rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P23096/1:b..l (detected by 0, t=10502 jiffies, g=172517, q=993 ncpus=2) task:syz.9.5268 state:R running task stack:25712 pid:23096 ppid:21168 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874 irqentry_exit+0x63/0x70 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:unwind_get_return_address+0x63/0x80 arch/x86/kernel/unwind_orc.c:324 Code: 48 89 df e8 3f 68 9a 00 48 8b 3b e8 97 26 1d 00 85 c0 74 14 43 80 3c 37 00 74 08 48 89 df e8 24 68 9a 00 48 8b 03 eb 02 31 c0 <5b> 41 5e 41 5f c3 89 d9 80 e1 07 80 c1 03 38 c1 7c ad 48 89 df e8 RSP: 0018:ffffc9000e08f368 EFLAGS: 00000246 RAX: ffffffff8190d82e RBX: ffffc9000e08f3d0 RCX: 0000000080000000 RDX: ffffc9000e08f301 RSI: dffffc0000000000 RDI: ffffffff8190d82e RBP: ffffc9000e08f410 R08: ffffc9000e08fd38 R09: ffffc9000e08f3d8 R10: dffffc0000000000 R11: fffff52001c11e7d R12: ffff888027539dc0 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92001c11e7a arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xae/0x230 mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] pskb_expand_head+0x1a6/0x12a0 net/core/skbuff.c:1848 __bpf_try_make_writable net/core/filter.c:1674 [inline] bpf_try_make_writable net/core/filter.c:1680 [inline] bpf_try_make_head_writable net/core/filter.c:1688 [inline] ____bpf_clone_redirect net/core/filter.c:2467 [inline] bpf_clone_redirect+0x1e3/0x4a0 net/core/filter.c:2436 bpf_prog_208b094576c80b22+0x56/0x5b bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_test_run+0x2b6/0x830 net/bpf/test_run.c:402 bpf_prog_test_run_skb+0xaa6/0x12a0 net/bpf/test_run.c:1191 bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3695 __sys_bpf+0x62b/0x780 kernel/bpf/syscall.c:5049 __do_sys_bpf kernel/bpf/syscall.c:5135 [inline] __se_sys_bpf kernel/bpf/syscall.c:5133 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f16ab79c819 RSP: 002b:00007f16ac642028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f16aba15fa0 RCX: 00007f16ab79c819 RDX: 0000000000000050 RSI: 00002000000000c0 RDI: 000000000000000a RBP: 00007f16ab832c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f16aba16038 R14: 00007f16aba15fa0 R15: 00007ffed477d0c8