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Johannes Thumshirn 9a447f748f btrfs: zoned: return EIO on RAID1 block group write pointer mismatch 
[ Upstream commit b0c26f4799 ]

There was a bug report about a NULL pointer dereference in
__btrfs_add_free_space_zoned() that ultimately happens because a
conversion from the default metadata profile DUP to a RAID1 profile on two
disks.

The stack trace has the following signature:

  BTRFS error (device sdc): zoned: write pointer offset mismatch of zones in raid1 profile
  BUG: kernel NULL pointer dereference, address: 0000000000000058
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 0 P4D 0
  Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI
  RIP: 0010:__btrfs_add_free_space_zoned.isra.0+0x61/0x1a0
  RSP: 0018:ffffa236b6f3f6d0 EFLAGS: 00010246
  RAX: 0000000000000000 RBX: ffff96c8132f3400 RCX: 0000000000000001
  RDX: 0000000010000000 RSI: 0000000000000000 RDI: ffff96c8132f3410
  RBP: 0000000010000000 R08: 0000000000000003 R09: 0000000000000000
  R10: 0000000000000000 R11: 00000000ffffffff R12: 0000000000000000
  R13: ffff96c758f65a40 R14: 0000000000000001 R15: 000011aac0000000
  FS: 00007fdab1cb2900(0000) GS:ffff96e60ca00000(0000) knlGS:0000000000000000
  CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000000058 CR3: 00000001a05ae000 CR4: 0000000000350ef0
  Call Trace:
  <TASK>
  ? __die_body.cold+0x19/0x27
  ? page_fault_oops+0x15c/0x2f0
  ? exc_page_fault+0x7e/0x180
  ? asm_exc_page_fault+0x26/0x30
  ? __btrfs_add_free_space_zoned.isra.0+0x61/0x1a0
  btrfs_add_free_space_async_trimmed+0x34/0x40
  btrfs_add_new_free_space+0x107/0x120
  btrfs_make_block_group+0x104/0x2b0
  btrfs_create_chunk+0x977/0xf20
  btrfs_chunk_alloc+0x174/0x510
  ? srso_return_thunk+0x5/0x5f
  btrfs_inc_block_group_ro+0x1b1/0x230
  btrfs_relocate_block_group+0x9e/0x410
  btrfs_relocate_chunk+0x3f/0x130
  btrfs_balance+0x8ac/0x12b0
  ? srso_return_thunk+0x5/0x5f
  ? srso_return_thunk+0x5/0x5f
  ? __kmalloc_cache_noprof+0x14c/0x3e0
  btrfs_ioctl+0x2686/0x2a80
  ? srso_return_thunk+0x5/0x5f
  ? ioctl_has_perm.constprop.0.isra.0+0xd2/0x120
  __x64_sys_ioctl+0x97/0xc0
  do_syscall_64+0x82/0x160
  ? srso_return_thunk+0x5/0x5f
  ? __memcg_slab_free_hook+0x11a/0x170
  ? srso_return_thunk+0x5/0x5f
  ? kmem_cache_free+0x3f0/0x450
  ? srso_return_thunk+0x5/0x5f
  ? srso_return_thunk+0x5/0x5f
  ? syscall_exit_to_user_mode+0x10/0x210
  ? srso_return_thunk+0x5/0x5f
  ? do_syscall_64+0x8e/0x160
  ? sysfs_emit+0xaf/0xc0
  ? srso_return_thunk+0x5/0x5f
  ? srso_return_thunk+0x5/0x5f
  ? seq_read_iter+0x207/0x460
  ? srso_return_thunk+0x5/0x5f
  ? vfs_read+0x29c/0x370
  ? srso_return_thunk+0x5/0x5f
  ? srso_return_thunk+0x5/0x5f
  ? syscall_exit_to_user_mode+0x10/0x210
  ? srso_return_thunk+0x5/0x5f
  ? do_syscall_64+0x8e/0x160
  ? srso_return_thunk+0x5/0x5f
  ? exc_page_fault+0x7e/0x180
  entry_SYSCALL_64_after_hwframe+0x76/0x7e
  RIP: 0033:0x7fdab1e0ca6d
  RSP: 002b:00007ffeb2b60c80 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
  RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fdab1e0ca6d
  RDX: 00007ffeb2b60d80 RSI: 00000000c4009420 RDI: 0000000000000003
  RBP: 00007ffeb2b60cd0 R08: 0000000000000000 R09: 0000000000000013
  R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
  R13: 00007ffeb2b6343b R14: 00007ffeb2b60d80 R15: 0000000000000001
  </TASK>
  CR2: 0000000000000058
  ---[ end trace 0000000000000000 ]---

