====================================================== WARNING: possible circular locking dependency detected 6.1.143-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.958/8264 is trying to acquire lock: ffff0000f62b2c20 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] ffff0000f62b2c20 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1474 [inline] ffff0000f62b2c20 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: ext4_xattr_inode_lookup_create+0x126c/0x18c4 fs/ext4/xattr.c:1556 but task is already holding lock: ffff0000f6370288 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_map_blocks+0x7c4/0x1770 fs/ext4/inode.c:672 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+0x5c/0x88 kernel/locking/rwsem.c:1573 ext4_update_i_disksize fs/ext4/ext4.h:3385 [inline] ext4_xattr_inode_write fs/ext4/xattr.c:1412 [inline] ext4_xattr_inode_lookup_create+0x1198/0x18c4 fs/ext4/xattr.c:1562 ext4_xattr_ibody_set+0x1b4/0x600 fs/ext4/xattr.c:2224 ext4_xattr_set_handle+0x900/0x102c fs/ext4/xattr.c:2401 ext4_xattr_set+0x1e0/0x2b4 fs/ext4/xattr.c:2515 ext4_xattr_security_set+0x4c/0x64 fs/ext4/xattr_security.c:31 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x228/0x28c fs/xattr.c:617 path_setxattr+0x12c/0x25c fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:648 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1474 [inline] ext4_xattr_inode_lookup_create+0x126c/0x18c4 fs/ext4/xattr.c:1556 ext4_xattr_block_set+0x1b4/0x2810 fs/ext4/xattr.c:1876 ext4_xattr_move_to_block fs/ext4/xattr.c:2625 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2700 [inline] ext4_expand_extra_isize_ea+0xcb8/0x15cc fs/ext4/xattr.c:2792 __ext4_expand_extra_isize+0x298/0x358 fs/ext4/inode.c:5966 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6009 [inline] __ext4_mark_inode_dirty+0x3e4/0x790 fs/ext4/inode.c:6087 ext4_dirty_inode+0xd0/0x100 fs/ext4/inode.c:6119 __mark_inode_dirty+0x2e8/0x12a0 fs/fs-writeback.c:2433 mark_inode_dirty include/linux/fs.h:2546 [inline] dquot_alloc_space include/linux/quotaops.h:320 [inline] dquot_alloc_block include/linux/quotaops.h:337 [inline] ext4_mb_new_blocks+0x23e0/0x435c fs/ext4/mballoc.c:5727 ext4_new_meta_blocks+0x134/0x32c fs/ext4/balloc.c:739 ext4_alloc_branch fs/ext4/indirect.c:342 [inline] ext4_ind_map_blocks+0xc4c/0x1c50 fs/ext4/indirect.c:635 ext4_map_blocks+0x80c/0x1770 fs/ext4/inode.c:681 _ext4_get_block+0x194/0x4c8 fs/ext4/inode.c:822 ext4_get_block+0x4c/0x60 fs/ext4/inode.c:839 ext4_block_write_begin+0x508/0x10f8 fs/ext4/inode.c:1124 ext4_write_begin+0x5ec/0x133c fs/ext4/ext4_jbd2.h:-1 generic_perform_write+0x230/0x4b0 mm/filemap.c:3846 ext4_buffered_write_iter+0x2c4/0x530 fs/ext4/file.c:285 ext4_file_write_iter+0x188/0x152c fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ac/0x7c4 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __arm64_sys_pwrite64+0x170/0x200 fs/read_write.c:706 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 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 *** 4 locks held by syz.2.958/8264: #0: ffff0000d9946460 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x23c/0x7c4 fs/read_write.c:580 #1: ffff0000f6370400 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff0000f6370400 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0x98/0x530 fs/ext4/file.c:279 #2: ffff0000f6370288 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_map_blocks+0x7c4/0x1770 fs/ext4/inode.c:672 #3: ffff0000f63700c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] #3: ffff0000f63700c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6006 [inline] #3: ffff0000f63700c8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x37c/0x790 fs/ext4/inode.c:6087 stack backtrace: CPU: 1 PID: 8264 Comm: syz.2.958 Not tainted 6.1.143-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1474 [inline] ext4_xattr_inode_lookup_create+0x126c/0x18c4 fs/ext4/xattr.c:1556 ext4_xattr_block_set+0x1b4/0x2810 fs/ext4/xattr.c:1876 ext4_xattr_move_to_block fs/ext4/xattr.c:2625 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2700 [inline] ext4_expand_extra_isize_ea+0xcb8/0x15cc fs/ext4/xattr.c:2792 __ext4_expand_extra_isize+0x298/0x358 fs/ext4/inode.c:5966 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6009 [inline] __ext4_mark_inode_dirty+0x3e4/0x790 fs/ext4/inode.c:6087 ext4_dirty_inode+0xd0/0x100 fs/ext4/inode.c:6119 __mark_inode_dirty+0x2e8/0x12a0 fs/fs-writeback.c:2433 mark_inode_dirty include/linux/fs.h:2546 [inline] dquot_alloc_space include/linux/quotaops.h:320 [inline] dquot_alloc_block include/linux/quotaops.h:337 [inline] ext4_mb_new_blocks+0x23e0/0x435c fs/ext4/mballoc.c:5727 ext4_new_meta_blocks+0x134/0x32c fs/ext4/balloc.c:739 ext4_alloc_branch fs/ext4/indirect.c:342 [inline] ext4_ind_map_blocks+0xc4c/0x1c50 fs/ext4/indirect.c:635 ext4_map_blocks+0x80c/0x1770 fs/ext4/inode.c:681 _ext4_get_block+0x194/0x4c8 fs/ext4/inode.c:822 ext4_get_block+0x4c/0x60 fs/ext4/inode.c:839 ext4_block_write_begin+0x508/0x10f8 fs/ext4/inode.c:1124 ext4_write_begin+0x5ec/0x133c fs/ext4/ext4_jbd2.h:-1 generic_perform_write+0x230/0x4b0 mm/filemap.c:3846 ext4_buffered_write_iter+0x2c4/0x530 fs/ext4/file.c:285 ext4_file_write_iter+0x188/0x152c fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ac/0x7c4 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __arm64_sys_pwrite64+0x170/0x200 fs/read_write.c:706 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585