W dniu 03.11.2014 o 12:50, Adam Mazur pisze:
W dniu 03.11.2014 o 12:27, Sagi Grimberg pisze:
On 11/3/2014 12:28 PM, Adam Mazur wrote:
Can someone help us with these crashes? We are not able to recreate it
on demand, but it takes 30 minutes to a few hours to appear the crash.
We've seen it on kernel 3.17.1 and 3.18-rc2.
Hay Adam,
CC'ing target-devel mailing list (where iser target is maintained).
So I stepped on this issue as well, and I actually have a fix for it
in the pipe. I'm planning to test it with a few other fixes for a little
while longer before I submit the code.
In general, This crash occurs due to a race between tpg shutdown (or
np disable) and RDMA_CM connect requests happening in parallel. iser
target tries to reference a tpg attribute while the np->tpg_np is
actually NULL.
How many targets/initiators/portals did you use? HCA?
Hi Sagi,
There are about 300 targets (lvm volumes), 4 initiators, two portals.
HCA by lspci:
05:00.0 InfiniBand: Mellanox Technologies MT25204 [InfiniHost III Lx
HCA] (rev 20)
Subsystem: Mellanox Technologies MT25204 [InfiniHost III Lx HCA]
Flags: bus master, fast devsel, latency 0, IRQ 46
Memory at df500000 (64-bit, non-prefetchable) [size=1M]
Memory at de800000 (64-bit, prefetchable) [size=8M]
Capabilities: [40] Power Management version 2
Capabilities: [48] Vital Product Data
Capabilities: [90] MSI: Enable- Count=1/32 Maskable- 64bit+
Capabilities: [84] MSI-X: Enable+ Count=32 Masked-
Capabilities: [60] Express Endpoint, MSI 00
Kernel driver in use: ib_mthca
root@portal-1:~# mstflint -d 05:00.0 q
Image type: Failsafe
FW Version: 1.2.0
I.S. Version: 1
Device ID: 25204
Chip Revision: A0
Description: Node Port1 Sys image
GUIDs: 0005ad00000c75c8 0005ad00000c75c9 0005ad00000c75cb
Board ID: (MT_0260000002)
VSD:
PSID: MT_0260000002
root@portal-2:~# mstflint -d 05:00.0 q
Image type: Failsafe
I.S. Version: 1
Chip Revision: A0
Description: Node Port1 Sys image
GUIDs: 0005ad00000c7010 0005ad00000c7011 0005ad00000c7013
Board ID: (MT_0260000002)
VSD:
PSID: MT_0260000002
Would it be possible to send you some patches to test as well?
Absolutely, we can immediately test any patch on any kernel version.
Thanks
Adam
The race is supposedly caused by login ddos of initiators that are not
PI aware - our initiators were running kernels from 3.2 to 3.17. When
we've upgraded all to kernels > 3.15 new targets seem to be stable.
However it shows that the race is lurking somewhere as You have pointed
out. Thank You for the feedback received. Later we will try to prepare a
testcase that might expose the crash.
Best,
Adam
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