From: bugzilla-daemon@bugzilla.kernel.org
To: linux-ext4@vger.kernel.org
Subject: [Bug 118041] New: My tricky script involving zram and device mapper hangs on "mount"
Date: Wed, 11 May 2016 21:22:20 +0000 [thread overview]
Message-ID: <bug-118041-13602@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=118041
Bug ID: 118041
Summary: My tricky script involving zram and device mapper
hangs on "mount"
Product: File System
Version: 2.5
Kernel Version: 4.4.8-grsec,4.1.9
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: fs_ext4@kernel-bugs.osdl.org
Reporter: vi0oss@gmail.com
Regression: No
As far as I remember, I have implemented and used the script on 3.8.3 (or
3.7.5?) successfully. But after upgrading to other kernel version it broke: now
"mount" hangs (in uninterruptible sleep), consuming 100% CPU and eating all
memory.
The script:
---
modprobe zram num_devices=2
sleep 1
echo 1500M > /sys/block/zram0/disksize
echo 100M > /sys/block/zram1/disksize
MS=$(blockdev --getsize /dev/zram0)
WS=$(blockdev --getsize /dev/zram1)
DS=$(blockdev --getsize /dev/mapper/cryptie4-ff)
MN=$(printf '%d:%d' `stat -Lc '0x%t 0x%T' /dev/zram0`)
WN=$(printf '%d:%d' `stat -Lc '0x%t 0x%T' /dev/zram1`)
DN=$(printf '%d:%d' `stat -Lc '0x%t 0x%T' /dev/mapper/cryptie4-ff`)
pv /dev/mapper/cryptie4-ff | hashed_update /dev/stdin NULL /dev/zram0
/tmp/ff.md5 65536
dmsetup create ff --table "0 $MS snapshot-origin $MN"
# /dev/mapper/ff /mnt/ff ext4 noatime,noauto 0 0
mount /mnt/ff
# after this command ff_snap should begin working
dmsetup create ff_disk --table "0 $DS snapshot-origin $DN"
---
So far I have just abandoned the script and hasn't experimented more. Shall I
try to isolate and maybe bisect the problem?
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next reply other threads:[~2016-05-11 21:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-11 21:22 bugzilla-daemon [this message]
2016-05-17 16:27 ` [Bug 118041] My tricky script involving zram and device mapper hangs on "mount" bugzilla-daemon
2016-05-17 16:48 ` bugzilla-daemon
2016-05-17 17:55 ` bugzilla-daemon
2016-05-17 18:59 ` bugzilla-daemon
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