From: Baokun Li libaokun1@huawei.com

[ Upstream commit 7e91ae31e2d264155dfd102101afc2de7bd74a64 ]

Otherwise, if ext4_inode_attach_jinode() fails, a hung task will happen because filemap_invalidate_unlock() isn't called to unlock mapping->invalidate_lock. Like this:

EXT4-fs error (device sda) in ext4_setattr:5557: Out of memory INFO: task fsstress:374 blocked for more than 122 seconds. Not tainted 6.14.0-rc1-next-20250206-xfstests-dirty #726 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:fsstress state:D stack:0 pid:374 tgid:374 ppid:373 task_flags:0x440140 flags:0x00000000 Call Trace: <TASK> __schedule+0x2c9/0x7f0 schedule+0x27/0xa0 schedule_preempt_disabled+0x15/0x30 rwsem_down_read_slowpath+0x278/0x4c0 down_read+0x59/0xb0 page_cache_ra_unbounded+0x65/0x1b0 filemap_get_pages+0x124/0x3e0 filemap_read+0x114/0x3d0 vfs_read+0x297/0x360 ksys_read+0x6c/0xe0 do_syscall_64+0x4b/0x110 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Fixes: c7fc0366c656 ("ext4: partial zero eof block on unaligned inode size extension") Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Jan Kara jack@suse.cz Reviewed-by: Brian Foster bfoster@redhat.com Link: https://patch.msgid.link/20250213112247.3168709-1-libaokun@huaweicloud.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Ricardo Cañuelo Navarro rcn@igalia.com --- Hi,

Requesting this fix to be backported to stable v6.6 and v6.12, which contain the backport for upstream patch c7fc0366c656 ("ext4: partial zero eof block on unaligned inode size extension"). That patch was also backported to v6.14 but the fix is there already as well.

Thanks, Ricardo --- fs/ext4/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index ddfeaf19bff1ba22cea7e108c0564daceb09e9ee..ebb8097b11397fb3e8c005035a808712ac31ee77 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5478,7 +5478,7 @@ int ext4_setattr(struct mnt_idmap *idmap, struct dentry *dentry, oldsize & (inode->i_sb->s_blocksize - 1)) { error = ext4_inode_attach_jinode(inode); if (error) - goto err_out; + goto out_mmap_sem; }

handle = ext4_journal_start(inode, EXT4_HT_INODE, 3);

--- base-commit: 23ec0b4057294d86cdefafe373b1f03568f75aff change-id: 20250429-rcn-20250429-v6-6-backport-a299b0c87086