====================================================== WARNING: possible circular locking dependency detected 6.6.98-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.1902/14534 is trying to acquire lock: ffff888077da6810 (&sb->s_type->i_mutex_key#8/1){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] ffff888077da6810 (&sb->s_type->i_mutex_key#8/1){+.+.}-{3:3}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1523 [inline] ffff888077da6810 (&sb->s_type->i_mutex_key#8/1){+.+.}-{3:3}, at: ext4_xattr_inode_lookup_create+0x1917/0x1d80 fs/ext4/xattr.c:1605 but task is already holding lock: ffff888077da7088 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x15fa/0x1c90 fs/ext4/inode.c:5581 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->i_data_sem/3){++++}-{3:3}: down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 ext4_update_i_disksize fs/ext4/ext4.h:3382 [inline] ext4_xattr_inode_write fs/ext4/xattr.c:1461 [inline] ext4_xattr_inode_lookup_create+0x15fe/0x1d80 fs/ext4/xattr.c:1611 ext4_xattr_ibody_set+0x202/0x6a0 fs/ext4/xattr.c:2273 ext4_xattr_set_handle+0xaad/0x1290 fs/ext4/xattr.c:2450 ext4_xattr_set+0x22d/0x320 fs/ext4/xattr.c:2564 __vfs_setxattr+0x431/0x470 fs/xattr.c:201 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322 do_setxattr fs/xattr.c:630 [inline] path_setxattr+0x362/0x550 fs/xattr.c:659 __do_sys_setxattr fs/xattr.c:677 [inline] __se_sys_setxattr fs/xattr.c:673 [inline] __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&sb->s_type->i_mutex_key#8/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1523 [inline] ext4_xattr_inode_lookup_create+0x1917/0x1d80 fs/ext4/xattr.c:1605 ext4_xattr_block_set+0x23e/0x32a0 fs/ext4/xattr.c:1925 ext4_xattr_move_to_block fs/ext4/xattr.c:2674 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2749 [inline] ext4_expand_extra_isize_ea+0x10ea/0x19e0 fs/ext4/xattr.c:2841 __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5953 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5996 [inline] __ext4_mark_inode_dirty+0x45d/0x6e0 fs/ext4/inode.c:6074 ext4_setattr+0x1673/0x1c90 fs/ext4/inode.c:5584 notify_change+0xb0d/0xe10 fs/attr.c:499 do_truncate+0x19b/0x220 fs/open.c:66 vfs_truncate+0x266/0x300 fs/open.c:112 do_sys_truncate+0xe0/0x1a0 fs/open.c:135 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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#8/1); lock(&ei->i_data_sem/3); lock(&sb->s_type->i_mutex_key#8/1); *** DEADLOCK *** 5 locks held by syz.2.1902/14534: #0: ffff88805b430418 (sb_writers#4){++++}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:403 #1: ffff888077da7210 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff888077da7210 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: do_truncate+0x187/0x220 fs/open.c:64 #2: ffff888077da73a0 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:849 [inline] #2: ffff888077da73a0 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_setattr+0xef3/0x1c90 fs/ext4/inode.c:5529 #3: ffff888077da7088 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x15fa/0x1c90 fs/ext4/inode.c:5581 #4: ffff888077da6ec8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] #4: ffff888077da6ec8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5993 [inline] #4: ffff888077da6ec8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3dc/0x6e0 fs/ext4/inode.c:6074 stack backtrace: CPU: 0 PID: 14534 Comm: syz.2.1902 Not tainted 6.6.98-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1523 [inline] ext4_xattr_inode_lookup_create+0x1917/0x1d80 fs/ext4/xattr.c:1605 ext4_xattr_block_set+0x23e/0x32a0 fs/ext4/xattr.c:1925 ext4_xattr_move_to_block fs/ext4/xattr.c:2674 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2749 [inline] ext4_expand_extra_isize_ea+0x10ea/0x19e0 fs/ext4/xattr.c:2841 __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5953 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5996 [inline] __ext4_mark_inode_dirty+0x45d/0x6e0 fs/ext4/inode.c:6074 ext4_setattr+0x1673/0x1c90 fs/ext4/inode.c:5584 notify_change+0xb0d/0xe10 fs/attr.c:499 do_truncate+0x19b/0x220 fs/open.c:66 vfs_truncate+0x266/0x300 fs/open.c:112 do_sys_truncate+0xe0/0x1a0 fs/open.c:135 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f84db58e929 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:00007f84dc365038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f84db7b6160 RCX: 00007f84db58e929 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000200000000100 RBP: 00007f84db610b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f84db7b6160 R15: 00007ffc782cf048