df hanging: Buffer I/O error on dev sdh1, logical block 754166359, async page read

After a Ubuntu 20.04 machine has been running for some time, and I tried to run df, it simply just hangs there.

dmesg shows tons of the same error message:

[118924.226495] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118924.226928] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118924.227149] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118924.227344] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118924.227500] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118924.227701] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118924.227906] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118924.228065] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118924.228354] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118924.228517] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118929.496105] buffer_io_error: 1440 callbacks suppressed
[118929.496110] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118929.496422] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118929.496605] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118929.496780] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118929.496964] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118929.497150] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118929.497296] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118929.497445] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118929.497625] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118929.497855] Buffer I/O error on dev sdh1, logical block 754166359, async page read
[118934.783290] buffer_io_error: 1440 callbacks suppressed

How should we proceed next?

Can we unmount /dev/sdh1, then remount it, in order for us to run df properly again? If so, how do we find the mount point for /dev/sdh1, so that we can run the command sudo umount <mountpoint_of_/dev/sdh1>?

Tried the following commands but they return nothing

• findmnt -S /dev/sdh
• findmnt -S /dev/sdh1
• grep /dev/sdh /etc/mtab
• grep /dev/sdh1 /etc/mtab

4

1 Answer

You do not need to know the mount point in order to unmount it, the device name is enough. Just do sudo umount /dev/sdh1.

If you want to identify the mount point, findmnt /dev/sdh1 should be enough.

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