On Wed, 2018-10-10 at 09:56 +0300, Leon Romanovsky wrote:
> From: Valentine Fatiev <Valentinef@xxxxxxxxxxxx>
>
> The function that puts back the MR in cache also removes the DMA address
> from the HCA. Therefore we need to call this function before we remove
> the DMA mapping from MMU. Otherwise the HCA may access a memory that
> is no longer DMA mapped.
>
> Call trace:
> NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0.
> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.0-rc6+ #4
> Hardware name: HP ProLiant DL360p Gen8, BIOS P71 08/20/2012
> RIP: 0010:intel_idle+0x73/0x120
> Code: 80 5c 01 00 0f ae 38 0f ae f0 31 d2 65 48 8b 04 25 80 5c 01 00 48 89 d1 0f 60 02
> RSP: 0018:ffffffff9a403e38 EFLAGS: 00000046
> RAX: 0000000000000030 RBX: 0000000000000005 RCX: 0000000000000001
> RDX: 0000000000000000 RSI: ffffffff9a5790c0 RDI: 0000000000000000
> RBP: 0000000000000030 R08: 0000000000000000 R09: 0000000000007cf9
> R10: 000000000000030a R11: 0000000000000018 R12: 0000000000000000
> R13: ffffffff9a5792b8 R14: ffffffff9a5790c0 R15: 0000002b48471e4d
> FS: 0000000000000000(0000) GS:ffff9c6caf400000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f5737185000 CR3: 0000000590c0a002 CR4: 00000000000606f0
> Call Trace:
> cpuidle_enter_state+0x7e/0x2e0
> do_idle+0x1ed/0x290
> cpu_startup_entry+0x6f/0x80
> start_kernel+0x524/0x544
> ? set_init_arg+0x55/0x55
> secondary_startup_64+0xa4/0xb0
> DMAR: DRHD: handling fault status reg 2
> DMAR: [DMA Read] Request device [04:00.0] fault addr b34d2000 [fault reason 06] PTE Read access is not set
> DMAR: [DMA Read] Request device [01:00.2] fault addr bff8b000 [fault reason 06] PTE Read access is not set
>
> Fixes: f3f134f5260a ("RDMA/mlx5: Fix crash while accessing garbage pointer and freed memory")
> Signed-off-by: Valentine Fatiev <valentinef@xxxxxxxxxxxx>
> Reviewed-by: Moni Shoua <monis@xxxxxxxxxxxx>
> Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
With a fixup to the Subject of the patch to keep within git guidelines,
patch applied to for-rc.
--
Doug Ledford <dledford@xxxxxxxxxx>
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