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executor: remote cover enable write trace failed (errno 17) #4626

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dvyukov opened this issue Apr 2, 2024 · 1 comment · May be fixed by #4893
Open

executor: remote cover enable write trace failed (errno 17) #4626

dvyukov opened this issue Apr 2, 2024 · 1 comment · May be fixed by #4893
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@dvyukov
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dvyukov commented Apr 2, 2024

This bug happens a lot when fuzzing v6.8 kernel:

2024/03/29 11:41:48 SYZFATAL: executor 7 failed 11 times: executor 7: EOF
remote cover enable write trace failed (errno 17)

Also happens on syzbot.
@dvyukov dvyukov added the bug label Apr 2, 2024
@a-nogikh
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I've sent https://lore.kernel.org/all/[email protected]/ with a fix.

a-nogikh added a commit to a-nogikh/syzkaller that referenced this issue Jun 12, 2024
@a-nogikh
executor: use different remote kcov handles each time
dc1bf5b 
It serves two purposes:
1) Ignore the remote coverage that was initiated by the already exited
   executor instances.
2) Circumvent the KCOV bug that sometimes results in dangling remote
   kcov handles. The bug is fixed in [1], but it will take time for it
   to reach all the kernels we fuzz.

Fixes google#4626.

[1] https://lore.kernel.org/all/[email protected]/
@a-nogikh a-nogikh linked a pull request Jun 12, 2024 that will close this issue
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executor: use different remote kcov handles each time a-nogikh/syzkaller
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@dvyukov @a-nogikh