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 6.1.34-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/30768 is trying to acquire lock: ffff888082f8a7f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xfb/0x1440 fs/hfs/extent.c:397 but task is already holding lock: ffff8880778ba0b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x16a/0x1e0 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+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d4/0x2520 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 hfs_find_init+0x16a/0x1e0 hfs_ext_read_extent fs/hfs/extent.c:200 [inline] hfs_get_block+0x4f0/0xb60 fs/hfs/extent.c:366 block_read_full_folio+0x403/0xf60 fs/buffer.c:2271 filemap_read_folio+0x199/0x780 mm/filemap.c:2407 do_read_cache_folio+0x2ee/0x810 mm/filemap.c:3535 do_read_cache_page+0x32/0x220 mm/filemap.c:3577 read_mapping_page include/linux/pagemap.h:756 [inline] hfs_btree_open+0x507/0xf20 fs/hfs/btree.c:78 hfs_mdb_get+0x14c3/0x21b0 fs/hfs/mdb.c:204 hfs_fill_super+0x100c/0x1730 fs/hfs/super.c:406 mount_bdev+0x2c9/0x3f0 fs/super.c:1423 legacy_get_tree+0xeb/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1553 do_new_mount+0x28b/0xae0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 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+0x1667/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d4/0x2520 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 hfs_extend_file+0xfb/0x1440 fs/hfs/extent.c:397 hfs_bmap_reserve+0xd5/0x3f0 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+0x340/0x1440 fs/hfs/extent.c:401 hfs_get_block+0x3e0/0xb60 fs/hfs/extent.c:353 __block_write_begin_int+0x544/0x1a30 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x98/0x1f0 fs/buffer.c:2102 cont_write_begin+0x63f/0x880 fs/buffer.c:2456 hfs_write_begin+0x86/0xd0 fs/hfs/inode.c:58 generic_perform_write+0x2fc/0x5e0 mm/filemap.c:3754 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3882 generic_file_write_iter+0xab/0x310 mm/filemap.c:3914 call_write_iter include/linux/fs.h:2205 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7ae/0xba0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 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.2/30768: #0: ffff888073a32868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x250/0x2f0 fs/file.c:1047 #1: ffff88807d26e460 (sb_writers#33){.+.+}-{0:0}, at: vfs_write+0x269/0xba0 fs/read_write.c:580 #2: ffff888082f8e428 (&sb->s_type->i_mutex_key#41){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #2: ffff888082f8e428 (&sb->s_type->i_mutex_key#41){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x310 mm/filemap.c:3911 #3: ffff888082f8e278 (&HFS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xfb/0x1440 fs/hfs/extent.c:397 #4: ffff8880778ba0b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x16a/0x1e0 stack backtrace: CPU: 1 PID: 30768 Comm: syz-executor.2 Not tainted 6.1.34-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/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+0x1667/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d4/0x2520 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 hfs_extend_file+0xfb/0x1440 fs/hfs/extent.c:397 hfs_bmap_reserve+0xd5/0x3f0 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+0x340/0x1440 fs/hfs/extent.c:401 hfs_get_block+0x3e0/0xb60 fs/hfs/extent.c:353 __block_write_begin_int+0x544/0x1a30 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x98/0x1f0 fs/buffer.c:2102 cont_write_begin+0x63f/0x880 fs/buffer.c:2456 hfs_write_begin+0x86/0xd0 fs/hfs/inode.c:58 generic_perform_write+0x2fc/0x5e0 mm/filemap.c:3754 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3882 generic_file_write_iter+0xab/0x310 mm/filemap.c:3914 call_write_iter include/linux/fs.h:2205 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7ae/0xba0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2d1928c389 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:00007f2d19f9f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f2d193abf80 RCX: 00007f2d1928c389 RDX: 00000000001ff7ff RSI: 0000000020004200 RDI: 0000000000000004 RBP: 00007f2d192d7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffed31c6bff R14: 00007f2d19f9f300 R15: 0000000000022000