torrent.(*Count).Int64 crash on arm(linux)

[xspeed1989]

[Switching to Thread 6677.6679]
0x00011fdc in runtime/internal/atomic.goLoad64 (addr=0x16fc1a4, ~r1=<optimized out>) at E:/Software/Go/src/runtime/internal/atomic/atomic_arm.go:131
131                     *(*int)(nil) = 0 // crash on unaligned uint64
(gdb) bt
#0  0x00011fdc in runtime/internal/atomic.goLoad64 (addr=0x16fc1a4, ~r1=<optimized out>) at E:/Software/Go/src/runtime/internal/atomic/atomic_arm.go:131
#1  0x0073f4a0 in github.com/anacrolix/torrent.(*Count).Int64 (me=0x16fc1a4, ~r0=0) at C:/Users/xspee/go/pkg/mod/github.com/anacrolix/torrent@v1.14.0/conn_stats.go:61
#2  0x007786bc in github.com/jpillora/cloud-torrent/engine.(*Torrent).updateLoaded (torrent=0x16fc120, t=0x1526400) at C:/Users/xspee/Desktop/simple-torrent/engine/torrent.go:90
#3  0x007780c8 in github.com/jpillora/cloud-torrent/engine.(*Torrent).Update (torrent=0x16fc120, t=0x1526400) at C:/Users/xspee/Desktop/simple-torrent/engine/torrent.go:54
#4  0x0077529c in github.com/jpillora/cloud-torrent/engine.(*Engine).upsertTorrent (e=0x14b2a50, tt=0x1526400, ~r1=0x0) at C:/Users/xspee/Desktop/simple-torrent/engine/engine.go:296
#5  0x00774308 in github.com/jpillora/cloud-torrent/engine.(*Engine).TaskRoutine (e=0x14b2a50) at C:/Users/xspee/Desktop/simple-torrent/engine/engine.go:221
#6  0x00836104 in github.com/jpillora/cloud-torrent/server.(*Server).backgroundRoutines.func1 (s=0x148f8c0) at C:/Users/xspee/Desktop/simple-torrent/server/server_bg.go:36
#7  0x0007452c in runtime.goexit () at E:/Software/Go/src/runtime/asm_arm.s:868
(gdb) frame 1
#1  0x0073f4a0 in github.com/anacrolix/torrent.(*Count).Int64 (me=0x16fc1a4, ~r0=0) at C:/Users/xspee/go/pkg/mod/github.com/anacrolix/torrent@v1.14.0/conn_stats.go:61
61              return atomic.LoadInt64(&me.n)

[anacrolix]

It's not clear where the usage of Count is occuring in @jpillora /cloud-torrent here. Can you link to the source for it for the backtrace above?

[xspeed1989]

@anacrolix
there is source
this project if forked from jpillora/cloud-torrent

[anacrolix]

@xspeed1989 the issue is most likely that your Torrent.Stats is not aligned. Try moving that field to the top of its parent struct. If that works, I'll add a comment to TorrentStats mentioning that it must be aligned on some platforms.

[xspeed1989]

@anacrolix OK, I will try it

[xspeed1989]

@anacrolix It's works fine!

[xspeed1989]

it's not your fault,2333333

[anacrolix]

See also #262.

[jpillora]

Apologies the cloud-torrent import of anacrolix/torrent is out of date. This might be the reason...

[anacrolix]

@jpillora sorry to drag this up, I think the issue was in a fork of your original repo.