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Yu Kuai fa73dbe02e md/raid5: fix IO hang when array is broken with IO inflight 
[ Upstream commit a913d1f6a7 ]

Following test can cause IO hang:

mdadm -CvR /dev/md0 -l10 -n4 /dev/sd[abcd] --assume-clean --chunk=64K --bitmap=none
sleep 5
echo 1 > /sys/block/sda/device/delete
echo 1 > /sys/block/sdb/device/delete
echo 1 > /sys/block/sdc/device/delete
echo 1 > /sys/block/sdd/device/delete

dd if=/dev/md0 of=/dev/null bs=8k count=1 iflag=direct

Root cause:

1) all disks removed, however all rdevs in the array is still in sync,
IO will be issued normally.

2) IO failure from sda, and set badblocks failed, sda will be faulty
and MD_SB_CHANGING_PENDING will be set.

3) error recovery try to recover this IO from other disks, IO will be
issued to sdb, sdc, and sdd.

4) IO failure from sdb, and set badblocks failed again, now array is
broken and will become read-only.

5) IO failure from sdc and sdd, however, stripe can't be handled anymore
because MD_SB_CHANGING_PENDING is set:

handle_stripe
 handle_stripe
 if (test_bit MD_SB_CHANGING_PENDING)
  set_bit STRIPE_HANDLE
  goto finish
  // skip handling failed stripe

release_stripe
 if (test_bit STRIPE_HANDLE)
  list_add_tail conf->hand_list

6) later raid5d can't handle failed stripe as well:

raid5d
 md_check_recovery
  md_update_sb
   if (!md_is_rdwr())
    // can't clear pending bit
    return
 if (test_bit MD_SB_CHANGING_PENDING)
  break;
  // can't handle failed stripe

Since MD_SB_CHANGING_PENDING can never be cleared for read-only array,
fix this problem by skip this checking for read-only array.

Link: https://lore.kernel.org/linux-raid/20251117085557.770572-3-yukuai@fnnas.com
Fixes: d87f064f58 ("md: never update metadata when array is read-only.")
Signed-off-by: Yu Kuai <yukuai@fnnas.com>
Reviewed-by: Li Nan <linan122@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-12-18 13:55:13 +01:00
arch ARM: dts: samsung: exynos4412-midas: turn off SDIO WLAN chip during system suspend 2025-12-18 13:55:11 +01:00
block block/blk-throttle: Fix throttle slice time for SSDs 2025-12-18 13:55:00 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id 2025-12-18 13:54:47 +01:00
Documentation dt-bindings: PCI: amlogic: Fix the register name of the DBI region 2025-12-18 13:54:55 +01:00
drivers md/raid5: fix IO hang when array is broken with IO inflight 2025-12-18 13:55:13 +01:00
fs ext4: improve integrity checking in __mb_check_buddy by enhancing order-0 validation 2025-12-18 13:55:09 +01:00
include vfio/pci: Use RCU for error/request triggers to avoid circular locking 2025-12-18 13:55:12 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring/napi: fix io_napi_entry RCU accesses 2025-11-24 10:36:06 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel Reinstate "resource: avoid unnecessary lookups in find_next_iomem_res()" 2025-12-18 13:55:11 +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 mm/huge_memory: fix NULL pointer deference when splitting folio 2025-12-07 06:25:02 +09:00
net netfilter: nft_connlimit: update the count if add was skipped 2025-12-18 13:55:12 +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 kconfig/nconf: Initialize the default locale at startup 2025-12-01 11:43:36 +01:00
security ima: Handle error code returned by ima_filter_rule_match() 2025-12-18 13:55:04 +01:00
sound ASoC: Intel: catpt: Fix error path in hw_params() 2025-12-18 13:55:10 +01:00
tools selftests: bonding: add delay before each xvlan_over_bond connectivity check 2025-12-18 13:55:13 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying 2025-11-24 10:36:06 +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 6.12.62 2025-12-12 18:37:22 +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.