rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P27242/2:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=195533, q=317 ncpus=2)
task:syz.3.6421      state:R  running task     stack:26384 pid:27242 tgid:27241 ppid:20253  flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x60 kernel/kcov.c:207
Code: 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 15 04 f3 75 7e 65 8b 05 05 f3 75 7e <a9> 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 1c 16 00 00
RSP: 0018:ffffc900033977c0 EFLAGS: 00000202
RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffffffff81bf92fa
RDX: ffff88801a3c1e00 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff8880673adf00 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000004 R12: 0000000000000003
R13: 0000000000000000 R14: ffffc90003397a00 R15: dffffc0000000000
 rcu_lock_release include/linux/rcupdate.h:339 [inline]
 rcu_read_unlock include/linux/rcupdate.h:812 [inline]
 filemap_map_pages+0xe33/0x1440 mm/filemap.c:3656
 do_fault_around mm/memory.c:4879 [inline]
 do_read_fault mm/memory.c:4912 [inline]
 do_fault mm/memory.c:5051 [inline]
 do_pte_missing mm/memory.c:3897 [inline]
 handle_pte_fault mm/memory.c:5381 [inline]
 __handle_mm_fault+0x3934/0x5430 mm/memory.c:5524
 handle_mm_fault+0x476/0xa00 mm/memory.c:5689
 faultin_page mm/gup.c:1290 [inline]
 __get_user_pages+0x473/0x1490 mm/gup.c:1589
 populate_vma_page_range+0x27f/0x3a0 mm/gup.c:2029
 __mm_populate+0x1d6/0x380 mm/gup.c:2132
 mm_populate include/linux/mm.h:3469 [inline]
 vm_mmap_pgoff+0x293/0x360 mm/util.c:578
 ksys_mmap_pgoff+0x7d/0x5d0 mm/mmap.c:1443
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:79 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:79
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff48e375b99
RSP: 002b:00007ff48f1c5048 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ff48e503fa0 RCX: 00007ff48e375b99
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007ff48e3f677e R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff48e503fa0 R15: 00007fffec939f98
 </TASK>
rcu: rcu_preempt kthread starved for 10103 jiffies! g195533 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:27680 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 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:86 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112