====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.2302/18998 is trying to acquire lock: ffff888059c1cc18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2575 but task is already holding lock: ffff888078c31380 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] ffff888078c31380 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6474 [inline] ffff888078c31380 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x5f0/0x890 fs/ext4/inode.c:6555 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->xattr_sem){++++}-{4:4}: down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1625 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_destroy_inline_data+0x2d/0xe0 fs/ext4/inline.c:1805 ext4_do_writepages+0x118b/0x3f20 fs/ext4/inode.c:2827 ext4_writepages+0x347/0x790 fs/ext4/inode.c:3042 do_writepages+0x278/0x600 mm/page-writeback.c:2575 filemap_writeback+0x22d/0x2e0 mm/filemap.c:388 generic_fadvise+0x595/0x760 mm/fadvise.c:114 vfs_fadvise mm/fadvise.c:184 [inline] ksys_fadvise64_64+0xf4/0x130 mm/fadvise.c:197 __x64_sys_fadvise64+0x96/0x100 mm/fadvise.c:207 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b1/0x370 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:1811 [inline] ext4_writepages+0x21d/0x790 fs/ext4/inode.c:3041 do_writepages+0x278/0x600 mm/page-writeback.c:2575 __writeback_single_inode+0x164/0x1350 fs/fs-writeback.c:1762 writeback_single_inode+0x4d3/0xf30 fs/fs-writeback.c:1881 write_inode_now+0x174/0x1f0 fs/fs-writeback.c:2972 iput_final fs/inode.c:1950 [inline] iput.part.0+0x7f3/0xf50 fs/inode.c:2009 iput+0x35/0x40 fs/inode.c:1975 ext4_xattr_block_set+0x1426/0x3660 fs/ext4/xattr.c:2153 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:6434 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6477 [inline] __ext4_mark_inode_dirty+0x67d/0x890 fs/ext4/inode.c:6555 ext4_evict_inode+0x846/0x1a30 fs/ext4/inode.c:267 evict+0x3c2/0xad0 fs/inode.c:841 iput_final fs/inode.c:1960 [inline] iput.part.0+0x605/0xf50 fs/inode.c:2009 iput+0x35/0x40 fs/inode.c:1975 ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5701 [inline] ext4_fill_super+0x916c/0xb5d0 fs/ext4/super.c:5824 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1694 vfs_get_tree+0x92/0x320 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3758 [inline] do_new_mount fs/namespace.c:3834 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4154 do_mount fs/namespace.c:4167 [inline] __do_sys_mount fs/namespace.c:4383 [inline] __se_sys_mount fs/namespace.c:4360 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4360 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 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.5.2302/18998: #0: ffff88805bee60d8 (&type->s_umount_key#28/1){+.+.}-{4:4}, at: alloc_super+0x244/0xd20 fs/super.c:345 #1: ffff88805bee6600 (sb_internal){.+.+}-{0:0}, at: evict+0x3c2/0xad0 fs/inode.c:841 #2: ffff888078c31380 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #2: ffff888078c31380 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6474 [inline] #2: ffff888078c31380 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x5f0/0x890 fs/ext4/inode.c:6555 stack backtrace: CPU: 0 UID: 0 PID: 18998 Comm: syz.5.2302 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 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 kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b1/0x370 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:1811 [inline] ext4_writepages+0x21d/0x790 fs/ext4/inode.c:3041 do_writepages+0x278/0x600 mm/page-writeback.c:2575 __writeback_single_inode+0x164/0x1350 fs/fs-writeback.c:1762 writeback_single_inode+0x4d3/0xf30 fs/fs-writeback.c:1881 write_inode_now+0x174/0x1f0 fs/fs-writeback.c:2972 iput_final fs/inode.c:1950 [inline] iput.part.0+0x7f3/0xf50 fs/inode.c:2009 iput+0x35/0x40 fs/inode.c:1975 ext4_xattr_block_set+0x1426/0x3660 fs/ext4/xattr.c:2153 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:6434 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6477 [inline] __ext4_mark_inode_dirty+0x67d/0x890 fs/ext4/inode.c:6555 ext4_evict_inode+0x846/0x1a30 fs/ext4/inode.c:267 evict+0x3c2/0xad0 fs/inode.c:841 iput_final fs/inode.c:1960 [inline] iput.part.0+0x605/0xf50 fs/inode.c:2009 iput+0x35/0x40 fs/inode.c:1975 ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5701 [inline] ext4_fill_super+0x916c/0xb5d0 fs/ext4/super.c:5824 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1694 vfs_get_tree+0x92/0x320 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3758 [inline] do_new_mount fs/namespace.c:3834 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4154 do_mount fs/namespace.c:4167 [inline] __do_sys_mount fs/namespace.c:4383 [inline] __se_sys_mount fs/namespace.c:4360 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4360 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5ec499da8a 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:00007f5ec57fbe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f5ec57fbee0 RCX: 00007f5ec499da8a RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f5ec57fbea0 RBP: 0000200000000180 R08: 00007f5ec57fbee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007f5ec57fbea0 R14: 000000000000047a R15: 000000000000002c EXT4-fs error (device loop5): ext4_xattr_inode_iget:441: inode #11: comm syz.5.2302: iget: bad extra_isize 58 (inode size 256) loop5: lost file I/O error report for ino 11 type 5 pos 0x0 len 0x0 error -117 EXT4-fs (loop5): Remounting filesystem read-only EXT4-fs warning (device loop5): ext4_evict_inode:269: couldn't mark inode dirty (err -30) EXT4-fs (loop5): 1 orphan inode deleted EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.