BUG: using smp_processor_id() in preemptible [00000000] code: syz.3.37341/29104
caller is bpf_mem_cache_free_rcu+0x48/0xc0
CPU: 0 UID: 0 PID: 29104 Comm: syz.3.37341 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 check_preemption_disabled+0xd3/0xe0
 bpf_mem_cache_free_rcu+0x48/0xc0
 rhtab_delete_elem+0x185a/0x1b30
 __rhtab_map_lookup_and_delete_batch+0x935/0xcb0
 bpf_map_do_batch+0x445/0x630
 __sys_bpf+0x906/0xd90
 __x64_sys_bpf+0xba/0xd0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcbb339ce59
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:00007fcbb4341028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fcbb3615fa0 RCX: 00007fcbb339ce59
RDX: 0000000000000038 RSI: 00002000000018c0 RDI: 0000000000000019
RBP: 00007fcbb3432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcbb3616038 R14: 00007fcbb3615fa0 R15: 00007ffec5d6f6c8
 </TASK>
