[Bug 210996] I/O errors on NFS reads during high load on server

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210996

--- Comment #1 from Matthew Macy <mmacy at nextbsd.org> ---
If I'm running poudriere on my desktop (i7-5930k) I'll frequently get I/O
errors when doing (an unrelated) installkernel to a laptop over wired ethernet.


root at planecrash:/home/mmacy/devel/fbg-merge # time make -j12 installkernel -s
--------------------------------------------------------------
>>> Installing kernel GENERIC
--------------------------------------------------------------
find: /mnt/storage/mmacy/devel/fbg-merge/sys/modules/netgraph/pred1:
Input/output error
make[2]: "/mnt/storage/mmacy/devel/fbg-merge/sys/conf/kern.pre.mk" line 196:
warning: "find /mnt/storage/mmacy/devel/fbg-merge/sys/ -name \*_if.m" returned
non-zero status

and then later on the install fails with:
===> ispfw/isp_1080 (install)
install: radeon_hainan_me_bin.ko.debug: Input/output error
--- _kmodinstall ---
*** [_kmodinstall] Error code 71

make[6]: stopped in
/mnt/storage/mmacy/devel/fbg-merge/sys/modules/drm2/radeonkmsfw/hainan_me
1 error

make[6]: stopped in
/mnt/storage/mmacy/devel/fbg-merge/sys/modules/drm2/radeonkmsfw/hainan_me
--- realinstall_subdir_drm2/radeonkmsfw/hainan_me ---
*** [realinstall_subdir_drm2/radeonkmsfw/hainan_me] Error code 2

make[5]: stopped in
/mnt/storage/mmacy/devel/fbg-merge/sys/modules/drm2/radeonkmsfw
A failure has been detected in another branch of the parallel make

make[6]: stopped in
/mnt/storage/mmacy/devel/fbg-merge/sys/modules/drm2/radeonkmsfw/hainan_rlc
A failure has been detected in another branch of the parallel make

At which time I saw the following on the console:

Jul 10 18:04:11 planecrash kernel: newnfs: server '10.0.1.20' error: fileid
changed. fsid 0:0: expected fileid 0x4, got 0x2. (BROKEN NFS SERVER OR
MIDDLEWARE)


This problem has existed for at least as long as I've been working on graphics.

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