rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7700/1:b..l rcu: (detected by 1, t=10502 jiffies, g=26033, q=286 ncpus=2) task:syz-executor.1 state:R running task stack:24112 pid:7700 tgid:7699 ppid:5791 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067 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_is_held_type+0x13b/0x190 Code: 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 42 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc9000cddf0a0 EFLAGS: 00000206 RAX: 14d293e96e6d0000 RBX: 0000000000000000 RCX: 0000000080000000 RDX: dffffc0000000000 RSI: ffffffff8bcacd00 RDI: ffffffff8c1feb80 RBP: 0000000000000002 R08: ffffffff92fa7587 R09: 1ffffffff25f4eb0 R10: dffffc0000000000 R11: fffffbfff25f4eb1 R12: 0000000000000246 R13: ffff888065dabc00 R14: 00000000ffffffff R15: ffffffff8e362018 lock_is_held include/linux/lockdep.h:231 [inline] task_css include/linux/cgroup.h:434 [inline] mem_cgroup_from_task+0x77/0x120 mm/memcontrol.c:1214 get_mem_cgroup_from_mm+0xd7/0x2a0 mm/memcontrol.c:1267 __mem_cgroup_charge+0x16/0x80 mm/memcontrol.c:7509 mem_cgroup_charge include/linux/memcontrol.h:691 [inline] shmem_alloc_and_add_folio+0x394/0xdb0 mm/shmem.c:1677 shmem_get_folio_gfp+0x82d/0x1f50 mm/shmem.c:2055 shmem_fault+0x252/0x6f0 mm/shmem.c:2255 __do_fault+0x137/0x460 mm/memory.c:4556 do_read_fault mm/memory.c:4920 [inline] do_fault mm/memory.c:5050 [inline] do_pte_missing mm/memory.c:3897 [inline] handle_pte_fault+0x3d15/0x7090 mm/memory.c:5380 __handle_mm_fault mm/memory.c:5523 [inline] handle_mm_fault+0x10df/0x1ba0 mm/memory.c:5688 faultin_page mm/gup.c:1290 [inline] __get_user_pages+0x6ef/0x1590 mm/gup.c:1589 populate_vma_page_range+0x264/0x330 mm/gup.c:2029 __mm_populate+0x27a/0x460 mm/gup.c:2132 mm_populate include/linux/mm.h:3464 [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: 0033:0x7fe2d7e7d0a9 RSP: 002b:00007fe2d8c270c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fe2d7fb3f80 RCX: 00007fe2d7e7d0a9 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 00007fe2d7eec074 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fe2d7fb3f80 R15: 00007ffff997ec38 rcu: rcu_preempt kthread starved for 10360 jiffies! g26033 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:26448 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6837 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202 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 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:112