rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4805/1:b.el (detected by 1, t=10505 jiffies, g=7013, q=2369) task:syz.2.230 state:R running task stack:24928 pid: 4805 ppid: 4188 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5049 [inline] __schedule+0x11bb/0x4390 kernel/sched/core.c:6395 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799 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:__sanitizer_cov_trace_pc+0x45/0x60 kernel/kcov.c:212 Code: 81 fa 00 01 00 00 75 35 83 b9 34 16 00 00 00 74 2c 8b 91 10 16 00 00 83 fa 02 75 21 48 8b 91 18 16 00 00 48 8b 32 48 8d 7e 01 <8b> 89 14 16 00 00 48 39 cf 73 08 48 89 44 f2 08 48 89 3a c3 0f 1f RSP: 0018:ffffc90002ccf7c0 EFLAGS: 00000246 RAX: ffffffff87d221f3 RBX: ffff88805cca7b40 RCX: ffff888024293b80 RDX: ffffc90005959000 RSI: 0000000000051e7d RDI: 0000000000051e7e RBP: 0000000000000401 R08: dffffc0000000000 R09: ffffed1004852771 R10: ffffed1004852771 R11: 1ffff11004852770 R12: dffffc0000000000 R13: 0000000000000401 R14: 0000000000000000 R15: 1ffff1100b994f76 skb_ensure_writable+0x23/0x450 net/core/skbuff.c:5780 __bpf_try_make_writable net/core/filter.c:1667 [inline] __bpf_skb_change_tail+0x26d/0xa90 net/core/filter.c:3758 ____bpf_skb_change_tail net/core/filter.c:3773 [inline] bpf_skb_change_tail+0x30/0x1b0 net/core/filter.c:3770 bpf_prog_43c9883b9b9aad2d+0x59/0xb04 bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_test_run+0x292/0x7d0 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:3374 __sys_bpf+0x535/0x670 kernel/bpf/syscall.c:4675 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 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: 0033:0x7f7fd37b1ba9 RSP: 002b:00007f7fd1a19038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f7fd39f8fa0 RCX: 00007f7fd37b1ba9 RDX: 0000000000000048 RSI: 00002000000003c0 RDI: 000000000000000a RBP: 00007f7fd3834e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7fd39f9038 R14: 00007f7fd39f8fa0 R15: 00007fff203227f8