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Stop writes first, preserve the affected storage, and do not assume that a successful write() reached the disk. A Linux page-cache regression can leave data acknowledged by an application but still resident in RAM, a block-cache layer, or a volatile drive cache. Quiesce services, record the running kernel and storage stack, create an image or snapshot, then boot the last known-good kernel and test on a copy. Repair the filesystem only after preservation.
A rollback can stop the regression, but it cannot recreate bytes that were never persisted. Whether the newest data survives depends on application flushes, filesystem behavior, bcache or device-mapper cache mode, controller and drive flush handling, and the availability of a known-good backup.
What a page-cache regression can—and cannot—do
Linux normally treats a buffered file write as a change to memory-backed page-cache pages. The write() system call may return successfully while the kernel schedules writeback for later. A bug in writeback, invalidation, error reporting, or interaction with a filesystem can therefore produce an apparent success before stable storage contains the new bytes.
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The Linux kernel VFS documentation says that applications using buffered I/O normally call “fsync, fdatasync, msync or sync_file_range” so that data reaches the backing store and writeback errors are reported. Those calls are a boundary, not a guarantee that every layer below the filesystem is honest: a controller, hypervisor, drive, or cache device must honor flush and force-unit-access (FUA) requests.
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Page-cache corruption is not the same as a physically failing disk. It may affect only a particular kernel release, filesystem, mount option, workload, or storage path. Treat the exact combination as the incident scope; do not assume that every machine running the same distribution is affected.
First response: freeze the blast radius
Every additional write can overwrite evidence or make an inconsistent filesystem harder to reconstruct. Use the following order unless the machine is in immediate danger of hardware failure.
1. Stop application writers
- Stop databases, queues, virtual machines, containers, and background jobs that write the affected filesystem. Use the service manager or the application’s own quiesce procedure so it can close files cleanly.
- Disable automated cleanup, log rotation, indexing, replication, and scheduled jobs for the affected volume.
- If a service cannot be stopped, isolate the host from clients and make the workload as read-only as possible.
Do not delete logs, rotate them manually, run a “cleanup” script, or repeatedly reboot while you are still collecting evidence.
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2. Record the running environment
Save command output to storage that is not the incident volume, or copy it over a trusted administrative channel. These read-only commands establish what must be reproduced during testing:
date -u
uname -a
cat /proc/cmdline
cat /etc/os-release
findmnt -R -o TARGET,SOURCE,FSTYPE,OPTIONS
lsblk -e7 -o NAME,TYPE,SIZE,FSTYPE,MOUNTPOINTS,ROTA,MODEL,SERIAL
cat /proc/mounts
journalctl -k -b --no-pager
dmesg -TAlso record the distribution kernel package version, the bootloader entry selected, filesystem labels and UUIDs, RAID and LVM layout, storage-controller or hypervisor details, and recent application errors. Preserve the output with a timestamp. If the system has bcache or device-mapper cache, capture its status before changing anything.
3. Avoid repeated read-write mounts
If the service is stopped and the filesystem can be remounted without provoking more writes, a read-only remount may limit damage:
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mount -o remount,ro /mount/pointThis command is not universally safe or possible. A busy filesystem, a filesystem needing journal replay, or a layered device may reject it. Do not force an unmount or detach a cache merely to make the command succeed.
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Filesystem repair changes metadata. Once it has changed the original device, you may lose the ability to compare states or try a different recovery method. Make a storage snapshot or a sector-level image to separate media whenever the device is readable, and perform analysis on that copy.
Choose the least stressful acquisition method
- Storage snapshot: Use a snapshot that is independent of the affected volume’s write path. Confirm that the snapshot includes all layers—logical volume, cache metadata, and data device as applicable.
- Block-level image: Image the complete block device, not just a mounted directory, when metadata or an intermediate cache may be involved. Record the source size, sector size, and imaging tool’s complete log.
- Failing hardware: If the device reports uncorrectable I/O errors, disconnect it from normal service and prioritize an imaging workflow designed for failing media. Repeated filesystem checks on the original can turn a recoverable read problem into a larger failure.
Keep the original read-only and mark every copy with its creation time and source device identity. A copy is not automatically consistent: it reflects whatever data had reached that layer when the snapshot or image was made.
What to preserve from cache layers
For bcache and device-mapper cache, preserve both the backing device and the cache device, including metadata. In writeback mode, the cache can hold the newest version of blocks. Imaging only the backing device may therefore capture an older filesystem state while omitting the newest dirty blocks.
Test persistence deliberately
After writers are quiesced, test whether data can be forced through the stack. Use a disposable file on a test copy or a non-production test volume; do not experiment by writing to the only original.
