syzbot has found a reproducer for the following issue on: HEAD commit: 610a9b8f49fb Linux 6.7-rc8 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16d7c48de80000 kernel config: https://syzkaller.appspot.com/x/.config?x=247b5a935d307ee5 dashboard link: https://syzkaller.appspot.com/bug?extid=41a88b825a315aac2254 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1552fe19e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1419bcade80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e174ec82158f/disk-610a9b8f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4bed5e1c1c26/vmlinux-610a9b8f.xz kernel image: https://storage.googleapis.com/syzbot-assets/4fd13b65ecb5/bzImage-610a9b8f.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/19a994dad52e/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/8c8468d1fd79/mount_1.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+41a88b825a315aac2254@xxxxxxxxxxxxxxxxxxxxxxxxx loop0: detected capacity change from 0 to 64 ============================================ WARNING: possible recursive locking detected 6.7.0-rc8-syzkaller #0 Not tainted -------------------------------------------- syz-executor279/5059 is trying to acquire lock: ffff888079c100f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397 but task is already holding lock: ffff888079c10778 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&HFS_I(tree->inode)->extents_lock); lock(&HFS_I(tree->inode)->extents_lock); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz-executor279/5059: #0: ffff88807a160418 (sb_writers#9){.+.+}-{0:0}, at: open_last_lookups fs/namei.c:3535 [inline] #0: ffff88807a160418 (sb_writers#9){.+.+}-{0:0}, at: path_openat+0x19f6/0x2c50 fs/namei.c:3776 #1: ffff888079c10fa8 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #1: ffff888079c10fa8 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3543 [inline] #1: ffff888079c10fa8 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: path_openat+0x8bd/0x2c50 fs/namei.c:3776 #2: ffff88807a1640b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfs_find_init+0x1b6/0x220 fs/hfs/bfind.c:30 #3: ffff888079c10778 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397 #4: ffff88807a1620b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x17f/0x220 fs/hfs/bfind.c:33 stack backtrace: CPU: 0 PID: 5059 Comm: syz-executor279 Not tainted 6.7.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain kernel/locking/lockdep.c:3856 [inline] __lock_acquire+0x20f8/0x3b20 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:747 hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397 hfs_bmap_reserve+0x29c/0x370 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x3cb/0x520 fs/hfs/extent.c:121 __hfs_ext_cache_extent fs/hfs/extent.c:174 [inline] hfs_ext_read_extent+0x805/0x9d0 fs/hfs/extent.c:202 hfs_extend_file+0x4e0/0xb10 fs/hfs/extent.c:401 hfs_bmap_reserve+0x29c/0x370 fs/hfs/btree.c:234 hfs_cat_create+0x227/0x810 fs/hfs/catalog.c:104 hfs_create+0x67/0xe0 fs/hfs/dir.c:202 lookup_open.isra.0+0x1095/0x13b0 fs/namei.c:3477 open_last_lookups fs/namei.c:3546 [inline] path_openat+0x922/0x2c50 fs/namei.c:3776 do_filp_open+0x1de/0x430 fs/namei.c:3809 do_sys_openat2+0x176/0x1e0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1463 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f776291b759 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f77628d7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f77629a46c8 RCX: 00007f776291b759 RDX: 000000000000275a RSI: 0000000020000000 RDI: 00000000ffffff9c RBP: 00007f77629a46c0 R08: 00007f77629a46c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f77629a46cc R13: 0000000000000006 R14: 00007ffd59ba19f0 R15: 00007ffd59ba1ad8 </TASK> hfs: request for non-existent node 16777216 in B*Tree hfs: request for non-existent node 16777216 in B*Tree hfs: inconsistency in B*Tree (5,0,1,0,1) --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
