linux-ext4 - resize2fs hang at read function

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Date:   Wed, 7 Mar 2018 09:59:35 +0800
From:   rong zhao <zhaorbox@...il.com>
To:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: resize2fs hang at read function

Hi,

I met a problem on resize2fs ext4 filesystem.

# Environment
OS: Redhat 7.4 64bit, Kernel: 3.10.0-693.11.6.el7.x86_64

Storage: connected 3PAR storage with multipath, create LVM on LUNs
Filesystem: ext4

# Problem Description
1. create new filesystem, format ext4
2. I tried extend LVM, and resize2fs online, it worked indeed
3. I copied 27T data to the new filesystem
4. Then, I try to extend LVM and resize2fs online again, resize2fs
hang at read function, the strace records are below:
----there are more lines above, do not paste here -------
lseek(3, 38465727102976, SEEK_SET)      = 38465727102976
read(3, "\1\0\300/\21\0\300/!\0\300/_\177\200\0\0\0\5\0\0\0\0\0\0\0\0\0\200\0\330\326"...,
4096) = 4096
lseek(3, 38474317037568, SEEK_SET)      = 38474317037568
read(3, "\1\0\340/\21\0\340/!\0\340/_\177\200\0\0\0\5\0\0\0\0\0\0\0\0\0\200\0000\214"...,
4096) = 4096

--- hang here

5. the filesystem state is clean:
dumpe2fs /dev/billdb_new/billdb_new | grep state
dumpe2fs 1.42.9 (28-Dec-2013)
Filesystem state:         clean

6. e2fsck show the filesystem is healthy.

# Other Information
1. I had old filesystem with same issue, to solve this problem, I
requested new LUNs from storage and create new filesystem
2. Copy data from old filesystem to new filesystem
3. The old fiesystem and new filesyste can be read/written without problem

Please give me some suggestions, have googled long time..

Thanks.