netlink: 12 bytes leftover after parsing attributes in process `syz.5.6598'. loop5: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.6598/27612 is trying to acquire lock: ffff8880539d10f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa7/0xc40 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff88803374df88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1f8/0x1ba0 fs/hfsplus/extents.c:453 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760 hfsplus_get_block+0x398/0x15d0 fs/hfsplus/extents.c:260 block_read_full_folio+0x29f/0x830 fs/buffer.c:2420 filemap_read_folio+0x117/0x380 mm/filemap.c:2444 do_read_cache_folio+0x350/0x590 mm/filemap.c:4036 do_read_cache_page mm/filemap.c:4102 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:4111 read_mapping_page include/linux/pagemap.h:993 [inline] hfsplus_block_allocate+0xf3/0xc40 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xa9a/0x1ba0 fs/hfsplus/extents.c:464 hfsplus_get_block+0x40a/0x15d0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145 block_write_begin fs/buffer.c:2256 [inline] cont_write_begin+0x789/0xb50 fs/buffer.c:2594 hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48 generic_perform_write+0x2c5/0x900 mm/filemap.c:4254 generic_file_write_iter+0x117/0x550 mm/filemap.c:4397 __kernel_write_iter+0x428/0x910 fs/read_write.c:619 __kernel_write+0xef/0x150 fs/read_write.c:639 __dump_emit+0x206/0x310 fs/coredump.c:1220 elf_core_dump+0x2a87/0x3960 fs/binfmt_elf.c:2063 coredump_write+0x116c/0x1900 fs/coredump.c:1049 vfs_coredump+0x1db5/0x2a60 fs/coredump.c:1170 get_signal+0x1108/0x1340 kernel/signal.c:3019 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->alloc_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760 hfsplus_block_allocate+0xa7/0xc40 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xa9a/0x1ba0 fs/hfsplus/extents.c:464 hfsplus_bmap_reserve+0x122/0x500 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x18e/0x1120 fs/hfsplus/catalog.c:272 hfsplus_fill_super+0x12f5/0x1b50 fs/hfsplus/super.c:580 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1698 vfs_get_tree+0x92/0x2b0 fs/super.c:1758 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3642 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3718 do_mount fs/namespace.c:4041 [inline] __do_sys_mount fs/namespace.c:4229 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4206 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 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 *** 4 locks held by syz.5.6598/27612: #0: ffff8880308e00e0 (&type->s_umount_key#112/1){+.+.}-{4:4}, at: alloc_super+0x1bb/0x930 fs/super.c:344 #1: ffff8880539d1198 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_fill_super+0x1278/0x1b50 fs/hfsplus/super.c:573 #2: ffff888027d200b0 (&tree->tree_lock#2){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x290 fs/hfsplus/bfind.c:28 #3: ffff88803374df88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1f8/0x1ba0 fs/hfsplus/extents.c:453 stack backtrace: CPU: 0 UID: 0 PID: 27612 Comm: syz.5.6598 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760 hfsplus_block_allocate+0xa7/0xc40 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xa9a/0x1ba0 fs/hfsplus/extents.c:464 hfsplus_bmap_reserve+0x122/0x500 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x18e/0x1120 fs/hfsplus/catalog.c:272 hfsplus_fill_super+0x12f5/0x1b50 fs/hfsplus/super.c:580 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1698 vfs_get_tree+0x92/0x2b0 fs/super.c:1758 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3642 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3718 do_mount fs/namespace.c:4041 [inline] __do_sys_mount fs/namespace.c:4229 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4206 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5eb2190eea 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:00007f5eb3012e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f5eb3012ef0 RCX: 00007f5eb2190eea RDX: 0000200000000000 RSI: 0000200000000100 RDI: 00007f5eb3012eb0 RBP: 0000200000000000 R08: 00007f5eb3012ef0 R09: 000000000180000c R10: 000000000180000c R11: 0000000000000246 R12: 0000200000000100 R13: 00007f5eb3012eb0 R14: 00000000000006eb R15: 0000200000000300