====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc5-syzkaller-00123-g2c89c1b655c0 #0 Not tainted ------------------------------------------------------ syz.2.377/9801 is trying to acquire lock: ffff888028c91fe0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:193 but task is already holding lock: ffff888079db3700 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline] ffff888079db3700 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: ntfs_file_write_iter+0x78/0x820 fs/ntfs3/file.c:1250 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] ntfs_file_mmap+0x525/0x730 fs/ntfs3/file.c:397 call_mmap include/linux/fs.h:2243 [inline] mmap_file mm/internal.h:167 [inline] __mmap_new_file_vma mm/vma.c:2353 [inline] __mmap_new_vma mm/vma.c:2417 [inline] __mmap_region mm/vma.c:2519 [inline] mmap_region+0x103b/0x1e50 mm/vma.c:2597 do_mmap+0xc68/0x1100 mm/mmap.c:561 vm_mmap_pgoff+0x31b/0x4c0 mm/util.c:579 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:607 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&mm->mmap_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_read_killable+0x50/0x350 kernel/locking/rwsem.c:1547 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:193 get_mmap_lock_carefully mm/memory.c:6355 [inline] lock_mm_and_find_vma+0x2a8/0x300 mm/memory.c:6406 do_user_addr_fault+0x331/0x1390 arch/x86/mm/fault.c:1360 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 fault_in_readable+0xd3/0x160 mm/gup.c:2240 fault_in_iov_iter_readable+0x1b4/0x2f0 lib/iov_iter.c:94 generic_perform_write+0x7cc/0x910 mm/filemap.c:4152 ntfs_file_write_iter+0x71c/0x820 fs/ntfs3/file.c:1287 do_iter_readv_writev+0x56b/0x7f0 fs/read_write.c:-1 vfs_writev+0x306/0x9a0 fs/read_write.c:1055 do_pwritev fs/read_write.c:1151 [inline] __do_sys_pwritev2 fs/read_write.c:1209 [inline] __se_sys_pwritev2+0x179/0x290 fs/read_write.c:1200 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 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 ---- ---- lock(&sb->s_type->i_mutex_key#20); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#20); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz.2.377/9801: #0: ffff88806d5b0420 (sb_writers#14){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline] #0: ffff88806d5b0420 (sb_writers#14){.+.+}-{0:0}, at: vfs_writev+0x274/0x9a0 fs/read_write.c:1053 #1: ffff888079db3700 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline] #1: ffff888079db3700 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: ntfs_file_write_iter+0x78/0x820 fs/ntfs3/file.c:1250 stack backtrace: CPU: 0 UID: 0 PID: 9801 Comm: syz.2.377 Not tainted 6.15.0-rc5-syzkaller-00123-g2c89c1b655c0 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_read_killable+0x50/0x350 kernel/locking/rwsem.c:1547 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:193 get_mmap_lock_carefully mm/memory.c:6355 [inline] lock_mm_and_find_vma+0x2a8/0x300 mm/memory.c:6406 do_user_addr_fault+0x331/0x1390 arch/x86/mm/fault.c:1360 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0xd3/0x160 mm/gup.c:2241 Code: 13 68 ba ff 4d 89 f4 49 81 cc ff 0f 00 00 4d 89 f7 49 01 dc 49 81 e4 00 f0 ff ff 4d 39 e6 77 44 e8 f2 67 ba ff 4d 39 e7 74 47 <41> 8a 07 88 44 24 07 49 81 c7 00 10 00 00 4d 39 e7 74 07 e8 d5 67 RSP: 0018:ffffc9000c847930 EFLAGS: 00050287 RAX: ffffffff8205676e RBX: 0000000000000c6e RCX: 0000000000080000 RDX: ffffc9001ec0a000 RSI: 0000000000003caf RDI: 0000000000003cb0 RBP: dffffc0000000000 R08: ffff88802d8f1e00 R09: 0000000000000002 R10: 0000000000000001 R11: 0000000000000002 R12: 000020000000a000 R13: 000000000000e392 R14: 0000200000009000 R15: 0000200000009000 fault_in_iov_iter_readable+0x1b4/0x2f0 lib/iov_iter.c:94 generic_perform_write+0x7cc/0x910 mm/filemap.c:4152 ntfs_file_write_iter+0x71c/0x820 fs/ntfs3/file.c:1287 do_iter_readv_writev+0x56b/0x7f0 fs/read_write.c:-1 vfs_writev+0x306/0x9a0 fs/read_write.c:1055 do_pwritev fs/read_write.c:1151 [inline] __do_sys_pwritev2 fs/read_write.c:1209 [inline] __se_sys_pwritev2+0x179/0x290 fs/read_write.c:1200 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f64b938e969 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:00007f64b71d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f64b95b6080 RCX: 00007f64b938e969 RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000004 RBP: 00007f64b9410ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000005412 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f64b95b6080 R15: 00007ffeaa00c2b8 ---------------- Code disassembly (best guess): 0: 13 68 ba adc -0x46(%rax),%ebp 3: ff 4d 89 decl -0x77(%rbp) 6: f4 hlt 7: 49 81 cc ff 0f 00 00 or $0xfff,%r12 e: 4d 89 f7 mov %r14,%r15 11: 49 01 dc add %rbx,%r12 14: 49 81 e4 00 f0 ff ff and $0xfffffffffffff000,%r12 1b: 4d 39 e6 cmp %r12,%r14 1e: 77 44 ja 0x64 20: e8 f2 67 ba ff call 0xffba6817 25: 4d 39 e7 cmp %r12,%r15 28: 74 47 je 0x71 * 2a: 41 8a 07 mov (%r15),%al <-- trapping instruction 2d: 88 44 24 07 mov %al,0x7(%rsp) 31: 49 81 c7 00 10 00 00 add $0x1000,%r15 38: 4d 39 e7 cmp %r12,%r15 3b: 74 07 je 0x44 3d: e8 .byte 0xe8 3e: d5 (bad) 3f: 67 addr32