loop9: detected capacity change from 0 to 4096 ====================================================== WARNING: possible circular locking dependency detected 6.6.94-syzkaller #0 Not tainted ------------------------------------------------------ syz.9.2898/13300 is trying to acquire lock: ffff888020dc3aa0 (&mm->mmap_lock){++++}-{3:3}, at: internal_get_user_pages_fast+0x204/0x2730 mm/gup.c:3195 but task is already holding lock: ffff88805a2c99d0 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:824 [inline] ffff88805a2c99d0 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: ntfs_file_write_iter+0x23e/0x700 fs/ntfs3/file.c:1093 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}: down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] ntfs_file_mmap+0x54c/0x730 fs/ntfs3/file.c:302 call_mmap include/linux/fs.h:2023 [inline] mmap_file mm/internal.h:98 [inline] __mmap_region mm/mmap.c:2780 [inline] mmap_region+0xe57/0x1f80 mm/mmap.c:2931 do_mmap+0x8d1/0xfd0 mm/mmap.c:1381 vm_mmap_pgoff+0x1c0/0x400 mm/util.c:556 ksys_mmap_pgoff+0x520/0x700 mm/mmap.c:1427 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 internal_get_user_pages_fast+0x21d/0x2730 mm/gup.c:3195 iov_iter_extract_user_pages lib/iov_iter.c:1785 [inline] iov_iter_extract_pages+0x393/0x790 lib/iov_iter.c:1848 dio_refill_pages fs/direct-io.c:173 [inline] dio_get_page fs/direct-io.c:214 [inline] do_direct_IO fs/direct-io.c:914 [inline] __blockdev_direct_IO+0x10d6/0x3420 fs/direct-io.c:1248 blockdev_direct_IO include/linux/fs.h:3047 [inline] ntfs_direct_IO+0x196/0x3a0 fs/ntfs3/inode.c:801 generic_file_direct_write+0x1d4/0x3e0 mm/filemap.c:3941 __generic_file_write_iter+0x11b/0x230 mm/filemap.c:4097 ntfs_file_write_iter+0x61c/0x700 fs/ntfs3/file.c:1120 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x79a/0xc70 fs/read_write.c:860 vfs_writev fs/read_write.c:933 [inline] do_pwritev+0x205/0x340 fs/read_write.c:1030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#23); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#23); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz.9.2898/13300: #0: ffff88807eab2418 (sb_writers#14){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:932 [inline] #0: ffff88807eab2418 (sb_writers#14){.+.+}-{0:0}, at: do_pwritev+0x1f3/0x340 fs/read_write.c:1030 #1: ffff88805a2c99d0 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:824 [inline] #1: ffff88805a2c99d0 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: ntfs_file_write_iter+0x23e/0x700 fs/ntfs3/file.c:1093 stack backtrace: CPU: 0 PID: 13300 Comm: syz.9.2898 Not tainted 6.6.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 internal_get_user_pages_fast+0x21d/0x2730 mm/gup.c:3195 iov_iter_extract_user_pages lib/iov_iter.c:1785 [inline] iov_iter_extract_pages+0x393/0x790 lib/iov_iter.c:1848 dio_refill_pages fs/direct-io.c:173 [inline] dio_get_page fs/direct-io.c:214 [inline] do_direct_IO fs/direct-io.c:914 [inline] __blockdev_direct_IO+0x10d6/0x3420 fs/direct-io.c:1248 blockdev_direct_IO include/linux/fs.h:3047 [inline] ntfs_direct_IO+0x196/0x3a0 fs/ntfs3/inode.c:801 generic_file_direct_write+0x1d4/0x3e0 mm/filemap.c:3941 __generic_file_write_iter+0x11b/0x230 mm/filemap.c:4097 ntfs_file_write_iter+0x61c/0x700 fs/ntfs3/file.c:1120 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x79a/0xc70 fs/read_write.c:860 vfs_writev fs/read_write.c:933 [inline] do_pwritev+0x205/0x340 fs/read_write.c:1030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fa58d58e929 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:00007fa58e33a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007fa58d7b5fa0 RCX: 00007fa58d58e929 RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000004 RBP: 00007fa58d610b39 R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000002000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa58d7b5fa0 R15: 00007fff8f0ccf08