Bug 185444 - kernel dm: missing bdput
kernel dm: missing bdput
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Alasdair Kergon
Brian Brock
Depends On:
Blocks: 181409
  Show dependency treegraph
Reported: 2006-03-14 15:43 EST by Alasdair Kergon
Modified: 2007-11-30 17:07 EST (History)
2 users (show)

See Also:
Fixed In Version: RHSA-2006-0575
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2006-08-10 18:40:43 EDT
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Regression: ---
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Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Regression test for this bug (156 bytes, application/x-shellscript)
2006-03-20 10:36 EST, Jun'ichi NOMURA
no flags Details

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2006:0575 normal SHIPPED_LIVE Important: Updated kernel packages available for Red Hat Enterprise Linux 4 Update 4 2006-08-10 00:00:00 EDT

  None (edit)
Description Alasdair Kergon 2006-03-14 15:43:45 EST
From: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
If we hold a bdev inode for a suspended device
when freeing it, we must call bdput first.
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-Off-By: Alasdair G Kergon <agk@redhat.com>
Index: linux-2.6.16-rc1/drivers/md/dm.c
--- linux-2.6.16-rc1.orig/drivers/md/dm.c       2006-03-01 21:40:30.000000000 +0000
+++ linux-2.6.16-rc1/drivers/md/dm.c    2006-03-01 21:42:55.000000000 +0000
@@ -849,6 +849,10 @@ static struct mapped_device *alloc_dev(u
 static void free_dev(struct mapped_device *md)
+       if (md->suspended_bdev) {
+               thaw_bdev(md->suspended_bdev, NULL);
+               bdput(md->suspended_bdev);
+       }
Comment 3 Jun'ichi NOMURA 2006-03-20 10:36:22 EST
Created attachment 126349 [details]
Regression test for this bug

Regression test for this bug.

If the bug is fixed, you see 'PASS'.
Otherwise, the test never finishes and dmsetup will hang
with backtrace like below:

crash> bt 32540
PID: 32540  TASK: e00000017ca98000  CPU: 0   COMMAND: "dmsetup"
 #0 [BSP:e00000017ca992a8] context_switch at a000000100068500
 #1 [BSP:e00000017ca99188] schedule at a000000100586fc0
 #2 [BSP:e00000017ca99128] __down at a0000001005867f0
 #3 [BSP:e00000017ca990e8] freeze_bdev at a000000100123960
 #4 [BSP:e00000017ca99098] dm_suspend at a0000002003e0e40
 #5 [BSP:e00000017ca99048] dev_suspend at a0000002003ea760
 #6 [BSP:e00000017ca98fe0] ctl_ioctl at a0000002003eda60
 #7 [BSP:e00000017ca98f50] sys_ioctl at a00000010014f280
 #8 [BSP:e00000017ca98f50] ia64_ret_from_syscall at a00000010000f3e0
Comment 4 Jason Baron 2006-03-28 12:43:39 EST
committed in stream u4 build 34.9. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/
Comment 5 Jeff Burke 2006-03-30 11:06:48 EST
This testcase had been add to RHTS /kernel/filesystems/185444
Comment 9 Red Hat Bugzilla 2006-08-10 18:40:43 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


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