content_unittests, webrunner_browsertests and webrunner_unittests consistently fail on the Fuchsia debug bot due to their size.
Sample failure:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/fuchsia-fyi-x64-dbg/4032

Sample log:
[00227.884] pkgsvr: pkgfs: asking amber to fetch 2538 blobs for {webrunner_browsertests 0}
[00227.893] pkgsvr: pkgfs: amber.GetBlob("b6f9ba0be4b48e8bb18079c07811ca499b161e89a449e957d0932a460a008cdc") failed: ErrPeerClosed: zx.Channel.Write
[00227.905] pkgsvr: pkgfs: amber.GetBlob("1e1cb6d3a2367cd1910478b5ec23db7d2364929e82964d6df1d5c148975a7850") failed: ErrPeerClosed: zx.Channel.Write
[00227.917] pkgsvr: pkgfs: amber.GetBlob("c0e07a6794be1535c4d971e6d9ef37667febea7b6c843b218037cc90d524e530") failed: ErrPeerClosed: zx.Channel.Write
[00256.428] Blobfs::AddBlocks FVM Extend failure
[00256.428] Blobfs has run out of space on persistent storage.
[00256.429]     Could not allocate 66437120 bytes
[00256.429]     Total data bytes  : 310378496
[00256.429]     Used data bytes   : 220168192
[00256.429]     Preallocated bytes: 19890176
[00256.429]     Free data bytes   : 70320128
[00256.429]     This allocation failure is the result of fragmentation.
[...]

The issue is that the FVM is limited to 1GB and these packages need to be copied in full to the KVM before they can be extracted and installed. With the way we currently build debug builds, they are more than 700MB large, leaving no space for extraction.
We can work around this by using compiler optimization options to lower the binary size.
 

content_unittests, webrunner_browsertests and webrunner_unittests consistently fail on the Fuchsia debug bot due to their size.
Sample failure:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/fuchsia-fyi-x64-dbg/4032

Sample log:
[00227.884] pkgsvr: pkgfs: asking amber to fetch 2538 blobs for {webrunner_browsertests 0}
[00227.893] pkgsvr: pkgfs: amber.GetBlob("b6f9ba0be4b48e8bb18079c07811ca499b161e89a449e957d0932a460a008cdc") failed: ErrPeerClosed: zx.Channel.Write
[00227.905] pkgsvr: pkgfs: amber.GetBlob("1e1cb6d3a2367cd1910478b5ec23db7d2364929e82964d6df1d5c148975a7850") failed: ErrPeerClosed: zx.Channel.Write
[00227.917] pkgsvr: pkgfs: amber.GetBlob("c0e07a6794be1535c4d971e6d9ef37667febea7b6c843b218037cc90d524e530") failed: ErrPeerClosed: zx.Channel.Write
[00256.428] Blobfs::AddBlocks FVM Extend failure
[00256.428] Blobfs has run out of space on persistent storage.
[00256.429]     Could not allocate 66437120 bytes
[00256.429]     Total data bytes  : 310378496
[00256.429]     Used data bytes   : 220168192
[00256.429]     Preallocated bytes: 19890176
[00256.429]     Free data bytes   : 70320128
[00256.429]     This allocation failure is the result of fragmentation.
[...]

The issue is that the FVM is limited to 1GB and these packages need to be copied in full to the /data portion of the FVM store before they can be extracted and installed. With the way we currently build debug builds, they are more than 700MB large, leaving no space for extraction.
We can work around this by using compiler optimization options to lower the binary size.