CUBELinux 7938966d6a
cubelinux: initialise STORE_FILE, the mutex that was never initialised ...
STORE_FILE is declared `unsafe(uninit) static ... Mutex<Option<StoreFile>> = None`
and nothing ever called STORE_FILE.init(). Its sibling SPACE_STARTS is initialised
explicitly in CubeStoreModule::init; this one was simply missed.
The failure mode is why it hid. A zeroed mutex satisfies the uncontended fast path
— the count reads 0, which means "unlocked" — so one writer at a time works and
nothing looks wrong. The first CONTENDED lock takes __mutex_lock_slowpath, which
splices the task into the mutex's wait list; that list is uninitialised, so its head
is NULL and the splice stores through it. A write to address 0 in kernel mode, after
which the task returns with interrupts disabled and preemption held — a machine that
cannot panic, log, or recover.
Found by verify-file-store.sh MODE=race: twelve concurrent puts to a store that is a
file on the root filesystem oopsed in cubelinux_store::store_file, while twelve
sequential ones passed with exact log accounting (816 bytes of log, generation 13).
The same signature is on the box, where the store had several writers and the box
froze with no panic despite panic=30.
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CUBELinux
7938966d6a