Linux EUVD-2026-59081

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()

When we mount device w/ gc_merge mount option, we may suffer below potential deadlock:

Kworker GC trehad Truncator

• f2fs_write_cache_pages
• f2fs_write_single_data_page
• f2fs_do_write_data_page
• folio_start_writeback --- set writeback flag on folio
• f2fs_outplace_write_data

: cached folio in internal bio cache

• f2fs_balance_fs
• wake_up(gc_thread)

: wake up gc thread to run foreground GC

• finish_wait(fggc_wq)

: wait on the waitqueue --- wait on GC thread to finish the work

• truncate_inode_pages_range
• __filemap_get_folio(, FGP_LOCK) --- lock folio
• truncate_inode_partial_folio
• folio_wait_writeback --- wait on writeback being cleared
• do_garbage_collect
• move_data_page
• f2fs_get_lock_data_folio
• lock on folio --- blocked on folio's lock

In order to avoid such deadlock, let's call below functions to commit cached bios in GC_MERGE path of f2fs_balance_fs() as the same as we did in NOGC_MERGE path.

• f2fs_submit_merged_write(sbi, DATA);
• f2fs_submit_all_merged_ipu_writes(sbi);