cmd/link/internal/ld: TestFallocate consistently failing on freebsd-riscv64-unmatched #59352

bcmills · 2023-03-31T19:59:54Z

https://build.golang.org/log/81f8a8d0ec2511d322c9e2f8d9ad3b170fc33866:

--- FAIL: TestFallocate (0.00s)
    fallocate_test.go:60: unexpected disk usage: got 1 blocks, want at least 2048
    fallocate_test.go:60: unexpected disk usage: got 1 blocks, want at least 4096
    fallocate_test.go:60: unexpected disk usage: got 1 blocks, want at least 6144
FAIL
FAIL	cmd/link/internal/ld	45.438s

Looks like the same failure mode as #42005, but I'm filing a separate issue because this may be resolved on this particular builder by either reconfiguring the builder or adding a test skip.

(attn @mengzhuo; CC @golang/freebsd)

The text was updated successfully, but these errors were encountered:

cherrymui · 2023-03-31T21:52:29Z

Fallocate is newly enabled on FreeBSD at CL https://golang.org/cl/478035 . cc @tklauser

paulzhol · 2023-04-01T18:05:23Z

ZFS on FreeBSD does not support posix_fallocate. The syscall should return EINVAL according to man posix_fallocate(2):

... or the operation is not supported by the file system.

The reason for removal of posix_allocate is also explained here: https://svnweb.freebsd.org/base?view=revision&revision=325320.

All the other builders use UFS2 AFIK, if freebsd-riscv64-unmatched is indeed using ZFS, then we're not handling the error properly.
The test checks for syscall.EOPNOTSUPP:
https://github.com/golang/go/blob/master/src/cmd/link/internal/ld/fallocate_test.go#L29-L31

Maybe we should test for errNoFallocate instead, like the one outbuf_nofallocate.go is returning (plus an explicit EINVAL check in outbuf_freebsd.go converting it to errNoFallocate)?

paulzhol · 2023-04-01T21:11:46Z

I'm also seeing it on my builder which was down for a week. It is a slightly different failure mode (the filesystem is UFS1 in my case):

--- FAIL: TestFallocate (0.00s)
    fallocate_test.go:60: unexpected disk usage: got 128 blocks, want at least 2048
    fallocate_test.go:60: unexpected disk usage: got 192 blocks, want at least 4096
    fallocate_test.go:60: unexpected disk usage: got 256 blocks, want at least 6144
FAIL
FAIL	cmd/link/internal/ld	45.338s
FAIL

bcmills · 2023-04-03T13:43:36Z

The syscall should return EINVAL

That's unfortunate, but common enough that testenv.SyscallIsNotSupported checks for it explicitly:
https://cs.opensource.google/go/go/+/master:src/internal/testenv/testenv_unix.go;l=31-34;drc=75c2e97c3c11050847fc221480e1939f29c911e5

So probably the test could use that if the system call actually returned EINVAL as documented.

Unfortunately, the failure mode we're seeing here is not consistent with an error return from the syscall. There is an explicit error check before the unexpected disk usage check:

go/src/cmd/link/internal/ld/fallocate_test.go

Lines 35 to 37 in 8edcddd

    
           if err != nil { 
        
           	t.Fatalf("fallocate failed: %v", err) 
        
           }

bcmills · 2023-04-03T14:08:35Z

I think this is a platform-independent bug in the test (CC @golang/runtime). The size being passed to fallocate is only 1 KiB:

go/src/cmd/link/internal/ld/fallocate_test.go

Line 28 in 8edcddd

err = out.fallocate(1 << 10)

Then the sizes passed to mmap are 1–3 MiB and the test is assuming that the number of reserved blocks is increased accordingly:

go/src/cmd/link/internal/ld/fallocate_test.go

Line 43 in 8edcddd

for _, sz := range []int64{1 << 20, 2 << 20, 3 << 20} {

go/src/cmd/link/internal/ld/fallocate_test.go

Line 59 in 8edcddd

if got, want := stat.Sys().(*syscall.Stat_t).Blocks, (sz+511)/512; got < want {

But without subsequent calls to fallocate, it's not at all clear to me why we should expect the filesystem to have allocated more blocks after the mmap, if the filesystem may use copy-on-write blocks.

