panic: unaligned 64-bit atomic operation on 32-bit arm host

[abferm]

Describe the bug
Panic from ingester on 32-bit arm hosts due to misaligned 64-bit atomic operation.

To Reproduce
Steps to reproduce the behavior:

1. Started grafana/loki:2.6.1-arm docker image
2. Started feeding logs with promtail

Expected behavior
No panic

Environment:

• Infrastructure: balena OS on 32-bit arm device
• Deployment tool: balena

Screenshots, Promtail config, or terminal output

 panic: unaligned 64-bit atomic operation
 
 goroutine 507 [running]:
 runtime/internal/atomic.panicUnaligned()
  /usr/local/go/src/runtime/internal/atomic/unaligned.go:8 +0x24
 runtime/internal/atomic.Xadd64(0x4cc88cc, 0x1)
  /usr/local/go/src/runtime/internal/atomic/atomic_arm.s:256 +0x14
 github.com/grafana/loki/pkg/logqlmodel/stats.(*Context).AddHeadChunkLines(...)
  /src/loki/pkg/logqlmodel/stats/context.go:225
 github.com/grafana/loki/pkg/chunkenc.(*unorderedHeadBlock).forEntries.func1(0x44a7dd0)
  /src/loki/pkg/chunkenc/unordered.go:169 +0x54
 github.com/grafana/loki/pkg/chunkenc.(*unorderedHeadBlock).forEntries(0x48b37c0, {0x1f85088, 0x4446400}, 0x0, 0x0, 0x7fffffffffffffff, 0x4b15ccc)
  /src/loki/pkg/chunkenc/unordered.go:194 +0x2a8
 github.com/grafana/loki/pkg/chunkenc.(*unorderedHeadBlock).Serialise(0x48b37c0, {0x76c918a8, 0x2e26858})
  /src/loki/pkg/chunkenc/unordered.go:335 +0x184
 github.com/grafana/loki/pkg/chunkenc.(*MemChunk).cut(0x4904810)
  /src/loki/pkg/chunkenc/memchunk.go:744 +0x130
 github.com/grafana/loki/pkg/chunkenc.(*MemChunk).Close(0x4904810)
  /src/loki/pkg/chunkenc/memchunk.go:692 +0x1c
 github.com/grafana/loki/pkg/ingester.(*Ingester).closeChunk(0x481f180, 0x49e0200, {0x1f7f080, 0x4b84b24})
  /src/loki/pkg/ingester/flush.go:340 +0x74
 github.com/grafana/loki/pkg/ingester.(*Ingester).flushChunks(0x481f180, {0x1f850a8, 0x49e02c0}, 0x1e84eee75f66f89d, {0x48b36c0, 0x2, 0x2}, {0x449fe58, 0x1, 0x2}, ...)
  /src/loki/pkg/ingester/flush.go:290 +0x31c
 github.com/grafana/loki/pkg/ingester.(*Ingester).flushUserSeries(0x481f180, {0x4ad6328, 0x4}, 0x1e84eee75f66f89d, 0x1)
  /src/loki/pkg/ingester/flush.go:172 +0x1c8
 github.com/grafana/loki/pkg/ingester.(*Ingester).flushLoop(0x481f180, 0x1d)
  /src/loki/pkg/ingester/flush.go:144 +0x2d4
 created by github.com/grafana/loki/pkg/ingester.(*Ingester).InitFlushQueues
  /src/loki/pkg/ingester/flush.go:47 +0x4c

[frepkovsky]

I think it is the same problem as discussed here #5388 but it has already been closed without solution...

[abferm]

This does appear to be the same issue. I thought I searched the closed issues, but obviously I didn't look hard enough.

[gtaws]

as commented on the linked issue, can someone PLEASE REMOVE loki-linux-arm.zip, as it's obviously broken now with no resolution.