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An application should check the return value of its synchronization call, not only the earlier buffered write. A minimal POSIX-style sequence is:
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fd = open(path, O_WRONLY|O_CREAT, 0600);
write(fd, buffer, length);
if (fsync(fd) == -1) record_error(errno);
close(fd);fdatasync() can be appropriate when metadata updates that are not required to read the data need not be forced; fsync() is the broader choice. sync_file_range() has narrower semantics and does not by itself provide all durability guarantees an application may expect. Use the filesystem and application’s documented durability contract.
fsync() can report a writeback error that an earlier buffered write() did not return. The VFS keeps an error cursor per open file description, so separate writers may observe the same recorded writeback error. The generic page-cache infrastructure does not remember which file description dirtied each page; consequently, the kernel cannot always identify the original writer that caused an error.
Inspect the kernel while flushing
Run these on the test copy or during a controlled maintenance window:
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sync
journalctl -k --since "10 minutes ago" --no-pager
dmesg -T | tail -n 200Look for writeback failures, I/O errors, filesystem aborts, cache metadata warnings, reset or timeout messages, and flush/FUA failures. A command that returns zero is useful evidence but not proof that every earlier write is durable; correlate it with kernel logs and the storage stack’s documented behavior.
Roll back to the last known-good kernel
Booting an older kernel is a containment and comparison step. It does not restore data that never reached stable storage.
Normal bootloader path
- Leave the suspect kernel installed so its version, modules, and evidence remain available, but do not select it for production.
- At the bootloader menu, open the “Advanced options” or equivalent entry and select the last kernel version known to work with this workload.
- Confirm the selected entry’s command line, root device, initramfs, and storage-controller options. A different command line can change behavior as much as the kernel version.
- Boot with nonessential writers disabled. Verify the kernel with
uname -abefore mounting the recovered copy read-write.
When the machine will not boot
Use the distribution’s recovery environment or a trusted live system. Mount the affected filesystem without write access, or do not mount it at all until its image is available. The recovery environment must support the filesystem, RAID/LVM layout, and cache metadata; otherwise it can misinterpret a healthy layered device as damaged.
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Compare kernels on a clone
Reproduce the workload on a clone or test snapshot under both kernels. Keep the filesystem, mount options, cache mode, controller firmware, and boot parameters constant. Compare writeback errors, application-level checksums, journal messages, cache dirty counts, and device errors. If only the newer kernel fails, keep it out of production while identifying the regression and its fixed release.
Handle bcache and device-mapper cache before detaching anything
A cache layer changes where the newest copy of a block may reside. Determine its mode and dirty-block state before stopping, detaching, replacing, or reassembling devices.
bcache modes
- Writeback: Writes may be acknowledged while dirty blocks wait on the cache device. The cache can contain the newest data.
- Writethrough: A write is acknowledged only after the backing device has accepted it, subject to the integrity of lower-level flush handling.
- Passthrough: The cache is bypassed. Switching to this mode is safe only when the cache is clean or coherency has otherwise been established.
Inspect bcache’s sysfs state and dirty-data counters using the paths provided by your distribution. Do not discard the cache or recreate its metadata because the backing filesystem appears inconsistent. The bcache documentation warns that unrecoverable dirty data can leave the filesystem unrecoverable and cause massive corruption.
device-mapper cache modes
- Writeback: Dirty blocks can exist only on the cache device until they are flushed to the origin.
- Writethrough: The origin is updated before acknowledgment, but lower layers still must honor flushes.
- Passthrough: I/O bypasses caching. The cache must be clean before switching to this mode.
Use the device-mapper status output to identify the target, mode, metadata health, and dirty-block count:
dmsetup status
lvs -a -o+devices,cache_mode,cache_dirty,cache_policyExact fields vary by device-mapper and LVM version. Treat missing or ambiguous status as a reason to stop and obtain the cache layer’s documented recovery procedure. If metadata requires checking or repair, userspace recovery tools are needed; do not guess at metadata edits.
Safe cache sequence
- Stop writers and preserve both cache and origin devices.
- Record mode, dirty count, metadata health, and device identifiers.
- Flush using the layer’s documented clean or detach operation, watching for errors.
- Only after the cache reports clean should you switch to passthrough or detach it.
- Reassemble the stack on a clone first and compare filesystem and application state.
Account for volatile hardware write-back caches
A drive or controller with volatile write-back RAM may acknowledge a write before non-volatile media receives it. Linux therefore issues explicit flushes and FUA for data-integrity operations such as fsync, sync, and unmount. The guarantee depends on every layer honoring those requests.
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Check controller, drive, RAID, virtual-machine, and storage-network documentation for volatile-cache settings and battery- or capacitor-backed protection. A hypervisor that reports flush completion without forcing the host media breaks the durability contract. If you cannot establish that flushes and FUA are honored, treat recently acknowledged data as uncertain and plan restoration from a known-good backup.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Repair the filesystem only on the preserved copy
Do not run a repair utility on the original device merely because a mount fails. First verify that the image or snapshot is complete and readable, then work offline or from read-only recovery media.
