exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0x205ad3fc, utbl_chksum : 0xe619d30d) ====================================================== WARNING: possible circular locking dependency detected 6.5.0-rc3-syzkaller-g6eaae1980760 #0 Not tainted ------------------------------------------------------ syz-executor.0/1476 is trying to acquire lock: ffff0000db654190 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0x9c/0x124 mm/memory.c:5851 but task is already holding lock: ffff00013512e0e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_iterate+0x14c/0x29d0 fs/exfat/dir.c:232 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sbi->s_lock#2){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 exfat_get_block+0x164/0x17ec fs/exfat/inode.c:280 do_mpage_readpage+0x818/0x1974 fs/mpage.c:234 mpage_readahead+0x360/0x644 fs/mpage.c:382 exfat_readahead+0x28/0x38 fs/exfat/inode.c:343 read_pages+0x168/0x6a0 mm/readahead.c:160 page_cache_ra_unbounded+0x46c/0x58c mm/readahead.c:269 do_page_cache_ra mm/readahead.c:299 [inline] page_cache_ra_order+0x7fc/0x994 mm/readahead.c:559 do_sync_mmap_readahead+0x3a4/0x844 filemap_fault+0x5bc/0x1154 mm/filemap.c:3297 __do_fault+0x11c/0x3d8 mm/memory.c:4198 do_read_fault mm/memory.c:4547 [inline] do_fault mm/memory.c:4670 [inline] do_pte_missing mm/memory.c:3664 [inline] handle_pte_fault mm/memory.c:4939 [inline] __handle_mm_fault mm/memory.c:5079 [inline] handle_mm_fault+0x30ac/0x4708 mm/memory.c:5233 __do_page_fault arch/arm64/mm/fault.c:513 [inline] do_page_fault+0x4c8/0xa88 arch/arm64/mm/fault.c:627 do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:711 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:847 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:369 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:429 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:586 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:151 getname+0x28/0x38 fs/namei.c:219 do_sys_openat2+0xd0/0x1b8 fs/open.c:1401 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1433 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:139 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:188 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 -> #1 (mapping.invalidate_lock#3){.+.+}-{3:3}: down_read+0x58/0x2fc kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:826 [inline] filemap_fault+0x54c/0x1154 mm/filemap.c:3289 __do_fault+0x11c/0x3d8 mm/memory.c:4198 do_read_fault mm/memory.c:4547 [inline] do_fault mm/memory.c:4670 [inline] do_pte_missing mm/memory.c:3664 [inline] handle_pte_fault mm/memory.c:4939 [inline] __handle_mm_fault mm/memory.c:5079 [inline] handle_mm_fault+0x30ac/0x4708 mm/memory.c:5233 __do_page_fault arch/arm64/mm/fault.c:513 [inline] do_page_fault+0x4c8/0xa88 arch/arm64/mm/fault.c:627 do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:711 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:847 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:369 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:429 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:586 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:151 getname+0x28/0x38 fs/namei.c:219 do_sys_openat2+0xd0/0x1b8 fs/open.c:1401 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1433 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:139 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:188 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x3370/0x75e8 kernel/locking/lockdep.c:5144 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5761 __might_fault+0xc4/0x124 mm/memory.c:5852 filldir64+0x2d4/0x948 fs/readdir.c:335 dir_emit_dot include/linux/fs.h:3180 [inline] dir_emit_dots include/linux/fs.h:3191 [inline] exfat_iterate+0x23c/0x29d0 fs/exfat/dir.c:235 iterate_dir+0x1f4/0x50c __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+0x138/0x244 arch/arm64/kernel/syscall.c:139 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:188 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 other info that might help us debug this: Chain exists of: &mm->mmap_lock --> mapping.invalidate_lock#3 --> &sbi->s_lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->s_lock#2); lock(mapping.invalidate_lock#3); lock(&sbi->s_lock#2); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz-executor.0/1476: #0: ffff0000dc874ac8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x220/0x2a8 fs/file.c:1047 #1: ffff000127cba330 (&sb->s_type->i_mutex_key#19){++++}-{3:3}, at: iterate_dir+0x124/0x50c fs/readdir.c:57 #2: ffff00013512e0e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_iterate+0x14c/0x29d0 fs/exfat/dir.c:232 stack backtrace: CPU: 1 PID: 1476 Comm: syz-executor.0 Not tainted 6.5.0-rc3-syzkaller-g6eaae1980760 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __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:2068 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2195 check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x3370/0x75e8 kernel/locking/lockdep.c:5144 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5761 __might_fault+0xc4/0x124 mm/memory.c:5852 filldir64+0x2d4/0x948 fs/readdir.c:335 dir_emit_dot include/linux/fs.h:3180 [inline] dir_emit_dots include/linux/fs.h:3191 [inline] exfat_iterate+0x23c/0x29d0 fs/exfat/dir.c:235 iterate_dir+0x1f4/0x50c __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+0x138/0x244 arch/arm64/kernel/syscall.c:139 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:188 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591