cherrymui · 2023-04-03T16:08:55Z

out.Mmap does fallocate https://cs.opensource.google/go/go/+/master:src/cmd/link/internal/ld/outbuf_mmap.go;l=23
(out.Mmap is not just a plain syscall)

bcmills · 2023-04-03T16:16:51Z

Hmm, looks like (*OutBuf).Mmap is missing casses for EOPNOTSUPP and EINVAL, at least. 🤔
https://cs.opensource.google/go/go/+/master:src/cmd/link/internal/ld/outbuf_mmap.go;l=31;drc=058f019e45fc1f18842e0339d7d56d804936263b

But that still wouldn't produce the observed failure mode in the test.

cherrymui · 2023-04-03T16:30:44Z

Last time I looked, on all relevant platforms ENOTSUP and EOPNOTSUPP are equal. But I guess it doesn't hurt to include both. EINVAL is arguably weird -- I'd hope it fails if we actually pass a wrong argument to fallocate. But given this issue, maybe it is fine. (Why FreeBSD/ZFS doesn't return ENOTSUP or EOPNOTSUPP? ...)

paulzhol · 2023-04-03T21:06:58Z

Attached the truss syscall trace from a tmpfs flesystem as used on the main FreeBSD 13.1 amd64/i386 builders:

70343: 0.007439040 posix_fallocate(0x3,0x0,0x400) = 0 (0x0)
70343: 0.007685140 nanosleep({ 0.000020000 })    = 0 (0x0)
70343: 0.007693940 posix_fallocate(0x3,0x0,0x100000) = 0 (0x0)
70343: 0.007722300 ftruncate(3,0x100000)         = 0 (0x0)
70343: 0.007755530 nanosleep({ 0.000020000 })    = 0 (0x0)
70343: 0.007763790 mmap(0x0,1048576,PROT_READ|PROT_WRITE,MAP_SHARED,3,0x0) = 35785814016 (0x855003000)
70343: 0.007798940 fstatat(AT_FDCWD,"/tmp/TestFallocate3468667880/001/a.out",{ mode=-rwxr-xr-x ,inode=36604,size=1048576,blksize=4096 },0x0) = 0 (0x0)
70343: 0.007809760 nanosleep({ 0.000020000 })    = 0 (0x0)
70343: 0.007844200 munmap(0x855003000,1048576)   = 0 (0x0)
70343: 0.007852720 nanosleep({ 0.000020000 })    = 0 (0x0)
70343: 0.008228670 nanosleep({ 0.000020000 })    = 0 (0x0)
70343: 0.008237430 posix_fallocate(0x3,0x0,0x200000) = 0 (0x0)
70343: 0.008264920 ftruncate(3,0x200000)         = 0 (0x0)
70343: 0.008292320 nanosleep({ 0.000020000 })    = 0 (0x0)
70343: 0.008300700 mmap(0x0,2097152,PROT_READ|PROT_WRITE,MAP_SHARED,3,0x0) = 35762733056 (0x853a00000)
70343: 0.008330000 fstatat(AT_FDCWD,"/tmp/TestFallocate3468667880/001/a.out",{ mode=-rwxr-xr-x ,inode=36604,size=2097152,blksize=4096 },0x0) = 0 (0x0)
70343: 0.008355660 nanosleep({ 0.000020000 })    = 0 (0x0)
70343: 0.008363740 munmap(0x853a00000,2097152)   = 0 (0x0)
70343: 0.008897930 nanosleep({ 0.000020000 })    = 0 (0x0)
70343: 0.008906620 posix_fallocate(0x3,0x0,0x300000) = 0 (0x0)
70343: 0.008933030 ftruncate(3,0x300000)         = 0 (0x0)
70343: 0.008959760 nanosleep({ 0.000020000 })    = 0 (0x0)
70343: 0.008968280 mmap(0x0,3145728,PROT_READ|PROT_WRITE,MAP_SHARED,3,0x0) = 35762733056 (0x853a00000)
70343: 0.008999030 fstatat(AT_FDCWD,"/tmp/TestFallocate3468667880/001/a.out",{ mode=-rwxr-xr-x ,inode=36604,size=3145728,blksize=4096 },0x0) = 0 (0x0)
70343: 0.009024660 nanosleep({ 0.000020000 })    = 0 (0x0)
70343: 0.009033260 munmap(0x853a00000,3145728)   = 0 (0x0)

