rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5098/1:b..l P5456/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=8421, q=692 ncpus=2)
task:syz.2.83        state:R  running task     stack:23792 pid:5456  tgid:5446  ppid:5094   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5407 [inline]
 __schedule+0x17ae/0x4a10 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:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 fa 4b 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:ffffc90009b974c0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92001372ea4 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8bcacdc0 RDI: ffffffff8c1f5560
RBP: ffffc90009b97608 R08: ffffffff92f7c5c7 R09: 1ffffffff25ef8b8
R10: dffffc0000000000 R11: fffffbfff25ef8b9 R12: 1ffff92001372ea0
R13: dffffc0000000000 R14: ffffc90009b97520 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:327 [inline]
 rcu_read_lock include/linux/rcupdate.h:839 [inline]
 mt_find+0x247/0x850 lib/maple_tree.c:6933
 find_vma+0xf9/0x170 mm/mmap.c:1948
 lock_mm_and_find_vma+0x5f/0x2f0 mm/memory.c:5779
 do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71
Code: 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 cc cc cc cc 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1
RSP: 0018:ffffc90009b97958 EFLAGS: 00050206
RAX: ffff88801294c001 RBX: 000000002015fe80 RCX: 0000000000000e80
RDX: 0000000000000000 RSI: ffff88801294c180 RDI: 000000002015f000
RBP: ffffc90009b97ad8 R08: ffff88801294cfff R09: 1ffff110025299ff
R10: dffffc0000000000 R11: ffffed1002529a00 R12: dffffc0000000000
R13: 1ffff92001372f40 R14: 0000000000001000 R15: ffff88801294c000
 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
 copy_to_user_iter lib/iov_iter.c:25 [inline]
 iterate_iovec include/linux/iov_iter.h:51 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:247 [inline]
 iterate_and_advance include/linux/iov_iter.h:271 [inline]
 _copy_to_iter+0x4c0/0x1960 lib/iov_iter.c:185
 copy_page_to_iter+0xb1/0x160 lib/iov_iter.c:362
 process_vm_rw_pages mm/process_vm_access.c:45 [inline]
 process_vm_rw_single_vec mm/process_vm_access.c:118 [inline]
 process_vm_rw_core mm/process_vm_access.c:216 [inline]
 process_vm_rw+0x871/0xcf0 mm/process_vm_access.c:284
 __do_sys_process_vm_readv mm/process_vm_access.c:296 [inline]
 __se_sys_process_vm_readv mm/process_vm_access.c:292 [inline]
 __x64_sys_process_vm_readv+0xe0/0x100 mm/process_vm_access.c:292
 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: 0033:0x7fe25e375a19
RSP: 002b:00007fe25ddff048 EFLAGS: 00000246 ORIG_RAX: 0000000000000136
RAX: ffffffffffffffda RBX: 00007fe25e504038 RCX: 00007fe25e375a19
RDX: 0000000000000002 RSI: 0000000020008400 RDI: 0000000000000020
RBP: 00007fe25e3e4e49 R08: 0000000000000286 R09: 0000000000000000
R10: 0000000020008640 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fe25e504038 R15: 00007fffb9f54fa8
 </TASK>
task:syz-executor    state:R  running task     stack:18864 pid:5098  tgid:5098  ppid:5079   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5407 [inline]
 __schedule+0x17ae/0x4a10 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+0x223/0x870 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: 0033:0x7fa94c36c313
RSP: 002b:00007ffc75bbcdd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa94c36c313
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 000055557920e7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10202 jiffies! g8421 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:24176 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5407 [inline]
 __schedule+0x17ae/0x4a10 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+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:106 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111
sched: RT throttling activated