loop0: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.840/10143 is trying to acquire lock: ffff00010f218c18 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1b0/0x28fc fs/ext4/inode.c:2717 but task is already holding lock: ffff0000f00600c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] ffff0000f00600c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6043 [inline] ffff0000f00600c8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x36c/0x7b4 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+0x5c/0x88 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline] ext4_destroy_inline_data+0x30/0x114 fs/ext4/inline.c:1930 ext4_writepages+0x42c/0x28fc fs/ext4/inode.c:2763 do_writepages+0x2c4/0x50c mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x124/0x174 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] file_write_and_wait_range+0x11c/0x1f4 mm/filemap.c:774 ext4_sync_file+0x20c/0xc84 fs/ext4/fsync.c:151 vfs_fsync_range+0x168/0x188 fs/sync.c:188 generic_write_sync include/linux/fs.h:2962 [inline] ext4_buffered_write_iter+0x474/0x520 fs/ext4/file.c:292 ext4_file_write_iter+0x188/0x1500 fs/ext4/file.c:-1 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x520/0x93c fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_pwritev+0x1e8/0x338 fs/read_write.c:1031 __do_sys_pwritev2 fs/read_write.c:1090 [inline] __se_sys_pwritev2 fs/read_write.c:1081 [inline] __arm64_sys_pwritev2+0xdc/0x110 fs/read_write.c:1081 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 (&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+0x2808/0x6634 kernel/locking/lockdep.c:5063 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 percpu_down_read+0x70/0x2a8 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1b0/0x28fc fs/ext4/inode.c:2717 do_writepages+0x2c4/0x50c mm/page-writeback.c:2491 __writeback_single_inode+0x164/0x157c fs/fs-writeback.c:1622 writeback_single_inode+0x1cc/0x73c fs/fs-writeback.c:1743 write_inode_now+0x150/0x1cc fs/fs-writeback.c:2786 iput_final fs/inode.c:1821 [inline] iput+0x5b8/0x7e8 fs/inode.c:1860 ext4_xattr_block_set+0x1474/0x28b4 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+0xea4/0x1818 fs/ext4/xattr.c:2776 __ext4_expand_extra_isize+0x2a0/0x364 fs/ext4/inode.c:6003 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6046 [inline] __ext4_mark_inode_dirty+0x3d4/0x7b4 fs/ext4/inode.c:6124 ext4_evict_inode+0xb50/0x1264 fs/ext4/inode.c:281 evict+0x3d8/0x824 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x728/0x7e8 fs/inode.c:1860 ext4_process_orphan+0x24c/0x2c0 fs/ext4/orphan.c:358 ext4_orphan_cleanup+0x964/0x1090 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5574 [inline] ext4_fill_super+0x5af8/0x63bc fs/ext4/super.c:5693 get_tree_bdev+0x35c/0x54c fs/super.c:1366 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5723 vfs_get_tree+0x90/0x278 fs/super.c:1573 do_new_mount+0x228/0x804 fs/namespace.c:3078 path_mount+0x5ac/0xe6c fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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->xattr_sem); lock(&sbi->s_writepages_rwsem); lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.0.840/10143: #0: ffff0000ebae20e0 (&type->s_umount_key#26/1){+.+.}-{3:3}, at: alloc_super+0x1a0/0x840 fs/super.c:228 #1: ffff0000ebae2650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1891 [inline] #1: ffff0000ebae2650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2013 [inline] #1: ffff0000ebae2650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x3e0/0x1264 fs/ext4/inode.c:242 #2: ffff0000f00600c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] #2: ffff0000f00600c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6043 [inline] #2: ffff0000f00600c8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x36c/0x7b4 fs/ext4/inode.c:6124 stack backtrace: CPU: 0 PID: 10143 Comm: syz.0.840 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 Call trace: dump_backtrace+0x1c4/0x1f0 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+0xf4/0x15c 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+0x264/0x2f8 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+0x2808/0x6634 kernel/locking/lockdep.c:5063 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 percpu_down_read+0x70/0x2a8 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1b0/0x28fc fs/ext4/inode.c:2717 do_writepages+0x2c4/0x50c mm/page-writeback.c:2491 __writeback_single_inode+0x164/0x157c fs/fs-writeback.c:1622 writeback_single_inode+0x1cc/0x73c fs/fs-writeback.c:1743 write_inode_now+0x150/0x1cc fs/fs-writeback.c:2786 iput_final fs/inode.c:1821 [inline] iput+0x5b8/0x7e8 fs/inode.c:1860 ext4_xattr_block_set+0x1474/0x28b4 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+0xea4/0x1818 fs/ext4/xattr.c:2776 __ext4_expand_extra_isize+0x2a0/0x364 fs/ext4/inode.c:6003 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6046 [inline] __ext4_mark_inode_dirty+0x3d4/0x7b4 fs/ext4/inode.c:6124 ext4_evict_inode+0xb50/0x1264 fs/ext4/inode.c:281 evict+0x3d8/0x824 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x728/0x7e8 fs/inode.c:1860 ext4_process_orphan+0x24c/0x2c0 fs/ext4/orphan.c:358 ext4_orphan_cleanup+0x964/0x1090 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5574 [inline] ext4_fill_super+0x5af8/0x63bc fs/ext4/super.c:5693 get_tree_bdev+0x35c/0x54c fs/super.c:1366 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5723 vfs_get_tree+0x90/0x278 fs/super.c:1573 do_new_mount+0x228/0x804 fs/namespace.c:3078 path_mount+0x5ac/0xe6c fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 EXT4-fs error (device loop0): ext4_xattr_inode_iget:401: inode #11: comm syz.0.840: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): ext4_xattr_inode_iget:406: comm syz.0.840: error while reading EA inode 11 err=-117 EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): ext4_xattr_inode_iget:401: inode #11: comm syz.0.840: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): ext4_xattr_inode_iget:406: comm syz.0.840: error while reading EA inode 11 err=-117 EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): ext4_xattr_inode_iget:401: inode #18: comm syz.0.840: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): ext4_xattr_inode_iget:406: comm syz.0.840: error while reading EA inode 18 err=-117 EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): ext4_xattr_inode_iget:401: inode #18: comm syz.0.840: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): ext4_xattr_inode_iget:406: comm syz.0.840: error while reading EA inode 18 err=-117 EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs (loop0): 1 orphan inode deleted EXT4-fs (loop0): mounted filesystem without journal. Quota mode: none.