On Thu, Aug 27, 2020 at 10:31 PM Kamal Heib <kamalheib1@xxxxxxxxx> wrote:
>
> On Thu, Aug 27, 2020 at 09:18:22AM -0300, Jason Gunthorpe wrote:
> > On Tue, Aug 25, 2020 at 06:17:25PM +0300, Kamal Heib wrote:
> > > To avoid the following kernel panic when calling kmem_cache_create()
> > > with a NULL pointer from pool_cache(), Block the rxe_param_set_add()
> > > from running if the rdma_rxe module is not initialized.
> > >
> > > BUG: unable to handle kernel NULL pointer dereference at 000000000000000b
> > > PGD 0 P4D 0
> > > Oops: 0000 [#1] SMP NOPTI
> > > CPU: 4 PID: 8512 Comm: modprobe Kdump: loaded Not tainted 4.18.0-231.el8.x86_64 #1
> > > Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40 10/02/2018
> > > RIP: 0010:kmem_cache_alloc+0xd1/0x1b0
> > > Code: 8b 57 18 45 8b 77 1c 48 8b 5c 24 30 0f 1f 44 00 00 5b 48 89 e8 5d 41 5c 41 5d 41 5e 41 5f c3 81 e3 00 00 10 00 75 0e 4d 89 fe <41> f6 47 0b 04 0f 84 6c ff ff ff 4c 89 ff e8 cc da 01 00 49 89 c6
> > > RSP: 0018:ffffa2b8c773f9d0 EFLAGS: 00010246
> > > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000005
> > > RDX: 0000000000000004 RSI: 00000000006080c0 RDI: 0000000000000000
> > > RBP: ffff8ea0a8634fd0 R08: ffffa2b8c773f988 R09: 00000000006000c0
> > > R10: 0000000000000000 R11: 0000000000000230 R12: 00000000006080c0
> > > R13: ffffffffc0a97fc8 R14: 0000000000000000 R15: 0000000000000000
> > > FS: 00007f9138ed9740(0000) GS:ffff8ea4ae800000(0000) knlGS:0000000000000000
> > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > CR2: 000000000000000b CR3: 000000046d59a000 CR4: 00000000003406e0
> > > Call Trace:
> > > rxe_alloc+0xc8/0x160 [rdma_rxe]
> > > rxe_get_dma_mr+0x25/0xb0 [rdma_rxe]
> > > __ib_alloc_pd+0xcb/0x160 [ib_core]
> > > ib_mad_init_device+0x296/0x8b0 [ib_core]
> > > add_client_context+0x11a/0x160 [ib_core]
> > > enable_device_and_get+0xdc/0x1d0 [ib_core]
> > > ib_register_device+0x572/0x6b0 [ib_core]
> > > ? crypto_create_tfm+0x32/0xe0
> > > ? crypto_create_tfm+0x7a/0xe0
> > > ? crypto_alloc_tfm+0x58/0xf0
> > > rxe_register_device+0x19d/0x1c0 [rdma_rxe]
> > > rxe_net_add+0x3d/0x70 [rdma_rxe]
> > > ? dev_get_by_name_rcu+0x73/0x90
> > > rxe_param_set_add+0xaf/0xc0 [rdma_rxe]
> > > parse_args+0x179/0x370
> > > ? ref_module+0x1b0/0x1b0
> > > load_module+0x135e/0x17e0
> > > ? ref_module+0x1b0/0x1b0
> > > ? __do_sys_init_module+0x13b/0x180
> > > __do_sys_init_module+0x13b/0x180
> > > do_syscall_64+0x5b/0x1a0
> > > entry_SYSCALL_64_after_hwframe+0x65/0xca
> > > RIP: 0033:0x7f9137ed296e
> > >
> > > Fixes: 8700e3e7c485 ("Soft RoCE driver")
> > > Signed-off-by: Kamal Heib <kamalheib1@xxxxxxxxx>
> > > ---
> > > drivers/infiniband/sw/rxe/rxe.c | 4 ++++
> > > drivers/infiniband/sw/rxe/rxe.h | 2 ++
> > > drivers/infiniband/sw/rxe/rxe_sysfs.c | 5 +++++
> > > 3 files changed, 11 insertions(+)
> >
> > Can you send a PR to rdma-core to delete rxe_cfg as well? In
> > preperation to remove the module parameters
> >
>
> Someone already did that :-)
>
> commit 0d2ff0e1502ebc63346bc9ffd37deb3c4fd0dbc9
> Author: Jason Gunthorpe <jgg@xxxxxxxx>
> Date: Tue Jan 28 15:53:07 2020 -0400
>
> rxe: Remove rxe_cfg
Now rdma link add is the only choice.
>
> This is obsoleted by iproute2's 'rdma link add' command.
>
> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
>
> Thanks,
> Kamal
>
> > Applied to for-rc
> >
> > Thanks,
> > Jason
