INFO: task kworker/u8:3:5838 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:3    state:D stack:23304 pid:5838  tgid:5838  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write+0x1bc/0x200
 rdma_dev_exit_net+0x92/0x350
 ops_undo_list+0x49f/0x940
 cleanup_net+0x56b/0x800
 process_scheduled_works+0xb6e/0x18c0
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.6.2488:14349 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.2488      state:D stack:24840 pid:14349 tgid:14346 ppid:11450  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write+0x1bc/0x200
 rdma_dev_exit_net+0x92/0x350
 ops_undo_list+0x49f/0x940
 setup_net+0x2f0/0x340
 copy_net_ns+0x50e/0x730
 create_new_namespaces+0x3e7/0x6a0
 copy_namespaces+0x438/0x4b0
 copy_process+0x18e2/0x3cd0
 kernel_clone+0x248/0x8e0
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f69df59c799
RSP: 002b:00007f69dd7b3fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f69df816180 RCX: 00007f69df59c799
RDX: 00002000000002c0 RSI: 0000200000000280 RDI: 0000000040001200
RBP: 00007f69df632c99 R08: 0000200000000340 R09: 0000200000000340
R10: 0000200000000300 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f69df816218 R14: 00007f69df816180 R15: 00007ffd46076538
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5631:
 #0: ffff8881132390a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900035762f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
1 lock held by syz-executor/5788:
4 locks held by kworker/u8:3/5838:
 #0: ffff8881012ae148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90006407c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbc03d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffffffff8f926e50 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x92/0x350
7 locks held by syz.8.2382/13999:
2 locks held by syz.6.2488/14349:
 #0: ffffffff8fbc03d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f926e50 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x92/0x350
3 locks held by syz-executor/14489:
 #0: ffffffff8fbc03d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f926c90 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x200/0x2f0
 #2: ffffffff8f926e50 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x238/0x2f0
3 locks held by syz-executor/14652:
 #0: ffffffff8fbc03d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f926c90 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x200/0x2f0
 #2: ffffffff8f926e50 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x238/0x2f0
3 locks held by syz-executor/14658:
 #0: ffffffff8fbc03d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f926c90 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x200/0x2f0
 #2: ffffffff8f926e50 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x238/0x2f0
3 locks held by syz-executor/14666:
 #0: ffffffff8fbc03d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f926c90 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x200/0x2f0
 #2: ffffffff8f926e50 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x238/0x2f0
3 locks held by syz-executor/14676:
 #0: ffffffff8fbc03d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f926c90 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x200/0x2f0
 #2: ffffffff8f926e50 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x238/0x2f0
3 locks held by syz-executor/14681:
 #0: ffffffff8fbc03d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f926c90 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x200/0x2f0
 #2: ffffffff8f926e50 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x238/0x2f0
3 locks held by syz-executor/14684:
 #0: ffffffff8fbc03d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f926c90 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x200/0x2f0
 #2: ffffffff8f926e50 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x238/0x2f0

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 Comm: khungtaskd 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
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13999 Comm: syz.8.2382 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
RIP: 0010:stack_trace_consume_entry+0x0/0x280
Code: f0 5b 41 5e 5d c3 cc cc cc cc cc e8 ea 0d fe 09 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 ba 00 00
RSP: 0018:ffffc9000719e240 EFLAGS: 00000286
RAX: ffffffff89bde7af RBX: ffffc9000719e300 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff89bde7af RDI: ffffc9000719e300
RBP: ffffc9000719e2d0 R08: ffffc9000719f7b0 R09: 0000000000000000
R10: ffffc9000719e298 R11: ffffffff81b0c390 R12: ffff888116410000
R13: ffff888169941690 R14: ffffffff81b0c390 R15: ffffc9000719e248
FS:  00007feaab99c6c0(0000) GS:ffff8882a945a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f24a8347e20 CR3: 000000016d7aa000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 arch_stack_walk+0x10f/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x2bc/0x650
 __kernfs_new_node+0xe9/0x8e0
 kernfs_new_node+0x102/0x210
 __kernfs_create_file+0x4b/0x2e0
 sysfs_add_file_mode_ns+0x238/0x300
 internal_create_group+0x673/0x1180
 sysfs_create_groups+0x59/0x120
 ib_setup_port_attrs+0x170d/0x2380
 add_one_compat_dev+0x448/0x650
 enable_device_and_get+0x2b3/0x3e0
 ib_register_device+0x110f/0x13e0
 rxe_register_device+0x1e3/0x350
 rxe_net_add+0x81/0x110
 rxe_newlink+0xdd/0x190
 nldev_newlink+0x5bd/0x650
 rdma_nl_rcv+0x6d7/0xa10
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feaaab9c799
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:00007feaab99c028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007feaaae15fa0 RCX: 00007feaaab9c799
RDX: 0000000000004000 RSI: 0000200000000180 RDI: 0000000000000009
RBP: 00007feaaac32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feaaae16038 R14: 00007feaaae15fa0 R15: 00007ffdfefbec88
 </TASK>
