89 f6 e8 2d 45 b1 ff 44 39 f5 0f 87 46 03 00 00 e8 5f 43 b1 ff 31 c0 48 83 c4 20 5b 41 5c 41 5d 41 5e <41> 5f 5d e9 e5 50 01 ff cc 48 bb 00 00 00 00 00 fc ff df 41 80 3c
RSP: 0018:ffffc90003427388 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffff888032523b60 RCX: ffff88802a169e00
RDX: 0000000000000000 RSI: 00000000000001fd RDI: 0000000000000173
RBP: 0000000000000173 R08: ffffea0001828d73 R09: 1ffffd40003051ae
R10: dffffc0000000000 R11: fffff940003051af R12: 00007f0aded6c000
R13: dffffc0000000000 R14: ffff888032523b00 R15: ffffc90003427860
 zap_present_folio_ptes mm/memory.c:1534 [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+0x1f5e/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+0x648/0x22e0 kernel/exit.c:952
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105
 get_signal+0x1286/0x1340 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: 0033:0x7f0adfb8e929
Code: Unable to access opcode bytes at 0x7f0adfb8e8ff.
RSP: 002b:00007f0ae09d70e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f0adfdb5fa8 RCX: 00007f0adfb8e929
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f0adfdb5fac
RBP: 00007f0adfdb5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f0adfdb5fac
R13: 0000000000000000 R14: 00007ffdcf033700 R15: 00007ffdcf0337e8
 </TASK>
rcu: rcu_preempt kthread starved for 10381 jiffies! g66865 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:26472 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6879
 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+0x3fc/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:
CPU: 1 UID: 0 PID: 12144 Comm: udevd Not tainted 6.16.0-rc6-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:native_pause arch/x86/include/asm/vdso/processor.h:13 [inline]
RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xf67/0x12d0 kernel/smp.c:885
Code: 00 00 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 d0 78 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 7b 74 0b 00 eb 37 <f3> 90 43 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 60
RSP: 0018:ffffc90000bb7940 EFLAGS: 00000293
RAX: ffffffff81b4bf10 RBX: ffff8880b873b1c0 RCX: ffff88802b203c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000bb7aa0 R08: ffffffff8fa1f5f7 R09: 1ffffffff1f43ebe
R10: dffffc0000000000 R11: fffffbfff1f43ebf R12: 1ffff110170c8385
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8641c28
FS:  00007f98d0842880(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f98d0841000 CR3: 000000006ae3b000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x6b1/0x12c0 arch/x86/mm/tlb.c:1451
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:490 [inline]
 tlb_flush_mmu+0x1a7/0x680 mm/mmu_gather.c:403
 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497
 do_mprotect_pkey+0x9fd/0xce0 mm/mprotect.c:840
 __do_sys_mprotect mm/mprotect.c:853 [inline]
 __se_sys_mprotect mm/mprotect.c:850 [inline]
 __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:850
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98d011dfe7
Code: ef e8 3d fa ff ff 84 c0 75 b9 31 db 48 83 c4 08 48 89 d8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 44 00 00 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 2d 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffcc3eb2ac8 EFLAGS: 00000246 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 0000000000000200 RCX: 00007f98d011dfe7
RDX: 0000000000000001 RSI: 0000000000000200 RDI: 00007f98d0841000
RBP: 000055561808c4e0 R08: 0000000000000000 R09: 0000000000000200
R10: 000055561808c540 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000ff0000 R14: 000055561809a448 R15: 00007f98d096939c
 </TASK>