AZL-70771
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-70771.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-70771
- Upstream
- Published
- 2025-09-15T14:15:37Z
- Modified
- 2026-04-01T05:22:30.066999Z
- Summary
- CVE-2023-53149 affecting package kernel 5.15.200.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
ext4: avoid deadlock in fs reclaim with page writeback
Ext4 has a filesystem wide lock protecting ext4_writepages() calls to avoid races with switching of journalled data flag or inode format. This lock can however cause a deadlock like:
CPU0 CPU1
ext4writepages() percpudownread(sbi->swritepagesrwsem); ext4changeinodejournalflag() percpudownwrite(sbi->swritepagesrwsem); - blocks, all readers block from now on ext4dowritepages() ext4initioend() kmemcachezalloc(ioendcachep, GFPKERNEL) fsreclaim frees dentry... dentryunlinkinode() iput() - last ref => iputfinal() - inode dirty => writeinodenow()... ext4writepages() tries to acquire sbi->swritepagesrwsem and blocks forever
Make sure we cannot recurse into filesystem reclaim from writeback code to avoid the deadlock.
- References