loop0: detected capacity change from 0 to 1024
EXT4-fs: Ignoring removed orlov option
EXT4-fs: Ignoring removed nomblk_io_submit option
======================================================
WARNING: possible circular locking dependency detected
6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 Not tainted
------------------------------------------------------
syz.0.78/6928 is trying to acquire lock:
ffff0000e7b26d10 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline]
ffff0000e7b26d10 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline]
ffff0000e7b26d10 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create+0xc40/0x1768 fs/ext4/xattr.c:1588

but task is already holding lock:
ffff0000f59da8b0 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_truncate+0x7d8/0xfe4 fs/ext4/inode.c:4639

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ei->i_data_sem/3){++++}-{4:4}:
       down_write+0x50/0xc0 kernel/locking/rwsem.c:1590
       ext4_update_i_disksize fs/ext4/ext4.h:3431 [inline]
       ext4_xattr_inode_write fs/ext4/xattr.c:1444 [inline]
       ext4_xattr_inode_lookup_create+0x10cc/0x1768 fs/ext4/xattr.c:1594
       ext4_xattr_ibody_set+0x1b4/0x5fc fs/ext4/xattr.c:2258
       ext4_xattr_set_handle+0xb1c/0x1260 fs/ext4/xattr.c:2435
       ext4_xattr_set+0x1e4/0x2b8 fs/ext4/xattr.c:2549
       ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
       __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200
       __vfs_setxattr_noperm+0x120/0x5c4 fs/xattr.c:234
       __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295
       vfs_setxattr+0x158/0x2ac fs/xattr.c:321
       do_setxattr fs/xattr.c:636 [inline]
       filename_setxattr+0x20c/0x4f8 fs/xattr.c:665
       path_setxattrat+0x2e8/0x320 fs/xattr.c:713
       __do_sys_setxattr fs/xattr.c:747 [inline]
       __se_sys_setxattr fs/xattr.c:743 [inline]
       __arm64_sys_setxattr+0xc0/0xdc fs/xattr.c:743
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
       el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

-> #0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237
       lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
       down_write+0x50/0xc0 kernel/locking/rwsem.c:1590
       inode_lock include/linux/fs.h:869 [inline]
       ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline]
       ext4_xattr_inode_lookup_create+0xc40/0x1768 fs/ext4/xattr.c:1588
       ext4_xattr_block_set+0x1bc/0x24bc fs/ext4/xattr.c:1908
       ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline]
       ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline]
       ext4_expand_extra_isize_ea+0xeb4/0x182c fs/ext4/xattr.c:2822
       __ext4_expand_extra_isize+0x2a0/0x37c fs/ext4/inode.c:6385
       ext4_try_to_expand_extra_isize fs/ext4/inode.c:6428 [inline]
       __ext4_mark_inode_dirty+0x3c0/0x6fc fs/ext4/inode.c:6506
       ext4_ext_truncate+0x94/0x1d0 fs/ext4/extents.c:4475
       ext4_truncate+0x9c8/0xfe4 fs/ext4/inode.c:4643
       ext4_evict_inode+0x9b4/0x104c fs/ext4/inode.c:261
       evict+0x414/0x928 fs/inode.c:810
       iput_final fs/inode.c:1897 [inline]
       iput+0x6e4/0x83c fs/inode.c:1923
       dentry_unlink_inode+0x384/0x45c fs/dcache.c:466
       __dentry_kill+0x170/0x594 fs/dcache.c:669
       dput+0x1b8/0x290 fs/dcache.c:911
       do_renameat2+0x624/0x8c8 fs/namei.c:5280
       __do_sys_renameat2 fs/namei.c:5312 [inline]
       __se_sys_renameat2 fs/namei.c:5309 [inline]
       __arm64_sys_renameat2+0xd8/0xf4 fs/namei.c:5309
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
       el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
       el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ei->i_data_sem/3);
                               lock(&sb->s_type->i_mutex_key#9/1);
                               lock(&ei->i_data_sem/3);
  lock(&sb->s_type->i_mutex_key#9/1);

 *** DEADLOCK ***

7 locks held by syz.0.78/6928:
 #0: ffff0000ce5e6428 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:557
 #1: ffff0000ce5e6738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline]
 #1: ffff0000ce5e6738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x310/0x8c8 fs/namei.c:5224
 #2: ffff0000e7ae76a0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline]
 #2: ffff0000e7ae76a0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x144/0x214 fs/namei.c:3242
 #3: ffff0000f59db3b0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline]
 #3: ffff0000f59db3b0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16c/0x214 fs/namei.c:3243
 #4: ffff0000ce5e6618 (sb_internal){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
 #4: ffff0000ce5e6618 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1798 [inline]
 #4: ffff0000ce5e6618 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1981 [inline]
 #4: ffff0000ce5e6618 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2b0/0x104c fs/ext4/inode.c:215
 #5: ffff0000f59da8b0 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_truncate+0x7d8/0xfe4 fs/ext4/inode.c:4639
 #6: ffff0000f59da708 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline]
 #6: ffff0000f59da708 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6425 [inline]
 #6: ffff0000f59da708 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x358/0x6fc fs/ext4/inode.c:6506

stack backtrace:
CPU: 1 UID: 0 PID: 6928 Comm: syz.0.78 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2043
 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
 down_write+0x50/0xc0 kernel/locking/rwsem.c:1590
 inode_lock include/linux/fs.h:869 [inline]
 ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline]
 ext4_xattr_inode_lookup_create+0xc40/0x1768 fs/ext4/xattr.c:1588
 ext4_xattr_block_set+0x1bc/0x24bc fs/ext4/xattr.c:1908
 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline]
 ext4_expand_extra_isize_ea+0xeb4/0x182c fs/ext4/xattr.c:2822
 __ext4_expand_extra_isize+0x2a0/0x37c fs/ext4/inode.c:6385
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6428 [inline]
 __ext4_mark_inode_dirty+0x3c0/0x6fc fs/ext4/inode.c:6506
 ext4_ext_truncate+0x94/0x1d0 fs/ext4/extents.c:4475
 ext4_truncate+0x9c8/0xfe4 fs/ext4/inode.c:4643
 ext4_evict_inode+0x9b4/0x104c fs/ext4/inode.c:261
 evict+0x414/0x928 fs/inode.c:810
 iput_final fs/inode.c:1897 [inline]
 iput+0x6e4/0x83c fs/inode.c:1923
 dentry_unlink_inode+0x384/0x45c fs/dcache.c:466
 __dentry_kill+0x170/0x594 fs/dcache.c:669
 dput+0x1b8/0x290 fs/dcache.c:911
 do_renameat2+0x624/0x8c8 fs/namei.c:5280
 __do_sys_renameat2 fs/namei.c:5312 [inline]
 __se_sys_renameat2 fs/namei.c:5309 [inline]
 __arm64_sys_renameat2+0xd8/0xf4 fs/namei.c:5309
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596