====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc5-syzkaller-gc32f8dc5aaf9 #0 Not tainted ------------------------------------------------------ syz.3.348/8809 is trying to acquire lock: ffff0000e1a28e88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260 but task is already holding lock: ffff0000d8c370f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x88/0x70c fs/hfsplus/bitmap.c:35 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sbi->alloc_mutex){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2190 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 hfsplus_block_allocate+0x88/0x70c fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0x770/0x1388 fs/hfsplus/extents.c:469 hfsplus_get_block+0x314/0x1154 fs/hfsplus/extents.c:245 __block_write_begin_int+0x53c/0x15e8 fs/buffer.c:2151 block_write_begin fs/buffer.c:2262 [inline] cont_write_begin+0x62c/0x968 fs/buffer.c:2601 hfsplus_write_begin+0x7c/0xc4 fs/hfsplus/inode.c:46 cont_expand_zero fs/buffer.c:2528 [inline] cont_write_begin+0x26c/0x968 fs/buffer.c:2591 hfsplus_write_begin+0x7c/0xc4 fs/hfsplus/inode.c:46 generic_cont_expand_simple+0x12c/0x1fc fs/buffer.c:2492 hfsplus_setattr+0x140/0x24c fs/hfsplus/inode.c:258 notify_change+0x9a4/0xc50 fs/attr.c:552 do_truncate+0x178/0x1f0 fs/open.c:65 vfs_truncate+0x398/0x444 fs/open.c:115 do_sys_truncate+0xe4/0x1a8 fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __arm64_sys_truncate+0x5c/0x74 fs/open.c:148 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #0 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 __mutex_lock_common+0x1d0/0x2190 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260 block_read_full_folio+0x2ec/0x824 fs/buffer.c:2427 hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2401 do_read_cache_folio+0x368/0x5c0 mm/filemap.c:3885 do_read_cache_page mm/filemap.c:3951 [inline] read_cache_page+0x6c/0x160 mm/filemap.c:3960 read_mapping_page include/linux/pagemap.h:989 [inline] hfsplus_block_allocate+0xdc/0x70c fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0x770/0x1388 fs/hfsplus/extents.c:469 hfsplus_get_block+0x314/0x1154 fs/hfsplus/extents.c:245 __block_write_begin_int+0x53c/0x15e8 fs/buffer.c:2151 block_write_begin fs/buffer.c:2262 [inline] cont_write_begin+0x62c/0x968 fs/buffer.c:2601 hfsplus_write_begin+0x7c/0xc4 fs/hfsplus/inode.c:46 generic_perform_write+0x23c/0x79c mm/filemap.c:4103 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4220 generic_file_write_iter+0x104/0x470 mm/filemap.c:4246 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x62c/0x97c fs/read_write.c:684 ksys_write+0x120/0x210 fs/read_write.c:736 __do_sys_write fs/read_write.c:747 [inline] __se_sys_write fs/read_write.c:744 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:744 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->alloc_mutex); lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); lock(&HFSPLUS_I(inode)->extents_lock); *** DEADLOCK *** 5 locks held by syz.3.348/8809: #0: ffff0000ce96d438 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x1fc/0x2a0 fs/file.c:1213 #1: ffff0000dc7ee420 (sb_writers#27){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline] #1: ffff0000dc7ee420 (sb_writers#27){.+.+}-{0:0}, at: vfs_write+0x244/0x97c fs/read_write.c:680 #2: ffff0000e1a29df8 (&sb->s_type->i_mutex_key#37){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #2: ffff0000e1a29df8 (&sb->s_type->i_mutex_key#37){+.+.}-{4:4}, at: generic_file_write_iter+0xd4/0x470 mm/filemap.c:4243 #3: ffff0000e1a29c08 (&hip->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1b8/0x1388 fs/hfsplus/extents.c:458 #4: ffff0000d8c370f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x88/0x70c fs/hfsplus/bitmap.c:35 stack backtrace: CPU: 0 UID: 0 PID: 8809 Comm: syz.3.348 Not tainted 6.15.0-rc5-syzkaller-gc32f8dc5aaf9 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2079 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 __mutex_lock_common+0x1d0/0x2190 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260 block_read_full_folio+0x2ec/0x824 fs/buffer.c:2427 hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2401 do_read_cache_folio+0x368/0x5c0 mm/filemap.c:3885 do_read_cache_page mm/filemap.c:3951 [inline] read_cache_page+0x6c/0x160 mm/filemap.c:3960 read_mapping_page include/linux/pagemap.h:989 [inline] hfsplus_block_allocate+0xdc/0x70c fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0x770/0x1388 fs/hfsplus/extents.c:469 hfsplus_get_block+0x314/0x1154 fs/hfsplus/extents.c:245 __block_write_begin_int+0x53c/0x15e8 fs/buffer.c:2151 block_write_begin fs/buffer.c:2262 [inline] cont_write_begin+0x62c/0x968 fs/buffer.c:2601 hfsplus_write_begin+0x7c/0xc4 fs/hfsplus/inode.c:46 generic_perform_write+0x23c/0x79c mm/filemap.c:4103 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4220 generic_file_write_iter+0x104/0x470 mm/filemap.c:4246 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x62c/0x97c fs/read_write.c:684 ksys_write+0x120/0x210 fs/read_write.c:736 __do_sys_write fs/read_write.c:747 [inline] __se_sys_write fs/read_write.c:744 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:744 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600