rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10263/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=70665, q=811 ncpus=2)
task:syz.2.743       state:R  running task     stack:23952 pid:10263 tgid:10261 ppid:9727   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 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:5763
Code: 2b 00 74 08 4c 89 f7 e8 6a 04 8b 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:ffffc900043a74e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000874ea8 RCX: b3da30e060bcf000
RDX: dffffc0000000000 RSI: ffffffff8c0ae6e0 RDI: ffffffff8c608d80
RBP: ffffc900043a7628 R08: ffffffff941e4847 R09: 1ffffffff283c908
R10: dffffc0000000000 R11: fffffbfff283c909 R12: 1ffff92000874ea4
R13: dffffc0000000000 R14: ffffc900043a7540 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 rcu_read_lock include/linux/rcupdate.h:838 [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:3000 [inline]
 follow_page_pte+0x11b/0x1ee0 mm/gup.c:832
 follow_pud_mask mm/gup.c:1006 [inline]
 follow_p4d_mask mm/gup.c:1023 [inline]
 follow_page_mask+0x739/0x2f90 mm/gup.c:1066
 __get_user_pages+0x67b/0x16a0 mm/gup.c:1491
 populate_vma_page_range+0x264/0x330 mm/gup.c:1932
 __mm_populate+0x27a/0x460 mm/gup.c:2035
 mm_populate include/linux/mm.h:3430 [inline]
 vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:593
 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: 0033:0x7f957b97cef9
RSP: 002b:00007f957c81e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f957bb35f80 RCX: 00007f957b97cef9
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f957b9ef01e R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f957bb35f80 R15: 00007ffc93eb7328
 </TASK>
rcu: rcu_preempt kthread starved for 9847 jiffies! g70665 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:25232 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/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:106 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111