loop2: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.195/7010 is trying to acquire lock: ffff88801bb9a8f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x9d/0x8e0 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff88801cebbdc8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1fd/0x1990 fs/hfsplus/extents.c:455 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 hfsplus_get_block+0x39f/0x1530 fs/hfsplus/extents.c:260 block_read_full_folio+0x42e/0xf40 fs/buffer.c:2406 filemap_read_folio+0x167/0x760 mm/filemap.c:2420 do_read_cache_folio+0x470/0x7e0 mm/filemap.c:3804 do_read_cache_page+0x32/0x250 mm/filemap.c:3870 read_mapping_page include/linux/pagemap.h:892 [inline] hfsplus_block_allocate+0xff/0x8e0 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xae4/0x1990 fs/hfsplus/extents.c:466 hfsplus_get_block+0x412/0x1530 fs/hfsplus/extents.c:245 __block_write_begin_int+0x566/0x1ad0 fs/buffer.c:2124 __block_write_begin fs/buffer.c:2173 [inline] block_write_begin+0x9a/0x1e0 fs/buffer.c:2234 cont_write_begin+0x5c8/0x7e0 fs/buffer.c:2591 hfsplus_write_begin+0x8b/0xd0 fs/hfsplus/inode.c:52 generic_perform_write+0x2fb/0x5b0 mm/filemap.c:4031 generic_file_write_iter+0xaf/0x2e0 mm/filemap.c:4152 __kernel_write_iter+0x274/0x670 fs/read_write.c:517 __kernel_write+0xf0/0x140 fs/read_write.c:537 __dump_emit+0x206/0x310 fs/coredump.c:882 elf_core_dump+0x28fe/0x36e0 fs/binfmt_elf.c:2136 do_coredump+0x1755/0x2480 fs/coredump.c:833 get_signal+0x1133/0x1400 kernel/signal.c:2888 arch_do_signal_or_restart+0x9c/0x7b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:315 exc_page_fault+0x8f/0x110 arch/x86/mm/fault.c:1524 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 -> #0 (&sbi->alloc_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 hfsplus_block_allocate+0x9d/0x8e0 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xae4/0x1990 fs/hfsplus/extents.c:466 hfsplus_bmap_reserve+0x122/0x500 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x184/0xff0 fs/hfsplus/catalog.c:272 hfsplus_fill_super+0x12fa/0x1b90 fs/hfsplus/super.c:573 mount_bdev+0x22b/0x2d0 fs/super.c:1643 legacy_get_tree+0xea/0x180 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3386 do_mount fs/namespace.c:3726 [inline] __do_sys_mount fs/namespace.c:3935 [inline] __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 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(&HFSPLUS_I(inode)->extents_lock ); lock(&sbi->alloc_mutex); lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); *** DEADLOCK *** 4 locks held by syz.2.195/7010: #0: ffff8880568880e0 (&type->s_umount_key#61){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880568880e0 (&type->s_umount_key#61){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880568880e0 (&type->s_umount_key#61){+.+.}-{3:3}, at: mount_bdev+0x1e8/0x2d0 fs/super.c:1641 #1: ffff88801bb9a998 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_fill_super+0x128a/0x1b90 fs/hfsplus/super.c:566 #2: ffff888056dfa0b0 (&tree->tree_lock#2){+.+.}-{3:3}, at: hfsplus_find_init+0x154/0x1d0 fs/hfsplus/bfind.c:28 #3: ffff88801cebbdc8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1fd/0x1990 fs/hfsplus/extents.c:455 stack backtrace: CPU: 1 PID: 7010 Comm: syz.2.195 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 hfsplus_block_allocate+0x9d/0x8e0 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xae4/0x1990 fs/hfsplus/extents.c:466 hfsplus_bmap_reserve+0x122/0x500 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x184/0xff0 fs/hfsplus/catalog.c:272 hfsplus_fill_super+0x12fa/0x1b90 fs/hfsplus/super.c:573 mount_bdev+0x22b/0x2d0 fs/super.c:1643 legacy_get_tree+0xea/0x180 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3386 do_mount fs/namespace.c:3726 [inline] __do_sys_mount fs/namespace.c:3935 [inline] __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f4040d90eea 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:00007f4041cbae68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4041cbaef0 RCX: 00007f4040d90eea RDX: 0000200000000100 RSI: 0000200000002900 RDI: 00007f4041cbaeb0 RBP: 0000200000000100 R08: 00007f4041cbaef0 R09: 0000000002000010 R10: 0000000002000010 R11: 0000000000000246 R12: 0000200000002900 R13: 00007f4041cbaeb0 R14: 00000000000006d0 R15: 00002000000022c0 hfsplus: xattr searching failed