linux-ext4 - [Bug 118041] New: My tricky script involving zram and device mapper hangs on "mount"

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Date:	Wed, 11 May 2016 21:22:20 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 118041] New: My tricky script involving zram and device mapper
 hangs on "mount"

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@...nel-bugs.osdl.org
          Reporter: vi0oss@...il.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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