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syscall: TestDirentRepeat broken on FreeBSD 11.2 #31403

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bradfitz opened this issue Apr 11, 2019 · 3 comments
Closed

syscall: TestDirentRepeat broken on FreeBSD 11.2 #31403

bradfitz opened this issue Apr 11, 2019 · 3 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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@bradfitz
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https://go-review.googlesource.com/c/go/+/171477 broke:

https://build.golang.org/log/659cce8aef83ace25901509984f0d41e0bf1833b

--- FAIL: TestDirentRepeat (0.00s)
    dirent_bsd_test.go:131: bad file list: want
        ["file0" "file1" "file10" "file11" "file12" "file13" "file14" "file15" "file16" "file17" "file18" "file19" "file2" "file20" "file21" "file22" "file23" "file24" "file25" "file26" "file27" "file28" "file29" "file3" "file30" "file31" "file32" "file33" "file34" "file35" "file36" "file37" "file38" "file39" "file4" "file40" "file41" "file42" "file43" "file44" "file45" "file46" "file47" "file48" "file49" "file5" "file50" "file51" "file52" "file53" "file54" "file55" "file56" "file57" "file58" "file59" "file6" "file60" "file61" "file62" "file63" "file64" "file65" "file66" "file67" "file68" "file69" "file7" "file70" "file71" "file72" "file73" "file74" "file75" "file76" "file77" "file78" "file79" "file8" "file80" "file81" "file82" "file83" "file84" "file85" "file86" "file87" "file88" "file89" "file9" "file90" "file91" "file92" "file93" "file94" "file95" "file96" "file97" "file98" "file99"]
        got
        ["file0" "file1" "file10" "file11" "file12" "file13" "file14" "file15" "file2" "file3" "file4" "file5" "file6" "file62" "file63" "file64" "file65" "file66" "file67" "file68" "file69" "file7" "file70" "file71" "file72" "file73" "file74" "file75" "file76" "file77" "file78" "file79" "file8" "file9"]
FAIL
FAIL	syscall	0.058s
@bradfitz bradfitz added the NeedsFix The path to resolution is known, but the work has not been done. label Apr 11, 2019
@bradfitz bradfitz added this to the Go1.13 milestone Apr 11, 2019
@eliasnaur
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I believe both netbsd also broke by the same change, in a different way:

https://build.golang.org/log/08ee3b794c5871f4778b426526f5072f3083bed7

@paulzhol
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// Note: the buf is small enough that this loop will need to
// execute multiple times. See issue #31368.
buf := make([]byte, N*unsafe.Offsetof(syscall.Dirent{}.Name)/4)
n, err := syscall.ReadDirent(fd, buf)

On FreeBSD 11.x syscall.Dirent is not the type stored/read. It is converted from syscall.dirent_freebsd11 , also the minimum buffer size to read dirents into is 1024 bytes (DIRBLKSIZ).

type Dirent struct {
Fileno uint64
Off int64
Reclen uint16
Type uint8
Pad0 uint8
Namlen uint16
Pad1 uint16
Name [256]int8
}
type dirent_freebsd11 struct {
Fileno uint32
Reclen uint16
Type uint8
Namlen uint8
Name [256]int8
}

The convertion is done in Getdirentries:

func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
if supportsABI(_ino64First) {
return getdirentries_freebsd12(fd, buf, basep)
}
// The old syscall entries are smaller than the new. Use 1/4 of the original
// buffer size rounded up to DIRBLKSIZ (see /usr/src/lib/libc/sys/getdirentries.c).
oldBufLen := roundup(len(buf)/4, _dirblksiz)
oldBuf := make([]byte, oldBufLen)
n, err = getdirentries(fd, oldBuf, basep)
if err == nil && n > 0 {
n = convertFromDirents11(buf, oldBuf[:n])
}
return
}

@gopherbot
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Change https://golang.org/cl/171757 mentions this issue: syscall: enforce minimum buffer size to call ReadDirent

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