exFAT-fs (loop4): failed to load upcase table (idx : 0x000104f2, chksum : 0x0548ef44, utbl_chksum : 0xe619d30d)
process 'syz-executor.4' launched './file1' with NULL argv: empty string added
======================================================
WARNING: possible circular locking dependency detected
6.4.0-rc7-syzkaller-ge40939bbfc68 #0 Not tainted
------------------------------------------------------
syz-executor.4/12282 is trying to acquire lock:
ffff000112b280e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_get_block+0x164/0x17ec fs/exfat/inode.c:280

but task is already holding lock:
ffff00010d1558d0 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:830 [inline]
ffff00010d1558d0 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: page_cache_ra_unbounded+0xc8/0x58c mm/readahead.c:226

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (mapping.invalidate_lock#3){.+.+}-{3:3}:
       down_read+0x58/0x2fc kernel/locking/rwsem.c:1520
       filemap_invalidate_lock_shared include/linux/fs.h:830 [inline]
       filemap_fault+0x54c/0x1154 mm/filemap.c:3277
       __do_fault+0x11c/0x3d8 mm/memory.c:4176
       do_read_fault mm/memory.c:4530 [inline]
       do_fault mm/memory.c:4659 [inline]
       do_pte_missing mm/memory.c:3647 [inline]
       handle_pte_fault mm/memory.c:4947 [inline]
       __handle_mm_fault mm/memory.c:5089 [inline]
       handle_mm_fault+0x32cc/0x48ec mm/memory.c:5243
       faultin_page mm/gup.c:925 [inline]
       __get_user_pages+0x4c4/0xa94 mm/gup.c:1147
       populate_vma_page_range+0x26c/0x35c mm/gup.c:1543
       __mm_populate+0x240/0x3d8 mm/gup.c:1652
       mm_populate include/linux/mm.h:3153 [inline]
       vm_mmap_pgoff+0x2a4/0x3b8 mm/util.c:548
       ksys_mmap_pgoff+0x3c8/0x5b0 mm/mmap.c:1440
       __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline]
       __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline]
       __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21
       __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:142
       do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191
       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 (&mm->mmap_lock){++++}-{3:3}:
       __might_fault+0xc4/0x124 mm/memory.c:5732
       filldir64+0x2d4/0x948 fs/readdir.c:335
       dir_emit_dot include/linux/fs.h:3163 [inline]
       dir_emit_dots include/linux/fs.h:3174 [inline]
       exfat_iterate+0x23c/0x29d0 fs/exfat/dir.c:235
       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+0x138/0x244 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191
       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 (&sbi->s_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3113 [inline]
       check_prevs_add kernel/locking/lockdep.c:3232 [inline]
       validate_chain kernel/locking/lockdep.c:3847 [inline]
       __lock_acquire+0x3308/0x7604 kernel/locking/lockdep.c:5088
       lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5705
       __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: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:1211 [inline]
       filemap_get_pages+0x368/0x1640 mm/filemap.c:2601
       filemap_read+0x354/0xc98 mm/filemap.c:2696
       generic_file_read_iter+0xa0/0x450 mm/filemap.c:2843
       __kernel_read+0x30c/0x6b4 fs/read_write.c:428
       kernel_read+0xd8/0x1d4 fs/read_write.c:446
       prepare_binprm fs/exec.c:1667 [inline]
       search_binary_handler fs/exec.c:1721 [inline]
       exec_binprm fs/exec.c:1779 [inline]
       bprm_execve+0x76c/0x1550 fs/exec.c:1854
       do_execveat_common+0x668/0x814 fs/exec.c:1962
       do_execve fs/exec.c:2036 [inline]
       __do_sys_execve fs/exec.c:2112 [inline]
       __se_sys_execve fs/exec.c:2107 [inline]
       __arm64_sys_execve+0x98/0xb0 fs/exec.c:2107
       __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:142
       do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191
       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:
  &sbi->s_lock --> &mm->mmap_lock --> mapping.invalidate_lock#3

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(mapping.invalidate_lock#3);
                               lock(&mm->mmap_lock);
                               lock(mapping.invalidate_lock#3);
  lock(&sbi->s_lock);

 *** DEADLOCK ***

2 locks held by syz-executor.4/12282:
 #0: ffff0000d48df150 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1475 [inline]
 #0: ffff0000d48df150 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xb4/0x1550 fs/exec.c:1816
 #1: ffff00010d1558d0 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:830 [inline]
 #1: ffff00010d1558d0 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: page_cache_ra_unbounded+0xc8/0x58c mm/readahead.c:226

stack backtrace:
CPU: 1 PID: 12282 Comm: syz-executor.4 Not tainted 6.4.0-rc7-syzkaller-ge40939bbfc68 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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:2066
 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2188
 check_prev_add kernel/locking/lockdep.c:3113 [inline]
 check_prevs_add kernel/locking/lockdep.c:3232 [inline]
 validate_chain kernel/locking/lockdep.c:3847 [inline]
 __lock_acquire+0x3308/0x7604 kernel/locking/lockdep.c:5088
 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5705
 __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: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:1211 [inline]
 filemap_get_pages+0x368/0x1640 mm/filemap.c:2601
 filemap_read+0x354/0xc98 mm/filemap.c:2696
 generic_file_read_iter+0xa0/0x450 mm/filemap.c:2843
 __kernel_read+0x30c/0x6b4 fs/read_write.c:428
 kernel_read+0xd8/0x1d4 fs/read_write.c:446
 prepare_binprm fs/exec.c:1667 [inline]
 search_binary_handler fs/exec.c:1721 [inline]
 exec_binprm fs/exec.c:1779 [inline]
 bprm_execve+0x76c/0x1550 fs/exec.c:1854
 do_execveat_common+0x668/0x814 fs/exec.c:1962
 do_execve fs/exec.c:2036 [inline]
 __do_sys_execve fs/exec.c:2112 [inline]
 __se_sys_execve fs/exec.c:2107 [inline]
 __arm64_sys_execve+0x98/0xb0 fs/exec.c:2107
 __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:142
 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191
 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
exFAT-fs (loop4): error, broken FAT chain.
exFAT-fs (loop4): Filesystem has been set read-only
exFAT-fs (loop4): error, failed to bmap (inode : 00000000eb70472c iblock : 0, err : -5)
exFAT-fs (loop4): error, broken FAT chain.
exFAT-fs (loop4): error, failed to bmap (inode : 00000000eb70472c iblock : 0, err : -5)
exFAT-fs (loop4): error, broken FAT chain.
exFAT-fs (loop4): error, failed to bmap (inode : 00000000eb70472c iblock : 0, err : -5)