A ZFS directory with lz4 compression enabled reproduces the test failure with a single block:

=== RUN   TestFallocate
    fallocate_test.go:60: unexpected disk usage: got 1 blocks, want at least 2048
    fallocate_test.go:60: unexpected disk usage: got 1 blocks, want at least 4096
    fallocate_test.go:60: unexpected disk usage: got 1 blocks, want at least 6144
--- FAIL: TestFallocate (0.00s)
FAIL

truss log (posix_fallocate returning EINVAL but ignored?):

75784: 0.007915430 posix_fallocate(0x3,0x0,0x400) ERR#22 'Invalid argument'
75784: 0.007961290 posix_fallocate(0x3,0x0,0x100000) ERR#22 'Invalid argument'
75784: 0.007987920 nanosleep({ 0.000020000 })    = 0 (0x0)
75784: 0.007995870 ftruncate(3,0x100000)         = 0 (0x0)
75784: 0.008030060 mmap(0x0,1048576,PROT_READ|PROT_WRITE,MAP_SHARED,3,0x0) = 35807641600 (0x8564d4000)
75784: 0.008040770 nanosleep({ 0.000020000 })    = 0 (0x0)
75784: 0.008076570 fstatat(AT_FDCWD,"/home/yuval/Data/tmp/TestFallocate863409915/001/a.out",{ mode=-rwxr-xr-x ,inode=721019,size=1048576,blksize
=1048576 },0x0) = 0 (0x0)
75784: 0.008088000 nanosleep({ 0.000020000 })    = 0 (0x0)
75784: 0.008141090 nanosleep({ 0.000020000 })    = 0 (0x0)
75784: 0.008149300 write(1,"    fallocate_test.go:60: unexpe"...,82) = 82 (0x52)
75784: 0.008177910 munmap(0x8564d4000,1048576)   = 0 (0x0)
75784: 0.008196210 posix_fallocate(0x3,0x0,0x200000) ERR#22 'Invalid argument'
75784: 0.008205620 nanosleep({ 0.000020000 })    = 0 (0x0)
75784: 0.008235760 ftruncate(3,0x200000)         = 0 (0x0)
75784: 0.008256360 mmap(0x0,2097152,PROT_READ|PROT_WRITE,MAP_SHARED,3,0x0) = 35796287488 (0x855a00000)
75784: 0.008266100 nanosleep({ 0.000020000 })    = 0 (0x0)
75784: 0.008302200 fstatat(AT_FDCWD,"/home/yuval/Data/tmp/TestFallocate863409915/001/a.out",{ mode=-rwxr-xr-x ,inode=721019,size=2097152,blksize
=1048576 },0x0) = 0 (0x0)
75784: 0.008331090 nanosleep({ 0.000020000 })    = 0 (0x0)
75784: 0.008339130 write(1,"    fallocate_test.go:60: unexpe"...,82) = 82 (0x52)
75784: 0.008366400 munmap(0x855a00000,2097152)   = 0 (0x0)
75784: 0.008382670 posix_fallocate(0x3,0x0,0x300000) ERR#22 'Invalid argument'
75784: 0.008402730 ftruncate(3,0x300000)         = 0 (0x0)
75784: 0.008411540 nanosleep({ 0.000040000 })    = 0 (0x0)
75784: 0.008440800 mmap(0x0,3145728,PROT_READ|PROT_WRITE,MAP_SHARED,3,0x0) = 35815161856 (0x856c00000)
75784: 0.008461170 fstatat(AT_FDCWD,"/home/yuval/Data/tmp/TestFallocate863409915/001/a.out",{ mode=-rwxr-xr-x ,inode=721019,size=3145728,blksize=1048576 },0x0) = 0 (0x0)
75784: 0.008487470 write(1,"    fallocate_test.go:60: unexpe"...,82) = 82 (0x52)
75784: 0.008504550 munmap(0x856c00000,3145728)   = 0 (0x0)

