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- W2942185437 abstract "We present C rash M onkey and A ce , a set of tools to systematically find crash-consistency bugs in Linux file systems. C rash M onkey is a record-and-replay framework which tests a given workload on the target file system by simulating power-loss crashes while the workload is being executed, and checking if the file system recovers to a correct state after each crash. A ce automatically generates all the workloads to be run on the target file system. We build C rash M onkey and A ce based on a new approach to test file-system crash consistency: bounded black-box crash testing ( B 3 ). B 3 tests the file system in a black-box manner using workloads of file-system operations. Since the space of possible workloads is infinite, B 3 bounds this space based on parameters such as the number of file-system operations or which operations to include, and exhaustively generates workloads within this bounded space. B 3 builds upon insights derived from our study of crash-consistency bugs reported in Linux file systems in the last 5 years. We observed that most reported bugs can be reproduced using small workloads of three or fewer file-system operations on a newly created file system, and that all reported bugs result from crashes after fsync()-related system calls. C rash M onkey and A ce are able to find 24 out of the 26 crash-consistency bugs reported in the last 5 years. Our tools also revealed 10 new crash-consistency bugs in widely used, mature Linux file systems, 7 of which existed in the kernel since 2014. Additionally, our tools found a crash-consistency bug in a verified file system, FSCQ. The new bugs result in severe consequences like broken rename atomicity, loss of persisted files and directories, and data loss." @default.
- W2942185437 created "2019-05-03" @default.
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- W2942185437 date "2019-04-20" @default.
- W2942185437 modified "2023-10-05" @default.
- W2942185437 title "CrashMonkey and ACE" @default.
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- W2942185437 doi "https://doi.org/10.1145/3320275" @default.
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