loop0: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected 5.15.182-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.26/4914 is trying to acquire lock: ffff0000ceb410f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x88/0x7bc fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff0000d83a58c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x180/0x12f4 fs/hfsplus/extents.c:458 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+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 pagecache_write_begin+0xa0/0xc0 mm/filemap.c:3608 cont_expand_zero fs/buffer.c:2431 [inline] cont_write_begin+0x560/0x6dc fs/buffer.c:2461 hfsplus_write_begin+0xa8/0xf8 fs/hfsplus/inode.c:53 pagecache_write_begin+0xa0/0xc0 mm/filemap.c:3608 generic_cont_expand_simple+0xf0/0x1a0 fs/buffer.c:2362 hfsplus_setattr+0x148/0x258 fs/hfsplus/inode.c:261 notify_change+0xa08/0xcd8 fs/attr.c:505 do_truncate+0x178/0x1f0 fs/open.c:65 do_sys_ftruncate+0x284/0x31c fs/open.c:193 __do_sys_ftruncate fs/open.c:204 [inline] __se_sys_ftruncate fs/open.c:202 [inline] __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202 __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 (&sbi->alloc_mutex){+.+.}-{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_block_allocate+0x88/0x7bc fs/hfsplus/bitmap.c:35 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 pagecache_write_begin+0xa0/0xc0 mm/filemap.c:3608 cont_expand_zero fs/buffer.c:2398 [inline] cont_write_begin+0x220/0x6dc fs/buffer.c:2461 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 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1 do_iter_write+0x1c4/0x670 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_pwritev+0x1c8/0x2fc fs/read_write.c:1025 __do_sys_pwritev2 fs/read_write.c:1084 [inline] __se_sys_pwritev2 fs/read_write.c:1075 [inline] __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075 __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 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 *** 3 locks held by syz.0.26/4914: #0: ffff0000ec6ba460 (sb_writers#12){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:927 [inline] #0: ffff0000ec6ba460 (sb_writers#12){.+.+}-{0:0}, at: do_pwritev+0x1b4/0x2fc fs/read_write.c:1025 #1: ffff0000d83a5ac0 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff0000d83a5ac0 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: generic_file_write_iter+0x80/0x1b4 mm/filemap.c:3941 #2: ffff0000d83a58c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x180/0x12f4 fs/hfsplus/extents.c:458 stack backtrace: CPU: 1 PID: 4914 Comm: syz.0.26 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_block_allocate+0x88/0x7bc fs/hfsplus/bitmap.c:35 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 pagecache_write_begin+0xa0/0xc0 mm/filemap.c:3608 cont_expand_zero fs/buffer.c:2398 [inline] cont_write_begin+0x220/0x6dc fs/buffer.c:2461 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 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1 do_iter_write+0x1c4/0x670 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_pwritev+0x1c8/0x2fc fs/read_write.c:1025 __do_sys_pwritev2 fs/read_write.c:1084 [inline] __se_sys_pwritev2 fs/read_write.c:1075 [inline] __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075 __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