loop9: detected capacity change from 0 to 4096 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.9.2170/13635 is trying to acquire lock: ffff888055b59e80 (&ni->ni_lock/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1102 [inline] ffff888055b59e80 (&ni->ni_lock/5){+.+.}-{3:3}, at: attr_data_get_block+0x33b/0x1b70 fs/ntfs3/attrib.c:951 but task is already holding lock: ffff88807a72f1d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] ffff88807a72f1d8 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x15d/0x2b0 mm/util.c:518 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc2/0x120 mm/memory.c:5852 _copy_to_user+0x27/0x130 lib/usercopy.c:36 copy_to_user include/linux/uaccess.h:169 [inline] ni_fiemap+0x4ec/0x1300 fs/ntfs3/frecord.c:2140 ntfs_fiemap+0xd7/0x130 fs/ntfs3/file.c:1173 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1425/0x1d10 fs/ioctl.c:810 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ni->ni_lock/5){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747 ni_lock fs/ntfs3/ntfs_fs.h:1102 [inline] attr_data_get_block+0x33b/0x1b70 fs/ntfs3/attrib.c:951 ntfs_get_block_vbo+0x3e4/0xca0 fs/ntfs3/inode.c:595 __block_write_begin_int+0x54b/0x1a70 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x96/0x1e0 fs/buffer.c:2102 ntfs_extend_initialized_size+0x36c/0x710 fs/ntfs3/file.c:159 ntfs_file_mmap+0x521/0x6d0 fs/ntfs3/file.c:324 call_mmap include/linux/fs.h:2270 [inline] mmap_file+0x5d/0xb0 mm/util.c:1109 __mmap_region mm/mmap.c:2772 [inline] mmap_region+0xe2c/0x1c70 mm/mmap.c:2916 do_mmap+0x958/0xfd0 mm/mmap.c:1436 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520 ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1482 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&ni->ni_lock/5); lock(&mm->mmap_lock); lock(&ni->ni_lock/5); *** DEADLOCK *** 2 locks held by syz.9.2170/13635: #0: ffff88807a72f1d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff88807a72f1d8 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x15d/0x2b0 mm/util.c:518 #1: ffff888055b5a120 (&sb->s_type->i_mutex_key#33){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:778 [inline] #1: ffff888055b5a120 (&sb->s_type->i_mutex_key#33){+.+.}-{3:3}, at: ntfs_file_mmap+0x4e1/0x6d0 fs/ntfs3/file.c:320 stack backtrace: CPU: 0 PID: 13635 Comm: syz.9.2170 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747 ni_lock fs/ntfs3/ntfs_fs.h:1102 [inline] attr_data_get_block+0x33b/0x1b70 fs/ntfs3/attrib.c:951 ntfs_get_block_vbo+0x3e4/0xca0 fs/ntfs3/inode.c:595 __block_write_begin_int+0x54b/0x1a70 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x96/0x1e0 fs/buffer.c:2102 ntfs_extend_initialized_size+0x36c/0x710 fs/ntfs3/file.c:159 ntfs_file_mmap+0x521/0x6d0 fs/ntfs3/file.c:324 call_mmap include/linux/fs.h:2270 [inline] mmap_file+0x5d/0xb0 mm/util.c:1109 __mmap_region mm/mmap.c:2772 [inline] mmap_region+0xe2c/0x1c70 mm/mmap.c:2916 do_mmap+0x958/0xfd0 mm/mmap.c:1436 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520 ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1482 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f282d38eba9 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:00007f282e2b9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f282d5d5fa0 RCX: 00007f282d38eba9 RDX: 8088e3ad122bc192 RSI: 0000000000600000 RDI: 0000200000000000 RBP: 00007f282d411e19 R08: 0000000000000004 R09: 0000000001000000 R10: 0000000004002011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f282d5d6038 R14: 00007f282d5d5fa0 R15: 00007ffc27ef17d8