exFAT-fs (loop2): failed to load upcase table (idx : 0x00010000, chksum : 0x0a6527f3, utbl_chksum : 0xe619d30d) ====================================================== WARNING: possible circular locking dependency detected 6.1.38-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/7309 is trying to acquire lock: ffff0000d949f348 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0x9c/0x124 mm/memory.c:5793 but task is already holding lock: ffff00012300e0e0 (&sbi->s_lock#4){+.+.}-{3:3}, at: exfat_iterate+0x144/0x2734 fs/exfat/dir.c:228 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sbi->s_lock#4){+.+.}-{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 exfat_get_block+0x164/0x17ec fs/exfat/inode.c:281 do_mpage_readpage+0x5d8/0x1748 fs/mpage.c:208 mpage_readahead+0x360/0x644 fs/mpage.c:361 exfat_readahead+0x28/0x38 fs/exfat/inode.c:344 read_pages+0x168/0x6a0 mm/readahead.c:161 page_cache_ra_unbounded+0x46c/0x58c mm/readahead.c:270 do_page_cache_ra mm/readahead.c:300 [inline] page_cache_ra_order+0x7fc/0x994 mm/readahead.c:560 ondemand_readahead+0x5f8/0xb04 mm/readahead.c:682 page_cache_sync_ra+0x350/0x3d0 mm/readahead.c:709 page_cache_sync_readahead include/linux/pagemap.h:1213 [inline] filemap_get_pages mm/filemap.c:2582 [inline] filemap_read+0x598/0x2260 mm/filemap.c:2676 generic_file_read_iter+0xa0/0x450 mm/filemap.c:2822 __kernel_read+0x30c/0x6b4 fs/read_write.c:428 kernel_read+0xd8/0x1d4 fs/read_write.c:446 prepare_binprm fs/exec.c:1663 [inline] search_binary_handler fs/exec.c:1717 [inline] exec_binprm fs/exec.c:1774 [inline] bprm_execve+0x764/0x162c fs/exec.c:1843 do_execveat_common+0x668/0x814 fs/exec.c:1948 do_execveat fs/exec.c:2033 [inline] __do_sys_execveat fs/exec.c:2107 [inline] __se_sys_execveat fs/exec.c:2101 [inline] __arm64_sys_execveat+0xd0/0xec fs/exec.c:2101 __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:581 -> #1 (mapping.invalidate_lock#10){.+.+}-{3:3}: down_read+0x64/0x308 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] filemap_fault+0x58c/0xf7c mm/filemap.c:3128 __do_fault+0x11c/0x3d8 mm/memory.c:4224 do_read_fault mm/memory.c:4575 [inline] do_fault mm/memory.c:4704 [inline] handle_pte_fault mm/memory.c:4976 [inline] __handle_mm_fault mm/memory.c:5118 [inline] handle_mm_fault+0x1f68/0x3e9c mm/memory.c:5239 __do_page_fault arch/arm64/mm/fault.c:499 [inline] do_page_fault+0x330/0x890 arch/arm64/mm/fault.c:583 do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:667 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:803 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576 do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] strncpy_from_user+0x224/0x54c lib/strncpy_from_user.c:139 getname_flags+0x104/0x480 fs/namei.c:150 getname+0x28/0x38 fs/namei.c:218 do_sys_openat2+0xd4/0x3d8 fs/open.c:1312 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345 __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:581 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __might_fault+0xc4/0x124 mm/memory.c:5794 filldir64+0x2d4/0x948 fs/readdir.c:335 dir_emit_dot include/linux/fs.h:3583 [inline] dir_emit_dots include/linux/fs.h:3594 [inline] exfat_iterate+0x23c/0x2734 fs/exfat/dir.c:231 iterate_dir+0x1f4/0x4e4 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x1c4/0x4a0 fs/readdir.c:354 __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:581 other info that might help us debug this: Chain exists of: &mm->mmap_lock --> mapping.invalidate_lock#10 --> &sbi->s_lock#4 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->s_lock#4); lock(mapping.invalidate_lock#10); lock(&sbi->s_lock#4); lock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz-executor.2/7309: #0: ffff000124641268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xd8/0x104 fs/file.c:1047 #1: ffff000124e93030 (&sb->s_type->i_mutex_key#31){++++}-{3:3}, at: iterate_dir+0x124/0x4e4 fs/readdir.c:57 #2: ffff00012300e0e0 (&sbi->s_lock#4){+.+.}-{3:3}, at: exfat_iterate+0x144/0x2734 fs/exfat/dir.c:228 stack backtrace: CPU: 1 PID: 7309 Comm: syz-executor.2 Not tainted 6.1.38-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 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:2056 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __might_fault+0xc4/0x124 mm/memory.c:5794 filldir64+0x2d4/0x948 fs/readdir.c:335 dir_emit_dot include/linux/fs.h:3583 [inline] dir_emit_dots include/linux/fs.h:3594 [inline] exfat_iterate+0x23c/0x2734 fs/exfat/dir.c:231 iterate_dir+0x1f4/0x4e4 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x1c4/0x4a0 fs/readdir.c:354 __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:581