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Commitfe6a19d40c("md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations") converted still_degraded from int to bool, but inverted the assignment in the loop that checks whether the array will still be degraded after the current device is recovered: "still_degraded = 1" became "still_degraded = false". As a result, recovering a device while another mirror is still missing calls md_bitmap_start_sync() with degraded == false, which clears bitmap bits that the still-missing device needs. When that device is re-added, its bitmap-based recovery finds the bits already cleared and skips every region written while the array was degraded, so it is marked In_sync while holding stale data: silent corruption. Reproducer (raid10 near=2, 4 disks, internal bitmap): - fail and remove one disk of each mirror pair - write to the degraded array - re-add both disks and let recovery finish - "check" reports mismatch_cnt=262272 after 256 MiB of degraded writes and file contents differ; the second disk's "recovery" completes in milliseconds because everything is skipped The same conversion in raid1 got it right (still_degraded = true). Restore the correct value. Fixes:fe6a19d40c("md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations") Cc: stable@vger.kernel.org Signed-off-by: Yunye Zhao <yunye.zhao@linux.alibaba.com> Reviewed-by: Mykola Marzhan <mykola@meshstor.io> Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de> Reviewed-by: Yu Kuai <yukuai@fygo.io> Link: https://patch.msgid.link/20260723135535.101995-2-yunye.zhao@linux.alibaba.com Signed-off-by: Yu Kuai <yukuai@fygo.io>
Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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