====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.1140/11790 is trying to acquire lock: ffff88802c6c8c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2571 but task is already holding lock: ffff88807676c260 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] ffff88807676c260 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6526 [inline] ffff88807676c260 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x5db/0x880 fs/ext4/inode.c:6607 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->xattr_sem){++++}-{4:4}: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1631 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_destroy_inline_data+0x2d/0xe0 fs/ext4/inline.c:1805 ext4_do_writepages+0x1185/0x3ed0 fs/ext4/inode.c:2828 ext4_writepages+0x347/0x750 fs/ext4/inode.c:3043 do_writepages+0x278/0x600 mm/page-writeback.c:2571 filemap_writeback+0x22d/0x2e0 mm/filemap.c:387 filemap_fdatawrite_range mm/filemap.c:412 [inline] file_write_and_wait_range+0xcd/0x140 mm/filemap.c:786 mmb_fsync_noflush+0x7a/0x2b0 fs/buffer.c:652 ext4_fsync_nojournal.constprop.0+0xe6/0x420 fs/ext4/fsync.c:92 ext4_sync_file+0x868/0xb60 fs/ext4/fsync.c:160 vfs_fsync_range fs/sync.c:186 [inline] vfs_fsync fs/sync.c:200 [inline] do_fsync+0xbf/0x220 fs/sync.c:211 __do_sys_fdatasync fs/sync.c:221 [inline] __se_sys_fdatasync fs/sync.c:219 [inline] __x64_sys_fdatasync+0x35/0x50 fs/sync.c:219 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}: check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165 check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1876 [inline] ext4_writepages+0x21d/0x750 fs/ext4/inode.c:3042 do_writepages+0x278/0x600 mm/page-writeback.c:2571 __writeback_single_inode+0x164/0x1300 fs/fs-writeback.c:1787 writeback_single_inode+0x51c/0xfc0 fs/fs-writeback.c:1906 write_inode_now+0x174/0x1f0 fs/fs-writeback.c:3060 iput_final fs/inode.c:2009 [inline] iput.part.0+0x62a/0x1050 fs/inode.c:2068 iput+0x35/0x40 fs/inode.c:2034 ext4_xattr_block_set+0x6f7/0x3660 fs/ext4/xattr.c:2206 ext4_xattr_move_to_block fs/ext4/xattr.c:2671 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2746 [inline] ext4_expand_extra_isize_ea+0x17c6/0x1d70 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:6486 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6529 [inline] __ext4_mark_inode_dirty+0x668/0x880 fs/ext4/inode.c:6607 ext4_evict_inode+0x835/0x1960 fs/ext4/inode.c:267 evict+0x3c2/0xad0 fs/inode.c:825 iput_final fs/inode.c:2019 [inline] iput.part.0+0x989/0x1050 fs/inode.c:2068 iput+0x35/0x40 fs/inode.c:2034 ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5705 [inline] ext4_fill_super+0x917f/0xb470 fs/ext4/super.c:5828 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1634 vfs_get_tree+0x92/0x320 fs/super.c:1694 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3765 [inline] do_new_mount fs/namespace.c:3841 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4161 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount fs/namespace.c:4367 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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); rlock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.3.1140/11790: #0: ffff888035ea80d8 (&type->s_umount_key#28/1){+.+.}-{4:4}, at: alloc_super fs/super.c:345 [inline] #0: ffff888035ea80d8 (&type->s_umount_key#28/1){+.+.}-{4:4}, at: sget_fc+0x3c8/0x1d80 fs/super.c:766 #1: ffff888035ea8640 (sb_internal){.+.+}-{0:0}, at: evict+0x3c2/0xad0 fs/inode.c:825 #2: ffff88807676c260 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #2: ffff88807676c260 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6526 [inline] #2: ffff88807676c260 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x5db/0x880 fs/ext4/inode.c:6607 stack backtrace: CPU: 0 UID: 0 PID: 11790 Comm: syz.3.1140 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175 check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165 check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1876 [inline] ext4_writepages+0x21d/0x750 fs/ext4/inode.c:3042 do_writepages+0x278/0x600 mm/page-writeback.c:2571 __writeback_single_inode+0x164/0x1300 fs/fs-writeback.c:1787 writeback_single_inode+0x51c/0xfc0 fs/fs-writeback.c:1906 write_inode_now+0x174/0x1f0 fs/fs-writeback.c:3060 iput_final fs/inode.c:2009 [inline] iput.part.0+0x62a/0x1050 fs/inode.c:2068 iput+0x35/0x40 fs/inode.c:2034 ext4_xattr_block_set+0x6f7/0x3660 fs/ext4/xattr.c:2206 ext4_xattr_move_to_block fs/ext4/xattr.c:2671 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2746 [inline] ext4_expand_extra_isize_ea+0x17c6/0x1d70 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:6486 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6529 [inline] __ext4_mark_inode_dirty+0x668/0x880 fs/ext4/inode.c:6607 ext4_evict_inode+0x835/0x1960 fs/ext4/inode.c:267 evict+0x3c2/0xad0 fs/inode.c:825 iput_final fs/inode.c:2019 [inline] iput.part.0+0x989/0x1050 fs/inode.c:2068 iput+0x35/0x40 fs/inode.c:2034 ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5705 [inline] ext4_fill_super+0x917f/0xb470 fs/ext4/super.c:5828 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1634 vfs_get_tree+0x92/0x320 fs/super.c:1694 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3765 [inline] do_new_mount fs/namespace.c:3841 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4161 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount fs/namespace.c:4367 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2caa59e0ca 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:00007f2cab43be58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2cab43bee0 RCX: 00007f2caa59e0ca RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f2cab43bea0 RBP: 0000200000000180 R08: 00007f2cab43bee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007f2cab43bea0 R14: 000000000000047a R15: 000000000000002c EXT4-fs error (device loop3): ext4_xattr_inode_iget:441: inode #11: comm syz.3.1140: iget: bad extra_isize 90 (inode size 256) loop3: lost file I/O error report for ino 11 type 5 pos 0x0 len 0x0 error -117 EXT4-fs (loop3): Remounting filesystem read-only EXT4-fs warning (device loop3): ext4_evict_inode:269: couldn't mark inode dirty (err -30) EXT4-fs (loop3): 1 orphan inode deleted EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.