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* BUG: KCSAN: data-race in __rpc_do_wake_up_task_on_wq / xprt_request_transmit
@ 2020-12-04 18:35 Naresh Kamboju
  0 siblings, 0 replies; only message in thread
From: Naresh Kamboju @ 2020-12-04 18:35 UTC (permalink / raw)
  To: kasan-dev, open list, Netdev, linux-nfs, lkft-triage, rcu
  Cc: Jakub Kicinski, David S. Miller, chuck.lever, bfields,
	anna.schumaker, trond.myklebust, Paul E. McKenney, Marco Elver,
	Peter Zijlstra, Ingo Molnar

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

-- 
Linaro LKFT
https://lkft.linaro.org

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2020-12-04 18:35 BUG: KCSAN: data-race in __rpc_do_wake_up_task_on_wq / xprt_request_transmit Naresh Kamboju

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