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.

Reported-by: syzbot+cae54346a70bbceeff2c@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=cae54346a70bbceeff2c
Fixes: 9ff05123e3bf ("nilfs2: segment constructor")
Assisted-by: gemini:gemini-3.1-pro
Signed-off-by: Joshua Crofts <joshua.crofts1@gmail.com>
Acked-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Viacheslav Dubeyko <slava@dubeyko.com>

0 files changed, 0 insertions, 0 deletions