On Mon, Jun 27, 2022 at 10:00:04PM +0800, Tao Liu wrote:
> Fix a divide 0 error in rdma_dim_stats_compare() when prev->cpe_ratio == 0.
>
> CallTrace:
> Hardware name: H3C R4900 G3/RS33M2C9S, BIOS 2.00.37P21 03/12/2020
> task: ffff880194b78000 task.stack: ffffc90006714000
> RIP: 0010:backport_rdma_dim+0x10e/0x240 [mlx_compat]
> RSP: 0018:ffff880c10e83ec0 EFLAGS: 00010202
> RAX: 0000000000002710 RBX: ffff88096cd7f780 RCX: 0000000000000064
> RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
> RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 000000001d7c6c09
> R13: ffff88096cd7f780 R14: ffff880b174fe800 R15: 0000000000000000
> FS: 0000000000000000(0000) GS:ffff880c10e80000(0000)
> knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00000000a0965b00 CR3: 000000000200a003 CR4: 00000000007606e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> Call Trace:
> <IRQ>
> ib_poll_handler+0x43/0x80 [ib_core]
> irq_poll_softirq+0xae/0x110
> __do_softirq+0xd1/0x28c
> irq_exit+0xde/0xf0
> do_IRQ+0x54/0xe0
> common_interrupt+0x8f/0x8f
> </IRQ>
> ? cpuidle_enter_state+0xd9/0x2a0
> ? cpuidle_enter_state+0xc7/0x2a0
> ? do_idle+0x170/0x1d0
> ? cpu_startup_entry+0x6f/0x80
> ? start_secondary+0x1b9/0x210
> ? secondary_startup_64+0xa5/0xb0
> Code: 0f 87 e1 00 00 00 8b 4c 24 14 44 8b 43 14 89 c8 4d 63 c8 44 29 c0 99 31 d0 29 d0 31 d2 48 98 48 8d 04 80 48 8d 04 80 48 c1 e0 02 <49> f7 f1 48 83 f8 0a 0f 86 c1 00 00 00 44 39 c1 7f 10 48 89 df
> RIP: backport_rdma_dim+0x10e/0x240 [mlx_compat] RSP: ffff880c10e83ec0
>
> Fixes: f4915455dcf0 ("linux/dim: Implement RDMA adaptive moderation (DIM)")
> Signed-off-by: Tao Liu <thomas.liu@xxxxxxxxx>
> Reviewed-by: Max Gurtovoy <mgurtovoy@xxxxxxxxxx>
> Acked-by: Leon Romanovsky <leonro@xxxxxxxxxx>
> ---
> include/linux/dim.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Jason,
Can you please pick this patch to rdma-rc as this divide-by-zero
error is caused by RDMA app?
Thanks