paulzhol · 2023-04-03T21:10:57Z

I don't see any calls to msync, so I think this works on a tmpfs filesystem just by coincidence as a MAP_SHARED file-backed tmpfs is actually anonymous memory.

bcmills · 2023-04-03T21:29:27Z

@paulzhol, is it possible that internal/syscall/unix.PosixFallocate is using the wrong syscall ABI for the error return? Otherwise, I don't see how it's possible for the ERR#22 from posix_fallocate to be ignored.

(The initial call to posix_fallocate with argument 0x400 is the direct call to out.fallocate within TestFallocate, and its return value is checked explicitly.)

paulzhol · 2023-04-03T22:25:43Z

@bcmills internal/syscall/unix.PosixFallocate looks fine to me. But weirdly enough, truss output from the arm builder also returns EINVAL for posix_allocate on a UFS1 filesystem which has fallocate:

2730: 0.072921729 posix_fallocate(0x3,0x0,0x0,0x400,0x0,0x0) ERR#22 'Invalid argument'
 2730: 0.073163969 posix_fallocate(0x3,0x0,0x0,0x100000,0x0,0x0) ERR#22 'Invalid argument'
 2730: 0.073726784 ftruncate(3,0x10000000000000) = 0 (0x0)
 2730: 0.075205955 mmap(0x0,1048576,PROT_READ|PROT_WRITE,MAP_SHARED,3,0x0) = 682622976 (0x28b00000)
 2730: 0.076058405 fstatat(AT_FDCWD,"/tmp/TestFallocate3866123553/001/a.out",{ mode=-rwxr-xr-x ,inode=36238,size=1048576,blksize=32768 },0x0) = 
0 (0x0)
 2730: 0.076769501 write(1,"    fallocate_test.go:60: unexpe"...,84) = 84 (0x54)
 2730: 0.077020856 munmap(0x28b00000,1048576)    = 0 (0x0)
 2730: 0.077247732 posix_fallocate(0x3,0x0,0x0,0x200000,0x0,0x0) ERR#22 'Invalid argument'
 2730: 0.077727160 ftruncate(3,0x20000000000000) = 0 (0x0)
 2730: 0.078035234 mmap(0x0,2097152,PROT_READ|PROT_WRITE,MAP_SHARED,3,0x0) = 1220542464 (0x48c00000)
 2730: 0.078363100 fstatat(AT_FDCWD,"/tmp/TestFallocate3866123553/001/a.out",{ mode=-rwxr-xr-x ,inode=36238,size=2097152,blksize=32768 },0x0) = 
0 (0x0)
 2730: 0.078878674 write(1,"    fallocate_test.go:60: unexpe"...,84) = 84 (0x54)
 2730: 0.079122998 munmap(0x48c00000,2097152)    = 0 (0x0)
 2730: 0.079356228 posix_fallocate(0x3,0x0,0x0,0x300000,0x0,0x0) ERR#22 'Invalid argument'
 2730: 0.079831698 ftruncate(3,0x30000000000000) = 0 (0x0)
 2730: 0.080122792 mmap(0x0,3145728,PROT_READ|PROT_WRITE,MAP_SHARED,3,0x0) = 1220542464 (0x48c00000)
 2730: 0.080435606 fstatat(AT_FDCWD,"/tmp/TestFallocate3866123553/001/a.out",{ mode=-rwxr-xr-x ,inode=36238,size=3145728,blksize=32768 },0x0) = 
0 (0x0)
 2730: 0.081043212 write(1,"    fallocate_test.go:60: unexpe"...,84) = 84 (0x54)
 2730: 0.081286025 munmap(0x48c00000,3145728)    = 0 (0x0)
 2730: 0.081493526 close(3)                      = 0 (0x0)

