BUG: using smp_processor_id() in preemptible [00000000] code: syz.5.5001/21145
caller is net_dm_packet_trace_kfree_skb_hit+0x119/0x350 net/core/drop_monitor.c:519
CPU: 0 UID: 0 PID: 21145 Comm: syz.5.5001 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 check_preemption_disabled+0xd2/0xe0 lib/smp_processor_id.c:47
 net_dm_packet_trace_kfree_skb_hit+0x119/0x350 net/core/drop_monitor.c:519
 __do_trace_kfree_skb include/trace/events/skb.h:24 [inline]
 trace_kfree_skb+0x18b/0x230 include/trace/events/skb.h:24
 __sk_skb_reason_drop net/core/skbuff.c:1231 [inline]
 sk_skb_reason_drop+0xb7/0x1b0 net/core/skbuff.c:1249
 kfree_skb_reason include/linux/skbuff.h:1323 [inline]
 kfree_skb include/linux/skbuff.h:1332 [inline]
 sctp_make_reassembled_event+0x840/0xb60 net/sctp/ulpqueue.c:361
 sctp_ulpq_retrieve_reassembled+0x287/0x710 net/sctp/ulpqueue.c:493
 sctp_ulpq_reasm net/sctp/ulpqueue.c:584 [inline]
 sctp_ulpq_tail_data+0x83b/0xfe0 net/sctp/ulpqueue.c:98
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1470 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline]
 sctp_do_sm+0x4376/0x5c30 net/sctp/sm_sideeffect.c:1175
 sctp_assoc_bh_rcv+0x392/0x740 net/sctp/associola.c:1048
 sctp_inq_push+0x25c/0x320 net/sctp/inqueue.c:91
 sctp_backlog_rcv+0x169/0x590 net/sctp/input.c:331
 sk_backlog_rcv include/net/sock.h:1190 [inline]
 __release_sock+0x3a2/0x440 net/core/sock.c:3263
 release_sock+0x1e5/0x280 net/core/sock.c:3862
 sctp_sendmsg+0x1166/0x22e0 net/sctp/socket.c:2044
 inet_sendmsg+0x11c/0x140 net/ipv4/af_inet.c:865
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 __sys_sendto+0x453/0x4e0 net/socket.c:2281
 __do_sys_sendto net/socket.c:2288 [inline]
 __se_sys_sendto net/socket.c:2284 [inline]
 __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2284
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb7bd39e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb7be2cd028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fb7bd626180 RCX: 00007fb7bd39e159
RDX: 000000000000ffe0 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007fb7bd43503b R08: 0000200000000140 R09: 000000000000001c
R10: 000000002000c851 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb7bd626218 R14: 00007fb7bd626180 R15: 00007ffdba47ad18
 </TASK>