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Merge pull request #7521 from ncfavier/migration-deadlock

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Release shared lock before acquiring exclusive lock
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Théophane Hufschmitt 2023-01-02 11:08:43 +01:00 committed by GitHub
commit e8a3e58171
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src/libstore/local-store.cc
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@ -91,6 +91,7 @@ void migrateCASchema(SQLite& db, Path schemaPath, AutoCloseFD& lockFd)
if (!lockFile(lockFd.get(), ltWrite, false)) { if (!lockFile(lockFd.get(), ltWrite, false)) {
printInfo("waiting for exclusive access to the Nix store for ca drvs..."); printInfo("waiting for exclusive access to the Nix store for ca drvs...");
lockFile(lockFd.get(), ltNone, false); // We have acquired a shared lock; release it to prevent deadlocks
lockFile(lockFd.get(), ltWrite, true); lockFile(lockFd.get(), ltWrite, true);
} }
@ -299,6 +300,7 @@ LocalStore::LocalStore(const Params & params)
if (!lockFile(globalLock.get(), ltWrite, false)) { if (!lockFile(globalLock.get(), ltWrite, false)) {
printInfo("waiting for exclusive access to the Nix store..."); printInfo("waiting for exclusive access to the Nix store...");
lockFile(globalLock.get(), ltNone, false); // We have acquired a shared lock; release it to prevent deadlocks
lockFile(globalLock.get(), ltWrite, true); lockFile(globalLock.get(), ltWrite, true);
} }