Date: Mon, 2 Oct 2017 15:35:42 -0400 From: grarpamp <grarpamp@gmail.com> To: freebsd-fs@freebsd.org Subject: dd: vm_fault: pager read error Message-ID: <CAD2Ti28Thcgg60c24_3VgPZABAdVkAhsc0F=VOPiAMr0KJSiog@mail.gmail.com>
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11.0 release amd64 r306420
kern.geom.debugflags=0 (unmodified)
dd if=/dev/zero of=/dev/ada0s1 seek=2048 count=1 bs=1m
1+0 records in
1+0 records out
1048576 bytes transferred
reboot: Device not configured,
and for any other uncached access to the filesystem
in ada0s1a, note / is on s1a, dd is past that.
vnode_pager_generic_getpages_done: I/O read error 5
vm_fault: pager read error, pid 1 (init)
HW reset and all layout, filesystems, and data are fine.
Repeatable.
Also,
echo '<random_string>' | dd of=/dev/ada0s1 seek=2048 count=1 bs=1m conv=sync
does get written and is readable upon reboot,
dd if=/dev/ada0s1 skip=2048 count=1 bs=1m
<random_string>'
wherein that read does not trigger the fault.
All the offsets and sizes add up sequentially, no overlap,
the relavant portions are below, disk is <~= 250G,
gpart, fdisk, boot0cfg, bsdlabel all concur without error.
What am I overlooking, or is this kernel behaviour a bug?
=> 63 x ada0 MBR (XG)
63 1 - free - (512B)
64 8388608 ada0s1 freebsd [active] (4.0G)
8388672 109051904 ada0s2 freebsd (52G)
=> 0 8388608 ada0s1 BSD (4.0G)
0 4194304 ada0s1a freebsd-ufs (2.0G) /
4194304 4194304 - free - (2.0G)
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