clang-9 scan-build results up to dbfec5cc09cedfe3a31fc958a80e111f50716929

[gdevenyi]

System information

Type	Version/Name
Distribution Name	Ubuntu
Distribution Version	18.04
Linux Kernel	5.4.14-xanmod1
Architecture	x86_x64
ZFS Version	master dbfec5c
SPL Version	NA

Describe the problem you're observing

scan-build with clang-9 reports possible bugs with static analysis. I've taken note of #1721 that are likely many false-positives due to the way kernel code works. I tried to find more detail on the current state of scan-build on the kernel but my google-fu was unable to find any tweaks to suppress or otherwise improve the false-positive rate. The analysis may be incomplete as scan-build/clang crashes on some files during analysis.

Describe how to reproduce the problem

> git clone git@github.com:zfsonlinux/zfs.git
> sh autogen.sh
> scan-build-9 ./configure
> scan-build-9  -analyze-headers -maxloop 100 --keep-going  make -j$(nproc) 1> >(tee stdout.txt ) 2> >(tee stderr.txt >&2 )

Include any warning/errors/backtraces from the system logs

stderr.txt

[gdevenyi]

The html is too large for github upload: https://we.tl/t-S0MIBm599a