loop0: detected capacity change from 0 to 4096 ============================================ WARNING: possible recursive locking detected 6.15.0-syzkaller-13655-gbdc7f8c5adad #0 Not tainted -------------------------------------------- syz.0.0/5327 is trying to acquire lock: ffff888043aa9e60 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] ffff888043aa9e60 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: mi_read+0x2d4/0x5a0 fs/ntfs3/record.c:148 but task is already holding lock: ffff888043aaef28 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] ffff888043aaef28 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:858 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&ni->ni_lock#3/5); lock(&ni->ni_lock#3/5); *** DEADLOCK *** May be due to missing lock nesting notation 6 locks held by syz.0.0/5327: #0: ffff888000a54478 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1213 #1: ffff88801eaf0428 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3092 [inline] #1: ffff88801eaf0428 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 fs/read_write.c:682 #2: ffff888043aaf1c0 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:897 [inline] #2: ffff888043aaf1c0 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: ntfs_file_write_iter+0x78/0x820 fs/ntfs3/file.c:1160 #3: ffff888043aaef28 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] #3: ffff888043aaef28 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:858 #4: ffff888043aaefd8 (&ni->file.run_lock#3){+.+.}-{4:4}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:859 #5: ffff88801eaf4128 (&wnd->rw_lock/1){+.+.}-{4:4}, at: ntfs_look_free_mft+0x163/0xd50 fs/ntfs3/fsntfs.c:571 stack backtrace: CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted 6.15.0-syzkaller-13655-gbdc7f8c5adad #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3044 check_deadlock kernel/locking/lockdep.c:3096 [inline] validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3898 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 ni_lock fs/ntfs3/ntfs_fs.h:1100 [inline] mi_read+0x2d4/0x5a0 fs/ntfs3/record.c:148 mi_format_new+0x1a3/0x610 fs/ntfs3/record.c:434 ni_add_subrecord+0xd0/0x440 fs/ntfs3/frecord.c:321 ntfs_look_free_mft+0x6aa/0xd50 fs/ntfs3/fsntfs.c:715 ni_create_attr_list+0x8ff/0x13d0 fs/ntfs3/frecord.c:826 ni_ins_attr_ext+0x43e/0xb50 fs/ntfs3/frecord.c:924 ni_insert_attr+0x2fb/0x870 fs/ntfs3/frecord.c:1091 ni_insert_nonresident+0x277/0x680 fs/ntfs3/frecord.c:1426 attr_make_nonresident+0x5a4/0xbe0 fs/ntfs3/attrib.c:317 attr_set_size_res fs/ntfs3/attrib.c:373 [inline] attr_set_size+0x1f9f/0x2c70 fs/ntfs3/attrib.c:434 ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:861 ntfs_extend+0x1d9/0x970 fs/ntfs3/file.c:343 ntfs_file_write_iter+0x3f4/0x820 fs/ntfs3/file.c:1192 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x548/0xa90 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6cdbf8e929 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:00007f6cdce76038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f6cdc1b5fa0 RCX: 00007f6cdbf8e929 RDX: 0000000000000020 RSI: 0000200000000000 RDI: 0000000000000004 RBP: 00007f6cdc010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6cdc1b5fa0 R15: 00007ffeec308cf8