On Thu, Jun 22, 2017 at 05:10:00PM +0300, Leon Romanovsky wrote:
> From: yonatanc <yonatanc@xxxxxxxxxxxx>
>
> The RXE coupled with dummy device causes to the kernel panic attached
> below. The panic happens when ib_register_device tries to set dma_mask
> by accessing a NULLed parent device.
>
> The RXE does not actually use DMA, so we can set the dma_mask
> to architecture value.
>
> [16240.199689] RIP: 0010:ib_register_device+0x468/0x5a0 [ib_core]
> [16240.205289] RSP: 0018:ffffc9000220fc10 EFLAGS: 00010246
> [16240.209909] RAX: 0000000000000024 RBX: ffff880220d1a2a8 RCX: 0000000000000000
> [16240.212244] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000009
> [16240.214385] RBP: ffffc9000220fcb0 R08: 0000000000000000 R09: 000000000000023f
> [16240.254465] R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000
> [16240.259467] R13: 0000000000000000 R14: 0000000000000000 R15: ffff880220d1a2a8
> [16240.263314] FS: 00007fd8ecca0740(0000) GS:ffff8802364c0000(0000) knlGS:0000000000000000
> [16240.267292] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [16240.273503] CR2: 0000000000000218 CR3: 00000002253ba000 CR4: 00000000000006e0
> [16240.277066] Call Trace:
> [16240.281836] ? __kmalloc+0x26f/0x280
> [16240.286596] rxe_register_device+0x297/0x300 [rdma_rxe]
> [16240.291377] rxe_add+0x535/0x5b0 [rdma_rxe]
> [16240.297586] rxe_net_add+0x3e/0xc0 [rdma_rxe]
> [16240.302375] rxe_param_set_add+0x65/0x144 [rdma_rxe]
> [16240.307769] param_attr_store+0x68/0xd0
> [16240.311640] module_attr_store+0x1d/0x30
> [16240.316421] sysfs_kf_write+0x3a/0x50
> [16240.317802] kernfs_fop_write+0xff/0x180
> [16240.322989] __vfs_write+0x37/0x140
> [16240.328164] ? handle_mm_fault+0xce/0x240
> [16240.333340] vfs_write+0xb2/0x1b0
> [16240.335013] SyS_write+0x55/0xc0
> [16240.340632] entry_SYSCALL_64_fastpath+0x1a/0xa9
>
> Fixes: 8700e3e7c485 ("Soft RoCE driver")
> Signed-off-by: Yonatan Cohen <yonatanc@xxxxxxxxxxxx>
> Reviewed-by: Moni Shoua <monis@xxxxxxxxxxxx>
> Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
> ---
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
--
Johannes Thumshirn Storage
jthumshirn@xxxxxxx +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
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