This test seems flaky on riscv64:
https://ci.debian.net/packages/g/golang-github-go-git-go-git/testing/riscv64/71616922/#L2642
The error seems somewhat Go internal, so I wonder if maybe this bug
really is due to something external to this package.
/Simon
1385s === CONT TestChecksumMismatch
1385s fatal error: concurrent map writes
1385s
1385s goroutine 166 [running]:
1385s internal/runtime/maps.fatal({0x5e454b?, 0x5314e0?})
1385s /usr/lib/go-1.26/src/runtime/panic.go:1181 +0x26
1385s github.com/go-git/go-git-fixtures.(*Fixture).file(0x5dd19f?, {0x3f25f203c0, 0x32})
1385s /tmp/autopkgtest-lxc.0hsf0y8h/downtmp/autopkgtest_tmp/_build/src/github.com/go-git/go-git-fixtures/fixtures.go:257 +0xf6
1385s github.com/go-git/go-git-fixtures.(*Fixture).Packfile(0x39b0580)
1385s /tmp/autopkgtest-lxc.0hsf0y8h/downtmp/autopkgtest_tmp/_build/src/github.com/go-git/go-git-fixtures/fixtures.go:262 +0x58
1385s github.com/go-git/go-git/plumbing/format/packfile_test.TestMalformedPack(0x3f25f2cfc8)
1385s /tmp/autopkgtest-lxc.0hsf0y8h/downtmp/autopkgtest_tmp/_build/src/github.com/go-git/go-git/plumbing/format/packfile/parser_test.go:126 +0x2ec
1385s testing.tRunner(0x3f25f2cfc8, 0x348c140)
1385s /usr/lib/go-1.26/src/testing/testing.go:2036 +0xc4
1385s created by testing.(*T).Run in goroutine 1
1385s /usr/lib/go-1.26/src/testing/testing.go:2101 +0x38a
1385s FAIL github.com/go-git/go-git/plumbing/format/packfile 119.786s