loop2: detected capacity change from 0 to 64 hfs: unable to locate alternate MDB hfs: continuing without an alternate MDB ====================================================== WARNING: possible circular locking dependency detected 6.2.0-syzkaller-12485-gf3a2439f20d9 #0 Not tainted ------------------------------------------------------ syz-executor.2/5553 is trying to acquire lock: ffff888057d40df8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xff/0x1440 fs/hfs/extent.c:397 but task is already holding lock: ffff88804dc8e0b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x16e/0x1f0 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&tree->tree_lock#2/1){+.+.}-{3:3}: lock_acquire+0x23e/0x630 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 hfs_find_init+0x16e/0x1f0 hfs_ext_read_extent fs/hfs/extent.c:200 [inline] hfs_extend_file+0x31b/0x1440 fs/hfs/extent.c:401 hfs_bmap_reserve+0xd9/0x3f0 fs/hfs/btree.c:234 hfs_cat_move+0x1bb/0x1050 fs/hfs/catalog.c:310 hfs_rename+0x246/0x320 fs/hfs/dir.c:299 vfs_rename+0xb1b/0xfa0 fs/namei.c:4772 do_renameat2+0xb9b/0x13c0 fs/namei.c:4923 __do_sys_rename fs/namei.c:4969 [inline] __se_sys_rename fs/namei.c:4967 [inline] __x64_sys_rename+0x86/0x90 fs/namei.c:4967 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x23e/0x630 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 hfs_extend_file+0xff/0x1440 fs/hfs/extent.c:397 hfs_bmap_reserve+0xd9/0x3f0 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x22e/0x4f0 fs/hfs/extent.c:121 __hfs_ext_cache_extent+0x6a/0x990 fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x344/0x1440 fs/hfs/extent.c:401 hfs_get_block+0x3e4/0xb60 fs/hfs/extent.c:353 __block_write_begin_int+0x548/0x1a50 fs/buffer.c:2034 __block_write_begin fs/buffer.c:2084 [inline] block_write_begin+0x9c/0x1f0 fs/buffer.c:2145 cont_write_begin+0x643/0x880 fs/buffer.c:2504 hfs_write_begin+0x8a/0xd0 fs/hfs/inode.c:58 generic_perform_write+0x300/0x5e0 mm/filemap.c:3926 __generic_file_write_iter+0x17a/0x400 mm/filemap.c:4054 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4086 call_write_iter include/linux/fs.h:1851 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7b2/0xbb0 fs/read_write.c:584 ksys_write+0x1a0/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&tree->tree_lock#2/1); lock(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock#2/1); lock(&HFS_I(tree->inode)->extents_lock); *** DEADLOCK *** 5 locks held by syz-executor.2/5553: #0: ffff88807b6dc5e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x254/0x2f0 fs/file.c:1046 #1: ffff888021386460 (sb_writers#20){.+.+}-{0:0}, at: vfs_write+0x26d/0xbb0 fs/read_write.c:580 #2: ffff888057d43028 (&sb->s_type->i_mutex_key#36){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #2: ffff888057d43028 (&sb->s_type->i_mutex_key#36){+.+.}-{3:3}, at: generic_file_write_iter+0x83/0x310 mm/filemap.c:4083 #3: ffff888057d42e78 (&HFS_I(inode)->extents_lock#2){+.+.}-{3:3}, at: hfs_extend_file+0xff/0x1440 fs/hfs/extent.c:397 #4: ffff88804dc8e0b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x16e/0x1f0 stack backtrace: CPU: 1 PID: 5553 Comm: syz-executor.2 Not tainted 6.2.0-syzkaller-12485-gf3a2439f20d9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2fe/0x3b0 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x23e/0x630 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 hfs_extend_file+0xff/0x1440 fs/hfs/extent.c:397 hfs_bmap_reserve+0xd9/0x3f0 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x22e/0x4f0 fs/hfs/extent.c:121 __hfs_ext_cache_extent+0x6a/0x990 fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x344/0x1440 fs/hfs/extent.c:401 hfs_get_block+0x3e4/0xb60 fs/hfs/extent.c:353 __block_write_begin_int+0x548/0x1a50 fs/buffer.c:2034 __block_write_begin fs/buffer.c:2084 [inline] block_write_begin+0x9c/0x1f0 fs/buffer.c:2145 cont_write_begin+0x643/0x880 fs/buffer.c:2504 hfs_write_begin+0x8a/0xd0 fs/hfs/inode.c:58 generic_perform_write+0x300/0x5e0 mm/filemap.c:3926 __generic_file_write_iter+0x17a/0x400 mm/filemap.c:4054 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4086 call_write_iter include/linux/fs.h:1851 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7b2/0xbb0 fs/read_write.c:584 ksys_write+0x1a0/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb3eb48c0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb3ec1d5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fb3eb5abf80 RCX: 00007fb3eb48c0f9 RDX: 00000000000ffe00 RSI: 0000000020004200 RDI: 0000000000000004 RBP: 00007fb3eb4e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdd271dc6f R14: 00007fb3ec1d5300 R15: 0000000000022000