infiniband sqz0: set down
infiniband sqz0: added lo
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.2.1017/9780 is trying to acquire lock:
ffffffff8ea5f8c0 (pcpu_alloc_mutex){+.+.}-{4:4}, at: pcpu_alloc_noprof+0x261/0x19c0

but task is already holding lock:
ffffffff8e7fae60 (wq_pool_mutex){+.+.}-{4:4}, at: __alloc_workqueue+0x9f8/0x1f40

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #8 (wq_pool_mutex){+.+.}-{4:4}:
       __mutex_lock+0x1a3/0x1550
       __alloc_workqueue+0x9f8/0x1f40
       alloc_workqueue_noprof+0xe3/0x210
       padata_alloc+0xc1/0x360
       pcrypt_init_padata+0x27/0x100
       pcrypt_init+0x60/0xc0
       do_one_initcall+0x250/0x870
       do_initcall_level+0x104/0x190
       do_initcalls+0x59/0xa0
       kernel_init_freeable+0x2a6/0x3e0
       kernel_init+0x1d/0x1d0
       ret_from_fork+0x514/0xb70
       ret_from_fork_asm+0x1a/0x30

-> #7 (cpu_hotplug_lock){++++}-{0:0}:
       cpus_read_lock+0x42/0x160
       static_key_slow_inc+0x12/0x30
       nbd_genl_reconfigure+0x132f/0x1ea0
       genl_family_rcv_msg_doit+0x22a/0x330
       genl_rcv_msg+0x61c/0x7a0
       netlink_rcv_skb+0x232/0x4b0
       genl_rcv+0x28/0x40
       netlink_unicast+0x75c/0x8e0
       netlink_sendmsg+0x813/0xb40
       ____sys_sendmsg+0x972/0x9f0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #6 (&nsock->tx_lock){+.+.}-{4:4}:
       __mutex_lock+0x1a3/0x1550
       nbd_queue_rq+0x37b/0x1100
       blk_mq_dispatch_rq_list+0xa70/0x1910
       __blk_mq_sched_dispatch_requests+0xdcc/0x1600
       blk_mq_sched_dispatch_requests+0xd7/0x190
       blk_mq_run_hw_queue+0x348/0x4f0
       blk_mq_dispatch_list+0xd16/0xe10
       blk_mq_flush_plug_list+0x48d/0x570
       __blk_flush_plug+0x3ed/0x4d0
       __submit_bio+0x28d/0x580
       submit_bio_noacct_nocheck+0x2f4/0xa40
       block_read_full_folio+0x599/0x830
       filemap_read_folio+0x137/0x3b0
       do_read_cache_folio+0x358/0x590
       read_part_sector+0xb6/0x2b0
       adfspart_check_ICS+0xb1/0x960
       bdev_disk_changed+0x817/0x1770
       blkdev_get_whole+0x380/0x510
       bdev_open+0x31e/0xd30
       blkdev_open+0x470/0x610
       do_dentry_open+0x785/0x14e0
       vfs_open+0x3b/0x340
       path_openat+0x2e08/0x3860
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #5 (&cmd->lock){+.+.}-{4:4}:
       __mutex_lock+0x1a3/0x1550
       nbd_queue_rq+0xc6/0x1100
       blk_mq_dispatch_rq_list+0xa70/0x1910
       __blk_mq_sched_dispatch_requests+0xdcc/0x1600
       blk_mq_sched_dispatch_requests+0xd7/0x190
       blk_mq_run_hw_queue+0x348/0x4f0
       blk_mq_dispatch_list+0xd16/0xe10
       blk_mq_flush_plug_list+0x48d/0x570
       __blk_flush_plug+0x3ed/0x4d0
       __submit_bio+0x28d/0x580
       submit_bio_noacct_nocheck+0x2f4/0xa40
       block_read_full_folio+0x599/0x830
       filemap_read_folio+0x137/0x3b0
       do_read_cache_folio+0x358/0x590
       read_part_sector+0xb6/0x2b0
       adfspart_check_ICS+0xb1/0x960
       bdev_disk_changed+0x817/0x1770
       blkdev_get_whole+0x380/0x510
       bdev_open+0x31e/0xd30
       blkdev_open+0x470/0x610
       do_dentry_open+0x785/0x14e0
       vfs_open+0x3b/0x340
       path_openat+0x2e08/0x3860
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #4 (set->srcu){.+.+}-{0:0}:
       __synchronize_srcu+0xca/0x300
       elevator_switch+0x1e8/0x7a0
       elevator_change+0x2cc/0x450
       elevator_set_default+0x36c/0x430
       blk_register_queue+0x3e9/0x4e0
       __add_disk+0x677/0xd50
       add_disk_fwnode+0xfb/0x480
       nbd_dev_add+0x72c/0xb50
       nbd_init+0x168/0x1f0
       do_one_initcall+0x250/0x870
       do_initcall_level+0x104/0x190
       do_initcalls+0x59/0xa0
       kernel_init_freeable+0x2a6/0x3e0
       kernel_init+0x1d/0x1d0
       ret_from_fork+0x514/0xb70
       ret_from_fork_asm+0x1a/0x30

