Assistance Needed: Viewing log.Logf Outputs of syz-fuzzer

waterlight m

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Jan 15, 2024, 4:34:18 AM1/15/24

to syzkaller

Hi,community!

I am currently debugging syz-fuzzer and using the hostfuzzer mode.
I have noticed that when using log.Logf to print information, there is no output in the terminal.
Could you please advise where I should look for these log entries, and whether they are only visible when syz-manager is in debug mode?

Any information would be greatly appreciated! Thank you for your assistance!

Dmitry Vyukov

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Jan 15, 2024, 4:50:53 AM1/15/24

to waterlight m, syzkaller

Hi waterlight,

The fuzzer output is only visible in debug mode and in crash logs.
Note there can be a hundred fuzzers connected to a single manager.

Aleksandr Nogikh

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Jan 15, 2024, 4:58:24 AM1/15/24

to Dmitry Vyukov, waterlight m, syzkaller

In case it might help:

When I need to debug something in syz-fuzzer, I sometimes add an extra
rpc call to log directly to the syz-manager. Something like this:
https://github.com/a-nogikh/syzkaller/commit/f19d11db1a7d2516efdc864b19ecf8be822312cc

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waterlight m

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Jan 15, 2024, 7:33:19 AM1/15/24

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Thank you both for the swift help! Your guidance is greatly appreciated.

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