Hello, syzbot found the following issue on: HEAD commit: 74741a050b79 Add linux-next specific files for 20241107 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=13f15d87980000 kernel config: https://syzkaller.appspot.com/x/.config?x=d3ef0574c9dc8b00 dashboard link: https://syzkaller.appspot.com/bug?extid=d27edf9f96ae85939222 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8993ea1d09da/disk-74741a05.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dab7bc3c6e88/vmlinux-74741a05.xz kernel image: https://storage.googleapis.com/syzbot-assets/fda543ad532f/bzImage-74741a05.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d27edf9f96ae85939222@xxxxxxxxxxxxxxxxxxxxxxxxx ====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc6-next-20241107-syzkaller #0 Not tainted ------------------------------------------------------ syz.1.532/8903 is trying to acquire lock: ffff888060c52270 (&wnd->rw_lock){++++}-{4:4}, at: ntfs_look_for_free_space+0x100/0x690 fs/ntfs3/fsntfs.c:362 but task is already holding lock: ffff888059c0efd8 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x13d/0x200 fs/ntfs3/inode.c:852 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->file.run_lock#2){++++}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 down_read+0xb1/0xa40 kernel/locking/rwsem.c:1524 run_unpack_ex+0x55e/0x9e0 fs/ntfs3/run.c:1119 ntfs_read_mft fs/ntfs3/inode.c:401 [inline] ntfs_iget5+0x1f9a/0x37b0 fs/ntfs3/inode.c:537 ntfs_dir_emit fs/ntfs3/dir.c:335 [inline] ntfs_read_hdr+0x700/0xb80 fs/ntfs3/dir.c:383 ntfs_readdir+0x91f/0xf00 fs/ntfs3/dir.c:494 iterate_dir+0x571/0x800 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64+0x1e2/0x4b0 fs/readdir.c:389 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&wnd->rw_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 down_write_nested+0xa2/0x220 kernel/locking/rwsem.c:1693 ntfs_look_for_free_space+0x100/0x690 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1d6/0x990 fs/ntfs3/attrib.c:159 attr_set_size+0x2053/0x4300 fs/ntfs3/attrib.c:574 ntfs_set_size+0x161/0x200 fs/ntfs3/inode.c:854 ntfs_extend+0x1d1/0xad0 fs/ntfs3/file.c:409 ntfs_setattr+0x2aa/0xb80 fs/ntfs3/file.c:826 notify_change+0xbca/0xe90 fs/attr.c:552 do_truncate+0x220/0x310 fs/open.c:65 vfs_truncate+0x2e1/0x3b0 fs/open.c:111 do_sys_truncate+0xdb/0x190 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ni->file.run_lock#2); lock(&wnd->rw_lock); lock(&ni->file.run_lock#2); lock(&wnd->rw_lock); *** DEADLOCK *** 4 locks held by syz.1.532/8903: #0: ffff888060c54420 (sb_writers#17){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff888059c0f1c0 (&sb->s_type->i_mutex_key#29){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:817 [inline] #1: ffff888059c0f1c0 (&sb->s_type->i_mutex_key#29){+.+.}-{4:4}, at: do_truncate+0x20c/0x310 fs/open.c:63 #2: ffff888059c0ef28 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1110 [inline] #2: ffff888059c0ef28 (&ni->ni_lock#3/5){+.+.}-{4:4}, at: ntfs_set_size+0x12e/0x200 fs/ntfs3/inode.c:851 #3: ffff888059c0efd8 (&ni->file.run_lock#2){++++}-{4:4}, at: ntfs_set_size+0x13d/0x200 fs/ntfs3/inode.c:852 stack backtrace: CPU: 0 UID: 0 PID: 8903 Comm: syz.1.532 Not tainted 6.12.0-rc6-next-20241107-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 down_write_nested+0xa2/0x220 kernel/locking/rwsem.c:1693 ntfs_look_for_free_space+0x100/0x690 fs/ntfs3/fsntfs.c:362 attr_allocate_clusters+0x1d6/0x990 fs/ntfs3/attrib.c:159 attr_set_size+0x2053/0x4300 fs/ntfs3/attrib.c:574 ntfs_set_size+0x161/0x200 fs/ntfs3/inode.c:854 ntfs_extend+0x1d1/0xad0 fs/ntfs3/file.c:409 ntfs_setattr+0x2aa/0xb80 fs/ntfs3/file.c:826 notify_change+0xbca/0xe90 fs/attr.c:552 do_truncate+0x220/0x310 fs/open.c:65 vfs_truncate+0x2e1/0x3b0 fs/open.c:111 do_sys_truncate+0xdb/0x190 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f49bd97e719 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:00007f49be6ea038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f49bdb35f80 RCX: 00007f49bd97e719 RDX: 0000000000000000 RSI: 0000000000101000 RDI: 0000000020000080 RBP: 00007f49bd9f139e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f49bdb35f80 R15: 00007fffc9d8ce08 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
