rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5090/1:b..l P5083/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=35469, q=158 ncpus=2)
task:syz-executor.0  state:R  running task     stack:20272 pid:5083  tgid:5083  ppid:5073   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
 preempt_schedule_common+0x83/0xc0 kernel/sched/core.c:6865
 preempt_schedule+0xdd/0xf0 kernel/sched/core.c:6889
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_pte_range mm/memory.c:1115 [inline]
 copy_pmd_range mm/memory.c:1176 [inline]
 copy_pud_range mm/memory.c:1213 [inline]
 copy_p4d_range mm/memory.c:1237 [inline]
 copy_page_range+0x3793/0x43e0 mm/memory.c:1335
 dup_mmap kernel/fork.c:758 [inline]
 dup_mm kernel/fork.c:1691 [inline]
 copy_mm+0x11fc/0x1f10 kernel/fork.c:1740
 copy_process+0x1d6f/0x3fb0 kernel/fork.c:2502
 kernel_clone+0x222/0x840 kernel/fork.c:2907
 __do_sys_clone kernel/fork.c:3050 [inline]
 __se_sys_clone kernel/fork.c:3034 [inline]
 __x64_sys_clone+0x258/0x2a0 kernel/fork.c:3034
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f34fbc79b13
RSP: 002b:00007ffd82b66ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f34fbc79b13
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 00005555572e4750 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
task:syz-executor.4  state:R  running task     stack:20208 pid:5090  tgid:5090  ppid:5080   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
 preempt_schedule_irq+0xfb/0x1b0 kernel/sched/core.c:7008
 irqentry_exit+0x5a/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x25a/0x530 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 14 5b 7d 00 f6 44 24 61 02 0f 85 8a 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:ffffc90003daee60 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920007b5dd8 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8b6abf60 RDI: ffffffff8bbdf1a0
RBP: ffffc90003daefb0 R08: ffffffff90dd7367 R09: 1ffffffff21bae6c
R10: dffffc0000000000 R11: fffffbfff21bae6d R12: 1ffff920007b5dd4
R13: dffffc0000000000 R14: ffffc90003daeec0 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 rcu_read_lock include/linux/rcupdate.h:747 [inline]
 percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline]
 percpu_ref_put+0x36/0x180 include/linux/percpu-refcount.h:351
 css_put include/linux/cgroup_refcnt.h:79 [inline]
 obj_cgroup_charge_pages mm/memcontrol.c:3261 [inline]
 __memcg_kmem_charge_page+0x126/0x250 mm/memcontrol.c:3281
 __alloc_pages+0x28b/0x680 mm/page_alloc.c:4585
 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133
 pagetable_alloc include/linux/mm.h:2830 [inline]
 __pte_alloc_one include/asm-generic/pgalloc.h:68 [inline]
 pte_alloc_one+0x88/0x5d0 arch/x86/mm/pgtable.c:33
 __pte_alloc+0x79/0x3a0 mm/memory.c:438
 copy_pte_range mm/memory.c:1037 [inline]
 copy_pmd_range mm/memory.c:1176 [inline]
 copy_pud_range mm/memory.c:1213 [inline]
 copy_p4d_range mm/memory.c:1237 [inline]
 copy_page_range+0x3985/0x43e0 mm/memory.c:1335
 dup_mmap kernel/fork.c:758 [inline]
 dup_mm kernel/fork.c:1691 [inline]
 copy_mm+0x11fc/0x1f10 kernel/fork.c:1740
 copy_process+0x1d6f/0x3fb0 kernel/fork.c:2502
 kernel_clone+0x222/0x840 kernel/fork.c:2907
 __do_sys_clone kernel/fork.c:3050 [inline]
 __se_sys_clone kernel/fork.c:3034 [inline]
 __x64_sys_clone+0x258/0x2a0 kernel/fork.c:3034
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f93f7079b13
RSP: 002b:00007ffcd2dd8c28 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f93f7079b13
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 000055555603d750 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
rcu: rcu_preempt kthread starved for 10553 jiffies! g35469 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:26256 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6778
 schedule_timeout+0x1bd/0x300 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x30a/0x1500 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1830
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>