[Bug 216343] XFS: no space left in xlog cause system hang

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216343

--- Comment #5 from zhoukete@126.com ---
(In reply to Amir Goldstein from comment #4)

> 
> According to xfs_trans_dirty_buf() I think it could mean uptodate and
> dirty buffer.
> 

when I review the xfs_trans_dirty_buf code, I found that xfs inode item
b_log_item is null,

crash> xfs_log_item.li_buf,li_ops 0xffff0340999a0a80 -x
  li_buf = 0xffff0200125b7180
  li_ops = 0xffff800008faec60 <xfs_inode_item_ops> 
crash> xfs_buf.b_log_item 0xffff0200125b7180
  b_log_item = 0x0

and only xfs buf log item b_log_item has value

crash> xfs_log_item.li_buf,li_ops ffff033f8d7c9de8 -x
  li_buf = 0x0
  li_ops = 0xffff800008fae8d8 <xfs_buf_item_ops> 
crash> xfs_buf_log_item.bli_buf  ffff033f8d7c9de8
  bli_buf = 0xffff0200125b4a80
crash> xfs_buf.b_log_item 0xffff0200125b4a80
  b_log_item = 0xffff033f8d7c9de8
crash> xfs_buf_log_item.bli_flags 0xffff033f8d7c9de8
  bli_flags = 2     (XFS_BLI_DIRTY)
crash> xfs_buf_log_item.bli_item.li_flags  ffff033f8d7c9de8
  bli_item.li_flags = 1,  (XFS_LI_IN_AIL)

So xfs buf log item XFS_DONE is set because of xfs_trans_dirty_buf(),buf xfs
inode log item never call xfs_trans_dirty_buf() because of b_log_item == 0x0.

Do  you know the reason why xfs inode log item XFS_DONE is set？

> 
> Maybe the hardware never returned with a response?
> Hard to say. Maybe someone else has ideas.
> 

If we can prove that XFS_DONE isn't stand for iodone, I think this issue may
cause by the hardware error.

I find the err msg in dmesg:
[ 9824.111366] mpt3sas_cm0: issue target reset: handle = (0x0034)  

Maybe it tell us mpt3sas lost the io requests before.

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