====================================================== WARNING: possible circular locking dependency detected 6.14.0-syzkaller-12966-ga2cc6ff5ec8f #0 Not tainted ------------------------------------------------------ syz.4.33/6209 is trying to acquire lock: ffff8880534029e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:193 but task is already holding lock: ffff888060498af0 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline] ffff888060498af0 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: ntfs_file_write_iter+0x71/0x7e0 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#25){+.+.}-{4:4}: lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 down_write+0x9c/0x220 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] ntfs_file_mmap+0x63a/0x880 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:2310 [inline] __mmap_new_vma mm/vma.c:2374 [inline] __mmap_region mm/vma.c:2476 [inline] mmap_region+0x241d/0x2ea0 mm/vma.c:2554 do_mmap+0xd42/0x1420 mm/mmap.c:561 vm_mmap_pgoff+0x2a2/0x530 mm/util.c:579 ksys_mmap_pgoff+0x4ee/0x720 mm/mmap.c:607 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 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+0xa69/0x24e0 kernel/locking/lockdep.c:3909 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 down_read_killable+0xcb/0xcb0 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+0x29c/0x2f0 mm/memory.c:6406 do_user_addr_fault arch/x86/mm/fault.c:1360 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x1c1/0x920 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 fault_in_readable+0x115/0x2e0 mm/gup.c:2233 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x8a4/0xa10 mm/filemap.c:4151 ntfs_file_write_iter+0x6ef/0x7e0 fs/ntfs3/file.c:1287 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x70f/0xd10 fs/read_write.c:684 ksys_write+0x19d/0x2d0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 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#25); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#25); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.4.33/6209: #0: ffff8880338ddeb8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x310 fs/file.c:1213 #1: ffff88807ecee420 (sb_writers#17){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline] #1: ffff88807ecee420 (sb_writers#17){.+.+}-{0:0}, at: vfs_write+0x23f/0xd10 fs/read_write.c:680 #2: ffff888060498af0 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline] #2: ffff888060498af0 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: ntfs_file_write_iter+0x71/0x7e0 fs/ntfs3/file.c:1250 stack backtrace: CPU: 0 UID: 0 PID: 6209 Comm: syz.4.33 Not tainted 6.14.0-syzkaller-12966-ga2cc6ff5ec8f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2079 check_noncircular+0x142/0x160 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+0xa69/0x24e0 kernel/locking/lockdep.c:3909 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 down_read_killable+0xcb/0xcb0 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+0x29c/0x2f0 mm/memory.c:6406 do_user_addr_fault arch/x86/mm/fault.c:1360 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x1c1/0x920 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0x115/0x2e0 mm/gup.c:2234 Code: 8b 6c 24 08 4c 89 ee 48 81 e6 ff 0f 00 00 31 ff e8 90 57 b5 ff 4c 89 e8 48 25 ff 0f 00 00 49 bf 00 00 00 00 00 fc ff df 74 2a <41> 8a 5d 00 e8 92 52 b5 ff 43 0f b6 04 3e 84 c0 0f 85 6b 01 00 00 RSP: 0018:ffffc90003ecf9c0 EFLAGS: 00050206 RAX: 00000000000004c0 RBX: 00002000000015d8 RCX: ffff88802ced8000 RDX: 0000000000000000 RSI: 00000000000004c0 RDI: 0000000000000000 RBP: ffffc90003ecfa78 R08: ffffffff820df410 R09: ffffffff84fa2e99 R10: 0000000000000002 R11: ffff88802ced8000 R12: 0000000000000118 R13: 00002000000014c0 R14: 1ffff920007d9f40 R15: dffffc0000000000 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x8a4/0xa10 mm/filemap.c:4151 ntfs_file_write_iter+0x6ef/0x7e0 fs/ntfs3/file.c:1287 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x70f/0xd10 fs/read_write.c:684 ksys_write+0x19d/0x2d0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbdb9f8d169 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:00007fbdbad82038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fbdba1a6080 RCX: 00007fbdb9f8d169 RDX: 0000000000000118 RSI: 00002000000014c0 RDI: 0000000000000004 RBP: 00007fbdba00e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fbdba1a6080 R15: 00007ffc90b143a8 ---------------- Code disassembly (best guess): 0: 8b 6c 24 08 mov 0x8(%rsp),%ebp 4: 4c 89 ee mov %r13,%rsi 7: 48 81 e6 ff 0f 00 00 and $0xfff,%rsi e: 31 ff xor %edi,%edi 10: e8 90 57 b5 ff call 0xffb557a5 15: 4c 89 e8 mov %r13,%rax 18: 48 25 ff 0f 00 00 and $0xfff,%rax 1e: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 25: fc ff df 28: 74 2a je 0x54 * 2a: 41 8a 5d 00 mov 0x0(%r13),%bl <-- trapping instruction 2e: e8 92 52 b5 ff call 0xffb552c5 33: 43 0f b6 04 3e movzbl (%r14,%r15,1),%eax 38: 84 c0 test %al,%al 3a: 0f 85 6b 01 00 00 jne 0x1ab