loop1: detected capacity change from 0 to 1024 hfsplus: request for non-existent node 16777217 in B*Tree hfsplus: request for non-existent node 16777217 in B*Tree ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.409/8444 is trying to acquire lock: ffff88803c6740e8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa9/0xd30 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff888028d31538 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21c/0x1df0 fs/hfsplus/extents.c:457 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/rtmutex_api.c:561 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:580 hfsplus_get_block+0x391/0x1610 fs/hfsplus/extents.c:264 block_read_full_folio+0x29f/0x810 fs/buffer.c:2308 filemap_read_folio+0x12c/0x3a0 mm/filemap.c:2520 do_read_cache_folio+0x2bf/0x560 mm/filemap.c:4156 do_read_cache_page mm/filemap.c:4222 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:4231 read_mapping_page include/linux/pagemap.h:1009 [inline] hfsplus_block_allocate+0xf7/0xd30 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xb77/0x1df0 fs/hfsplus/extents.c:468 hfsplus_get_block+0x41f/0x1610 fs/hfsplus/extents.c:249 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2030 block_write_begin fs/buffer.c:2144 [inline] cont_write_begin+0x71b/0xac0 fs/buffer.c:2506 hfsplus_write_begin+0x126/0x1e0 fs/hfsplus/inode.c:56 cont_expand_zero fs/buffer.c:2434 [inline] cont_write_begin+0x2d6/0xac0 fs/buffer.c:2496 hfsplus_write_begin+0x126/0x1e0 fs/hfsplus/inode.c:56 generic_perform_write+0x2ad/0x8b0 mm/filemap.c:4374 generic_file_write_iter+0xaf/0x330 mm/filemap.c:4517 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61e/0xbb0 fs/read_write.c:687 ksys_pwrite64 fs/read_write.c:794 [inline] __do_sys_pwrite64 fs/read_write.c:802 [inline] __se_sys_pwrite64 fs/read_write.c:799 [inline] __x64_sys_pwrite64+0x199/0x230 fs/read_write.c:799 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->alloc_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 __mutex_lock_common kernel/locking/rtmutex_api.c:561 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:580 hfsplus_block_allocate+0xa9/0xd30 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xb77/0x1df0 fs/hfsplus/extents.c:468 hfsplus_bmap_reserve+0x170/0x590 fs/hfsplus/btree.c:512 hfsplus_create_attr+0x1ce/0x3a0 fs/hfsplus/attributes.c:288 __hfsplus_setxattr+0x706/0x2800 fs/hfsplus/xattr.c:453 hfsplus_initxattrs+0x1ae/0x280 fs/hfsplus/xattr_security.c:59 security_inode_init_security+0x29b/0x3e0 security/security.c:1370 hfsplus_fill_super+0x1328/0x1ab0 fs/hfsplus/super.c:635 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1873 vfs_get_tree+0x92/0x2a0 fs/super.c:1933 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); *** DEADLOCK *** locks held by syz.1.409/8444: 5, last CPU#0: #0: ffff8880222880e0 (&type->s_umount_key#62/1){+.+.}-{4:4}, at: alloc_super fs/super.c:351 [inline] #0: ffff8880222880e0 (&type->s_umount_key#62/1){+.+.}-{4:4}, at: sget_fc+0x97c/0x1a60 fs/super.c:875 #1: ffff88803c674178 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_fill_super+0x11ad/0x1ab0 fs/hfsplus/super.c:621 #2: ffff88803fff80a0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x179/0x2e0 fs/hfsplus/bfind.c:29 #3: ffff88802873c0a0 (&tree->tree_lock/2){+.+.}-{4:4}, at: hfsplus_find_init+0x179/0x2e0 fs/hfsplus/bfind.c:29 #4: ffff888028d31538 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21c/0x1df0 fs/hfsplus/extents.c:457 stack backtrace: CPU: 0 UID: 0 PID: 8444 Comm: syz.1.409 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219 check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 __mutex_lock_common kernel/locking/rtmutex_api.c:561 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:580 hfsplus_block_allocate+0xa9/0xd30 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xb77/0x1df0 fs/hfsplus/extents.c:468 hfsplus_bmap_reserve+0x170/0x590 fs/hfsplus/btree.c:512 hfsplus_create_attr+0x1ce/0x3a0 fs/hfsplus/attributes.c:288 __hfsplus_setxattr+0x706/0x2800 fs/hfsplus/xattr.c:453 hfsplus_initxattrs+0x1ae/0x280 fs/hfsplus/xattr_security.c:59 security_inode_init_security+0x29b/0x3e0 security/security.c:1370 hfsplus_fill_super+0x1328/0x1ab0 fs/hfsplus/super.c:635 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1873 vfs_get_tree+0x92/0x2a0 fs/super.c:1933 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6310d4f3ca 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:00007f630efa5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f630efa5ee0 RCX: 00007f6310d4f3ca RDX: 0000200000000000 RSI: 0000200000000400 RDI: 00007f630efa5ea0 RBP: 0000200000000000 R08: 00007f630efa5ee0 R09: 0000000000a08006 R10: 0000000000a08006 R11: 0000000000000246 R12: 0000200000000400 R13: 00007f630efa5ea0 R14: 000000000000068f R15: 0000200000000100 hfsplus: request for non-existent node 16777217 in B*Tree hfsplus: request for non-existent node 16777217 in B*Tree hfsplus: xattr search failed