====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.1621/12024 is trying to acquire lock: ffff888058b96068 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ffff888058b96068 (&ei->xattr_sem){++++}-{4:4}, at: ext4_destroy_inline_data+0x2d/0xe0 fs/ext4/inline.c:1787 but task is already holding lock: ffff8880339a6b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x27a/0x600 mm/page-writeback.c:2604 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_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:1796 [inline] ext4_writepages+0x224/0x7d0 fs/ext4/inode.c:3024 do_writepages+0x27a/0x600 mm/page-writeback.c:2604 __writeback_single_inode+0x160/0xfb0 fs/fs-writeback.c:1719 writeback_single_inode+0x2bc/0x550 fs/fs-writeback.c:1840 write_inode_now+0x170/0x1e0 fs/fs-writeback.c:2903 iput_final fs/inode.c:1901 [inline] iput.part.0+0x487/0xb00 fs/inode.c:1966 iput+0x35/0x40 fs/inode.c:1929 ext4_xattr_block_set+0x67c/0x3650 fs/ext4/xattr.c:2199 ext4_xattr_move_to_block fs/ext4/xattr.c:2664 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2739 [inline] ext4_expand_extra_isize_ea+0x1442/0x1ab0 fs/ext4/xattr.c:2827 __ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:6364 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6407 [inline] __ext4_mark_inode_dirty+0x544/0x870 fs/ext4/inode.c:6485 ext4_evict_inode+0x74e/0x18e0 fs/ext4/inode.c:254 evict+0x3e6/0x920 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput.part.0+0x6a9/0xb00 fs/inode.c:1966 iput+0x35/0x40 fs/inode.c:1929 ext4_orphan_cleanup+0x731/0x11e0 fs/ext4/orphan.c:470 __ext4_fill_super fs/ext4/super.c:5617 [inline] ext4_fill_super+0x8db7/0xaf70 fs/ext4/super.c:5736 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691 vfs_get_tree+0x8e/0x340 fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount fs/namespace.c:3727 [inline] path_mount+0x7b9/0x23a0 fs/namespace.c:4037 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount fs/namespace.c:4215 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4215 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ei->xattr_sem){++++}-{4:4}: 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+0x126f/0x1c90 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 down_write+0x92/0x200 kernel/locking/rwsem.c:1590 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_destroy_inline_data+0x2d/0xe0 fs/ext4/inline.c:1787 ext4_do_writepages+0x1154/0x3cf0 fs/ext4/inode.c:2810 ext4_writepages+0x37a/0x7d0 fs/ext4/inode.c:3025 do_writepages+0x27a/0x600 mm/page-writeback.c:2604 filemap_fdatawrite_wbc mm/filemap.c:389 [inline] filemap_fdatawrite_wbc+0x104/0x160 mm/filemap.c:379 __filemap_fdatawrite_range+0xb9/0x100 mm/filemap.c:422 file_write_and_wait_range+0xca/0x140 mm/filemap.c:797 generic_buffers_fsync_noflush+0x76/0x310 fs/buffer.c:609 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] ext4_sync_file+0x896/0xf10 fs/ext4/fsync.c:147 vfs_fsync_range+0x139/0x220 fs/sync.c:187 generic_write_sync include/linux/fs.h:3046 [inline] ext4_buffered_write_iter+0x2e0/0x440 fs/ext4/file.c:305 ext4_file_write_iter+0xa4c/0x1d10 fs/ext4/file.c:723 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d3/0x11d0 fs/read_write.c:686 ksys_pwrite64 fs/read_write.c:793 [inline] __do_sys_pwrite64 fs/read_write.c:801 [inline] __se_sys_pwrite64 fs/read_write.c:798 [inline] __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 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 ---- ---- rlock(&sbi->s_writepages_rwsem); lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); lock(&ei->xattr_sem); *** DEADLOCK *** 2 locks held by syz.2.1621/12024: #0: ffff888057a38420 (sb_writers#4){.+.+}-{0:0}, at: ksys_pwrite64 fs/read_write.c:793 [inline] #0: ffff888057a38420 (sb_writers#4){.+.+}-{0:0}, at: __do_sys_pwrite64 fs/read_write.c:801 [inline] #0: ffff888057a38420 (sb_writers#4){.+.+}-{0:0}, at: __se_sys_pwrite64 fs/read_write.c:798 [inline] #0: ffff888057a38420 (sb_writers#4){.+.+}-{0:0}, at: __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798 #1: ffff8880339a6b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x27a/0x600 mm/page-writeback.c:2604 stack backtrace: CPU: 1 UID: 0 PID: 12024 Comm: syz.2.1621 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043 check_noncircular+0x14c/0x170 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+0x126f/0x1c90 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 down_write+0x92/0x200 kernel/locking/rwsem.c:1590 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_destroy_inline_data+0x2d/0xe0 fs/ext4/inline.c:1787 ext4_do_writepages+0x1154/0x3cf0 fs/ext4/inode.c:2810 ext4_writepages+0x37a/0x7d0 fs/ext4/inode.c:3025 do_writepages+0x27a/0x600 mm/page-writeback.c:2604 filemap_fdatawrite_wbc mm/filemap.c:389 [inline] filemap_fdatawrite_wbc+0x104/0x160 mm/filemap.c:379 __filemap_fdatawrite_range+0xb9/0x100 mm/filemap.c:422 file_write_and_wait_range+0xca/0x140 mm/filemap.c:797 generic_buffers_fsync_noflush+0x76/0x310 fs/buffer.c:609 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] ext4_sync_file+0x896/0xf10 fs/ext4/fsync.c:147 vfs_fsync_range+0x139/0x220 fs/sync.c:187 generic_write_sync include/linux/fs.h:3046 [inline] ext4_buffered_write_iter+0x2e0/0x440 fs/ext4/file.c:305 ext4_file_write_iter+0xa4c/0x1d10 fs/ext4/file.c:723 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d3/0x11d0 fs/read_write.c:686 ksys_pwrite64 fs/read_write.c:793 [inline] __do_sys_pwrite64 fs/read_write.c:801 [inline] __se_sys_pwrite64 fs/read_write.c:798 [inline] __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcfad78f6c9 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:00007fcfae6b9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fcfad9e6090 RCX: 00007fcfad78f6c9 RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000007 RBP: 00007fcfad811f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcfad9e6128 R14: 00007fcfad9e6090 R15: 00007ffdad337978 EXT4-fs (loop2): Delayed block allocation failed for inode 15 at logical offset 0 with max blocks 34 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=2415919104 EXT4-fs (loop2): dirty_blocks=48 EXT4-fs (loop2): Block reservation details EXT4-fs (loop2): i_reserved_data_blocks=3