====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc2-syzkaller-00042-g1a1d569a75f3 #0 Not tainted ------------------------------------------------------ syz.6.419/7690 is trying to acquire lock: ffff8880752395e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:193 [inline] ffff8880752395e0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6355 [inline] ffff8880752395e0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x3e7/0x6e0 mm/memory.c:6406 but task is already holding lock: ffff88805b214d08 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline] ffff88805b214d08 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: ntfs_file_write_iter+0xde/0x2380 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}: down_write+0x92/0x200 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] ntfs_file_mmap+0x60c/0x780 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+0x1488/0x27c0 mm/vma.c:2476 mmap_region+0x32b/0x3f0 mm/vma.c:2554 do_mmap+0xd8e/0x11b0 mm/mmap.c:561 vm_mmap_pgoff+0x281/0x450 mm/util.c:579 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:607 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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 kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 down_read_killable+0x9e/0x4b0 kernel/locking/rwsem.c:1547 mmap_read_lock_killable include/linux/mmap_lock.h:193 [inline] get_mmap_lock_carefully mm/memory.c:6355 [inline] lock_mm_and_find_vma+0x3e7/0x6e0 mm/memory.c:6406 do_user_addr_fault+0x2ac/0x1370 arch/x86/mm/fault.c:1360 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 fault_in_readable+0x160/0x200 mm/gup.c:2241 fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94 generic_perform_write+0x7b4/0x930 mm/filemap.c:4151 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4219 ntfs_file_write_iter+0xee5/0x2380 fs/ntfs3/file.c:1287 do_iter_readv_writev+0x657/0x950 fs/read_write.c:825 vfs_writev+0x353/0xdc0 fs/read_write.c:1055 do_pwritev+0x1af/0x270 fs/read_write.c:1151 __do_sys_pwritev2 fs/read_write.c:1209 [inline] __se_sys_pwritev2 fs/read_write.c:1200 [inline] __x64_sys_pwritev2+0xef/0x160 fs/read_write.c:1200 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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.6.419/7690: #0: ffff888027494420 (sb_writers#12){.+.+}-{0:0}, at: do_pwritev+0x1af/0x270 fs/read_write.c:1151 #1: ffff88805b214d08 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline] #1: ffff88805b214d08 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: ntfs_file_write_iter+0xde/0x2380 fs/ntfs3/file.c:1250 stack backtrace: CPU: 1 UID: 0 PID: 7690 Comm: syz.6.419 Not tainted 6.15.0-rc2-syzkaller-00042-g1a1d569a75f3 #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+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079 check_noncircular+0x14c/0x170 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 kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 down_read_killable+0x9e/0x4b0 kernel/locking/rwsem.c:1547 mmap_read_lock_killable include/linux/mmap_lock.h:193 [inline] get_mmap_lock_carefully mm/memory.c:6355 [inline] lock_mm_and_find_vma+0x3e7/0x6e0 mm/memory.c:6406 do_user_addr_fault+0x2ac/0x1370 arch/x86/mm/fault.c:1360 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0x160/0x200 mm/gup.c:2241 Code: 42 e8 45 31 f6 e8 50 1c b8 ff 48 39 eb 75 13 eb 2e e8 44 1c b8 ff 48 81 c3 00 10 00 00 48 39 eb 74 1d e8 33 1c b8 ff 45 89 f7 <8a> 03 31 ff 44 89 fe 88 44 24 28 e8 60 17 b8 ff 45 85 ff 74 d2 e8 RSP: 0018:ffffc90003317790 EFLAGS: 00050287 RAX: 000000000000d40a RBX: 0000200000007000 RCX: ffffc9000ad19000 RDX: 0000000000080000 RSI: ffffffff8203208d RDI: 0000000000000007 RBP: 0000200000008000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000205 R13: 0000200000007000 R14: 0000000000000000 R15: 0000000000000000 fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94 generic_perform_write+0x7b4/0x930 mm/filemap.c:4151 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4219 ntfs_file_write_iter+0xee5/0x2380 fs/ntfs3/file.c:1287 do_iter_readv_writev+0x657/0x950 fs/read_write.c:825 vfs_writev+0x353/0xdc0 fs/read_write.c:1055 do_pwritev+0x1af/0x270 fs/read_write.c:1151 __do_sys_pwritev2 fs/read_write.c:1209 [inline] __se_sys_pwritev2 fs/read_write.c:1200 [inline] __x64_sys_pwritev2+0xef/0x160 fs/read_write.c:1200 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f95da98e169 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:00007f95db767038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f95dabb5fa0 RCX: 00007f95da98e169 RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000006 RBP: 00007f95daa10a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f95dabb5fa0 R15: 00007ffe068ad018 ---------------- Code disassembly (best guess): 0: 42 e8 45 31 f6 e8 rex.X call 0xe8f6314b 6: 50 push %rax 7: 1c b8 sbb $0xb8,%al 9: ff 48 39 decl 0x39(%rax) c: eb 75 jmp 0x83 e: 13 eb adc %ebx,%ebp 10: 2e e8 44 1c b8 ff cs call 0xffb81c5a 16: 48 81 c3 00 10 00 00 add $0x1000,%rbx 1d: 48 39 eb cmp %rbp,%rbx 20: 74 1d je 0x3f 22: e8 33 1c b8 ff call 0xffb81c5a 27: 45 89 f7 mov %r14d,%r15d * 2a: 8a 03 mov (%rbx),%al <-- trapping instruction 2c: 31 ff xor %edi,%edi 2e: 44 89 fe mov %r15d,%esi 31: 88 44 24 28 mov %al,0x28(%rsp) 35: e8 60 17 b8 ff call 0xffb8179a 3a: 45 85 ff test %r15d,%r15d 3d: 74 d2 je 0x11 3f: e8 .byte 0xe8