====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc2-syzkaller-00488-g6fea5fabd332 #0 Not tainted ------------------------------------------------------ syz.1.640/9251 is trying to acquire lock: ffff88807a7940b0 (&tree->tree_lock#2/1){+.+.}-{4:4}, at: hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33 but task is already holding lock: ffff888030560778 (&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:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 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 __block_write_begin_int+0x4f4/0x16d0 fs/buffer.c:2116 block_write_begin+0x9a/0x1d0 fs/buffer.c:2227 cont_write_begin+0x61b/0x950 fs/buffer.c:2566 hfs_write_begin+0x64/0x120 fs/hfs/inode.c:52 generic_perform_write+0x3d0/0x930 mm/filemap.c:4103 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4220 generic_file_write_iter+0xe1/0x3c0 mm/filemap.c:4246 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x5bd/0x1180 fs/read_write.c:684 ksys_write+0x12a/0x240 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 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:3701 open_last_lookups fs/namei.c:3800 [inline] path_openat+0x905/0x2d40 fs/namei.c:4036 do_filp_open+0x20b/0x470 fs/namei.c:4066 do_sys_openat2+0x11b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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.1.640/9251: #0: ffff8880488ca420 (sb_writers#29){.+.+}-{0:0}, at: open_last_lookups fs/namei.c:3789 [inline] #0: ffff8880488ca420 (sb_writers#29){.+.+}-{0:0}, at: path_openat+0x1f85/0x2d40 fs/namei.c:4036 #1: ffff888030560fa0 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff888030560fa0 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: open_last_lookups fs/namei.c:3797 [inline] #1: ffff888030560fa0 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: path_openat+0x15a5/0x2d40 fs/namei.c:4036 #2: ffff88807a7960b0 (&tree->tree_lock#2){+.+.}-{4:4}, at: hfs_find_init+0x1be/0x220 fs/hfs/bfind.c:30 #3: ffff888030560778 (&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: 9251 Comm: syz.1.640 Not tainted 6.15.0-rc2-syzkaller-00488-g6fea5fabd332 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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:2079 check_noncircular+0x14c/0x170 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+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 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:3701 open_last_lookups fs/namei.c:3800 [inline] path_openat+0x905/0x2d40 fs/namei.c:4036 do_filp_open+0x20b/0x470 fs/namei.c:4066 do_sys_openat2+0x11b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f06ad78e169 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:00007f06ae635038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f06ad9b5fa0 RCX: 00007f06ad78e169 RDX: 000000000000275a RSI: 0000200000000080 RDI: ffffffffffffff9c RBP: 00007f06ad810a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f06ad9b5fa0 R15: 00007ffce05adc88