Eric Dumazet <eduma...@google.com> writes:
> On Mon, May 9, 2016 at 6:26 PM, Huang, Ying <ying.hu...@linux.intel.com>
> wrote:
>> Hi, Eric,
>>
>> kernel test robot <ying.hu...@linux.intel.com> writes:
>>> FYI, we noticed the following commit:
>>>
>>> git://internal_merge_and_test_tree devel-catchup-201604281529
>>> commit 9317bb69824ec8d078b0b786b6971aedb0af3d4f ("net: SOCKWQ_ASYNC_NOSPACE
>>> optimizations")
>>>
>>> on test machine: vm-kbuild-2G: 2 threads qemu-system-x86_64 -enable-kvm
>>> -cpu Haswell,+smep,+smap with 2G memory
>>>
>>> caused below changes:
>>>
>>>
>>> +--------------------------------------------------+------------+------------+
>>> | | 210732d16d |
>>> 9317bb6982 |
>>> +--------------------------------------------------+------------+------------+
>>> | boot_successes | 40 | 13
>>> |
>>> | boot_failures | 0 | 27
>>> |
>>> | INFO:task_blocked_for_more_than#seconds | 0 | 27
>>> |
>>> | RIP:native_safe_halt | 0 | 20
>>> |
>>> | RIP:native_write_msr_safe | 0 | 27
>>> |
>>> | Kernel_panic-not_syncing:hung_task:blocked_tasks | 0 | 27
>>> |
>>> | backtrace:__close_fd | 0 | 27
>>> |
>>> | backtrace:SyS_close | 0 | 27
>>> |
>>> | backtrace:cpu_startup_entry | 0 | 19
>>> |
>>> | backtrace:watchdog | 0 | 27
>>> |
>>> | RIP:__lock_acquire | 0 | 2
>>> |
>>> | backtrace:rpc_async_schedule | 0 | 2
>>> |
>>> | backtrace:lock_acquire | 0 | 1
>>> |
>>> | RIP:delay_tsc | 0 | 1
>>> |
>>> | backtrace:SYSC_epoll_wait | 0 | 1
>>> |
>>> | backtrace:SyS_epoll_wait | 0 | 1
>>> |
>>> | RIP:pvclock_clocksource_read | 0 | 1
>>> |
>>> | RIP:xs_reclassify_socket | 0 | 1
>>> |
>>> | backtrace:xs_tcp_setup_socket | 0 | 2
>>> |
>>> | RIP:insert_work | 0 | 1
>>> |
>>> +--------------------------------------------------+------------+------------+
>>
>> We recently found this patch cause NFS hang in 0day/LKP test system.
>> The NFS export can be mounted, but after a while all read/write to NFS
>> mount blocked. This influenced the 0day/LKP testing. Could you help us
>> to fix this?
>>
>> Best Regards,
>> Huang, Ying
>
>
> I need to officially submit this patch :
> http://www.spinics.net/lists/netdev/msg375777.html
Thanks a lot! The patch fixed our NFS hang.
Tested-by: Huang, Ying <ying.hu...@intel.com>
Is it possible to put the fixing patch near (preferably next) the patch
trigger regression? Otherwise a bigger range of patches will not be
bisectable.
Best Regards,
Huang, Ying
