====================================================== WARNING: possible circular locking dependency detected 5.15.178-syzkaller #0 Not tainted ------------------------------------------------------ syz.7.49/5421 is trying to acquire lock: ffff8880576e03f0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] ffff8880576e03f0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1465 [inline] ffff8880576e03f0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1547 [inline] ffff8880576e03f0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: ext4_xattr_set_entry+0x3713/0x4130 fs/ext4/xattr.c:1675 but task is already holding lock: ffff88805771be48 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_truncate+0x974/0x1130 fs/ext4/inode.c:4244 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->i_data_sem/3){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ext4_update_i_disksize fs/ext4/ext4.h:3401 [inline] ext4_xattr_inode_write fs/ext4/xattr.c:1403 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1551 [inline] ext4_xattr_set_entry+0x35e2/0x4130 fs/ext4/xattr.c:1675 ext4_xattr_ibody_set+0x11d/0x330 fs/ext4/xattr.c:2243 ext4_xattr_set_handle+0xc72/0x1560 fs/ext4/xattr.c:2400 ext4_xattr_set+0x26e/0x3d0 fs/ext4/xattr.c:2513 __vfs_setxattr+0x3e7/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 vfs_setxattr+0x21d/0x420 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x27e/0x2e0 fs/xattr.c:611 path_setxattr+0x1bc/0x2a0 fs/xattr.c:630 __do_sys_setxattr fs/xattr.c:646 [inline] __se_sys_setxattr fs/xattr.c:642 [inline] __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:642 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 inode_lock include/linux/fs.h:789 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1465 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1547 [inline] ext4_xattr_set_entry+0x3713/0x4130 fs/ext4/xattr.c:1675 ext4_xattr_block_set+0xb10/0x36a0 fs/ext4/xattr.c:1995 ext4_xattr_move_to_block fs/ext4/xattr.c:2623 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2698 [inline] ext4_expand_extra_isize_ea+0x10d5/0x1bb0 fs/ext4/xattr.c:2790 __ext4_expand_extra_isize+0x2f7/0x3d0 fs/ext4/inode.c:5857 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5900 [inline] __ext4_mark_inode_dirty+0x539/0x860 fs/ext4/inode.c:5978 ext4_ext_truncate+0x9a/0x250 fs/ext4/extents.c:4454 ext4_truncate+0x9fd/0x1130 fs/ext4/inode.c:4249 ext4_evict_inode+0xba1/0x1100 fs/ext4/inode.c:289 evict+0x529/0x930 fs/inode.c:622 __dentry_kill+0x436/0x650 fs/dcache.c:586 dentry_kill+0xbb/0x290 dput+0xd8/0x1a0 fs/dcache.c:893 do_renameat2+0xe1c/0x1700 fs/namei.c:4987 __do_sys_rename fs/namei.c:5031 [inline] __se_sys_rename fs/namei.c:5029 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5029 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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.7.49/5421: #0: ffff888025a4c460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377 #1: ffff888025a4c748 (&type->s_vfs_rename_key){+.+.}-{3:3}, at: lock_rename fs/namei.c:3016 [inline] #1: ffff888025a4c748 (&type->s_vfs_rename_key){+.+.}-{3:3}, at: do_renameat2+0x5b7/0x1700 fs/namei.c:4924 #2: ffff88806f57e7a0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: lock_rename fs/namei.c:3017 [inline] #2: ffff88806f57e7a0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: do_renameat2+0x644/0x1700 fs/namei.c:4924 #3: ffff8880577197e0 (&type->i_mutex_dir_key#4/5){+.+.}-{3:3}, at: do_renameat2+0x67e/0x1700 fs/namei.c:4924 #4: ffff888025a4c650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1813 [inline] #4: ffff888025a4c650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1930 [inline] #4: ffff888025a4c650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x375/0x1100 fs/ext4/inode.c:243 #5: ffff88805771be48 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_truncate+0x974/0x1130 fs/ext4/inode.c:4244 #6: ffff88805771bc98 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] #6: ffff88805771bc98 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5897 [inline] #6: ffff88805771bc98 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x4a0/0x860 fs/ext4/inode.c:5978 stack backtrace: CPU: 0 PID: 5421 Comm: syz.7.49 Not tainted 5.15.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 inode_lock include/linux/fs.h:789 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1465 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1547 [inline] ext4_xattr_set_entry+0x3713/0x4130 fs/ext4/xattr.c:1675 ext4_xattr_block_set+0xb10/0x36a0 fs/ext4/xattr.c:1995 ext4_xattr_move_to_block fs/ext4/xattr.c:2623 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2698 [inline] ext4_expand_extra_isize_ea+0x10d5/0x1bb0 fs/ext4/xattr.c:2790 __ext4_expand_extra_isize+0x2f7/0x3d0 fs/ext4/inode.c:5857 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5900 [inline] __ext4_mark_inode_dirty+0x539/0x860 fs/ext4/inode.c:5978 ext4_ext_truncate+0x9a/0x250 fs/ext4/extents.c:4454 ext4_truncate+0x9fd/0x1130 fs/ext4/inode.c:4249 ext4_evict_inode+0xba1/0x1100 fs/ext4/inode.c:289 evict+0x529/0x930 fs/inode.c:622 __dentry_kill+0x436/0x650 fs/dcache.c:586 dentry_kill+0xbb/0x290 dput+0xd8/0x1a0 fs/dcache.c:893 do_renameat2+0xe1c/0x1700 fs/namei.c:4987 __do_sys_rename fs/namei.c:5031 [inline] __se_sys_rename fs/namei.c:5029 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5029 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f2c8baf8de9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2c8ad49038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007f2c8bd12080 RCX: 00007f2c8baf8de9 RDX: 0000000000000000 RSI: 00004000000000c0 RDI: 0000400000000000 RBP: 00007f2c8bb7a2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f2c8bd12080 R15: 00007fff5fd6b978