[Bug 1542] New: Badness in as_completed_request at drivers/block/as-iosched.c:919

[Martin J. Bligh]

http://bugme.osdl.org/show_bug.cgi?id=1542

           Summary: Badness in as_completed_request at drivers/block/as-
                    iosched.c:919
    Kernel Version: 2.6.0-test9
            Status: NEW
          Severity: low
             Owner: axboe@xxxxxxx
         Submitter: office@xxxxxxxxxxxxxxx


Distribution: Debian  
Hardware Environment: x86 SMP in UMP mode 
Software Environment: Debian unstable (current) 
Problem Description: strange  
 
Steps to reproduce:  
In normal operation, dmesg gives this: 
 
Badness in as_completed_request at drivers/block/as-iosched.c:919 
Call Trace: 
 [<c01e19fe>] as_completed_request+0x1ae/0x1dc 
 [<c01db343>] elv_completed_request+0x13/0x18 
 [<c01dd352>] __blk_put_request+0x26/0x80 
 [<c01de15b>] end_that_request_last+0x3f/0x74 
 [<c883481e>] scsi_end_request+0x8e/0xbc [scsi_mod] 
 [<c8834b89>] scsi_io_completion+0x1cd/0x434 [scsi_mod] 
 [<c88cba48>] sd_rw_intr+0x84/0x2d0 [sd_mod] 
 [<c8830768>] scsi_done+0xc/0x5c [scsi_mod] 
 [<c8830a4c>] scsi_finish_command+0x7c/0xc4 [scsi_mod] 
 [<c8830892>] scsi_softirq+0xda/0x1f0 [scsi_mod] 
 [<c0120a43>] do_softirq+0x8b/0x90 
 [<c010cc39>] do_IRQ+0xf1/0x124 
 [<c010b6e4>] common_interrupt+0x18/0x20 
 
Badness in as_completed_request at drivers/block/as-iosched.c:919 
Call Trace: 
 [<c01e19fe>] as_completed_request+0x1ae/0x1dc 
 [<c01db343>] elv_completed_request+0x13/0x18 
 [<c01dd352>] __blk_put_request+0x26/0x80 
 [<c01de15b>] end_that_request_last+0x3f/0x74 
 [<c883481e>] scsi_end_request+0x8e/0xbc [scsi_mod] 
 [<c8834b89>] scsi_io_completion+0x1cd/0x434 [scsi_mod] 
 [<c023b95e>] arp_process+0xaa/0x510 
 [<c88cba48>] sd_rw_intr+0x84/0x2d0 [sd_mod] 
 [<c8830768>] scsi_done+0xc/0x5c [scsi_mod] 
 [<c8830a4c>] scsi_finish_command+0x7c/0xc4 [scsi_mod] 
 [<c8830892>] scsi_softirq+0xda/0x1f0 [scsi_mod] 
 [<c0120a43>] do_softirq+0x8b/0x90 
 [<c010cc39>] do_IRQ+0xf1/0x124 
 [<c010b6e4>] common_interrupt+0x18/0x20 
 
# lsmod 
Module                  Size  Used by 
[...] 
md5                     3968  1 
osst                   49304  0 
sd_mod                 15776  26 
ide_scsi               13952  0 
ide_mod               137260  1 ide_scsi 
unix                   26928  198 
cfbcopyarea             4096  0 
cfbimgblt               3456  0 
cfbfillrect             3968  0 
raid1                  14720  1 
raid5                  19584  3 
md                     45888  6 raid1,raid5 
xor                    15112  1 raid5 
ext3                  107688  4 
jbd                    56728  1 ext3 
aic7xxx               189416  26 
scsi_mod              110136  4 osst,sd_mod,ide_scsi,aic7xxx 
 
It does not appear to affect normal operations, however.  
 
Salut 
 
Mark


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