[openib-general] [rdma_ucm] enabling the rdma_ucm and restarting the driver several times causes kernel oops

[Sean Hefty]

Dotan Barak wrote:
> here is the backtrace from the /var/log/messages:
> Dec 27 15:36:25 sw086 kernel: Unable to handle kernel NULL pointer
> dereference at 0000000000000001 RIP:
> Dec 27 15:36:25 sw086 kernel:  [<0000000000000001>]
> Dec 27 15:36:25 sw086 kernel: PGD 11f4c3067 PUD 11fed7067 PMD 0
> Dec 27 15:36:25 sw086 kernel: Oops: 0000 [1] SMP
> Dec 27 15:36:25 sw086 kernel: CPU 1
> Dec 27 15:36:25 sw086 kernel: Modules linked in: rdma_ucm ib_sdp rdma_cm
> iw_cm ib_addr ib_ipoib ib_mthca ib_umad ib_ucm ib_u
> verbs ib_cm ib_sa ib_mad ib_core nfsd exportfs ipv6 parport_pc lp
> parport autofs4 nfs lockd nfs_acl sunrpc dm_mirror dm_mod
> button battery asus_acpi ac uhci_hcd ehci_hcd i2c_i801 i2c_core tg3 sg
> ext3 jbd sd_mod

Can you narrow down which module unload is causing the issue?  Is anything using 
the rdma_ucm or ib_uverbs?  Is ib_sdp the first module unloaded?

- Sean