The 1st line is the most interesting here:

 BTRFS error (device sdc): zoned: write pointer offset mismatch of zones in raid1 profile

When a RAID1 block-group is created and a write pointer mismatch between
the disks in the RAID set is detected, btrfs sets the alloc_offset to the
length of the block group marking it as full. Afterwards the code expects
that a balance operation will evacuate the data in this block-group and
repair the problems.

But before this is possible, the new space of this block-group will be
accounted in the free space cache. But in __btrfs_add_free_space_zoned()
it is being checked if it is a initial creation of a block group and if
not a reclaim decision will be made. But the decision if a block-group's
free space accounting is done for an initial creation depends on if the
size of the added free space is the whole length of the block-group and
the allocation offset is 0.

But as btrfs_load_block_group_zone_info() sets the allocation offset to
the zone capacity (i.e. marking the block-group as full) this initial
decision is not met, and the space_info pointer in the 'struct
btrfs_block_group' has not yet been assigned.

Fail creation of the block group and rely on manual user intervention to
re-balance the filesystem.

Afterwards the filesystem can be unmounted, mounted in degraded mode and
the missing device can be removed after a full balance of the filesystem.

Reported-by: 西木野羰基 <yanqiyu01@gmail.com>
Link: https://lore.kernel.org/linux-btrfs/CAB_b4sBhDe3tscz=duVyhc9hNE+gu=B8CrgLO152uMyanR8BEA@mail.gmail.com/
Fixes: b1934cd606 ("btrfs: zoned: handle broken write pointer on zones")
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-05-02 07:59:00 +02:00
arch PCI/MSI: Convert pci_msi_ignore_mask to per MSI domain flag 2025-05-02 07:58:56 +02:00
block block: make sure ->nr_integrity_segments is cloned in blk_rq_prep_clone 2025-05-02 07:58:54 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: api - Fix larval relookup type and mask 2025-04-10 14:39:20 +02:00
Documentation platform/x86: msi-wmi-platform: Workaround a ACPI firmware bug 2025-04-25 10:48:04 +02:00
drivers cpufreq: fix compile-test defaults 2025-05-02 07:59:00 +02:00
fs btrfs: zoned: return EIO on RAID1 block group write pointer mismatch 2025-05-02 07:59:00 +02:00
include drm/xe/bmg: Add one additional PCI ID 2025-05-02 07:58:58 +02:00
init ARM: 9443/1: Require linker to support KEEP within OVERLAY for DCE 2025-04-10 14:39:40 +02:00
io_uring block: add a rq_list type 2025-04-25 10:48:06 +02:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel dma/contiguous: avoid warning about unused size_bytes 2025-05-02 07:58:59 +02:00
lib lib/Kconfig.ubsan: Remove 'default UBSAN' from UBSAN_INTEGER_WRAP 2025-05-02 07:58:58 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/vmscan: don't try to reclaim hwpoison folio 2025-05-02 07:58:52 +02:00
net Bluetooth: l2cap: Process valid commands in too long frame 2025-04-25 10:47:51 +02:00
rust rust: Fix enabling Rust and building with GCC for LoongArch 2025-04-10 14:39:36 +02:00
samples tracing: Verify event formats that have "%*p.." 2025-05-02 07:58:52 +02:00
scripts scripts: generate_rust_analyzer: Add ffi crate 2025-04-25 10:48:04 +02:00
security landlock: Prepare to add second errata 2025-04-20 10:15:56 +02:00
sound ASoC: qcom: Fix sc7280 lpass potential buffer overflow 2025-04-25 10:47:50 +02:00
tools selftests/bpf: extend changes_pkt_data with cases w/o subprograms 2025-04-25 10:48:08 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Allow building irqbypass.ko as as module when kvm.ko is a module 2025-04-20 10:15:54 +02:00
.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: enable Clippy's check-private-items 2025-03-13 13:01:42 +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 MAINTAINERS: add entry for the Rust alloc module 2025-03-13 13:01:47 +01:00
Makefile Linux 6.12.25 2025-04-25 10:48:08 +02:00
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.