====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc7-syzkaller-g707081b61156 #0 Not tainted ------------------------------------------------------ syz-executor.0/9705 is trying to acquire lock: ffff0000c6318190 (&mm->mmap_lock){++++}-{3:3} , at: __might_fault+0x9c/0x124 mm/memory.c:6079 but task is already holding lock: ffff0000d08aa0b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&tree->tree_lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 hfsplus_file_truncate+0x62c/0x9b8 fs/hfsplus/extents.c:609 hfsplus_file_release+0xe8/0x3a0 fs/hfsplus/inode.c:234 __fput+0x30c/0x738 fs/file_table.c:376 ____fput+0x20/0x30 fs/file_table.c:404 task_work_run+0x230/0x2e0 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x618/0x1f64 kernel/exit.c:871 do_group_exit+0x194/0x22c kernel/exit.c:1020 __do_sys_exit_group kernel/exit.c:1031 [inline] __se_sys_exit_group kernel/exit.c:1029 [inline] pid_child_should_wake+0x0/0x1dc kernel/exit.c:1029 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 -> #2 (&hip->extents_lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 hfsplus_get_block+0x2c4/0x1168 fs/hfsplus/extents.c:260 block_read_full_folio+0x3d4/0xc58 fs/buffer.c:2382 hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28 read_pages+0x4c0/0x6a0 mm/readahead.c:180 page_cache_ra_unbounded+0x46c/0x58c mm/readahead.c:269 do_page_cache_ra mm/readahead.c:299 [inline] page_cache_ra_order+0x7c0/0x950 mm/readahead.c:544 ondemand_readahead+0x600/0xaf4 mm/readahead.c:666 page_cache_async_ra+0x1b0/0x1cc mm/readahead.c:715 do_async_mmap_readahead mm/filemap.c:3181 [inline] filemap_fault+0x4a4/0xff4 mm/filemap.c:3235 __do_fault+0x11c/0x374 mm/memory.c:4396 do_read_fault mm/memory.c:4758 [inline] do_fault mm/memory.c:4888 [inline] do_pte_missing mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:5164 [inline] __handle_mm_fault mm/memory.c:5305 [inline] handle_mm_fault+0x3a80/0x546c mm/memory.c:5470 __do_page_fault arch/arm64/mm/fault.c:505 [inline] do_page_fault+0x4f8/0xa64 arch/arm64/mm/fault.c:620 do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:704 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:840 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:432 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:492 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:593 do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] strncpy_from_user+0x224/0x54c lib/strncpy_from_user.c:139 getname_flags+0x104/0x48c fs/namei.c:151 getname+0x28/0x38 fs/namei.c:219 do_sys_openat2+0xd0/0x1b8 fs/open.c:1398 do_sys_open fs/open.c:1419 [inline] __do_sys_openat fs/open.c:1435 [inline] __se_sys_openat fs/open.c:1430 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1430 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 -> #1 (mapping.invalidate_lock#4){.+.+}-{3:3}: down_read+0x58/0x2fc kernel/locking/rwsem.c:1526 filemap_invalidate_lock_shared include/linux/fs.h:859 [inline] filemap_fault+0x504/0xff4 mm/filemap.c:3237 __do_fault+0x11c/0x374 mm/memory.c:4396 do_read_fault mm/memory.c:4758 [inline] do_fault mm/memory.c:4888 [inline] do_pte_missing mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:5164 [inline] __handle_mm_fault mm/memory.c:5305 [inline] handle_mm_fault+0x3a80/0x546c mm/memory.c:5470 __do_page_fault arch/arm64/mm/fault.c:505 [inline] do_page_fault+0x4f8/0xa64 arch/arm64/mm/fault.c:620 do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:704 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:840 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:432 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:492 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:593 do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] strncpy_from_user+0x224/0x54c lib/strncpy_from_user.c:139 getname_flags+0x104/0x48c fs/namei.c:151 getname fs/namei.c:219 [inline] __do_sys_mknodat fs/namei.c:4082 [inline] __se_sys_mknodat fs/namei.c:4079 [inline] __arm64_sys_mknodat+0x9c/0xcc fs/namei.c:4079 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 __might_fault+0xc4/0x124 mm/memory.c:6080 filldir64+0x2d4/0x948 fs/readdir.c:375 dir_emit_dot include/linux/fs.h:3483 [inline] hfsplus_readdir+0x398/0xf28 fs/hfsplus/dir.c:159 iterate_dir+0x3f8/0x580 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:409 [inline] __se_sys_getdents64 fs/readdir.c:394 [inline] __arm64_sys_getdents64+0x1c4/0x4a0 fs/readdir.c:394 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 other info that might help us debug this: Chain exists of: &mm->mmap_lock --> &hip->extents_lock --> &tree->tree_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&tree->tree_lock); lock(&hip->extents_lock); lock(&tree->tree_lock); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz-executor.0/9705: #0: ffff0000c85edc48 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x218/0x2a4 fs/file.c:1191 #1: ffff0000d6394d40 (&type->i_mutex_dir_key#20){++++}-{3:3}, at: iterate_dir+0x340/0x580 fs/readdir.c:103 #2: ffff0000d08aa0b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x144/0x1bc stack backtrace: CPU: 1 PID: 9705 Comm: syz-executor.0 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 __might_fault+0xc4/0x124 mm/memory.c:6080 filldir64+0x2d4/0x948 fs/readdir.c:375 dir_emit_dot include/linux/fs.h:3483 [inline] hfsplus_readdir+0x398/0xf28 fs/hfsplus/dir.c:159 iterate_dir+0x3f8/0x580 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:409 [inline] __se_sys_getdents64 fs/readdir.c:394 [inline] __arm64_sys_getdents64+0x1c4/0x4a0 fs/readdir.c:394 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 hfsplus: bad catalog entry type