loop1: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.2502/17624 is trying to acquire lock: ffff8880651b4c18 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x213/0x2e70 fs/ext4/inode.c:2717 but task is already holding lock: ffff88807f32d108 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] ffff88807f32d108 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6043 [inline] ffff88807f32d108 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3f6/0x760 fs/ext4/inode.c:6124 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->xattr_sem){++++}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline] ext4_destroy_inline_data+0x24/0xe0 fs/ext4/inline.c:1930 ext4_writepages+0x599/0x2e70 fs/ext4/inode.c:2763 do_writepages+0x3c6/0x640 mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] __filemap_fdatawrite mm/filemap.c:427 [inline] filemap_flush+0xe0/0x140 mm/filemap.c:454 ext4_release_file+0x7e/0x300 fs/ext4/file.c:158 __fput+0x20a/0x8b0 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x9d5/0x2570 kernel/exit.c:881 do_group_exit+0x229/0x2e0 kernel/exit.c:1024 get_signal+0x1259/0x1340 kernel/signal.c:2872 arch_do_signal_or_restart+0xc4/0x1310 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:316 exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1485 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 -> #0 (&sbi->s_writepages_rwsem){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 ext4_writepages+0x213/0x2e70 fs/ext4/inode.c:2717 do_writepages+0x3c6/0x640 mm/page-writeback.c:2491 __writeback_single_inode+0x153/0x1170 fs/fs-writeback.c:1622 writeback_single_inode+0x3d2/0x8e0 fs/fs-writeback.c:1743 write_inode_now+0x17f/0x210 fs/fs-writeback.c:2786 iput_final fs/inode.c:1821 [inline] iput+0x643/0x9c0 fs/inode.c:1860 ext4_xattr_block_set+0x2487/0x2fe0 fs/ext4/xattr.c:2148 ext4_xattr_move_to_block fs/ext4/xattr.c:2613 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2688 [inline] ext4_expand_extra_isize_ea+0xfca/0x1d40 fs/ext4/xattr.c:2776 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:6003 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6046 [inline] __ext4_mark_inode_dirty+0x478/0x760 fs/ext4/inode.c:6124 ext4_evict_inode+0xa67/0x10e0 fs/ext4/inode.c:281 evict+0x4b6/0x8b0 fs/inode.c:705 ext4_orphan_cleanup+0xc32/0x1470 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5574 [inline] ext4_fill_super+0x6f0c/0x78f0 fs/ext4/super.c:5693 get_tree_bdev+0x3e6/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.1.2502/17624: #0: ffff8880651b20e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x1fb/0x930 fs/super.c:228 #1: ffff8880651b2650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1891 [inline] #1: ffff8880651b2650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2013 [inline] #1: ffff8880651b2650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x431/0x10e0 fs/ext4/inode.c:242 #2: ffff88807f32d108 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] #2: ffff88807f32d108 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6043 [inline] #2: ffff88807f32d108 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3f6/0x760 fs/ext4/inode.c:6124 stack backtrace: CPU: 1 PID: 17624 Comm: syz.1.2502 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 ext4_writepages+0x213/0x2e70 fs/ext4/inode.c:2717 do_writepages+0x3c6/0x640 mm/page-writeback.c:2491 __writeback_single_inode+0x153/0x1170 fs/fs-writeback.c:1622 writeback_single_inode+0x3d2/0x8e0 fs/fs-writeback.c:1743 write_inode_now+0x17f/0x210 fs/fs-writeback.c:2786 iput_final fs/inode.c:1821 [inline] iput+0x643/0x9c0 fs/inode.c:1860 ext4_xattr_block_set+0x2487/0x2fe0 fs/ext4/xattr.c:2148 ext4_xattr_move_to_block fs/ext4/xattr.c:2613 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2688 [inline] ext4_expand_extra_isize_ea+0xfca/0x1d40 fs/ext4/xattr.c:2776 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:6003 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6046 [inline] __ext4_mark_inode_dirty+0x478/0x760 fs/ext4/inode.c:6124 ext4_evict_inode+0xa67/0x10e0 fs/ext4/inode.c:281 evict+0x4b6/0x8b0 fs/inode.c:705 ext4_orphan_cleanup+0xc32/0x1470 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5574 [inline] ext4_fill_super+0x6f0c/0x78f0 fs/ext4/super.c:5693 get_tree_bdev+0x3e6/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3bf299f10a Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f3bf3797e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f3bf3797ee0 RCX: 00007f3bf299f10a RDX: 0000200000000240 RSI: 0000200000000000 RDI: 00007f3bf3797ea0 RBP: 0000200000000240 R08: 00007f3bf3797ee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007f3bf3797ea0 R14: 000000000000047a R15: 000000000000002c EXT4-fs error (device loop1): ext4_xattr_inode_iget:401: inode #11: comm syz.1.2502: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop1): Remounting filesystem read-only EXT4-fs error (device loop1): ext4_xattr_inode_iget:406: comm syz.1.2502: error while reading EA inode 11 err=-117 EXT4-fs (loop1): Remounting filesystem read-only EXT4-fs error (device loop1): ext4_xattr_inode_iget:401: inode #11: comm syz.1.2502: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop1): Remounting filesystem read-only EXT4-fs error (device loop1): ext4_xattr_inode_iget:406: comm syz.1.2502: error while reading EA inode 11 err=-117 EXT4-fs (loop1): Remounting filesystem read-only EXT4-fs error (device loop1): ext4_xattr_inode_iget:401: inode #18: comm syz.1.2502: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop1): Remounting filesystem read-only EXT4-fs error (device loop1): ext4_xattr_inode_iget:406: comm syz.1.2502: error while reading EA inode 18 err=-117 EXT4-fs (loop1): Remounting filesystem read-only EXT4-fs error (device loop1): ext4_xattr_inode_iget:401: inode #18: comm syz.1.2502: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop1): Remounting filesystem read-only EXT4-fs error (device loop1): ext4_xattr_inode_iget:406: comm syz.1.2502: error while reading EA inode 18 err=-117 EXT4-fs (loop1): Remounting filesystem read-only EXT4-fs (loop1): 1 orphan inode deleted EXT4-fs (loop1): mounted filesystem without journal. Quota mode: none. EXT4-fs error (device loop1): __ext4_iget:5102: inode #14: block 1886221359: comm syz.1.2502: invalid block EXT4-fs (loop1): Remounting filesystem read-only