The patch titled Subject: nilfs2: fix deadlock in nilfs_count_free_blocks() has been added to the -mm mm-hotfixes-unstable branch. Its filename is nilfs2-fix-deadlock-in-nilfs_count_free_blocks.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Ryusuke Konishi konishi.ryusuke@gmail.com Subject: nilfs2: fix deadlock in nilfs_count_free_blocks() Date: Sat, 29 Oct 2022 13:49:12 +0900

A semaphore deadlock can occur if nilfs_get_block() detects metadata corruption while locating data blocks and a superblock writeback occurs at the same time:

task 1 task 2 ------ ------ * A file operation * nilfs_truncate() nilfs_get_block() down_read(rwsem A) <-- nilfs_bmap_lookup_contig() ... generic_shutdown_super() nilfs_put_super() * Prepare to write superblock * down_write(rwsem B) <-- nilfs_cleanup_super() * Detect b-tree corruption * nilfs_set_log_cursor() nilfs_bmap_convert_error() nilfs_count_free_blocks() __nilfs_error() down_read(rwsem A) <-- nilfs_set_error() down_write(rwsem B) <--

*** DEADLOCK ***

Here, nilfs_get_block() readlocks rwsem A (= NILFS_MDT(dat_inode)->mi_sem) and then calls nilfs_bmap_lookup_contig(), but if it fails due to metadata corruption, __nilfs_error() is called from nilfs_bmap_convert_error() inside the lock section.

Since __nilfs_error() calls nilfs_set_error() unless the filesystem is read-only and nilfs_set_error() attempts to writelock rwsem B (= nilfs->ns_sem) to write back superblock exclusively, hierarchical lock acquisition occurs in the order rwsem A -> rwsem B.

Now, if another task starts updating the superblock, it may writelock rwsem B during the lock sequence above, and can deadlock trying to readlock rwsem A in nilfs_count_free_blocks().

However, there is actually no need to take rwsem A in nilfs_count_free_blocks() because it, within the lock section, only reads a single integer data on a shared struct with nilfs_sufile_get_ncleansegs(). This has been the case after commit aa474a220180 ("nilfs2: add local variable to cache the number of clean segments"), that is, even before this bug was introduced.

So, this resolves the deadlock problem by just not taking the semaphore in nilfs_count_free_blocks().

Link: https://lkml.kernel.org/r/20221029044912.9139-1-konishi.ryusuke@gmail.com Fixes: e828949e5b42 ("nilfs2: call nilfs_error inside bmap routines") Signed-off-by: Ryusuke Konishi konishi.ryusuke@gmail.com Reported-by: syzbot+45d6ce7b7ad7ef455d03@syzkaller.appspotmail.com Tested-by: Ryusuke Konishi konishi.ryusuke@gmail.com Cc: stable@vger.kernel.org [2.6.38+ Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

fs/nilfs2/the_nilfs.c | 2 -- 1 file changed, 2 deletions(-)

--- a/fs/nilfs2/the_nilfs.c~nilfs2-fix-deadlock-in-nilfs_count_free_blocks +++ a/fs/nilfs2/the_nilfs.c @@ -690,9 +690,7 @@ int nilfs_count_free_blocks(struct the_n { unsigned long ncleansegs;

- down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile); - up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); *nblocks = (sector_t)ncleansegs * nilfs->ns_blocks_per_segment; return 0; } _

Patches currently in -mm which might be from konishi.ryusuke@gmail.com are

nilfs2-fix-deadlock-in-nilfs_count_free_blocks.patch nilfs2-fix-shift-out-of-bounds-overflow-in-nilfs_sb2_bad_offset.patch nilfs2-fix-shift-out-of-bounds-due-to-too-large-exponent-of-block-size.patch