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Joanne Koong fbba8b00bb fuse: fix readahead reclaim deadlock 
commit bd5603eaae upstream.

Commit e26ee4efbc ("fuse: allocate ff->release_args only if release is
needed") skips allocating ff->release_args if the server does not
implement open. However in doing so, fuse_prepare_release() now skips
grabbing the reference on the inode, which makes it possible for an
inode to be evicted from the dcache while there are inflight readahead
requests. This causes a deadlock if the server triggers reclaim while
servicing the readahead request and reclaim attempts to evict the inode
of the file being read ahead. Since the folio is locked during
readahead, when reclaim evicts the fuse inode and fuse_evict_inode()
attempts to remove all folios associated with the inode from the page
cache (truncate_inode_pages_range()), reclaim will block forever waiting
for the lock since readahead cannot relinquish the lock because it is
itself blocked in reclaim:

>>> stack_trace(1504735)
 folio_wait_bit_common (mm/filemap.c:1308:4)
 folio_lock (./include/linux/pagemap.h:1052:3)
 truncate_inode_pages_range (mm/truncate.c:336:10)
 fuse_evict_inode (fs/fuse/inode.c:161:2)
 evict (fs/inode.c:704:3)
 dentry_unlink_inode (fs/dcache.c:412:3)
 __dentry_kill (fs/dcache.c:615:3)
 shrink_kill (fs/dcache.c:1060:12)
 shrink_dentry_list (fs/dcache.c:1087:3)
 prune_dcache_sb (fs/dcache.c:1168:2)
 super_cache_scan (fs/super.c:221:10)
 do_shrink_slab (mm/shrinker.c:435:9)
 shrink_slab (mm/shrinker.c:626:10)
 shrink_node (mm/vmscan.c:5951:2)
 shrink_zones (mm/vmscan.c:6195:3)
 do_try_to_free_pages (mm/vmscan.c:6257:3)
 do_swap_page (mm/memory.c:4136:11)
 handle_pte_fault (mm/memory.c:5562:10)
 handle_mm_fault (mm/memory.c:5870:9)
 do_user_addr_fault (arch/x86/mm/fault.c:1338:10)
 handle_page_fault (arch/x86/mm/fault.c:1481:3)
 exc_page_fault (arch/x86/mm/fault.c:1539:2)
 asm_exc_page_fault+0x22/0x27

Fix this deadlock by allocating ff->release_args and grabbing the
reference on the inode when preparing the file for release even if the
server does not implement open. The inode reference will be dropped when
the last reference on the fuse file is dropped (see fuse_file_put() ->
fuse_release_end()).

Fixes: e26ee4efbc ("fuse: allocate ff->release_args only if release is needed")
Cc: stable@vger.kernel.org
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Reported-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-01-08 10:14:31 +01:00
arch x86/msi: Make irq_retrigger() functional for posted MSI 2026-01-08 10:14:31 +01:00
block block: rate-limit capacity change info log 2026-01-08 10:14:14 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: af_alg - zero initialize memory allocated via sock_kmalloc 2026-01-08 10:14:28 +01:00
Documentation dt-bindings: PCI: qcom,pcie-sm8550: Add missing required power-domains and resets 2026-01-08 10:14:28 +01:00
drivers iommu/mediatek: fix use-after-free on probe deferral 2026-01-08 10:14:31 +01:00
fs fuse: fix readahead reclaim deadlock 2026-01-08 10:14:31 +01:00
include media: v4l2-mem2mem: Fix outdated documentation 2026-01-08 10:14:16 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring: fix min_wait wakeups for SQPOLL 2026-01-08 10:14:25 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel tracing: Fix fixed array of synthetic event 2026-01-08 10:14:29 +01:00
lib lib/vsprintf: Check pointer before dereferencing in time_and_date() 2025-12-18 13:54:57 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm shmem: fix recovery on rename failures 2026-01-08 10:13:54 +01:00
net hsr: hold rcu and dev lock for hsr_get_port_ndev 2026-01-08 10:14:27 +01:00
rust rust: kbuild: workaround rustdoc doctests modifier bug 2025-11-24 10:36:07 +01:00
samples samples: work around glibc redefining some of our defines wrong 2025-12-12 18:37:21 +01:00
scripts kbuild: Use objtree for module signing key path 2026-01-08 10:13:56 +01:00
security KEYS: trusted: Fix a memory leak in tpm2_load_cmd 2026-01-08 10:14:13 +01:00
sound ALSA: wavefront: Clear substream pointers on close 2026-01-08 10:14:26 +01:00
tools tools/testing/nvdimm: Use per-DIMM device handle 2026-01-08 10:14:20 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot 2026-01-08 10:14:21 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:25:02 +09:00
Makefile Linux 6.12.63 2025-12-18 13:55:23 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.