loop6: detected capacity change from 0 to 4096 ntfs3: loop6: Failed to load $Extend (-22). ntfs3: loop6: Failed to initialize $Extend. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.6.5030/19363 is trying to acquire lock: ffff88802697e270 (&wnd->rw_lock){++++}-{3:3}, at: ntfs_look_for_free_space+0xdf/0x630 fs/ntfs3/fsntfs.c:362 but task is already holding lock: ffff88805edaf7b0 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:857 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->file.run_lock#2){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 run_unpack_ex+0x858/0xc40 fs/ntfs3/run.c:1138 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0x2080/0x37f0 fs/ntfs3/inode.c:535 ntfs_dir_emit fs/ntfs3/dir.c:340 [inline] ntfs_read_hdr+0x77d/0xbd0 fs/ntfs3/dir.c:388 ntfs_readdir+0x8c9/0xe00 fs/ntfs3/dir.c:498 iterate_dir+0x1bd/0x590 fs/readdir.c:106 __do_sys_getdents64 fs/readdir.c:405 [inline] __se_sys_getdents64+0xf6/0x270 fs/readdir.c:390 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&wnd->rw_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3a07/0x7eb0 kernel/locking/lockdep.c:5171 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5790 down_write_nested+0x9e/0x200 kernel/locking/rwsem.c:1689 ntfs_look_for_free_space+0xdf/0x630 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1be/0x6b0 fs/ntfs3/attrib.c:159 attr_set_size+0x1406/0x2ae0 fs/ntfs3/attrib.c:577 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:859 ntfs_extend+0x157/0x4d0 fs/ntfs3/file.c:335 ntfs_file_write_iter+0x3ab/0x700 fs/ntfs3/file.c:1120 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x747/0xc50 fs/read_write.c:860 iter_file_splice_write+0x6b6/0xcf0 fs/splice.c:736 do_splice_from fs/splice.c:933 [inline] direct_splice_actor+0xe8/0x130 fs/splice.c:1142 splice_direct_to_actor+0x30b/0x8e0 fs/splice.c:1088 do_splice_direct+0x1d5/0x2f0 fs/splice.c:1194 do_sendfile+0x52b/0xe80 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64+0x145/0x1a0 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 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(&ni->file.run_lock#2); lock(&wnd->rw_lock); lock(&ni->file.run_lock#2); lock(&wnd->rw_lock); *** DEADLOCK *** 4 locks held by syz.6.5030/19363: #0: ffff88814bf98418 (sb_writers#17){.+.+}-{0:0}, at: do_sendfile+0x506/0xe80 fs/read_write.c:1253 #1: ffff88805edaf9b0 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:824 [inline] #1: ffff88805edaf9b0 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: ntfs_file_write_iter+0x23f/0x700 fs/ntfs3/file.c:1098 #2: ffff88805edaf700 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1124 [inline] #2: ffff88805edaf700 (&ni->ni_lock/5){+.+.}-{3:3}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:856 #3: ffff88805edaf7b0 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:857 stack backtrace: CPU: 1 PID: 19363 Comm: syz.6.5030 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2215 check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3a07/0x7eb0 kernel/locking/lockdep.c:5171 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5790 down_write_nested+0x9e/0x200 kernel/locking/rwsem.c:1689 ntfs_look_for_free_space+0xdf/0x630 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1be/0x6b0 fs/ntfs3/attrib.c:159 attr_set_size+0x1406/0x2ae0 fs/ntfs3/attrib.c:577 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:859 ntfs_extend+0x157/0x4d0 fs/ntfs3/file.c:335 ntfs_file_write_iter+0x3ab/0x700 fs/ntfs3/file.c:1120 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x747/0xc50 fs/read_write.c:860 iter_file_splice_write+0x6b6/0xcf0 fs/splice.c:736 do_splice_from fs/splice.c:933 [inline] direct_splice_actor+0xe8/0x130 fs/splice.c:1142 splice_direct_to_actor+0x30b/0x8e0 fs/splice.c:1088 do_splice_direct+0x1d5/0x2f0 fs/splice.c:1194 do_sendfile+0x52b/0xe80 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64+0x145/0x1a0 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fcd8579e559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcd86640028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fcd85a25fa0 RCX: 00007fcd8579e559 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007fcd85835ad8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcd85a26038 R14: 00007fcd85a25fa0 R15: 00007fff2c1c0678 ntfs3: loop6: no free space to extend mft