loop3: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected 5.15.182-syzkaller #0 Not tainted ------------------------------------------------------ syz.3.2017/10211 is trying to acquire lock: ffff0000f7329c08 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x2cc/0x11c8 fs/hfsplus/extents.c:260 but task is already holding lock: ffff0000ce8ef8f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x88/0x7bc 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){+.+.}-{3:3}: __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 hfsplus_block_allocate+0x88/0x7bc fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0x738/0x12f4 fs/hfsplus/extents.c:469 hfsplus_bmap_reserve+0xe8/0x494 fs/hfsplus/btree.c:357 hfsplus_create_attr+0x190/0x548 fs/hfsplus/attributes.c:221 __hfsplus_setxattr+0x93c/0x1a9c fs/hfsplus/xattr.c:354 hfsplus_setxattr+0xb4/0xec fs/hfsplus/xattr.c:434 hfsplus_trusted_setxattr+0x54/0x6c fs/hfsplus/xattr_trusted.c:30 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x248/0x2ac fs/xattr.c:611 path_setxattr+0x12c/0x25c fs/xattr.c:630 __do_sys_lsetxattr fs/xattr.c:653 [inline] __se_sys_lsetxattr fs/xattr.c:649 [inline] __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:649 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #0 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 hfsplus_get_block+0x2cc/0x11c8 fs/hfsplus/extents.c:260 block_read_full_page+0x298/0xc40 fs/buffer.c:2290 hfsplus_readpage+0x28/0x38 fs/hfsplus/inode.c:28 do_read_cache_page+0x5f4/0x8f8 mm/filemap.c:-1 read_cache_page+0x68/0x88 mm/filemap.c:3574 read_mapping_page include/linux/pagemap.h:515 [inline] hfsplus_block_allocate+0xd8/0x7bc fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0x738/0x12f4 fs/hfsplus/extents.c:469 hfsplus_get_block+0x324/0x11c8 fs/hfsplus/extents.c:245 __block_write_begin_int+0x3e4/0x1588 fs/buffer.c:2012 __block_write_begin fs/buffer.c:2062 [inline] block_write_begin fs/buffer.c:2122 [inline] cont_write_begin+0x4e4/0x6dc fs/buffer.c:2471 hfsplus_write_begin+0xa8/0xf8 fs/hfsplus/inode.c:53 generic_perform_write+0x204/0x480 mm/filemap.c:3785 __generic_file_write_iter+0x23c/0x454 mm/filemap.c:3912 generic_file_write_iter+0xb0/0x1b4 mm/filemap.c:3944 __kernel_write+0x3e8/0x7ac fs/read_write.c:539 __dump_emit+0x1dc/0x2fc fs/coredump.c:875 dump_emit+0x288/0x364 fs/coredump.c:912 elf_core_dump+0x2044/0x2bac fs/binfmt_elf.c:2237 do_coredump+0x1478/0x21d8 fs/coredump.c:826 get_signal+0x4f4/0x1340 kernel/signal.c:2886 do_signal arch/arm64/kernel/signal.c:893 [inline] do_notify_resume+0x29c/0x3128 arch/arm64/kernel/signal.c:946 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_undef+0xfc/0x1ec arch/arm64/kernel/entry-common.c:574 el0t_64_sync_handler+0xa8/0xe4 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 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 *** 4 locks held by syz.3.2017/10211: #0: ffff0000da20e460 (sb_writers#15){.+.+}-{0:0}, at: do_coredump+0x1450/0x21d8 fs/coredump.c:825 #1: ffff0000f732d400 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff0000f732d400 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: generic_file_write_iter+0x80/0x1b4 mm/filemap.c:3941 #2: ffff0000f732d208 (&hip->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x180/0x12f4 fs/hfsplus/extents.c:458 #3: ffff0000ce8ef8f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x88/0x7bc fs/hfsplus/bitmap.c:35 stack backtrace: CPU: 1 PID: 10211 Comm: syz.3.2017 Not tainted 5.15.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2011 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 hfsplus_get_block+0x2cc/0x11c8 fs/hfsplus/extents.c:260 block_read_full_page+0x298/0xc40 fs/buffer.c:2290 hfsplus_readpage+0x28/0x38 fs/hfsplus/inode.c:28 do_read_cache_page+0x5f4/0x8f8 mm/filemap.c:-1 read_cache_page+0x68/0x88 mm/filemap.c:3574 read_mapping_page include/linux/pagemap.h:515 [inline] hfsplus_block_allocate+0xd8/0x7bc fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0x738/0x12f4 fs/hfsplus/extents.c:469 hfsplus_get_block+0x324/0x11c8 fs/hfsplus/extents.c:245 __block_write_begin_int+0x3e4/0x1588 fs/buffer.c:2012 __block_write_begin fs/buffer.c:2062 [inline] block_write_begin fs/buffer.c:2122 [inline] cont_write_begin+0x4e4/0x6dc fs/buffer.c:2471 hfsplus_write_begin+0xa8/0xf8 fs/hfsplus/inode.c:53 generic_perform_write+0x204/0x480 mm/filemap.c:3785 __generic_file_write_iter+0x23c/0x454 mm/filemap.c:3912 generic_file_write_iter+0xb0/0x1b4 mm/filemap.c:3944 __kernel_write+0x3e8/0x7ac fs/read_write.c:539 __dump_emit+0x1dc/0x2fc fs/coredump.c:875 dump_emit+0x288/0x364 fs/coredump.c:912 elf_core_dump+0x2044/0x2bac fs/binfmt_elf.c:2237 do_coredump+0x1478/0x21d8 fs/coredump.c:826 get_signal+0x4f4/0x1340 kernel/signal.c:2886 do_signal arch/arm64/kernel/signal.c:893 [inline] do_notify_resume+0x29c/0x3128 arch/arm64/kernel/signal.c:946 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_undef+0xfc/0x1ec arch/arm64/kernel/entry-common.c:574 el0t_64_sync_handler+0xa8/0xe4 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584