[xfs-masters] [Bug 916] New: xfs_log_force blocked

[bugzilla-daemon at oss.sgi.com]

http://oss.sgi.com/bugzilla/show_bug.cgi?id=916

           Summary: xfs_log_force blocked
           Product: XFS
           Version: unspecified
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: XFS kernel code
        AssignedTo: xfs-masters at oss.sgi.com
        ReportedBy: amethyst623 at 163.com
   Estimated Hours: 0.0
    Classification: Unclassified


xfs filesystem from linux kernel 2.6.32.16.

one of our application does the recording work. 
each time, it writes 128K data to USB hard disk(xfs format) using fwrite. 
while recording, the USB HDD is unpluged suddenly.
usually, fwrite returns immediately, but sometimes, fwrite function returns
after 3-10 seconds. we don't know why?


[ 2232.815000] lost page write due to I/O error on sdb1
[ 2232.817000] Buffer I/O error on device sdb1, logical block 305866
[ 2232.821000] lost page write due to I/O error on sdb1
[ 2232.823000] Buffer I/O error on device sdb1, logical block 305867
[ 2232.828000] lost page write due to I/O error on sdb1
[ 2232.832000] Buffer I/O error on device sdb1, logical block 305868
[ 2232.834000] lost page write due to I/O error on sdb1------->blocked here

[ 2242.030000] Filesystem "sda1": xfs_log_force: error 5 returned.
[ 2249.582000] end_request: I/O error, dev sdb, sector 488596419
[ 2249.583000] I/O error in filesystem ("sdb1") meta-data dev sdb1 block
0x1d1f6384       ("xlog_iodone") error 5 buf count 4096
[ 2249.584000] xfs_force_shutdown(sdb1,0x2) called from line 1043 of file
fs/xfs/xfs_log.c.  Return address = 0xc161c228 


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