-> #3 (&q->elevator_lock){+.+.}-{4:4}:
       __mutex_lock+0x1a3/0x1550
       elevator_change+0x1b3/0x450
       elevator_set_none+0xb5/0x140
       blk_mq_update_nr_hw_queues+0x5e7/0x1a60
       nbd_start_device+0x17f/0xb10
       nbd_genl_connect+0x165b/0x1cf0
       genl_family_rcv_msg_doit+0x22a/0x330
       genl_rcv_msg+0x61c/0x7a0
       netlink_rcv_skb+0x232/0x4b0
       genl_rcv+0x28/0x40
       netlink_unicast+0x75c/0x8e0
       netlink_sendmsg+0x813/0xb40
       ____sys_sendmsg+0x972/0x9f0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&q->q_usage_counter(io)#49){++++}-{0:0}:
       blk_alloc_queue+0x546/0x680
       __blk_mq_alloc_disk+0x197/0x390
       nbd_dev_add+0x499/0xb50
       nbd_init+0x168/0x1f0
       do_one_initcall+0x250/0x870
       do_initcall_level+0x104/0x190
       do_initcalls+0x59/0xa0
       kernel_init_freeable+0x2a6/0x3e0
       kernel_init+0x1d/0x1d0
       ret_from_fork+0x514/0xb70
       ret_from_fork_asm+0x1a/0x30

-> #1 (fs_reclaim){+.+.}-{0:0}:
       fs_reclaim_acquire+0x71/0x100
       prepare_alloc_pages+0x152/0x650
       __alloc_frozen_pages_noprof+0x12f/0x380
       __alloc_pages_noprof+0x10/0x100
       pcpu_populate_chunk+0x182/0xb30
       pcpu_alloc_noprof+0xcc2/0x19c0
       xt_percpu_counter_alloc+0x161/0x220
       translate_table+0x1332/0x20b0
       ip6t_register_table+0x11b/0x800
       ip6table_filter_table_init+0x75/0xb0
       xt_find_table_lock+0x30c/0x3f0
       xt_request_find_table_lock+0x26/0x100
       do_ip6t_get_ctl+0x716/0x1230
       nf_getsockopt+0x26e/0x290
       ipv6_getsockopt+0x1fd/0x2b0
       do_sock_getsockopt+0x51d/0x7e0
       __x64_sys_getsockopt+0x1a4/0x240
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (pcpu_alloc_mutex){+.+.}-{4:4}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0x106/0x350
       __mutex_lock+0x1a3/0x1550
       pcpu_alloc_noprof+0x261/0x19c0
       __alloc_workqueue+0xa88/0x1f40
       alloc_workqueue_noprof+0xe3/0x210
       ib_mad_init_device+0x944/0x20a0
       add_client_context+0x37c/0x7a0
       enable_device_and_get+0x19c/0x3e0
       ib_register_device+0x110f/0x13e0
       rxe_register_device+0x1e3/0x350
       rxe_net_add+0x81/0x110
       rxe_newlink+0xf4/0x1c0
       nldev_newlink+0x5bc/0x650
       rdma_nl_rcv+0x6d1/0xa10
       netlink_unicast+0x75c/0x8e0
       netlink_sendmsg+0x813/0xb40
       ____sys_sendmsg+0x972/0x9f0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  pcpu_alloc_mutex --> cpu_hotplug_lock --> wq_pool_mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(wq_pool_mutex);
                               lock(cpu_hotplug_lock);
                               lock(wq_pool_mutex);
  lock(pcpu_alloc_mutex);

