podman machine init: panic: nil pointer dereference

[edsantiago]

Happens fairly often when running system tests in parallel. I have no idea what the trigger is:

# [11:43:36.833706343] $ ..../bin/podman machine init --image-path=/dev/null mt115_kszernsr
# [11:43:36.874815476] Flag --image-path has been deprecated, use --image instead
# panic: runtime error: invalid memory address or nil pointer dereference
# [signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x48e49e]
#
# goroutine 1 [running]:
# io.copyBuffer({0x1fb70a0, 0xc0005ba108}, {0x0, 0x0}, {0x0, 0x0, 0x0})
# 	/usr/lib/golang/src/io/io.go:429 +0x17e
# io.Copy(...)
# 	/usr/lib/golang/src/io/io.go:388
# github.com/containers/podman/v5/pkg/machine/compression.(*genericDecompressor).sparseOptimizedCopy(0x50b37e?, {0x1fbdd18, 0xc00008a0e8}, {0x0, 0x0})
# 	..../pkg/machine/compression/generic.go:85 +0xf6
# github.com/containers/podman/v5/pkg/machine/compression.(*uncompressedDecompressor).decompress(0xc000594230?, {0x1fbdd18?, 0xc00008a0e8?}, {0x0?, 0x0?})
# 	..../pkg/machine/compression/uncompressed.go:17 +0x29
# github.com/containers/podman/v5/pkg/machine/compression.runDecompression({0x1fc93c0, 0xc000243aa0}, {0xc000594230, 0x50})
# 	..../pkg/machine/compression/decompress.go:97 +0x4f2
# github.com/containers/podman/v5/pkg/machine/compression.Decompress(0xc000594230?, {0xc000594230, 0x50})
# 	..../pkg/machine/compression/decompress.go:43 +0x86
# github.com/containers/podman/v5/pkg/machine/stdpull.(*StdDiskPull).Get(0xc0002e8130)
# 	..../pkg/machine/stdpull/local.go:29 +0x145
# github.com/containers/podman/v5/pkg/machine/shim/diskpull.GetDisk({0x7ffdbc39b003?, 0x9?}, 0xc0005b1580?, 0xc000012180?, 0x0?, {0x7ffdbc39b00d?, 0xe?})
# 	..../pkg/machine/shim/diskpull/diskpull.go:31 +0x11c
# github.com/containers/podman/v5/pkg/machine/qemu.(*QEMUStubber).GetDisk(0x1c76fee?, {0x7ffdbc39b003?, 0xc000607870?}, 0x0?, 0x3?)
# 	..../pkg/machine/qemu/stubber.go:387 +0x3b
# github.com/containers/podman/v5/pkg/machine/shim.Init({0x6, 0x64, {0x0, 0x0}, {0x7ffdbc39b003, 0x9}, {0xc0005afc30, 0x1, 0x1}, {0x0, ...}, ...}, ...)
# 	..../pkg/machine/shim/host.go:154 +0x539
# github.com/containers/podman/v5/cmd/podman/machine.initMachine(0x2c8cec0, {0xc0005b1240, 0x1, 0x2})
# 	..../cmd/podman/machine/init.go:219 +0x6d8
# github.com/spf13/cobra.(*Command).execute(0x2c8cec0, {0xc0000400d0, 0x2, 0x2})
# 	..../vendor/github.com/spf13/cobra/command.go:985 +0xaca
# github.com/spf13/cobra.(*Command).ExecuteC(0x2c80580)
# 	..../vendor/github.com/spf13/cobra/command.go:1117 +0x3ff
# github.com/spf13/cobra.(*Command).Execute(...)
# 	..../vendor/github.com/spf13/cobra/command.go:1041
# github.com/spf13/cobra.(*Command).ExecuteContext(...)
# 	..../vendor/github.com/spf13/cobra/command.go:1034
# main.Execute()
# 	..../cmd/podman/root.go:115 +0xb4
# main.main()
# 	..../cmd/podman/main.go:61 +0x4b2
# [11:43:36.877805265] [ rc=2 ]

[Luap99]

I was able to reproduce with something like this

for i in {1..30}; do ./bin/podman machine init --image-path=/dev/null m$i &  done

However I am very lost with what is happing here there...

[Luap99]

The parallel run isn't necessary at all and likely a red hearing. This seems to be sort of a normal race that depends on timings