rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7448/1:b..l rcu: (detected by 1, t=10503 jiffies, g=12805, q=735 ncpus=2) task:syz.3.420 state:R running task stack:24992 pid:7448 tgid:7447 ppid:5850 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x184f/0x4c30 kernel/sched/core.c:6690 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7012 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:5829 Code: 2b 00 74 08 4c 89 f7 e8 8a 56 8e 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:ffffc9000ccc74c0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92001998ea4 RCX: 277dc7f817111200 RDX: dffffc0000000000 RSI: ffffffff8c0adc40 RDI: ffffffff8c610960 RBP: ffffc9000ccc7618 R08: ffffffff942cd807 R09: 1ffffffff2859b00 R10: dffffc0000000000 R11: fffffbfff2859b01 R12: 1ffff92001998ea0 R13: dffffc0000000000 R14: ffffc9000ccc7520 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] page_ext_get+0x3d/0x2a0 mm/page_ext.c:525 __set_page_owner+0x9e/0x800 mm/page_owner.c:322 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x303f/0x3190 mm/page_alloc.c:3457 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4733 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] pcpu_alloc_pages mm/percpu-vm.c:95 [inline] pcpu_populate_chunk+0x182/0xb60 mm/percpu-vm.c:285 pcpu_alloc_noprof+0xb9f/0x16b0 mm/percpu.c:1879 bpf_map_alloc_percpu+0xdc/0x1d0 kernel/bpf/syscall.c:466 bpf_array_alloc_percpu kernel/bpf/arraymap.c:38 [inline] array_map_alloc+0x394/0x720 kernel/bpf/arraymap.c:152 map_create+0x946/0x11c0 kernel/bpf/syscall.c:1341 __sys_bpf+0x6d1/0x810 kernel/bpf/syscall.c:5635 __do_sys_bpf kernel/bpf/syscall.c:5760 [inline] __se_sys_bpf kernel/bpf/syscall.c:5758 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5758 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: 0033:0x7f252fd7e719 RSP: 002b:00007f2530b88038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f252ff35f80 RCX: 00007f252fd7e719 RDX: 0000000000000048 RSI: 0000000020000b00 RDI: 2000000000000000 RBP: 00007f252fdf139e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f252ff35f80 R15: 00007fff0e674538