rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7777/1:b..l P8607/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=51481, q=630 ncpus=2)
task:syz.1.598       state:R  running task     stack:24112 pid:8607  tgid:8606  ppid:7761   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5407 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6748
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7070
 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:debug_lockdep_rcu_enabled+0x0/0x40 kernel/rcu/update.c:319
Code: ca 8b 48 c7 c6 80 de ca 8b e8 2c 47 d1 f5 90 0f 0b 90 90 90 eb c6 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 31 c0 83 3d ff 7c 26 04 00 74 1e 83 3d 46 ae 26 04 00
RSP: 0018:ffffc900049cf738 EFLAGS: 00000292
RAX: 881f03d56a758000 RBX: 0000000000000040 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8bcacd40 RDI: ffffffff8c2028a0
RBP: ffffc900049cf810 R08: ffffffff92fb35c7 R09: 1ffffffff25f66b8
R10: dffffc0000000000 R11: fffffbfff25f66b9 R12: ffff88807a561300
R13: ffffffff81e34b14 R14: dffffc0000000000 R15: 1ffff92000939eec
 rcu_read_lock include/linux/rcupdate.h:840 [inline]
 count_memcg_event_mm+0xba/0x420 include/linux/memcontrol.h:1074
 mm_account_fault mm/memory.c:5558 [inline]
 handle_mm_fault+0x16c4/0x1ba0 mm/memory.c:5705
 faultin_page mm/gup.c:1305 [inline]
 __get_user_pages+0x6ec/0x16a0 mm/gup.c:1604
 populate_vma_page_range+0x264/0x330 mm/gup.c:2043
 __mm_populate+0x27a/0x460 mm/gup.c:2146
 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: 0033:0x7fcaed575bd9
RSP: 002b:00007fcaee393048 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fcaed703f60 RCX: 00007fcaed575bd9
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007fcaed5e4e60 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fcaed703f60 R15: 00007fff94397b58
 </TASK>
task:syz-executor    state:R  running task     stack:20288 pid:7777  tgid:7777  ppid:7760   flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5407 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6748
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6927
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6951
 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:745 [inline]
 dup_mm kernel/fork.c:1668 [inline]
 copy_mm+0x11ea/0x1f30 kernel/fork.c:1717
 copy_process+0x187a/0x3dc0 kernel/fork.c:2370
 kernel_clone+0x226/0x8f0 kernel/fork.c:2777
 __do_sys_clone kernel/fork.c:2920 [inline]
 __se_sys_clone kernel/fork.c:2904 [inline]
 __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2904
 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: 0033:0x7f80e996c4d3
RSP: 002b:00007fffbdda9ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80e996c4d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 000055555da027d0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10545 jiffies! g51481 f0x0 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:24912 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5407 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6748
 __schedule_loop kernel/sched/core.c:6825 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6840
 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 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111
sched: RT throttling activated