loop0: detected capacity change from 0 to 64 ====================================================== WARNING: possible circular locking dependency detected 6.1.115-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.624/6653 is trying to acquire lock: ffff888073e5e0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x16a/0x1e0 but task is already holding lock: ffff888020f7a7f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_get_block+0x26b/0xb60 fs/hfs/extent.c:365 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 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:3845 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3973 generic_file_write_iter+0xab/0x310 mm/filemap.c:4005 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x857/0xbc0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&tree->tree_lock/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 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:2489 do_read_cache_folio+0x2ee/0x810 mm/filemap.c:3626 do_read_cache_page+0x32/0x220 mm/filemap.c:3668 read_mapping_page include/linux/pagemap.h:791 [inline] __hfs_bnode_create+0x4b5/0x7b0 fs/hfs/bnode.c:290 hfs_bnode_find+0x240/0xf50 fs/hfs/bnode.c:335 hfs_brec_find+0x179/0x570 fs/hfs/bfind.c:126 hfs_brec_read+0x20/0x100 fs/hfs/bfind.c:165 hfs_cat_find_brec+0x151/0x470 fs/hfs/catalog.c:194 hfs_fill_super+0x10c1/0x1730 fs/hfs/super.c:419 mount_bdev+0x2c9/0x3f0 fs/super.c:1443 legacy_get_tree+0xeb/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x2ba/0xb40 fs/namespace.c:3056 do_mount fs/namespace.c:3399 [inline] __do_sys_mount fs/namespace.c:3607 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3584 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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/1); lock(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock/1); *** DEADLOCK *** 3 locks held by syz.0.624/6653: #0: ffff888077f8a0e0 (&type->s_umount_key#48/1){+.+.}-{3:3}, at: alloc_super+0x217/0x930 fs/super.c:228 #1: ffff888063dac0b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfs_find_init+0x16a/0x1e0 #2: ffff888020f7a7f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_get_block+0x26b/0xb60 fs/hfs/extent.c:365 stack backtrace: CPU: 1 PID: 6653 Comm: syz.0.624 Not tainted 6.1.115-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 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:2489 do_read_cache_folio+0x2ee/0x810 mm/filemap.c:3626 do_read_cache_page+0x32/0x220 mm/filemap.c:3668 read_mapping_page include/linux/pagemap.h:791 [inline] __hfs_bnode_create+0x4b5/0x7b0 fs/hfs/bnode.c:290 hfs_bnode_find+0x240/0xf50 fs/hfs/bnode.c:335 hfs_brec_find+0x179/0x570 fs/hfs/bfind.c:126 hfs_brec_read+0x20/0x100 fs/hfs/bfind.c:165 hfs_cat_find_brec+0x151/0x470 fs/hfs/catalog.c:194 hfs_fill_super+0x10c1/0x1730 fs/hfs/super.c:419 mount_bdev+0x2c9/0x3f0 fs/super.c:1443 legacy_get_tree+0xeb/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x2ba/0xb40 fs/namespace.c:3056 do_mount fs/namespace.c:3399 [inline] __do_sys_mount fs/namespace.c:3607 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3584 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f6fbef7feba Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f6fbfd71e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6fbfd71ef0 RCX: 00007f6fbef7feba RDX: 0000000020000080 RSI: 0000000020000040 RDI: 00007f6fbfd71eb0 RBP: 0000000020000080 R08: 00007f6fbfd71ef0 R09: 0000000000200040 R10: 0000000000200040 R11: 0000000000000246 R12: 0000000020000040 R13: 00007f6fbfd71eb0 R14: 0000000000000346 R15: 0000000020000300 hfs: get root inode failed