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Alistair Popple 98c183a4fc fs/dax: don't disassociate zero page entries Prior to commit `38607c62b3` ("fs/dax: properly refcount fs dax pages") dax_associate_entry() and dax_disassociate_entry() would implicitly skip zero and empty dax entries using the for_each_mapped_pfn() macro. The use of compound ZONE_DEVICE folios removed the need for this macro and so it was removed, leading dax_folio_put() to be called on zero pages. This lead to the below warning. To fix this explicitly skip zero and empty entries in dax_associate/disassociate_entry(). [ 27.536963] ------------[ cut here ]------------ [ 27.537674] WARNING: CPU: 11 PID: 874 at fs/dax.c:415 dax_folio_put.isra.0+0x10d/0x170 [ 27.538844] Modules linked in: nd_pmem nd_btt nd_e820 libnvdimm [ 27.539732] CPU: 11 UID: 0 PID: 874 Comm: ctl_prefault Tainted: G W 6.14.0-rc2+ #1104 [ 27.541093] Tainted: [W]=WARN [ 27.541549] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/204 [ 27.543197] RIP: 0010:dax_folio_put.isra.0+0x10d/0x170 [ 27.543970] Code: 20 48 85 c0 0f 84 29 ff ff ff 48 83 e8 01 48 89 47 20 0f 84 1b ff ff ff 48 83 c4 10 5b 5d 41 5c c3 cc cc4 [ 27.546723] RSP: 0000:ffff961e4102fae0 EFLAGS: 00010002 [ 27.547505] RAX: 0000000000000001 RBX: ffffc9cce4e18000 RCX: 0000000000000009 [ 27.548564] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8a2a7badca40 [ 27.549630] RBP: ffffc9cce4e18000 R08: 0000000000009ffb R09: 00000000ffffdfff [ 27.550691] R10: 00000000ffffdfff R11: ffffffffa4e823a0 R12: 0000000000000000 [ 27.551748] R13: 0000000000000000 R14: 0000000010f10005 R15: 0000000000000004 [ 27.552819] FS: 00007f5f539d74c0(0000) GS:ffff8a2a7bac0000(0000) knlGS:0000000000000000 [ 27.554015] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.554873] CR2: 00007f5f52e00000 CR3: 0000000909340000 CR4: 00000000000006f0 [ 27.555938] Call Trace: [ 27.556318] <TASK> [ 27.556650] ? __warn+0x91/0x190 [ 27.557146] ? dax_folio_put.isra.0+0x10d/0x170 [ 27.557824] ? report_bug+0x164/0x190 [ 27.558378] ? handle_bug+0x54/0x90 [ 27.558898] ? exc_invalid_op+0x17/0x70 [ 27.559489] ? asm_exc_invalid_op+0x1a/0x20 [ 27.560125] ? dax_folio_put.isra.0+0x10d/0x170 [ 27.560808] dax_insert_entry+0x1e1/0x420 [ 27.561419] dax_fault_iter+0x252/0x860 [ 27.561995] dax_iomap_pmd_fault+0x23c/0x4a0 [ 27.562651] ext4_dax_huge_fault+0x1e2/0x450 [ 27.563296] __handle_mm_fault+0x6c8/0x12b0 [ 27.563920] ? do_user_addr_fault+0x1ca/0x670 [ 27.564577] ? lock_vma_under_rcu+0x178/0x3b0 [ 27.565235] handle_mm_fault+0xe5/0x290 [ 27.565816] do_user_addr_fault+0x208/0x670 [ 27.566446] exc_page_fault+0x6d/0x230 [ 27.567008] asm_exc_page_fault+0x26/0x30 [ 27.567610] RIP: 0033:0x7f5f543bcb4f [ 27.568152] Code: 45 f0 48 8b 45 f0 48 8b 4d f8 48 03 41 18 48 89 45 e8 48 8b 45 f0 48 3b 45 e8 0f 83 97 00 00 00 48 8b 458 [ 27.570895] RSP: 002b:00007ffc2d774460 EFLAGS: 00010287 [ 27.571672] RAX: 00007f5f52e00000 RBX: 0000000000200000 RCX: 000055760153fc00 [ 27.572731] RDX: 0000000000000000 RSI: 0000557601542a20 RDI: 000055760153fc00 [ 27.573787] RBP: 00007ffc2d774460 R08: 0000000000000000 R09: 0000000000000073 [ 27.574840] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc2d77534b [ 27.575897] R13: 00007ffc2d774aa0 R14: 0000000000800000 R15: 0000000000800000 [ 27.576961] </TASK> [ 27.577301] irq event stamp: 13394 [ 27.577810] hardirqs last enabled at (13393): [<ffffffffa3485780>] flush_tlb_mm_range+0x1c0/0x220 [ 27.579138] hardirqs last disabled at (13394): [<ffffffffa450d0c7>] _raw_spin_lock_irq+0x47/0x50 [ 27.580428] softirqs last enabled at (12530): [<ffffffffa433941a>] xs_tcp_send_request+0x22a/0x2e0 [ 27.581762] softirqs last disabled at (12528): [<ffffffffa40a60fd>] release_sock+0x1d/0xb0 [ 27.582986] ---[ end trace 0000000000000000 ]--- Link: https://lkml.kernel.org/r/20250319013301.369822-1-apopple@nvidia.com Signed-off-by: Alistair Popple <apopple@nvidia.com> Fixes: `38607c62b3` ("fs/dax: properly refcount fs dax pages") Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202503102229.122fbd6c-lkp@intel.com Cc: Dan Williams <dan.j.williams@intel.com> Cc: Alison Schofield <alison.schofield@intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Balbir Singh <balbirs@nvidia.com> Cc: "Darrick J. Wong" <djwong@kernel.org> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: John Hubbard <jhubbard@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2025-03-21 22:03:15 -07:00
arch	x86/mce: use is_copy_from_user() to determine copy-from-user context	2025-03-17 22:07:05 -07:00
block	block-6.14-20250306	2025-03-07 11:12:33 -10:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
Documentation	MM documentation: add "Unaccepted" meminfo entry	2025-03-21 22:03:14 -07:00
drivers	xen: balloon: update the NR_BALLOON_PAGES state	2025-03-21 22:03:13 -07:00
fs	fs/dax: don't disassociate zero page entries	2025-03-21 22:03:15 -07:00
include	meminfo: add a per node counter for balloon drivers	2025-03-21 22:03:13 -07:00
init	Kbuild updates for v6.14	2025-01-31 12:07:07 -08:00
io_uring	io_uring-6.14-20250306	2025-03-07 11:09:33 -10:00
ipc	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
kernel	fork: use __vmalloc_node() for stack allocation	2025-03-21 22:03:14 -07:00
lib	mm/filemap: use xas_try_split() in __filemap_add_folio()	2025-03-17 22:07:01 -07:00
LICENSES	LICENSES: add 0BSD license text	2024-09-01 20:43:24 -07:00
mm	balloon_compaction: update the NR_BALLOON_PAGES state	2025-03-21 22:03:13 -07:00
net	percpu: use TYPEOF_UNQUAL() in variable declarations	2025-03-16 22:05:53 -07:00
rust	Driver core api addition for 6.14-rc3	2025-02-16 12:54:42 -08:00
samples	samples/damon: a typo in the kconfig - sameple	2025-03-17 00:05:29 -07:00
scripts	kbuild: install-extmod-build: Fix build when specifying KBUILD_OUTPUT	2025-03-06 20:32:30 +09:00
security	Landlock fix for v6.14-rc5	2025-02-26 11:55:44 -08:00
sound	ALSA: hda/realtek: Add support for ASUS Zenbook UM3406KA Laptops using CS35L41 HDA	2025-03-05 19:52:56 +01:00
tools	selftests/mm: add commentary about 9pfs bugs	2025-03-21 22:03:14 -07:00
usr	kbuild: hdrcheck: fix cross build with clang	2025-03-05 04:06:45 +09:00
virt	KVM: remove kvm_arch_post_init_vm	2025-02-04 11:27:45 -05:00
.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	2025-01-10 00:17:25 +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	MAINTAINERS: Retire Ralf Baechle	2024-11-12 15:48:59 +01:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	rust: use host dylib naming convention to support macOS	2025-01-10 01:01:24 +01:00
.mailmap	33 hotfixes. 24 are cc:stable and the remainder address post-6.13 issues	2025-03-08 14:34:06 -10:00
.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	mm: zbud: remove zbud	2025-03-16 22:06:01 -07:00
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	MAINTAINERS: adjust file entry in MAPLE TREE	2025-03-17 22:07:05 -07:00
Makefile	Linux 6.14-rc6	2025-03-09 13:45:25 -10:00
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.