loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: none.
======================================================
WARNING: possible circular locking dependency detected
6.1.0-syzkaller-13190-g9d2f6060fe4c #0 Not tainted
------------------------------------------------------
syz-executor.0/5542 is trying to acquire lock:
ffff8880754b0ad0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_get+0x103/0x7f0 fs/ext4/xattr.c:665

but task is already holding lock:
ffff8880754b0e08 (&ea_inode->i_rwsem#7/1){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
ffff8880754b0e08 (&ea_inode->i_rwsem#7/1){+.+.}-{3:3}, at: chown_common+0x3db/0x930 fs/open.c:726

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ea_inode->i_rwsem#7/1){+.+.}-{3:3}:
       lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5668
       down_write+0x9c/0x270 kernel/locking/rwsem.c:1562
       inode_lock include/linux/fs.h:756 [inline]
       ext4_xattr_inode_create fs/ext4/xattr.c:1457 [inline]
       ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1540 [inline]
       ext4_xattr_set_entry+0x30f2/0x3a70 fs/ext4/xattr.c:1669
       ext4_xattr_ibody_set+0x128/0x360 fs/ext4/xattr.c:2221
       ext4_xattr_set_handle+0xcd1/0x1680 fs/ext4/xattr.c:2378
       ext4_xattr_set+0x245/0x3d0 fs/ext4/xattr.c:2492
       __vfs_setxattr+0x485/0x4c0 fs/xattr.c:202
       __vfs_setxattr_noperm+0x128/0x5d0 fs/xattr.c:236
       vfs_setxattr+0x228/0x450 fs/xattr.c:323
       do_setxattr fs/xattr.c:608 [inline]
       setxattr fs/xattr.c:631 [inline]
       path_setxattr+0x393/0x4c0 fs/xattr.c:650
       __do_sys_setxattr fs/xattr.c:666 [inline]
       __se_sys_setxattr fs/xattr.c:662 [inline]
       __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:662
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&ei->xattr_sem){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3097 [inline]
       check_prevs_add kernel/locking/lockdep.c:3216 [inline]
       validate_chain+0x184a/0x6470 kernel/locking/lockdep.c:3831
       __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055
       lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5668
       down_read+0x39/0x50 kernel/locking/rwsem.c:1509
       ext4_xattr_get+0x103/0x7f0 fs/ext4/xattr.c:665
       __vfs_getxattr+0x476/0x4b0 fs/xattr.c:425
       cap_inode_need_killpriv+0x41/0x60 security/commoncap.c:301
       security_inode_need_killpriv+0x50/0xb0 security/security.c:1492
       notify_change+0x4d5/0x1100 fs/attr.c:415
       chown_common+0x5d6/0x930 fs/open.c:736
       do_fchownat+0x175/0x250 fs/open.c:767
       __do_sys_fchownat fs/open.c:782 [inline]
       __se_sys_fchownat fs/open.c:779 [inline]
       __x64_sys_fchownat+0xb1/0xc0 fs/open.c:779
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x2b/0x70 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(&ea_inode->i_rwsem#7/1);
                               lock(&ei->xattr_sem);
                               lock(&ea_inode->i_rwsem#7/1);
  lock(&ei->xattr_sem);

 *** DEADLOCK ***

2 locks held by syz-executor.0/5542:
 #0: ffff888029f94460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:508
 #1: ffff8880754b0e08 (&ea_inode->i_rwsem#7/1){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #1: ffff8880754b0e08 (&ea_inode->i_rwsem#7/1){+.+.}-{3:3}, at: chown_common+0x3db/0x930 fs/open.c:726

stack backtrace:
CPU: 1 PID: 5542 Comm: syz-executor.0 Not tainted 6.1.0-syzkaller-13190-g9d2f6060fe4c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 check_noncircular+0x2f9/0x3b0 kernel/locking/lockdep.c:2177
 check_prev_add kernel/locking/lockdep.c:3097 [inline]
 check_prevs_add kernel/locking/lockdep.c:3216 [inline]
 validate_chain+0x184a/0x6470 kernel/locking/lockdep.c:3831
 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055
 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5668
 down_read+0x39/0x50 kernel/locking/rwsem.c:1509
 ext4_xattr_get+0x103/0x7f0 fs/ext4/xattr.c:665
 __vfs_getxattr+0x476/0x4b0 fs/xattr.c:425
 cap_inode_need_killpriv+0x41/0x60 security/commoncap.c:301
 security_inode_need_killpriv+0x50/0xb0 security/security.c:1492
 notify_change+0x4d5/0x1100 fs/attr.c:415
 chown_common+0x5d6/0x930 fs/open.c:736
 do_fchownat+0x175/0x250 fs/open.c:767
 __do_sys_fchownat fs/open.c:782 [inline]
 __se_sys_fchownat fs/open.c:779 [inline]
 __x64_sys_fchownat+0xb1/0xc0 fs/open.c:779
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f6dcda89279
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007f6dcebc3168 EFLAGS: 00000246 ORIG_RAX: 0000000000000104
RAX: ffffffffffffffda RBX: 00007f6dcdb9bf80 RCX: 00007f6dcda89279
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000005
RBP: 00007f6dcdae3189 R08: 0000000000001000 R09: 0000000000000000
R10: 000000000000ee01 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff87ae307f R14: 00007f6dcebc3300 R15: 0000000000022000
 </TASK>