rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12026/1:b..l P13289/3:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=77681, q=446 ncpus=2)
task:syz.0.1889      state:R  running task     stack:24144 pid:13289 tgid:13288 ppid:11062  flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x1796/0x49d0 kernel/sched/core.c:6745
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 fa 29 86 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90004c6efe0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff9200098de08 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8bcaccc0 RDI: ffffffff8c1f1580
RBP: ffffc90004c6f128 R08: ffffffff92f71587 R09: 1ffffffff25ee2b0
R10: dffffc0000000000 R11: fffffbfff25ee2b1 R12: 1ffff9200098de04
R13: dffffc0000000000 R14: ffffc90004c6f040 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 rcu_read_lock include/linux/rcupdate.h:781 [inline]
 __pte_offset_map+0x9e/0x380 mm/pgtable-generic.c:287
 __pte_offset_map_lock+0xc7/0x300 mm/pgtable-generic.c:371
 pte_offset_map_lock include/linux/mm.h:3025 [inline]
 filemap_map_pages+0x82d/0x1e70 mm/filemap.c:3625
 do_fault_around mm/memory.c:4879 [inline]
 do_read_fault mm/memory.c:4912 [inline]
 do_fault mm/memory.c:5051 [inline]
 do_pte_missing mm/memory.c:3897 [inline]
 handle_pte_fault+0x3b9b/0x7090 mm/memory.c:5381
 __handle_mm_fault mm/memory.c:5524 [inline]
 handle_mm_fault+0xfb0/0x19d0 mm/memory.c:5689
 faultin_page mm/gup.c:1290 [inline]
 __get_user_pages+0x6ef/0x1590 mm/gup.c:1589
 populate_vma_page_range+0x264/0x330 mm/gup.c:2029
 __mm_populate+0x27a/0x460 mm/gup.c:2132
 mm_populate include/linux/mm.h:3469 [inline]
 vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:578
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f82b0975bd9
RSP: 002b:00007f82b03ff048 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f82b0b03f60 RCX: 00007f82b0975bd9
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f82b09e4a98 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f82b0b03f60 R15: 00007ffc27155958
 </TASK>
task:syz-executor    state:R  running task     stack:20288 pid:12026 tgid:12026 ppid:12018  flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x1796/0x49d0 kernel/sched/core.c:6745
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6924
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6948
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_pte_range mm/memory.c:1179 [inline]
 copy_pmd_range+0x7aa1/0x84c0 mm/memory.c:1240
 copy_pud_range mm/memory.c:1277 [inline]
 copy_p4d_range mm/memory.c:1301 [inline]
 copy_page_range+0x99f/0xe90 mm/memory.c:1399
 dup_mmap kernel/fork.c:751 [inline]
 dup_mm kernel/fork.c:1688 [inline]
 copy_mm+0x128d/0x2020 kernel/fork.c:1737
 copy_process+0x187a/0x3dc0 kernel/fork.c:2390
 kernel_clone+0x223/0x870 kernel/fork.c:2797
 __do_sys_clone kernel/fork.c:2940 [inline]
 __se_sys_clone kernel/fork.c:2924 [inline]
 __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2924
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9cfab6c4d3
RSP: 002b:00007ffe62013398 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9cfab6c4d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 000055555ba217d0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10377 jiffies! g77681 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:26448 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x1796/0x49d0 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 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 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112