====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.1886/16717 is trying to acquire lock: ffff888057fbf700 (&sb->s_type->i_mutex_key#12/1){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] ffff888057fbf700 (&sb->s_type->i_mutex_key#12/1){+.+.}-{4:4}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1516 [inline] ffff888057fbf700 (&sb->s_type->i_mutex_key#12/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1598 [inline] ffff888057fbf700 (&sb->s_type->i_mutex_key#12/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create+0x10a2/0x1980 fs/ext4/xattr.c:1576 but task is already holding lock: ffff888063e1b268 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_truncate+0x678/0x1280 fs/ext4/inode.c:4575 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+0x8b/0x1f0 kernel/locking/rwsem.c:1590 ext4_update_i_disksize fs/ext4/ext4.h:3483 [inline] ext4_xattr_inode_write fs/ext4/xattr.c:1454 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1604 [inline] ext4_xattr_inode_lookup_create+0x1297/0x1980 fs/ext4/xattr.c:1576 ext4_xattr_ibody_set+0x1e9/0x5d0 fs/ext4/xattr.c:2268 ext4_xattr_set_handle+0x94f/0x1490 fs/ext4/xattr.c:2445 ext4_xattr_set+0x14b/0x360 fs/ext4/xattr.c:2559 ext4_xattr_user_set+0xbd/0x100 fs/ext4/xattr_user.c:41 __vfs_setxattr+0x175/0x1e0 fs/xattr.c:200 __vfs_setxattr_noperm+0x127/0x660 fs/xattr.c:234 __vfs_setxattr_locked+0x127/0x2b0 fs/xattr.c:295 vfs_setxattr+0x14a/0x390 fs/xattr.c:321 do_setxattr+0x145/0x180 fs/xattr.c:636 filename_setxattr+0x167/0x1d0 fs/xattr.c:664 path_setxattrat+0x1ff/0x3b0 fs/xattr.c:708 __do_sys_setxattr fs/xattr.c:742 [inline] __se_sys_setxattr fs/xattr.c:738 [inline] __x64_sys_setxattr+0xc6/0x140 fs/xattr.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sb->s_type->i_mutex_key#12/1){+.+.}-{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+0x14b8/0x2630 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1590 inode_lock include/linux/fs.h:1028 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1516 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1598 [inline] ext4_xattr_inode_lookup_create+0x10a2/0x1980 fs/ext4/xattr.c:1576 ext4_xattr_block_set+0x2aa/0x3660 fs/ext4/xattr.c:1918 ext4_xattr_move_to_block fs/ext4/xattr.c:2669 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2744 [inline] ext4_expand_extra_isize_ea+0x17c6/0x1d70 fs/ext4/xattr.c:2832 __ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:6342 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6385 [inline] __ext4_mark_inode_dirty+0x693/0x8b0 fs/ext4/inode.c:6463 ext4_ext_truncate+0xa9/0x2f0 fs/ext4/extents.c:4557 ext4_truncate+0xf04/0x1280 fs/ext4/inode.c:4579 ext4_evict_inode+0x8be/0x1990 fs/ext4/inode.c:272 evict+0x3c2/0xad0 fs/inode.c:846 iput_final fs/inode.c:1966 [inline] iput.part.0+0x605/0xf50 fs/inode.c:2015 iput+0x35/0x40 fs/inode.c:1981 filename_unlinkat+0x466/0x730 fs/namei.c:5550 __do_sys_unlink fs/namei.c:5581 [inline] __se_sys_unlink fs/namei.c:5578 [inline] __x64_sys_unlink+0x46/0x70 fs/namei.c:5578 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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#12/1); lock(&ei->i_data_sem/3); lock(&sb->s_type->i_mutex_key#12/1); *** DEADLOCK *** 4 locks held by syz.0.1886/16717: #0: ffff8880268fa420 (sb_writers#4){.+.+}-{0:0}, at: filename_unlinkat+0x1ad/0x730 fs/namei.c:5523 #1: ffff8880268fa610 (sb_internal){.+.+}-{0:0}, at: evict+0x3c2/0xad0 fs/inode.c:846 #2: ffff888063e1b268 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_truncate+0x678/0x1280 fs/ext4/inode.c:4575 #3: ffff888063e1b0c0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #3: ffff888063e1b0c0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6382 [inline] #3: ffff888063e1b0c0 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x606/0x8b0 fs/ext4/inode.c:6463 stack backtrace: CPU: 1 UID: 0 PID: 16717 Comm: syz.0.1886 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043 check_noncircular+0x146/0x160 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+0x14b8/0x2630 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1590 inode_lock include/linux/fs.h:1028 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1516 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1598 [inline] ext4_xattr_inode_lookup_create+0x10a2/0x1980 fs/ext4/xattr.c:1576 ext4_xattr_block_set+0x2aa/0x3660 fs/ext4/xattr.c:1918 ext4_xattr_move_to_block fs/ext4/xattr.c:2669 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2744 [inline] ext4_expand_extra_isize_ea+0x17c6/0x1d70 fs/ext4/xattr.c:2832 __ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:6342 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6385 [inline] __ext4_mark_inode_dirty+0x693/0x8b0 fs/ext4/inode.c:6463 ext4_ext_truncate+0xa9/0x2f0 fs/ext4/extents.c:4557 ext4_truncate+0xf04/0x1280 fs/ext4/inode.c:4579 ext4_evict_inode+0x8be/0x1990 fs/ext4/inode.c:272 evict+0x3c2/0xad0 fs/inode.c:846 iput_final fs/inode.c:1966 [inline] iput.part.0+0x605/0xf50 fs/inode.c:2015 iput+0x35/0x40 fs/inode.c:1981 filename_unlinkat+0x466/0x730 fs/namei.c:5550 __do_sys_unlink fs/namei.c:5581 [inline] __se_sys_unlink fs/namei.c:5578 [inline] __x64_sys_unlink+0x46/0x70 fs/namei.c:5578 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcc73d9c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcc71fd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007fcc74016180 RCX: 00007fcc73d9c819 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000080 RBP: 00007fcc73e32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcc74016218 R14: 00007fcc74016180 R15: 00007ffe4db9edd8