loop2: detected capacity change from 0 to 4096 ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc2-syzkaller-00162-g41687a5c6f8b #0 Not tainted ------------------------------------------------------ syz.2.5760/21909 is trying to acquire lock: ffff888033a16d60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:421 [inline] ffff888033a16d60 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:197 [inline] ffff888033a16d60 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x3e7/0x6e0 mm/mmap_lock.c:248 but task is already holding lock: ffff88804bfe9248 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:899 [inline] ffff88804bfe9248 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: ntfs_file_write_iter+0xdf/0x2120 fs/ntfs3/file.c:1160 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}: down_write+0x92/0x200 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:869 [inline] ntfs_file_mmap+0x60c/0x780 fs/ntfs3/file.c:313 call_mmap include/linux/fs.h:2286 [inline] mmap_file mm/internal.h:167 [inline] __mmap_new_file_vma mm/vma.c:2405 [inline] __mmap_new_vma mm/vma.c:2467 [inline] __mmap_region+0x128e/0x25e0 mm/vma.c:2622 mmap_region+0x32b/0x3f0 mm/vma.c:2692 do_mmap+0xa3e/0x1210 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/0x4c0 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:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 down_read_killable+0x9e/0x4b0 kernel/locking/rwsem.c:1547 mmap_read_lock_killable include/linux/mmap_lock.h:421 [inline] get_mmap_lock_carefully mm/mmap_lock.c:197 [inline] lock_mm_and_find_vma+0x3e7/0x6e0 mm/mmap_lock.c:248 do_user_addr_fault+0x2ac/0x1370 arch/x86/mm/fault.c:1359 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 fault_in_readable+0x135/0x1d0 mm/gup.c:2227 fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94 generic_perform_write+0x7b4/0x930 mm/filemap.c:4161 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4229 ntfs_file_write_iter+0xed3/0x2120 fs/ntfs3/file.c:1197 do_iter_readv_writev+0x657/0x950 fs/read_write.c:827 vfs_writev+0x35f/0xde0 fs/read_write.c:1057 do_pwritev+0x1a6/0x270 fs/read_write.c:1153 __do_sys_pwritev2 fs/read_write.c:1211 [inline] __se_sys_pwritev2 fs/read_write.c:1202 [inline] __x64_sys_pwritev2+0xef/0x160 fs/read_write.c:1202 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 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#28); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#28); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz.2.5760/21909: #0: ffff8880364a6428 (sb_writers#21){.+.+}-{0:0}, at: do_pwritev+0x1a6/0x270 fs/read_write.c:1153 #1: ffff88804bfe9248 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:899 [inline] #1: ffff88804bfe9248 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: ntfs_file_write_iter+0xdf/0x2120 fs/ntfs3/file.c:1160 stack backtrace: CPU: 1 UID: 0 PID: 21909 Comm: syz.2.5760 Not tainted 6.16.0-rc2-syzkaller-00162-g41687a5c6f8b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 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:2046 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 down_read_killable+0x9e/0x4b0 kernel/locking/rwsem.c:1547 mmap_read_lock_killable include/linux/mmap_lock.h:421 [inline] get_mmap_lock_carefully mm/mmap_lock.c:197 [inline] lock_mm_and_find_vma+0x3e7/0x6e0 mm/mmap_lock.c:248 do_user_addr_fault+0x2ac/0x1370 arch/x86/mm/fault.c:1359 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0x135/0x1d0 mm/gup.c:2227 Code: e1 a5 b7 ff 48 85 db 0f 84 9c 00 00 00 e8 63 aa b7 ff 48 89 de 48 89 ef e8 08 a5 b7 ff 48 39 eb 73 1d e8 4e aa b7 ff 45 89 f7 <8a> 03 31 ff 44 89 fe 88 44 24 28 e8 7b a5 b7 ff 45 85 ff 74 a8 e8 RSP: 0018:ffffc9000ec8f790 EFLAGS: 00050283 RAX: 000000000000c6a4 RBX: 000020000000c000 RCX: ffffc9000c7cb000 RDX: 0000000000080000 RSI: ffffffff82047132 RDI: 0000000000000006 RBP: 000020000000c205 R08: 0000000000000006 R09: 000020000000c000 R10: 000020000000c205 R11: 0000000000000000 R12: 000020000000c000 R13: 0000000000000205 R14: 0000000000000000 R15: 0000000000000000 fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94 generic_perform_write+0x7b4/0x930 mm/filemap.c:4161 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4229 ntfs_file_write_iter+0xed3/0x2120 fs/ntfs3/file.c:1197 do_iter_readv_writev+0x657/0x950 fs/read_write.c:827 vfs_writev+0x35f/0xde0 fs/read_write.c:1057 do_pwritev+0x1a6/0x270 fs/read_write.c:1153 __do_sys_pwritev2 fs/read_write.c:1211 [inline] __se_sys_pwritev2 fs/read_write.c:1202 [inline] __x64_sys_pwritev2+0xef/0x160 fs/read_write.c:1202 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fda19f8e929 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:00007fda1ae4e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007fda1a1b5fa0 RCX: 00007fda19f8e929 RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000004 RBP: 00007fda1a010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fda1a1b5fa0 R15: 00007ffeaa9ebf48 ---------------- Code disassembly (best guess): 0: e1 a5 loope 0xffffffa7 2: b7 ff mov $0xff,%bh 4: 48 85 db test %rbx,%rbx 7: 0f 84 9c 00 00 00 je 0xa9 d: e8 63 aa b7 ff call 0xffb7aa75 12: 48 89 de mov %rbx,%rsi 15: 48 89 ef mov %rbp,%rdi 18: e8 08 a5 b7 ff call 0xffb7a525 1d: 48 39 eb cmp %rbp,%rbx 20: 73 1d jae 0x3f 22: e8 4e aa b7 ff call 0xffb7aa75 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 7b a5 b7 ff call 0xffb7a5b5 3a: 45 85 ff test %r15d,%r15d 3d: 74 a8 je 0xffffffe7 3f: e8 .byte 0xe8