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Subject[Bug 1542] New: Badness in as_completed_request at drivers/block/as-iosched.c:919
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@suse.de
Submitter: office@produktivit.com


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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