Use the filesystem’s own checker
Commands differ by filesystem and distribution. The following are illustrative, non-modifying checks; substitute the correct device from the image and consult the filesystem project for the supported repair sequence:
# ext-family filesystems: report without modifying
fsck.ext4 -fn /dev/mapper/recovered-copy
# XFS: inspect without modifying
xfs_repair -n /dev/mapper/recovered-copy
# Btrfs: read-only structural check
btrfs check --readonly /dev/mapper/recovered-copyOptions and safety vary by release. Never run an ext-family checker against a mounted read-write filesystem. XFS repair must be run unmounted, and a read-only Btrfs check is not a substitute for a complete backup. Save the full output, including warnings and suggested repairs.
Apply repairs with a record
- Make a second copy of the image before any modifying repair.
- Run the distribution- and filesystem-recommended repair command against the copy.
- Capture stdout, stderr, exit status, tool version, and the image hash before and after.
- If the tool reports unrecoverable metadata or data, stop. Repeated attempts against the same original can destroy evidence; escalate to a specialist recovery workflow.
Verify before reopening service
Mount the repaired copy read-only first. Verification must test the application’s invariants, not only whether the directory tree mounts.
- Compare file counts, sizes, ownership, permissions, extended attributes, and hashes with the last known-good backup.
- For databases, run the vendor’s consistency or page-check utility and compare transaction-log sequence and checkpoint state.
- Check journal replay results and kernel logs for new writeback, checksum, timeout, or reset errors.
- Confirm that cache metadata is clean and that the recovered stack reports the expected mode.
- Exercise the workload on a clone under the known-good kernel before production. Include forced flushes and an orderly unmount in the test.
Only after these checks should you mount the repaired copy read-write and re-enable one writer at a time. Keep enhanced monitoring for writeback errors, device errors, cache dirty data, and application durability failures.
Choosing among recovery paths
When several options appear possible, compare them against the facts you have preserved rather than choosing the fastest command.
| Recovery path | Newest data may still be in cache? | Reversibility | Consistency risk | When it is appropriate |
|---|---|---|---|---|
| Immediate reboot into an older kernel | Yes; RAM, bcache, device-mapper, or drive cache may not have drained | Low unless an image exists | Can lose in-flight writes and trigger journal replay | Only after writers are stopped and preservation is addressed, or when continued operation is more dangerous |
| Snapshot or block image, then analyze | Yes, but the image preserves the state that was readable at capture | Highest; original remains untouched | Depends on snapshot consistency and complete layered capture | Preferred first action when the device is readable |
| Flush and clean a cache layer | Yes until the layer reports clean | Good if performed on a clone or with a second copy | Metadata or dirty-block loss can corrupt the filesystem | After mode and dirty state are known and the documented procedure is available |
| Filesystem repair on the original | No longer reliably observable | Lowest | Repair may remove evidence or discard unrecoverable structures | Last resort only when no image exists and continued access is impossible |
| Restore from a known-good backup | Unpersisted newest data is absent | High if the backup is verified | Depends on backup consistency and application replay | When flush behavior is untrusted or corruption exceeds the copy’s recoverability |
Common mistakes and their safer alternatives
- Mistake: treating
write()success as durable. Checkfsync()or the application’s documented synchronization call and inspect errors. - Mistake: rebooting repeatedly to “clear” page cache. Each reboot can lose volatile data and alter journal state. Preserve an image first.
- Mistake: detaching a dirty bcache or device-mapper cache. The cache may hold the newest blocks. Determine mode and dirty count, then use the documented clean procedure.
- Mistake: disabling drive write-back cache without understanding the stack. This may reduce performance but does not repair already uncertain writes. Establish whether flush and FUA are honored.
- Mistake: running
fsckon a mounted production filesystem. Use an offline checker against a copy and save its output. - Mistake: assuming a kernel rollback restores lost bytes. Rollback changes execution; it cannot reconstruct data that never reached non-volatile media.
- Mistake: validating only that the filesystem mounts. Compare hashes, database invariants, journal state, and application-level records before reopening service.
What “without losing data” can realistically mean
No recovery procedure can guarantee bytes that existed only in volatile memory or in a discarded dirty cache. The practical goal is to maximize recoverability: stop new writes, preserve every layer that may contain newer data, use a known-good kernel for controlled testing, and repair only disposable copies. If the storage path cannot prove that flushes and FUA reached non-volatile media, restore from a verified backup and treat the interval since the last trustworthy backup as potentially incomplete.
Keep the suspect kernel and original devices available for forensic comparison, but keep them out of production until the regression, cache behavior, and durability path are understood. Record the final kernel, mount options, cache mode, repair logs, verification results, and any files or transactions restored from backup.
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