====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 Not tainted ------------------------------------------------------ syz.4.170/7678 is trying to acquire lock: ffff0000f9953fa8 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] ffff0000f9953fa8 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline] ffff0000f9953fa8 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create+0xc40/0x1768 fs/ext4/xattr.c:1588 but task is already holding lock: ffff0000f2184820 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_setattr+0x11c0/0x17ec 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}: down_write+0x50/0xc0 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+0x10cc/0x1768 fs/ext4/xattr.c:1594 ext4_xattr_ibody_set+0x1b4/0x5fc fs/ext4/xattr.c:2258 ext4_xattr_set_handle+0xf34/0x1260 fs/ext4/xattr.c:2435 ext4_xattr_set+0x1e4/0x2b8 fs/ext4/xattr.c:2549 ext4_xattr_security_set+0x4c/0x64 fs/ext4/xattr_security.c:31 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200 __vfs_setxattr_noperm+0x120/0x5c4 fs/xattr.c:234 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295 vfs_setxattr+0x158/0x2ac fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x20c/0x4f8 fs/xattr.c:665 path_setxattrat+0x2e8/0x320 fs/xattr.c:713 __do_sys_lsetxattr fs/xattr.c:754 [inline] __se_sys_lsetxattr fs/xattr.c:750 [inline] __arm64_sys_lsetxattr+0xc0/0xdc fs/xattr.c:750 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #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 kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 down_write+0x50/0xc0 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+0xc40/0x1768 fs/ext4/xattr.c:1588 ext4_xattr_block_set+0x1bc/0x24bc 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+0xeb4/0x182c fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x2a0/0x37c fs/ext4/inode.c:5950 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5993 [inline] __ext4_mark_inode_dirty+0x3c0/0x6fc fs/ext4/inode.c:6071 ext4_setattr+0x121c/0x17ec fs/ext4/inode.c:5567 notify_change+0x9a4/0xc50 fs/attr.c:552 do_truncate+0x178/0x1f0 fs/open.c:65 handle_truncate fs/namei.c:3501 [inline] do_open fs/namei.c:3884 [inline] path_openat+0x25a0/0x2c40 fs/namei.c:4039 do_filp_open+0x18c/0x36c fs/namei.c:4066 do_sys_openat2+0x11c/0x1b4 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1455 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 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.4.170/7678: #0: ffff0000ef604420 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:556 #1: ffff0000f2184990 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff0000f2184990 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: do_truncate+0x164/0x1f0 fs/open.c:63 #2: ffff0000f2184b30 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:912 [inline] #2: ffff0000f2184b30 (mapping.invalidate_lock#2){++++}-{4:4}, at: ext4_setattr+0xc18/0x17ec fs/ext4/inode.c:5512 #3: ffff0000f2184820 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_setattr+0x11c0/0x17ec fs/ext4/inode.c:5564 #4: ffff0000f2184620 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #4: ffff0000f2184620 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5990 [inline] #4: ffff0000f2184620 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x358/0x6fc fs/ext4/inode.c:6071 stack backtrace: CPU: 1 UID: 0 PID: 7678 Comm: syz.4.170 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2079 check_noncircular+0x154/0x174 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 kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 down_write+0x50/0xc0 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+0xc40/0x1768 fs/ext4/xattr.c:1588 ext4_xattr_block_set+0x1bc/0x24bc 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+0xeb4/0x182c fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x2a0/0x37c fs/ext4/inode.c:5950 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5993 [inline] __ext4_mark_inode_dirty+0x3c0/0x6fc fs/ext4/inode.c:6071 ext4_setattr+0x121c/0x17ec fs/ext4/inode.c:5567 notify_change+0x9a4/0xc50 fs/attr.c:552 do_truncate+0x178/0x1f0 fs/open.c:65 handle_truncate fs/namei.c:3501 [inline] do_open fs/namei.c:3884 [inline] path_openat+0x25a0/0x2c40 fs/namei.c:4039 do_filp_open+0x18c/0x36c fs/namei.c:4066 do_sys_openat2+0x11c/0x1b4 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1455 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600