loop0: detected capacity change from 0 to 64 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.1126/9256 is trying to acquire lock: ffff8880659460b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x15b/0x1d0 fs/hfs/bfind.c:-1 but task is already holding lock: ffff888057bb5bf8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_get_block+0x26b/0xc50 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}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 hfs_extend_file+0xfb/0x13f0 fs/hfs/extent.c:397 hfs_bmap_reserve+0x103/0x420 fs/hfs/btree.c:234 __hfs_ext_write_extent+0x1fa/0x470 fs/hfs/extent.c:121 __hfs_ext_cache_extent+0x6b/0x9b0 fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x39c/0x13f0 fs/hfs/extent.c:401 hfs_get_block+0x40f/0xc50 fs/hfs/extent.c:353 __block_write_begin_int+0x55d/0x1a80 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x96/0x1e0 fs/buffer.c:2102 cont_write_begin+0x5ea/0x800 fs/buffer.c:2456 hfs_write_begin+0x87/0xd0 fs/hfs/inode.c:58 generic_perform_write+0x2fa/0x5c0 mm/filemap.c:3862 __generic_file_write_iter+0x148/0x2a0 mm/filemap.c:3960 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2265 [inline] aio_write+0x545/0x780 fs/aio.c:1615 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x6cd/0x1380 fs/aio.c:2034 __do_sys_io_submit fs/aio.c:2093 [inline] __se_sys_io_submit+0x19d/0x310 fs/aio.c:2063 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&tree->tree_lock#2/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 hfs_find_init+0x15b/0x1d0 fs/hfs/bfind.c:-1 hfs_ext_read_extent fs/hfs/extent.c:200 [inline] hfs_get_block+0x553/0xc50 fs/hfs/extent.c:366 block_read_full_folio+0x3e6/0xf00 fs/buffer.c:2271 filemap_read_folio+0x16b/0x770 mm/filemap.c:2490 do_read_cache_folio+0x2a0/0x760 mm/filemap.c:3659 do_read_cache_page+0x32/0x220 mm/filemap.c:3701 read_mapping_page include/linux/pagemap.h:793 [inline] __hfs_bnode_create+0x4ad/0x7b0 fs/hfs/bnode.c:388 hfs_bnode_find+0x21e/0xd40 fs/hfs/bnode.c:433 hfs_brec_find+0x178/0x500 fs/hfs/bfind.c:132 hfs_brec_read+0x20/0x100 fs/hfs/bfind.c:171 hfs_cat_find_brec+0x174/0x3f0 fs/hfs/catalog.c:194 hfs_fill_super+0xff8/0x15b0 fs/hfs/super.c:419 mount_bdev+0x287/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 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#2/1); lock(&HFS_I(tree->inode)->extents_lock); lock(&tree->tree_lock#2/1); *** DEADLOCK *** 3 locks held by syz.0.1126/9256: #0: ffff8880534b40e0 (&type->s_umount_key#51/1){+.+.}-{3:3}, at: alloc_super+0x1fa/0x930 fs/super.c:228 #1: ffff888018e6c0b0 (&tree->tree_lock#2){+.+.}-{3:3}, at: hfs_find_init+0x15b/0x1d0 fs/hfs/bfind.c:-1 #2: ffff888057bb5bf8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_get_block+0x26b/0xc50 fs/hfs/extent.c:365 stack backtrace: CPU: 1 PID: 9256 Comm: syz.0.1126 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 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 kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 hfs_find_init+0x15b/0x1d0 fs/hfs/bfind.c:-1 hfs_ext_read_extent fs/hfs/extent.c:200 [inline] hfs_get_block+0x553/0xc50 fs/hfs/extent.c:366 block_read_full_folio+0x3e6/0xf00 fs/buffer.c:2271 filemap_read_folio+0x16b/0x770 mm/filemap.c:2490 do_read_cache_folio+0x2a0/0x760 mm/filemap.c:3659 do_read_cache_page+0x32/0x220 mm/filemap.c:3701 read_mapping_page include/linux/pagemap.h:793 [inline] __hfs_bnode_create+0x4ad/0x7b0 fs/hfs/bnode.c:388 hfs_bnode_find+0x21e/0xd40 fs/hfs/bnode.c:433 hfs_brec_find+0x178/0x500 fs/hfs/bfind.c:132 hfs_brec_read+0x20/0x100 fs/hfs/bfind.c:171 hfs_cat_find_brec+0x174/0x3f0 fs/hfs/catalog.c:194 hfs_fill_super+0xff8/0x15b0 fs/hfs/super.c:419 mount_bdev+0x287/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f625b99d20a Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f625c833e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f625c833ee0 RCX: 00007f625b99d20a RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f625c833ea0 RBP: 0000200000000180 R08: 00007f625c833ee0 R09: 0000000001000012 R10: 0000000001000012 R11: 0000000000000246 R12: 0000200000000000 R13: 00007f625c833ea0 R14: 000000000000031a R15: 00002000000003c0 hfs: get root inode failed