I wrote a small C program and in the trace it looks completely broken, but no EINVAL:

posix_fallocate(0x3,0x400,0x0,0x0,0x400,0x0)     = 0 (0x0)

vs our Go

posix_fallocate(0x3,0x0,0x0,0x400,0x0,0x0) ERR#22 'Invalid argument'

cherrymui · 2023-04-04T01:41:06Z

Looks like the C and Go programs pass arguments in different order? What arguments do your C program pass?

paulzhol · 2023-04-04T06:38:29Z

#include <unistd.h>
#include <fcntl.h>

int main() {
    int fd = open("file.dat", O_RDWR|O_CREAT, 0644);
    posix_fallocate(fd, 0, 1024);
    posix_fallocate(fd, 0, 1<<20);
    close(fd);
}

amd64:

openat(AT_FDCWD,"file.dat",O_RDWR|O_CREAT,0644)	 = 3 (0x3)
posix_fallocate(0x3,0x0,0x400)			 = 0 (0x0)
posix_fallocate(0x3,0x0,0x100000)		 = 0 (0x0)
close(3)					 = 0 (0x0)

i386:

openat(AT_FDCWD,"file.dat",O_RDWR|O_CREAT,0644)	 = 3 (0x3)
freebsd32_posix_fallocate(0x3,0x0,0x0,0x400,0x0) = 0 (0x0)
freebsd32_posix_fallocate(0x3,0x0,0x0,0x100000,0x0) = 0 (0x0)
close(3)					 = 0 (0x0)

armv7:

openat(AT_FDCWD,"file.dat",O_RDWR|O_CREAT,0644)	 = 3 (0x3)
posix_fallocate(0x3,0x400,0x0,0x0,0x400,0x0)	 = 0 (0x0)
posix_fallocate(0x3,0x100000,0x0,0x0,0x100000,0x0) = 0 (0x0)
close(3)					 = 0 (0x0)

The i386 looks correct, but on arm it is as if the low qword of the len is passed as the second argument.
I could be just a truss bug though.

bcmills · 2023-04-04T12:51:42Z

Oh! This is probably related to CL 479715 (attn @tklauser).

tklauser · 2023-04-04T13:07:58Z

Oh! This is probably related to CL 479715 (attn @tklauser).

Sorry about that. I wasn't able to test on arm at that time due to the builder being down and not having another freebsd/arm machine available. Sent CL 481621 with a fix.

gopherbot · 2023-04-04T13:08:22Z

Change https://go.dev/cl/481621 mentions this issue: internal/syscall/unix: fix PosixFallocate syscall argument order on freebsd/386

paulzhol · 2023-04-04T13:19:56Z

Something still doesn't make sense. The freebsd-riscv64-unmatched builder exhibits the ZFS block size test failure, but the system call there presumably returns EINVAL (as seen when running the test manually on an amd64 with a ZFS filesystem).
And for Go to match the C truss output, we'd need to do
syscall.Syscall6(posixFallocateTrap, uintptr(fd), uintptr(size>>32), uintptr(off), uintptr(off>>32), uintptr(size), uintptr(size>>32))

bcmills · 2023-04-04T13:31:08Z

https://man.freebsd.org/cgi/man.cgi?query=posix_fallocate&sektion=2&n=1 says:

If successful, posix_fallocate() returns zero. It returns an error on failure, without setting errno.

