Differential D55145
fusefs: Fix vnode lock mismatch in fuse_internal_do_getattr() Authored by guest-seuros on Feb 6 2026, 3:57 PM. Tags None Referenced Files
Details
fuse_internal_cache_attrs() requires an exclusive vnode lock fuse_read_biobackend() [LK_SHARED]
=> fuse_vnode_size()
-> fuse_internal_do_getattr()
=> fuse_internal_cache_attrs() [needs LK_EXCLUSIVE]This caused lock assertion panics during read operations. The panic was happening when i tried to write files to an usb exfat.
Diff Detail
Event TimelineComment Actions Thanks for your attention in this area. As a matter of fact, I've been working on this exact same problem. My first attempt at a solution was close to this one, but ultimately it won't work. Today I'm going to try a different solution, based on mutex protection rather than the vnode lock. I'll update Bugzilla when I have a working patch, so you can subscribe to this bug to find out. Comment Actions Sure i can close this diff. But can you tell me what won't work ? I use 16-Current and have INVARIANTS after this patch, i could transfer 50GB without any issue to the usb, checked checksum and all. The system is stable for many days now. Comment Actions There are other code paths that also need to modify the cached attributes, but where it isn't possible to upgrade the vnode lock to exclusive. |