BUG: KCSAN: data-race in __rpc_do_wake_up_task_on_wq / xprt_request_transmit

[Naresh Kamboju]

LKFT started testing KCSAN enabled kernel from the linux next tree.
Here we have found BUG: KCSAN: data-race in
__rpc_do_wake_up_task_on_wq / xprt_request_transmit

This report is from an x86_64 machine clang-11 linux next 20201201.
Since we are running for the first time we do not call this regression.

[   17.316725] BUG: KCSAN: data-race in __rpc_do_wake_up_task_on_wq /
xprt_request_transmit
[   17.324821]
[   17.326322] write to 0xffff90a801de6a9c of 2 bytes by task 142 on cpu 1:
[   17.333022]  __rpc_do_wake_up_task_on_wq+0x295/0x350
[   17.337987]  rpc_wake_up_queued_task+0x99/0xc0
[   17.342432]  xprt_complete_rqst+0xef/0x100
[   17.346533]  xs_read_stream+0x9c6/0xc40
[   17.350370]  xs_stream_data_receive+0x60/0x130
[   17.354819]  xs_stream_data_receive_workfn+0x5c/0x90
[   17.359784]  process_one_work+0x4a6/0x830
[   17.363795]  worker_thread+0x5f7/0xaa0
[   17.367548]  kthread+0x20b/0x220
[   17.370780]  ret_from_fork+0x22/0x30
[   17.374359]
[   17.375858] read to 0xffff90a801de6a9c of 2 bytes by task 249 on cpu 3:
[   17.382473]  xprt_request_transmit+0x389/0x7a0
[   17.386919]  xprt_transmit+0xfe/0x250
[   17.390583]  call_transmit+0x10d/0x120
[   17.394337]  __rpc_execute+0x12d/0x700
[   17.398089]  rpc_async_schedule+0x59/0x90
[   17.402100]  process_one_work+0x4a6/0x830
[   17.406114]  worker_thread+0x5f7/0xaa0
[   17.409868]  kthread+0x20b/0x220
[   17.413099]  ret_from_fork+0x22/0x30
[   17.416675]
[   17.418167] Reported by Kernel Concurrency Sanitizer on:
[   17.423475] CPU: 3 PID: 249 Comm: kworker/u8:1 Not tainted
5.10.0-rc6-next-20201201 #2
[   17.431385] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.2 05/23/2018
[   17.438778] Workqueue: rpciod rpc_async_schedule

metadata:
    git_repo: https://gitlab.com/aroxell/lkft-linux-next
    target_arch: x86
    toolchain: clang-11
    git_describe: next-20201201
    download_url: https://builds.tuxbuild.com/1l8eiWgGMi6W4aDobjAAlOleFVl/

Full test log link,
https://lkft.validation.linaro.org/scheduler/job/2002643#L1005

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Linaro LKFT
https://lkft.linaro.org