So I think the syscall wrapper needs to be checking the r1 result from the call for the error, rather than the err result.

paulzhol · 2023-04-04T13:33:33Z

And for Go to match the C truss output, we'd need to do
syscall.Syscall6(posixFallocateTrap, uintptr(fd), uintptr(size>>32), uintptr(off), uintptr(off>>32), uintptr(size), uintptr(size>>32))

@tklauser there's a comment in about alignment in syscall/mksyscall.pl:

go/src/syscall/mksyscall.pl

Lines 216 to 227 in f62c970

    
           } elsif($type eq "int64" && $_32bit ne "") { 
        
           	if(@args % 2 && $arm) { 
        
           		# arm abi specifies 64-bit argument uses 
        
           		# (even, odd) pair 
        
           		push @args, "0" 
        
           	} 
        
           	if($_32bit eq "big-endian") { 
        
           		push @args, "uintptr($name>>32)", "uintptr($name)"; 
        
           	} else { 
        
           		push @args, "uintptr($name)", "uintptr($name>>32)"; 
        
           	} 
        
           } else {

Is that where the 0 in your new CL coming from?
And then truss or clang just use the actual value as an optimization?

paulzhol · 2023-04-04T13:38:20Z

So I think the syscall wrapper needs to be checking the r1 result from the call for the error, rather than the err result.

@bcmills you're right! We can all blame OpenGroup for this :/

tklauser · 2023-04-04T13:42:21Z

https://man.freebsd.org/cgi/man.cgi?query=posix_fallocate&sektion=2&n=1 says:

If successful, posix_fallocate() returns zero. It returns an error on failure, without setting errno.

So I think the syscall wrapper needs to be checking the r1 result from the call for the error, rather than the err result.

@bcmills Right, I'll adjust the CL.

And for Go to match the C truss output, we'd need to do
syscall.Syscall6(posixFallocateTrap, uintptr(fd), uintptr(size>>32), uintptr(off), uintptr(off>>32), uintptr(size), uintptr(size>>32))

@tklauser there's a comment in about alignment in syscall/mksyscall.pl:

go/src/syscall/mksyscall.pl

Lines 216 to 227 in f62c970

} elsif($type eq "int64" && $_32bit ne "") {

if(@args % 2 && $arm) {

# arm abi specifies 64-bit argument uses

# (even, odd) pair

push @args, "0"

}

if($_32bit eq "big-endian") {

push @args, "uintptr($name>>32)", "uintptr($name)";

} else {

push @args, "uintptr($name)", "uintptr($name>>32)";

}

} else {

Is that where the 0 in your new CL coming from?

Yes, I think so. Though I was using mksyscall.go from x/sys/unix, but that has the same logic:

https://cs.opensource.google/go/x/sys/+/master:unix/mksyscall.go;l=237-247

And then truss or clang just use the actual value as an optimization?

I'm not sure how truss and and clang implement this :(

bcmills added OS-FreeBSD Builders x/build issues (builders, bots, dashboards) arch-riscv Issues solely affecting the riscv64 architecture. compiler/runtime Issues related to the Go compiler and/or runtime. labels Mar 31, 2023

bcmills modified the milestones: Gccgo, Backlog Mar 31, 2023

mknyszek added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Apr 3, 2023

tklauser self-assigned this Apr 4, 2023

gopherbot closed this as completed in a156e02 Apr 5, 2023

golang locked and limited conversation to collaborators Apr 4, 2024

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cmd/link/internal/ld: TestFallocate consistently failing on freebsd-riscv64-unmatched #59352

cmd/link/internal/ld: TestFallocate consistently failing on freebsd-riscv64-unmatched #59352

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cmd/link/internal/ld: TestFallocate consistently failing on freebsd-riscv64-unmatched #59352

cmd/link/internal/ld: TestFallocate consistently failing on freebsd-riscv64-unmatched #59352

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