From: Zhu Yanjun <yanjun.zhu@xxxxxxxxx>
This is a dead lock problem.
The xa_lock first is acquired in this:
{SOFTIRQ-ON-W} state was registered at:
lock_acquire+0x1d2/0x5a0
_raw_spin_lock+0x33/0x80
__rxe_add_to_pool+0x183/0x230 [rdma_rxe]
__ib_alloc_pd+0xf9/0x550 [ib_core]
ib_mad_init_device+0x2d9/0xd20 [ib_core]
add_client_context+0x2fa/0x450 [ib_core]
enable_device_and_get+0x1b7/0x350 [ib_core]
ib_register_device+0x757/0xaf0 [ib_core]
rxe_register_device+0x2eb/0x390 [rdma_rxe]
rxe_net_add+0x83/0xc0 [rdma_rxe]
rxe_newlink+0x76/0x90 [rdma_rxe]
nldev_newlink+0x245/0x3e0 [ib_core]
rdma_nl_rcv_msg+0x2d4/0x790 [ib_core]
rdma_nl_rcv+0x1ca/0x3f0 [ib_core]
netlink_unicast+0x43b/0x640
netlink_sendmsg+0x7eb/0xc40
sock_sendmsg+0xe0/0x110
__sys_sendto+0x1d7/0x2b0
__x64_sys_sendto+0xdd/0x1b0
do_syscall_64+0x37/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Then xa_lock is acquired in this:
{IN-SOFTIRQ-W}:
Call Trace:
<TASK>
dump_stack_lvl+0x44/0x57
mark_lock.part.52.cold.79+0x3c/0x46
__lock_acquire+0x1565/0x34a0
lock_acquire+0x1d2/0x5a0
_raw_spin_lock_irqsave+0x42/0x90
rxe_pool_get_index+0x72/0x1d0 [rdma_rxe]
rxe_get_av+0x168/0x2a0 [rdma_rxe]
rxe_requester+0x75b/0x4a90 [rdma_rxe]
rxe_do_task+0x134/0x230 [rdma_rxe]
tasklet_action_common.isra.12+0x1f7/0x2d0
__do_softirq+0x1ea/0xa4c
run_ksoftirqd+0x32/0x60
smpboot_thread_fn+0x503/0x860
kthread+0x29b/0x340
ret_from_fork+0x1f/0x30
</TASK>