 *** DEADLOCK ***

6 locks held by syz.2.1017/9780:
 #0: ffffffff9a7f7788 (&rdma_nl_types[idx].sem){.+.+}-{4:4}, at: rdma_nl_rcv+0x328/0xa10
 #1: ffffffff8fb31828 (link_ops_rwsem){++++}-{4:4}, at: nldev_newlink+0x429/0x650
 #2: ffffffff8fb22e28 (devices_rwsem){++++}-{4:4}, at: enable_device_and_get+0xff/0x3e0
 #3: ffffffff8fb23128 (clients_rwsem){++++}-{4:4}, at: enable_device_and_get+0x165/0x3e0
 #4: ffff888023298620 (&device->client_data_rwsem){++++}-{4:4}, at: add_client_context+0x33c/0x7a0
 #5: ffffffff8e7fae60 (wq_pool_mutex){+.+.}-{4:4}, at: __alloc_workqueue+0x9f8/0x1f40

stack backtrace:
CPU: 1 UID: 0 PID: 9780 Comm: syz.2.1017 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
 print_circular_bug+0x2e1/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a5/0x2cf0
 lock_acquire+0x106/0x350
 __mutex_lock+0x1a3/0x1550
 pcpu_alloc_noprof+0x261/0x19c0
 __alloc_workqueue+0xa88/0x1f40
 alloc_workqueue_noprof+0xe3/0x210
 ib_mad_init_device+0x944/0x20a0
 add_client_context+0x37c/0x7a0
 enable_device_and_get+0x19c/0x3e0
 ib_register_device+0x110f/0x13e0
 rxe_register_device+0x1e3/0x350
 rxe_net_add+0x81/0x110
 rxe_newlink+0xf4/0x1c0
 nldev_newlink+0x5bc/0x650
 rdma_nl_rcv+0x6d1/0xa10
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4fb2d9cdd9
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:00007f4fb3c1c028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f4fb3015fa0 RCX: 00007f4fb2d9cdd9
RDX: 0000000000000810 RSI: 0000200000000240 RDI: 0000000000000006
RBP: 00007f4fb2e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4fb3016038 R14: 00007f4fb3015fa0 R15: 00007ffed649d158
 </TASK>
workqueue: Failed to create a rescuer kthread for wq "ib_mad1": -EINTR
infiniband sqz0: Couldn't open port 1
smbdirect: ib_dev[sqz0]: added: IB_CA max_fast_reg_page_list_len=512 device_cap_flags=0x1c001223c76 kernel_cap_flags=0x14 page_size_cap=0xfffff000
smbdirect: ib_dev[sqz0]: num_ports=1 max_qp_rd_atom=128 max_qp_init_rd_atom=128 max_sgl_rd=0 max_sge_rd=32 max_cqe=32767 max_qp_wr=1048576 max_send_sge=32 max_recv_sge=32
smbdirect: ib_dev[sqz0]PORT[1]: iwarp=0 ib=0 roce=1 v1=0 v2=1 core_cap_flags=0x803005
RDS/IB: sqz0: added
smc: adding ib device sqz0 with port count 1
smc:    ib device sqz0 port 1 has no pnetid
lo speed is unknown, defaulting to 1000
lo speed is unknown, defaulting to 1000
lo speed is unknown, defaulting to 1000
