loop3: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected 6.1.84-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/10018 is trying to acquire lock: ffff0000d00070f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x90/0x818 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff0000ded69c08 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x198/0x14cc 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){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 hfsplus_get_block+0x2c4/0x1168 fs/hfsplus/extents.c:260 block_read_full_folio+0x2f4/0x98c fs/buffer.c:2271 hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28 filemap_read_folio+0x14c/0x39c mm/filemap.c:2461 do_read_cache_folio+0x24c/0x544 mm/filemap.c:3598 do_read_cache_page mm/filemap.c:3640 [inline] read_cache_page+0x6c/0x180 mm/filemap.c:3649 read_mapping_page include/linux/pagemap.h:791 [inline] hfsplus_block_allocate+0xe0/0x818 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0x770/0x14cc fs/hfsplus/extents.c:468 hfsplus_get_block+0x398/0x1168 fs/hfsplus/extents.c:245 __block_write_begin_int+0x340/0x13b4 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin fs/buffer.c:2102 [inline] cont_write_begin+0x5c0/0x7d8 fs/buffer.c:2456 hfsplus_write_begin+0x98/0xe4 fs/hfsplus/inode.c:52 page_symlink+0x278/0x4a4 fs/namei.c:5220 hfsplus_symlink+0xc0/0x224 fs/hfsplus/dir.c:449 vfs_symlink+0x244/0x3a8 fs/namei.c:4473 do_symlinkat+0x1bc/0x45c fs/namei.c:4502 __do_sys_symlinkat fs/namei.c:4519 [inline] __se_sys_symlinkat fs/namei.c:4516 [inline] __arm64_sys_symlinkat+0xa4/0xbc fs/namei.c:4516 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&sbi->alloc_mutex){+.+.}-{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+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 hfsplus_block_allocate+0x90/0x818 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0x770/0x14cc fs/hfsplus/extents.c:468 hfsplus_bmap_reserve+0xec/0x474 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x18c/0x1330 fs/hfsplus/catalog.c:272 hfsplus_fill_super+0xf60/0x166c fs/hfsplus/super.c:560 mount_bdev+0x274/0x370 fs/super.c:1432 hfsplus_mount+0x44/0x58 fs/hfsplus/super.c:641 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1562 do_new_mount+0x278/0x8fc fs/namespace.c:3051 path_mount+0x590/0xe5c fs/namespace.c:3381 do_mount fs/namespace.c:3394 [inline] __do_sys_mount fs/namespace.c:3602 [inline] __se_sys_mount fs/namespace.c:3579 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3579 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 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-executor.3/10018: #0: ffff0000d52000e0 (&type->s_umount_key#52/1){+.+.}-{3:3}, at: alloc_super+0x1b4/0x824 fs/super.c:228 #1: ffff0000d0007198 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_fill_super+0xf08/0x166c fs/hfsplus/super.c:553 #2: ffff0000d08680b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc #3: ffff0000ded69c08 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x198/0x14cc fs/hfsplus/extents.c:457 stack backtrace: CPU: 0 PID: 10018 Comm: syz-executor.3 Not tainted 6.1.84-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048 check_noncircular+0x2cc/0x378 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+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 hfsplus_block_allocate+0x90/0x818 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0x770/0x14cc fs/hfsplus/extents.c:468 hfsplus_bmap_reserve+0xec/0x474 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x18c/0x1330 fs/hfsplus/catalog.c:272 hfsplus_fill_super+0xf60/0x166c fs/hfsplus/super.c:560 mount_bdev+0x274/0x370 fs/super.c:1432 hfsplus_mount+0x44/0x58 fs/hfsplus/super.c:641 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1562 do_new_mount+0x278/0x8fc fs/namespace.c:3051 path_mount+0x590/0xe5c fs/namespace.c:3381 do_mount fs/namespace.c:3394 [inline] __do_sys_mount fs/namespace.c:3602 [inline] __se_sys_mount fs/namespace.c:3579 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3579 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585