rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13876/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=77645, q=213 ncpus=2)
task:syz.4.2245      state:R  running task     stack:23568 pid:13876 tgid:13875 ppid:9139   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 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:lockdep_enabled kernel/locking/lockdep.c:121 [inline]
RIP: 0010:lock_release+0x12a/0xa30 kernel/locking/lockdep.c:5772
Code: 7e 85 c0 0f 85 46 05 00 00 65 48 8b 04 25 c0 d6 03 00 48 89 44 24 20 48 8d 98 dc 0a 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 0f 85 fb 05 00 00 83 3b 00 0f 85 14 05 00 00 4c 89 f0 48 c1
RSP: 0000:ffffc9000b20f280 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffff8880235228dc RCX: ffffffff816ff2f0
RDX: 0000000000000000 RSI: ffffffff8c3f9be0 RDI: ffffffff8c3f9ba0
RBP: ffffc9000b20f3b0 R08: ffffffff8ff6ccaf R09: 1ffffffff1fed995
R10: dffffc0000000000 R11: fffffbfff1fed996 R12: 1ffff92001641e5c
R13: ffffffff81de6b54 R14: ffffffff8e738320 R15: dffffc0000000000
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 count_memcg_event_mm+0x3bd/0x420 include/linux/memcontrol.h:1021
 mm_account_fault mm/memory.c:5698 [inline]
 handle_mm_fault+0x149a/0x1880 mm/memory.c:5858
 faultin_page mm/gup.c:1194 [inline]
 __get_user_pages+0x6ec/0x16a0 mm/gup.c:1493
 __get_user_pages_locked mm/gup.c:1760 [inline]
 faultin_page_range+0x204/0x850 mm/gup.c:1984
 madvise_populate mm/madvise.c:943 [inline]
 do_madvise+0x60d/0x4760 mm/madvise.c:1464
 __do_sys_madvise mm/madvise.c:1484 [inline]
 __se_sys_madvise mm/madvise.c:1482 [inline]
 __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:1482
 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: 0033:0x7f4625579ef9
RSP: 002b:00007f4626283038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f4625715f80 RCX: 00007f4625579ef9
RDX: 0000000000000017 RSI: 0000000000800000 RDI: 00000000200ec000
RBP: 00007f46255e793e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4625715f80 R15: 00007ffedeb8b8b8
 </TASK>
rcu: rcu_preempt kthread starved for 10527 jiffies! g77645 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:25328 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 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+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 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:106 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111