Comment 7 for bug 1706132

Okay,

First I have failed the path without propagating transport layer error and xfs stayed up (nmi watchdog would eventually detect a lockup if pagecache was ever attempted to be flushed), i returned the path and failed it again, now with error propagation. The error was detected and all SCSI CDBs were failed, SCSI sensed errors and XFS called shutdown:

http://pastebin.ubuntu.com/25376025/

Aug 23 11:34:47 xfshang kernel: [ 1871.328044] blk_update_request: I/O error, dev sdb, sector 20481104
Aug 23 11:34:47 xfshang kernel: [ 1871.328051] XFS (sdb1): metadata I/O error: block 0x1387c50 ("xlog_iodone") error 5 numblks 64
Aug 23 11:34:47 xfshang kernel: [ 1871.328053] XFS (sdb1): xfs_do_force_shutdown(0x2) called from line 1197 of file /build/linux-lts-xenial-AsqcmJ/linux-lts-xenial-4.4.0/fs/xfs/xfs_log.c. Return address = 0xffffffffc025f698
Aug 23 11:34:47 xfshang kernel: [ 1871.328066] XFS (sdb1): Log I/O Error Detected. Shutting down filesystem
Aug 23 11:34:47 xfshang kernel: [ 1871.328067] XFS (sdb1): Please umount the filesystem and rectify the problem(s)
Aug 23 11:34:47 xfshang kernel: [ 1873.966241] buffer_io_error: 173396 callbacks suppressed

Aug 23 11:34:47 xfshang kernel: [ 1873.966244] Buffer I/O error on dev sdb1, logical block 102421, lost async page write
Aug 23 11:34:47 xfshang kernel: [ 1873.967411] Buffer I/O error on dev sdb1, logical block 102422, lost async page write
Aug 23 11:34:47 xfshang kernel: [ 1873.968599] Buffer I/O error on dev sdb1, logical block 102423, lost async page write
...
Aug 23 11:34:56 xfshang dhclient: DHCPREQUEST of 192.168.50.95 on internal to 192.168.48.1 port 67 (xid=0x87b4739)
Aug 23 11:34:56 xfshang dhclient: DHCPACK of 192.168.50.95 from 192.168.48.1
Aug 23 11:34:56 xfshang dhclient: bound to 192.168.50.95 -- renewal in 15 seconds.
Aug 23 11:35:01 xfshang kernel: [ 1887.284525] XFS (sdb1): xfs_log_force: error -5 returned.
Aug 23 11:35:01 xfshang kernel: [ 1887.548087] XFS (sdb1): Unmounting Filesystem
Aug 23 11:35:01 xfshang kernel: [ 1887.548100] XFS (sdb1): xfs_log_force: error -5 returned.
Aug 23 11:35:01 xfshang kernel: [ 1887.548145] XFS (sdb1): xfs_log_force: error -5 returned.
Aug 23 11:35:01 xfshang kernel: [ 1887.548438] sd 5:0:0:1: rejecting I/O to offline device
Aug 23 11:35:01 xfshang kernel: [ 1887.549424] blk_update_request: I/O error, dev sdb, sector 0

Then I removed xfs module and no leak was found. I consider this verified and good to go.

Thank you!

-Rafael