CVE-2026-90420

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

nilfs2: fix infinite loop in nilfs_clean_segments()

syzbot reported a hung task in nilfs_transaction_begin(). This occurs

because the cleaner ioctl falls into an infinite loop if

nilfs_segctor_construct() repeatedly returns -EROFS (e.g. the device

is remounted as read-only after an I/O error).

Currently in nilfs_clean_segments(), if err is non-zero, it logs the

error and sleeps but doesn't abort when it encounters a terminal error

like -EROFS. This causes the thread to loop forever.

Fix this by breaking out of the loop if nilfs_segctor_construct()

returns -EROFS. This matches the behaviour in

nilfs_segctor_write_out(), which also handles -EROFS.