Improvements to agentic kernel build (better error logs) #6643
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dvyukov
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Jan 20, 2026
dvyukov
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dvyukov
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dvyukov
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dvyukov
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Currently, when the kernel build fails, syz-aflow prints something along the line of: failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "36" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=workdir/cache/build/1c6c481ef478edbb8bf3afb9d73e9ff157b1a204" "bzImage" "compile_commands.json"]: exit status 2 Which is not particularly helpful, especially because the build directory gets immediately wiped out and the source directory does not contain the extracted .config which makes reproduction especially annoying. The -s flag makes make "silent", meaning that it only prints errors and not all successfully built compilation units, which keeps the logs more concise.
Currently, when an error occurs, it is printed as part of many Spans, in
my experience 3 times:
2026/01/20 19:38:59 finished action crash-reproducer (1/4) in 1.570202281s
results:
CrashReport:
error:
reproducer did not crash
2026/01/20 19:38:59 finished flow patching (0/0) in 1.571440624s
results:
error:
reproducer did not crash
reproducer did not crash
exit status 1
After this change it is only printed once:
2026/01/20 19:36:42 starting action crash-reproducer (1/4)...
reproducer did not crash
exit status 1
While we are at it, let's also make it a constant to make the intent clearer.
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