I think 99% is an exaggeration for a lot of industries.
Recently I've been working in NodeJS - where it's incredibly likely that someone on the team has pulled in some dependency that someone hacked together without testing. So that's the first place I look.
Previously I've worked in the Enterprise .Net/Java space where most of the time any obscure bug is in some vendor software - for example in one form engine I remember where in several releases the underlying call to .Net's SMTP 'SendMail()' method was accidentally removed. If the license agreement hadn't forbidden decompilation I'd have been able to prove it to them in hours instead of weeks.
For higher quality open source software, such as GCC and the Linux Kernel 99% might not be far off. I for one have never found a bug in a mature open source project.
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I think 99% is an exaggeration for a lot of industries.
Recently I've been working in NodeJS - where it's incredibly likely that someone on the team has pulled in some dependency that someone hacked together without testing. So that's the first place I look.
Previously I've worked in the Enterprise .Net/Java space where most of the time any obscure bug is in some vendor software - for example in one form engine I remember where in several releases the underlying call to .Net's SMTP 'SendMail()' method was accidentally removed. If the license agreement hadn't forbidden decompilation I'd have been able to prove it to them in hours instead of weeks.
For higher quality open source software, such as GCC and the Linux Kernel 99% might not be far off. I for one have never found a bug in a mature open source project.