EXT4-fs (loop2): mounted filesystem without journal. Quota mode: none. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.1027/9478 is trying to acquire lock: ffff888075389ee0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ffff888075389ee0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_destroy_inline_data+0x24/0xe0 fs/ext4/inline.c:1912 but task is already holding lock: ffff8880605a4b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1c0/0x2e50 fs/ext4/inode.c:2715 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sbi->s_writepages_rwsem){++++}-{0:0}: percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1c0/0x2e50 fs/ext4/inode.c:2715 do_writepages+0x3b7/0x610 mm/page-writeback.c:2491 __writeback_single_inode+0x156/0x1160 fs/fs-writeback.c:1622 writeback_single_inode+0x221/0x8b0 fs/fs-writeback.c:1743 write_inode_now+0x15d/0x1d0 fs/fs-writeback.c:2780 iput_final fs/inode.c:1821 [inline] iput+0x613/0x980 fs/inode.c:1860 ext4_xattr_block_set+0x2736/0x32a0 fs/ext4/xattr.c:2158 ext4_xattr_move_to_block fs/ext4/xattr.c:2626 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2701 [inline] ext4_expand_extra_isize_ea+0x109b/0x19b0 fs/ext4/xattr.c:2793 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5980 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6023 [inline] __ext4_mark_inode_dirty+0x47f/0x770 fs/ext4/inode.c:6101 ext4_evict_inode+0xa73/0x1100 fs/ext4/inode.c:279 evict+0x485/0x870 fs/inode.c:705 ext4_orphan_cleanup+0xbd3/0x1400 fs/ext4/orphan.c:470 __ext4_fill_super fs/ext4/super.c:5530 [inline] ext4_fill_super+0x7bdf/0x8150 fs/ext4/super.c:5661 get_tree_bdev+0x3f1/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ei->xattr_sem){++++}-{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+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_destroy_inline_data+0x24/0xe0 fs/ext4/inline.c:1912 ext4_writepages+0x5df/0x2e50 fs/ext4/inode.c:2761 do_writepages+0x3b7/0x610 mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0x10b/0x1d0 mm/filemap.c:674 filemap_write_and_wait include/linux/pagemap.h:62 [inline] ext4_ioctl_setflags fs/ext4/ioctl.c:637 [inline] ext4_fileattr_set+0x68b/0x16c0 fs/ext4/ioctl.c:1008 vfs_fileattr_set+0x842/0xaf0 fs/ioctl.c:696 ioctl_fssetxattr fs/ioctl.c:758 [inline] do_vfs_ioctl+0x132a/0x1d10 fs/ioctl.c:845 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 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(&sbi->s_writepages_rwsem); lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); lock(&ei->xattr_sem); *** DEADLOCK *** 3 locks held by syz.2.1027/9478: #0: ffff88802402e460 (sb_writers#4){++++}-{0:0}, at: mnt_want_write_file+0x5c/0x200 fs/namespace.c:446 #1: ffff88807538a218 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88807538a218 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_fileattr_set+0x14c/0xaf0 fs/ioctl.c:681 #2: ffff8880605a4b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1c0/0x2e50 fs/ext4/inode.c:2715 stack backtrace: CPU: 0 PID: 9478 Comm: syz.2.1027 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 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+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_destroy_inline_data+0x24/0xe0 fs/ext4/inline.c:1912 ext4_writepages+0x5df/0x2e50 fs/ext4/inode.c:2761 do_writepages+0x3b7/0x610 mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0x10b/0x1d0 mm/filemap.c:674 filemap_write_and_wait include/linux/pagemap.h:62 [inline] ext4_ioctl_setflags fs/ext4/ioctl.c:637 [inline] ext4_fileattr_set+0x68b/0x16c0 fs/ext4/ioctl.c:1008 vfs_fileattr_set+0x842/0xaf0 fs/ioctl.c:696 ioctl_fssetxattr fs/ioctl.c:758 [inline] do_vfs_ioctl+0x132a/0x1d10 fs/ioctl.c:845 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f49d358f749 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:00007f49d4387038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f49d37e5fa0 RCX: 00007f49d358f749 RDX: 00002000000000c0 RSI: 00000000401c5820 RDI: 0000000000000007 RBP: 00007f49d3613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f49d37e6038 R14: 00007f49d37e5fa0 R15: 00007ffd860183e8 EXT4-fs error (device loop2): ext4_mb_generate_buddy:1097: group 0, block bitmap and bg descriptor inconsistent: 25 vs 4278190105 free clusters EXT4-fs (loop2): Delayed block allocation failed for inode 15 at logical offset 0 with max blocks 1 with error 28 EXT4-fs (loop2): This should not happen!! Data will be lost EXT4-fs (loop2): Total free blocks count 0 EXT4-fs (loop2): Free/Dirty block details EXT4-fs (loop2): free_blocks=68451041280 EXT4-fs (loop2): dirty_blocks=16 EXT4-fs (loop2): Block reservation details EXT4-fs (loop2): i_reserved_data_blocks=1