====================================================== WARNING: possible circular locking dependency detected 6.6.100-syzkaller #0 Not tainted ------------------------------------------------------ syz.3.628/8936 is trying to acquire lock: ffff88806199d980 (&ni->ni_lock#2/5){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1120 [inline] ffff88806199d980 (&ni->ni_lock#2/5){+.+.}-{3:3}, at: ntfs_fallocate+0x7b2/0xfd0 fs/ntfs3/file.c:554 but task is already holding lock: ffff88806199ddc0 (mapping.invalidate_lock#9){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:849 [inline] ffff88806199ddc0 (mapping.invalidate_lock#9){++++}-{3:3}, at: ntfs_fallocate+0x3c5/0xfd0 fs/ntfs3/file.c:484 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (mapping.invalidate_lock#9){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:859 [inline] filemap_fault+0x5db/0x15a0 mm/filemap.c:3330 __do_fault+0x13b/0x4e0 mm/memory.c:4243 do_read_fault mm/memory.c:4616 [inline] do_fault mm/memory.c:4753 [inline] do_pte_missing mm/memory.c:3688 [inline] handle_pte_fault mm/memory.c:5025 [inline] __handle_mm_fault mm/memory.c:5166 [inline] handle_mm_fault+0x3886/0x4920 mm/memory.c:5331 do_user_addr_fault+0x738/0x12e0 arch/x86/mm/fault.c:1373 handle_page_fault arch/x86/mm/fault.c:1465 [inline] exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 do_strncpy_from_user lib/strncpy_from_user.c:-1 [inline] strncpy_from_user+0xff/0x2e0 lib/strncpy_from_user.c:139 getname_flags+0xf6/0x500 fs/namei.c:151 do_sys_openat2+0xcb/0x1c0 fs/open.c:1413 do_sys_open fs/open.c:1434 [inline] __do_sys_openat fs/open.c:1450 [inline] __se_sys_openat fs/open.c:1445 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1445 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc6/0x120 mm/memory.c:5946 _copy_to_user+0x2a/0xa0 lib/usercopy.c:36 copy_to_user include/linux/uaccess.h:191 [inline] fiemap_fill_next_extent+0x1c1/0x390 fs/ioctl.c:145 ni_fiemap+0x7e6/0xbe0 fs/ntfs3/frecord.c:2038 ntfs_fiemap+0xdb/0x130 fs/ntfs3/file.c:1213 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x140c/0x1bb0 fs/ioctl.c:811 __do_sys_ioctl fs/ioctl.c:869 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ni->ni_lock#2/5){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 ni_lock fs/ntfs3/ntfs_fs.h:1120 [inline] ntfs_fallocate+0x7b2/0xfd0 fs/ntfs3/file.c:554 vfs_fallocate+0x58e/0x700 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0xc1/0x110 fs/open.c:353 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &ni->ni_lock#2/5 --> &mm->mmap_lock --> mapping.invalidate_lock#9 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(mapping.invalidate_lock#9); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#9); lock(&ni->ni_lock#2/5); *** DEADLOCK *** 3 locks held by syz.3.628/8936: #0: ffff8880257e6418 (sb_writers#17){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2711 [inline] #0: ffff8880257e6418 (sb_writers#17){.+.+}-{0:0}, at: vfs_fallocate+0x4fb/0x700 fs/open.c:323 #1: ffff88806199dc30 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff88806199dc30 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: ntfs_fallocate+0x2fe/0xfd0 fs/ntfs3/file.c:470 #2: ffff88806199ddc0 (mapping.invalidate_lock#9){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:849 [inline] #2: ffff88806199ddc0 (mapping.invalidate_lock#9){++++}-{3:3}, at: ntfs_fallocate+0x3c5/0xfd0 fs/ntfs3/file.c:484 stack backtrace: CPU: 1 PID: 8936 Comm: syz.3.628 Not tainted 6.6.100-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 ni_lock fs/ntfs3/ntfs_fs.h:1120 [inline] ntfs_fallocate+0x7b2/0xfd0 fs/ntfs3/file.c:554 vfs_fallocate+0x58e/0x700 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0xc1/0x110 fs/open.c:353 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3b39d8eb69 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:00007f3b3ab7b038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f3b39fb6080 RCX: 00007f3b39d8eb69 RDX: 0000000000004000 RSI: 0000000000000008 RDI: 0000000000000004 RBP: 00007f3b39e11df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f3b39fb6080 R15: 00007ffc20592288