loop0: detected capacity change from 0 to 4096 netlink: 16 bytes leftover after parsing attributes in process `syz.0.345'. ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc2-syzkaller-gc72692105976 #0 Not tainted ------------------------------------------------------ syz.0.345/8163 is trying to acquire lock: ffff0000c2ec3d50 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x28/0x350 include/linux/mmap_lock.h:193 but task is already holding lock: ffff0000f6680af0 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline] ffff0000f6680af0 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: ntfs_file_write_iter+0x74/0x66c 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+0x50/0xc0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] ntfs_file_mmap+0x45c/0x5e8 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+0xc34/0x1a24 mm/vma.c:2554 do_mmap+0x968/0xf78 mm/mmap.c:561 vm_mmap_pgoff+0x2b8/0x43c mm/util.c:579 ksys_mmap_pgoff+0x394/0x5b8 mm/mmap.c:607 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #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+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 down_read_killable+0x60/0x32c kernel/locking/rwsem.c:1547 mmap_read_lock_killable+0x28/0x350 include/linux/mmap_lock.h:193 get_mmap_lock_carefully mm/memory.c:6355 [inline] lock_mm_and_find_vma+0x2a4/0x2d8 mm/memory.c:6406 do_page_fault+0x51c/0x1554 arch/arm64/mm/fault.c:668 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:919 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:432 el1h_64_sync_handler+0x50/0xcc arch/arm64/kernel/entry-common.c:510 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:595 __uaccess_mask_ptr arch/arm64/include/asm/uaccess.h:169 [inline] fault_in_readable+0x104/0x208 mm/gup.c:2234 fault_in_iov_iter_readable+0x1a8/0x2c4 lib/iov_iter.c:94 generic_perform_write+0x654/0x79c mm/filemap.c:4151 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4219 ntfs_file_write_iter+0x58c/0x66c fs/ntfs3/file.c:1287 do_iter_readv_writev+0x460/0x6a8 fs/read_write.c:-1 vfs_writev+0x2b4/0x81c 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 fs/read_write.c:1200 [inline] __arm64_sys_pwritev2+0x1bc/0x2cc fs/read_write.c:1200 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 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.0.345/8163: #0: ffff0000c264a420 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline] #0: ffff0000c264a420 (sb_writers#12){.+.+}-{0:0}, at: vfs_writev+0x22c/0x81c fs/read_write.c:1053 #1: ffff0000f6680af0 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline] #1: ffff0000f6680af0 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: ntfs_file_write_iter+0x74/0x66c fs/ntfs3/file.c:1250 stack backtrace: CPU: 0 UID: 0 PID: 8163 Comm: syz.0.345 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2079 check_noncircular+0x154/0x174 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+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 down_read_killable+0x60/0x32c kernel/locking/rwsem.c:1547 mmap_read_lock_killable+0x28/0x350 include/linux/mmap_lock.h:193 get_mmap_lock_carefully mm/memory.c:6355 [inline] lock_mm_and_find_vma+0x2a4/0x2d8 mm/memory.c:6406 do_page_fault+0x51c/0x1554 arch/arm64/mm/fault.c:668 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:919 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:432 el1h_64_sync_handler+0x50/0xcc arch/arm64/kernel/entry-common.c:510 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:595 __uaccess_mask_ptr arch/arm64/include/asm/uaccess.h:169 [inline] (P) fault_in_readable+0x104/0x208 mm/gup.c:2234 (P) fault_in_iov_iter_readable+0x1a8/0x2c4 lib/iov_iter.c:94 generic_perform_write+0x654/0x79c mm/filemap.c:4151 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4219 ntfs_file_write_iter+0x58c/0x66c fs/ntfs3/file.c:1287 do_iter_readv_writev+0x460/0x6a8 fs/read_write.c:-1 vfs_writev+0x2b4/0x81c 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 fs/read_write.c:1200 [inline] __arm64_sys_pwritev2+0x1bc/0x2cc fs/read_write.c:1200 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600