回复:system hang on a syncfs test with nfs_export enabled

[Chengguang Xu <cgxu519@mykernel.net>]

 ---- 在 星期四, 2020-04-30 17:15:20 Chengguang Xu <cgxu519@mykernel.net> 撰写 ----
 > Hi 
 > 
 > I'm doing some tests for my new version of syncfs improvement patch and I found an 
 > interesting problem​ when combining dirty data && godown && nfs_export.
 > 
 > My expectation  is  Pass or Fail  all tests listed below, Test2 looks a bit strange and in my
 > opinion there is no strong connection between nfs_export/index and dirty data.
 > Any idea?
 > 
 > 
 > Test env and step like below:
 > 
 > Test1:
 > Compile module with nfs_export enabled
 > Run xfstest generic/474   ==> PASS
 > 
 > Test2:
 > Compile module with nfs_export enabled
 > Comment syncfs step in the test
 > Run xfstest generic/474   ==> Hang
 > 
 > Test3:
 > Compile module with nfs_export disabled
 > Run xfstest generic/474   ==> PASS
 > 
 > Test4:
 > Compile module with nfs_export disabled
 > Comment syncfs step in the test
 > Run xfstest generic/474   ==> FAIL
 > 

Additional information:

Overlayfs version: latest next branch of miklos tree (5.7-rc2)
Underlying fs: xfs

Thanks,
cgxu