rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4481/1:b..l (detected by 1, t=10504 jiffies, g=7565, q=3600) task:syz.4.57 state:R running task stack:24768 pid: 4481 ppid: 4193 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5030 [inline] __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6780 irqentry_exit+0x63/0x70 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:seqcount_lockdep_reader_access+0x126/0x170 include/linux/seqlock.h:106 Code: 9b ca ff 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 47 41 f7 c5 00 02 00 00 74 01 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 27 00 00 00 00 66 43 c7 44 27 09 00 00 43 c6 44 27 0b 00 RSP: 0018:ffffc9000349f2e0 EFLAGS: 00000206 RAX: 063846e9067df500 RBX: ffff88813fffb7c0 RCX: 063846e9067df500 RDX: dffffc0000000000 RSI: ffffffff8a0b15c0 RDI: ffffffff8a599340 RBP: ffffc9000349f3a0 R08: dffffc0000000000 R09: ffffed101720765a R10: ffffed101720765a R11: 1ffff11017207659 R12: dffffc0000000000 R13: 0000000000000a06 R14: ffffffff81b342f7 R15: 1ffff92000693e5c read_seqbegin include/linux/seqlock.h:897 [inline] zone_span_seqbegin include/linux/memory_hotplug.h:83 [inline] page_outside_zone_boundaries mm/page_alloc.c:580 [inline] bad_range+0x77/0x2d0 mm/page_alloc.c:607 rmqueue mm/page_alloc.c:3760 [inline] get_page_from_freelist+0x1b56/0x1c60 mm/page_alloc.c:4189 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5474 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1975 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x195/0x290 mm/slub.c:3233 skb_clone+0x1bd/0x350 net/core/skbuff.c:1523 ____bpf_clone_redirect net/core/filter.c:2438 [inline] bpf_clone_redirect+0xa9/0x390 net/core/filter.c:2423 bpf_prog_b36a1f39e2fdd4f4+0x56/0x7a0 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:621 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_test_run+0x498/0x7d0 net/bpf/test_run.c:119 bpf_prog_test_run_skb+0x9cc/0x1180 net/bpf/test_run.c:669 bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3368 __sys_bpf+0x535/0x670 kernel/bpf/syscall.c:4669 __do_sys_bpf kernel/bpf/syscall.c:4755 [inline] __se_sys_bpf kernel/bpf/syscall.c:4753 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4753 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f6e49d26be9 RSP: 002b:00007f6e47f8e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f6e49f4dfa0 RCX: 00007f6e49d26be9 RDX: 0000000000000050 RSI: 0000200000002300 RDI: 000000000000000a RBP: 00007f6e49da9e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6e49f4e038 R14: 00007f6e49f4dfa0 R15: 00007ffc042e91e8