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Buffer I/O error and print_req_error

Posted: 2020/05/02 10:04:56
by AleksandrKhviasko
Good afternoon.
I have Centos 8 Minimal installed on a hyper-v virtual machine. I get errors below. Help me please. What should I do?

12:29 Buffer I/O error on dev sr0, logical block 1, async page read kernel
12:29 Buffer I/O error on dev sr0, logical block 0, async page read kernel
12:29 print_req_error: I/O error, dev sr0, sector 0 flags 0 kernel
12:29 Buffer I/O error on dev sr0, logical block 7, async page read kernel
12:29 print_req_error: I/O error, dev sr0, sector 7 flags 0 kernel
12:29 Buffer I/O error on dev sr0, logical block 6, async page read kernel
12:29 print_req_error: I/O error, dev sr0, sector 6 flags 0 kernel
12:29 Buffer I/O error on dev sr0, logical block 5, async page read kernel
12:29 print_req_error: I/O error, dev sr0, sector 5 flags 0 kernel
12:29 Buffer I/O error on dev sr0, logical block 4, async page read kernel
12:29 print_req_error: I/O error, dev sr0, sector 4 flags 0 kernel
12:29 Buffer I/O error on dev sr0, logical block 3, async page read kernel
12:29 print_req_error: I/O error, dev sr0, sector 3 flags 0 kernel
12:29 Buffer I/O error on dev sr0, logical block 2, async page read kernel
12:29 print_req_error: I/O error, dev sr0, sector 2 flags 0 kernel
12:29 Buffer I/O error on dev sr0, logical block 1, async page read kernel
12:29 print_req_error: I/O error, dev sr0, sector 1 flags 0 kernel
12:29 Buffer I/O error on dev sr0, logical block 0, async page read kernel
12:29 print_req_error: I/O error, dev sr0, sector 0 flags 0 kernel

Re: Buffer I/O error and print_req_error

Posted: 2020/05/02 10:09:24
by TrevorH
It's telling you that it's unable to read whatever is in the "CD/DVD" drive on that VM. You should verify if the iso image or physical device that is attached to it is functioning correctly.

Re: Buffer I/O error and print_req_error

Posted: 2020/05/02 10:37:17
by AleksandrKhviasko
But I don’t have anything in the “CD / DVD”. I have now deleted the "CD / DVD" from the virtual machine. Errors have stopped yet

Re: Buffer I/O error and print_req_error

Posted: 2020/05/02 12:41:18
by TrevorH
Well /dev/sr0 is your virtual optical drive inside the VM. It's trying to access it and getting errors so it presumably thinks there is media in it and that it's corrupt.