BUG: MAX_LOCKDEP_KEYS too low!
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 10063 Comm: syz.3.3781 Not tainted syzkaller #0 PREEMPT(full) 
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
 register_lock_class+0x5e6/0x7b0 kernel/locking/lockdep.c:1348
 __lock_acquire+0x3e7/0x1ec0 kernel/locking/lockdep.c:5128
 lock_acquire kernel/locking/lockdep.c:5908 [inline]
 lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5865
 touch_wq_lockdep_map+0xad/0x1c0 kernel/workqueue.c:4111
 __flush_workqueue+0x131/0x1200 kernel/workqueue.c:4153
 drain_workqueue+0x175/0x3b0 kernel/workqueue.c:4317
 destroy_workqueue+0xc3/0xa30 kernel/workqueue.c:6155
 __rds_conn_create+0x1671/0x25a0 net/rds/connection.c:354
 rds_conn_create_outgoing+0x44/0x60 net/rds/connection.c:377
 rds_sendmsg+0x10da/0x34d0 net/rds/send.c:1340
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2713
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2767
 __sys_sendmsg+0x160/0x210 net/socket.c:2799
 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: 0033:0x7f0d5f19e159
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:00007ffe950beb08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0d5f425fa0 RCX: 00007f0d5f19e159
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007f0d5f235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d5f425fac R14: 00007f0d5f425fa0 R15: 00007f0d5f425fa0
 </TASK>