BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor/5601 caller is net_dm_packet_trace_kfree_skb_hit+0xdf/0x350 net/core/drop_monitor.c:519 CPU: 0 UID: 0 PID: 5601 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 check_preemption_disabled+0xcd/0xd0 lib/smp_processor_id.c:47 net_dm_packet_trace_kfree_skb_hit+0xdf/0x350 net/core/drop_monitor.c:519 __do_trace_kfree_skb include/trace/events/skb.h:24 [inline] trace_kfree_skb+0x1d1/0x210 include/trace/events/skb.h:24 __sk_skb_reason_drop net/core/skbuff.c:1231 [inline] sk_skb_reason_drop+0xdd/0x110 net/core/skbuff.c:1249 tcp_data_queue+0xb80/0x5fa0 net/ipv4/tcp_input.c:5709 tcp_rcv_established+0xe45/0x2910 net/ipv4/tcp_input.c:6689 tcp_v4_do_rcv+0x959/0x13f0 net/ipv4/tcp_ipv4.c:1854 sk_backlog_rcv include/net/sock.h:1192 [inline] __release_sock+0x28e/0x3d0 net/core/sock.c:3263 release_sock+0x1be/0x290 net/core/sock.c:3862 tcp_recvmsg+0x106/0x540 net/ipv4/tcp.c:2946 sock_recvmsg_nosec net/socket.c:1153 [inline] sock_recvmsg+0x166/0x1e0 net/socket.c:1173 sock_read_iter+0x233/0x300 net/socket.c:1242 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x59e/0xa90 fs/read_write.c:574 ksys_read+0x156/0x270 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f32ab5392d7 Code: 48 89 fa 4c 89 df e8 a8 56 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffceb322d90 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000555568ab5540 RCX: 00007f32ab5392d7 RDX: 0000000000000004 RSI: 00007ffceb322dec RDI: 0000000000000003 RBP: 00007ffceb323290 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 R13: 00007ffceb322dec R14: 00007ffceb322e80 R15: 0000000000000000