EXT4-fs: Warning: mounting with an experimental mount option 'dioread_nolock' for blocksize < PAGE_SIZE
EXT4-fs (loop2): 1 truncate cleaned up
EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
======================================================
WARNING: possible circular locking dependency detected
6.4.0-rc1-syzkaller-00177-gbb7c241fae62 #0 Not tainted
------------------------------------------------------
syz-executor.2/22743 is trying to acquire lock:
ffff88803e694a00 (&ea_inode->i_rwsem#7/1){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline]
ffff88803e694a00 (&ea_inode->i_rwsem#7/1){+.+.}-{3:3}, at: ext4_xattr_inode_iget+0x4a3/0x5e0 fs/ext4/xattr.c:474

but task is already holding lock:
ffff888081673e88 (&ei->i_data_sem){++++}-{3:3}, at: ext4_setattr+0x14d4/0x1bc0 fs/ext4/inode.c:5399

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ei->i_data_sem){++++}-{3:3}:
       lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5691
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1573
       ext4_update_i_disksize fs/ext4/ext4.h:3306 [inline]
       ext4_xattr_inode_write fs/ext4/xattr.c:1462 [inline]
       ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1611 [inline]
       ext4_xattr_set_entry+0x312d/0x3bf0 fs/ext4/xattr.c:1736
       ext4_xattr_ibody_set+0x121/0x330 fs/ext4/xattr.c:2288
       ext4_xattr_set_handle+0xb9a/0x15c0 fs/ext4/xattr.c:2445
       ext4_xattr_set+0x241/0x3d0 fs/ext4/xattr.c:2559
       __vfs_setxattr+0x460/0x4a0 fs/xattr.c:201
       __vfs_setxattr_noperm+0x12e/0x5e0 fs/xattr.c:235
       vfs_setxattr+0x221/0x420 fs/xattr.c:322
       do_setxattr fs/xattr.c:630 [inline]
       setxattr+0x25d/0x2f0 fs/xattr.c:653
       path_setxattr+0x1c0/0x2a0 fs/xattr.c:672
       __do_sys_setxattr fs/xattr.c:688 [inline]
       __se_sys_setxattr fs/xattr.c:684 [inline]
       __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:684
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&ea_inode->i_rwsem#7/1){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3108 [inline]
       check_prevs_add kernel/locking/lockdep.c:3227 [inline]
       validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3842
       __lock_acquire+0x1295/0x2000 kernel/locking/lockdep.c:5074
       lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5691
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1573
       inode_lock include/linux/fs.h:775 [inline]
       ext4_xattr_inode_iget+0x4a3/0x5e0 fs/ext4/xattr.c:474
       ext4_xattr_inode_get+0x164/0x430 fs/ext4/xattr.c:551
       ext4_xattr_move_to_block fs/ext4/xattr.c:2641 [inline]
       ext4_xattr_make_inode_space fs/ext4/xattr.c:2743 [inline]
       ext4_expand_extra_isize_ea+0xf21/0x1ce0 fs/ext4/xattr.c:2835
       __ext4_expand_extra_isize+0x2f7/0x3d0 fs/ext4/inode.c:5771
       ext4_try_to_expand_extra_isize fs/ext4/inode.c:5814 [inline]
       __ext4_mark_inode_dirty+0x53e/0x870 fs/ext4/inode.c:5892
       ext4_setattr+0x1567/0x1bc0 fs/ext4/inode.c:5402
       notify_change+0xc8b/0xf40 fs/attr.c:483
       do_truncate+0x220/0x300 fs/open.c:66
       handle_truncate fs/namei.c:3295 [inline]
       do_open fs/namei.c:3640 [inline]
       path_openat+0x294e/0x3170 fs/namei.c:3791
       do_filp_open+0x234/0x490 fs/namei.c:3818
       do_sys_openat2+0x13f/0x500 fs/open.c:1356
       do_sys_open fs/open.c:1372 [inline]
       __do_sys_creat fs/open.c:1448 [inline]
       __se_sys_creat fs/open.c:1442 [inline]
       __x64_sys_creat+0x123/0x160 fs/open.c:1442
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ei->i_data_sem);
                               lock(&ea_inode->i_rwsem#7/1);
                               lock(&ei->i_data_sem);
  lock(&ea_inode->i_rwsem#7/1);

 *** DEADLOCK ***

5 locks held by syz-executor.2/22743:
 #0: ffff88809275a460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394
 #1: ffff888081674000 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline]
 #1: ffff888081674000 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: do_truncate+0x20c/0x300 fs/open.c:64
 #2: ffff8880816741a0 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:820 [inline]
 #2: ffff8880816741a0 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_setattr+0xf31/0x1bc0 fs/ext4/inode.c:5359
 #3: ffff888081673e88
 (&ei->i_data_sem){++++}-{3:3}, at: ext4_setattr+0x14d4/0x1bc0 fs/ext4/inode.c:5399
 #4: ffff888081673cc8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline]
 #4: ffff888081673cc8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5811 [inline]
 #4: ffff888081673cc8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x4a5/0x870 fs/ext4/inode.c:5892

stack backtrace:
CPU: 0 PID: 22743 Comm: syz-executor.2 Not tainted 6.4.0-rc1-syzkaller-00177-gbb7c241fae62 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 check_noncircular+0x2fe/0x3b0 kernel/locking/lockdep.c:2188
 check_prev_add kernel/locking/lockdep.c:3108 [inline]
 check_prevs_add kernel/locking/lockdep.c:3227 [inline]
 validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3842
 __lock_acquire+0x1295/0x2000 kernel/locking/lockdep.c:5074
 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5691
 down_write+0x3a/0x50 kernel/locking/rwsem.c:1573
 inode_lock include/linux/fs.h:775 [inline]
 ext4_xattr_inode_iget+0x4a3/0x5e0 fs/ext4/xattr.c:474
 ext4_xattr_inode_get+0x164/0x430 fs/ext4/xattr.c:551
 ext4_xattr_move_to_block fs/ext4/xattr.c:2641 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2743 [inline]
 ext4_expand_extra_isize_ea+0xf21/0x1ce0 fs/ext4/xattr.c:2835
 __ext4_expand_extra_isize+0x2f7/0x3d0 fs/ext4/inode.c:5771
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5814 [inline]
 __ext4_mark_inode_dirty+0x53e/0x870 fs/ext4/inode.c:5892
 ext4_setattr+0x1567/0x1bc0 fs/ext4/inode.c:5402
 notify_change+0xc8b/0xf40 fs/attr.c:483
 do_truncate+0x220/0x300 fs/open.c:66
 handle_truncate fs/namei.c:3295 [inline]
 do_open fs/namei.c:3640 [inline]
 path_openat+0x294e/0x3170 fs/namei.c:3791
 do_filp_open+0x234/0x490 fs/namei.c:3818
 do_sys_openat2+0x13f/0x500 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_creat fs/open.c:1448 [inline]
 __se_sys_creat fs/open.c:1442 [inline]
 __x64_sys_creat+0x123/0x160 fs/open.c:1442
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f9a2548c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9a26151168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f9a255abf80 RCX: 00007f9a2548c169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 00007f9a254e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc1888674f R14: 00007f9a26151300 R15: 0000000000022000
 </TASK>