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test: deflake test-worker-message-port-transfer-filehandle-fd0 - #66980
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The child closed stdin and expected the next open() to return fd 0, but another thread can open a descriptor in between and take it. Pass the file to the child as stdin and wrap fd 0 in a FileHandle, so it is open from the start. After the transfer is discarded, accept an fd 0 that was reused for another file. Signed-off-by: Christian Aurich Zanettini Martins <christian.aurichzm@gmail.com>
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## main #66980 +/- ##
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+ Coverage 90.58% 90.60% +0.02%
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Lines 278298 278298
Branches 53523 53513 -10
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+ Misses 16570 16519 -51
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test-worker-message-port-transfer-filehandle-fd0closes stdin in a child and expects the nextopen()to return fd 0. That only holds if no other thread opens a descriptor in between, which Node.js does not guarantee: V8's GC threads, for example, read/sys/devices/system/cpu/onlinethe first time they contend on a lock. Onubuntu2404_sharedlibs_withoutssl_x64the test failed twice with17 !== 0, andtest-filehandle-closerecently hit the same kind of fd reuse there (#66750).The parent now passes the test file as the child's stdin, and the child wraps fd 0 in a
FileHandle, so the descriptor is open from the start. After the transfer is discarded, the test accepts an fd 0 that was reused for another file.I could not reproduce the CI failure without forcing the race. With a preload that keeps a worker opening and closing
/dev/zero, the test fails 120/200 onmainand 0/500 with this change, and it still fails 20/20 if~TransferData()skips fd 0 again.Refs: nodejs/reliability#1701
Refs: #66750