loop4: detected capacity change from 0 to 64 ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc6-syzkaller #0 Not tainted ------------------------------------------------------ syz.4.1494/12107 is trying to acquire lock: ffff88806a44a0b0 (&tree->tree_lock#2/1){+.+.}-{4:4}, at: hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33 but task is already holding lock: ffff88807fba2178 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xa1/0xb10 fs/hfs/extent.c:397 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 hfs_extend_file+0xa1/0xb10 fs/hfs/extent.c:397 hfs_bmap_reserve+0x2a2/0x390 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x3cf/0x520 fs/hfs/extent.c:121 __hfs_ext_cache_extent fs/hfs/extent.c:174 [inline] hfs_ext_read_extent+0x807/0x9e0 fs/hfs/extent.c:202 hfs_extend_file+0x4e2/0xb10 fs/hfs/extent.c:401 hfs_get_block+0x17f/0x830 fs/hfs/extent.c:353 get_more_blocks fs/direct-io.c:648 [inline] do_direct_IO fs/direct-io.c:936 [inline] __blockdev_direct_IO+0x26b8/0x4180 fs/direct-io.c:1243 blockdev_direct_IO include/linux/fs.h:3477 [inline] hfs_direct_IO+0x106/0x2c0 fs/hfs/inode.c:132 generic_file_direct_write+0x19a/0x410 mm/filemap.c:4046 __generic_file_write_iter+0x11b/0x240 mm/filemap.c:4215 generic_file_write_iter+0xe1/0x3c0 mm/filemap.c:4255 do_iter_readv_writev+0x657/0x950 fs/read_write.c:827 vfs_writev+0x35f/0xde0 fs/read_write.c:1057 do_writev+0x132/0x340 fs/read_write.c:1103 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 (&tree->tree_lock#2/1){+.+.}-{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 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33 hfs_ext_read_extent+0x19b/0x9e0 fs/hfs/extent.c:200 hfs_extend_file+0x4e2/0xb10 fs/hfs/extent.c:401 hfs_bmap_reserve+0x2a2/0x390 fs/hfs/btree.c:234 hfs_cat_create+0x229/0x820 fs/hfs/catalog.c:104 hfs_create+0x6b/0xf0 fs/hfs/dir.c:202 lookup_open.isra.0+0x11d3/0x1580 fs/namei.c:3717 open_last_lookups fs/namei.c:3816 [inline] path_openat+0x893/0x2cb0 fs/namei.c:4052 do_filp_open+0x20b/0x470 fs/namei.c:4082 do_sys_openat2+0x11b/0x1d0 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+0x174/0x210 fs/open.c:1463 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(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock#2/1); lock(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock#2/1); *** DEADLOCK *** 4 locks held by syz.4.1494/12107: #0: ffff888064dc2428 (sb_writers#33){.+.+}-{0:0}, at: open_last_lookups fs/namei.c:3805 [inline] #0: ffff888064dc2428 (sb_writers#33){.+.+}-{0:0}, at: path_openat+0x1f0f/0x2cb0 fs/namei.c:4052 #1: ffff88807fba29a0 (&type->i_mutex_dir_key#25){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #1: ffff88807fba29a0 (&type->i_mutex_dir_key#25){+.+.}-{4:4}, at: open_last_lookups fs/namei.c:3813 [inline] #1: ffff88807fba29a0 (&type->i_mutex_dir_key#25){+.+.}-{4:4}, at: path_openat+0x1534/0x2cb0 fs/namei.c:4052 #2: ffff88806a44c0b0 (&tree->tree_lock#2){+.+.}-{4:4}, at: hfs_find_init+0x1be/0x220 fs/hfs/bfind.c:30 #3: ffff88807fba2178 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xa1/0xb10 fs/hfs/extent.c:397 stack backtrace: CPU: 1 UID: 0 PID: 12107 Comm: syz.4.1494 Not tainted 6.16.0-rc6-syzkaller #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 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33 hfs_ext_read_extent+0x19b/0x9e0 fs/hfs/extent.c:200 hfs_extend_file+0x4e2/0xb10 fs/hfs/extent.c:401 hfs_bmap_reserve+0x2a2/0x390 fs/hfs/btree.c:234 hfs_cat_create+0x229/0x820 fs/hfs/catalog.c:104 hfs_create+0x6b/0xf0 fs/hfs/dir.c:202 lookup_open.isra.0+0x11d3/0x1580 fs/namei.c:3717 open_last_lookups fs/namei.c:3816 [inline] path_openat+0x893/0x2cb0 fs/namei.c:4052 do_filp_open+0x20b/0x470 fs/namei.c:4082 do_sys_openat2+0x11b/0x1d0 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+0x174/0x210 fs/open.c:1463 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: 0033:0x7ff9b5d8e929 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:00007ff9b6ba5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007ff9b5fb5fa0 RCX: 00007ff9b5d8e929 RDX: 00000000001a10c1 RSI: 0000200000000140 RDI: ffffffffffffff9c RBP: 00007ff9b5e10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 9c37611dc13d0d83 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff9b5fb5fa0 R15: 00007ffde69ef2d8