Re: [Crash-utility] [PATCH] kernel: fix start-up time degradation caused by strings command

verify_namelist() uses strings command and scans full part of vmlinux file to find linux_banner string. However, vmlinux file is quite large these days, reaching over 500MB. As a result, this degradates start-up time of crash command 10 or more seconds. (Of course, this depends on machines you use for investigation, but I guess typically we cannot use such powerful machines to investigate crash dump...) To resolve this issue, let's use bfd library and read linux_banner string in vmlinux file directly. A simple benchmark shows the following result: Without the fix: # cat ./commands.txt quit # time ./crash -i ./commands.txt \ /usr/lib/debug/lib/modules/5.16.15-201.fc35.x86_64/vmlinux \ /var/crash/*/vmcore >/dev/null 2>&1 real 0m20.251s user 0m19.022s sys 0m1.054s With the fix: # time ./crash -i ./commands.txt \ /usr/lib/debug/lib/modules/5.16.15-201.fc35.x86_64/vmlinux \ /var/crash/*/vmcore >/dev/null 2>&1 real 0m6.528s user 0m6.143s sys 0m0.431s Note that this commit keeps the original logic that uses strings command for backward compatibility for in case.