====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc5-syzkaller-00043-gd76bb1ebb558 #0 Not tainted ------------------------------------------------------ syz.6.325/7193 is trying to acquire lock: ffff888058389808 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] ffff888058389808 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline] ffff888058389808 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create+0x17d4/0x1c20 fs/ext4/xattr.c:1588 but task is already holding lock: ffff888059e25208 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_setattr+0x1522/0x1bd0 fs/ext4/inode.c:5564 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->i_data_sem/3){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ext4_update_i_disksize fs/ext4/ext4.h:3402 [inline] ext4_xattr_inode_write fs/ext4/xattr.c:1444 [inline] ext4_xattr_inode_lookup_create+0x14d1/0x1c20 fs/ext4/xattr.c:1594 ext4_xattr_ibody_set+0x202/0x6a0 fs/ext4/xattr.c:2258 ext4_xattr_set_handle+0xc9a/0x1590 fs/ext4/xattr.c:2435 ext4_xattr_set+0x230/0x320 fs/ext4/xattr.c:2549 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x274/0x600 fs/xattr.c:665 path_setxattrat+0x364/0x3a0 fs/xattr.c:713 __do_sys_lsetxattr fs/xattr.c:754 [inline] __se_sys_lsetxattr fs/xattr.c:750 [inline] __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:750 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline] ext4_xattr_inode_lookup_create+0x17d4/0x1c20 fs/ext4/xattr.c:1588 ext4_xattr_block_set+0x223/0x2ac0 fs/ext4/xattr.c:1908 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline] ext4_expand_extra_isize_ea+0x12d5/0x1ea0 fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:5950 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5993 [inline] __ext4_mark_inode_dirty+0x46c/0x700 fs/ext4/inode.c:6071 ext4_setattr+0x1597/0x1bd0 fs/ext4/inode.c:5567 notify_change+0xb36/0xe40 fs/attr.c:552 do_truncate+0x19a/0x220 fs/open.c:65 vfs_truncate+0x493/0x520 fs/open.c:115 do_sys_truncate+0xdb/0x190 fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:148 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 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#9/1); lock(&ei->i_data_sem/3); lock(&sb->s_type->i_mutex_key#9/1); *** DEADLOCK *** 5 locks held by syz.6.325/7193: #0: ffff888029988420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:556 #1: ffff888059e25378 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff888059e25378 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: do_truncate+0x186/0x220 fs/open.c:63 #2: ffff888059e25518 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:912 [inline] #2: ffff888059e25518 (mapping.invalidate_lock#2){++++}-{4:4}, at: ext4_setattr+0xe9d/0x1bd0 fs/ext4/inode.c:5512 #3: ffff888059e25208 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_setattr+0x1522/0x1bd0 fs/ext4/inode.c:5564 #4: ffff888059e25008 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #4: ffff888059e25008 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5990 [inline] #4: ffff888059e25008 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3eb/0x700 fs/ext4/inode.c:6071 stack backtrace: CPU: 0 UID: 0 PID: 7193 Comm: syz.6.325 Not tainted 6.15.0-rc5-syzkaller-00043-gd76bb1ebb558 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline] ext4_xattr_inode_lookup_create+0x17d4/0x1c20 fs/ext4/xattr.c:1588 ext4_xattr_block_set+0x223/0x2ac0 fs/ext4/xattr.c:1908 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline] ext4_expand_extra_isize_ea+0x12d5/0x1ea0 fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:5950 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5993 [inline] __ext4_mark_inode_dirty+0x46c/0x700 fs/ext4/inode.c:6071 ext4_setattr+0x1597/0x1bd0 fs/ext4/inode.c:5567 notify_change+0xb36/0xe40 fs/attr.c:552 do_truncate+0x19a/0x220 fs/open.c:65 vfs_truncate+0x493/0x520 fs/open.c:115 do_sys_truncate+0xdb/0x190 fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:148 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa05b18e969 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:00007fa05c07e038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007fa05b3b6080 RCX: 00007fa05b18e969 RDX: 0000000000000000 RSI: 0000000000008008 RDI: 00002000000000c0 RBP: 00007fa05b210ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fa05b3b6080 R15: 00007fffcbaa5258