FAT-fs (loop4): error, invalid access to FAT (entry 0x00000100)
FAT-fs (loop4): Filesystem has been set read-only
FAT-fs (loop4): error, invalid access to FAT (entry 0x00000100)
FAT-fs (loop4): error, invalid access to FAT (entry 0x00000100)
==================================================================
BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping

write to 0xffffea0004743d18 of 8 bytes by task 14442 on cpu 0:
 page_cache_delete mm/filemap.c:144 [inline]
 __filemap_remove_folio+0x1a5/0x2a0 mm/filemap.c:224
 folio_unmap_invalidate+0x1dd/0x360 mm/truncate.c:622
 invalidate_inode_pages2_range+0x27c/0x3d0 mm/truncate.c:697
 filemap_invalidate_pages+0x16d/0x1a0 mm/filemap.c:2827
 kiocb_invalidate_pages mm/filemap.c:2835 [inline]
 generic_file_direct_write+0x9d/0x240 mm/filemap.c:4102
 __generic_file_write_iter+0xab/0x120 mm/filemap.c:4278
 generic_file_write_iter+0x8d/0x2f0 mm/filemap.c:4318
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x52a/0x960 fs/read_write.c:686
 ksys_write+0xda/0x1a0 fs/read_write.c:738
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:746
 x64_sys_call+0x27fe/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea0004743d18 of 8 bytes by task 14440 on cpu 1:
 folio_mapping+0xa1/0x120 mm/util.c:702
 folio_evictable mm/internal.h:499 [inline]
 __mlock_folio mm/mlock.c:69 [inline]
 mlock_folio_batch+0x2d0/0x1a70 mm/mlock.c:200
 mlock_drain_local+0x4d/0xa0 mm/mlock.c:219
 lru_add_drain+0x55/0x70 mm/swap.c:737
 populate_vma_page_range mm/gup.c:1882 [inline]
 __mm_populate+0x24b/0x3a0 mm/gup.c:1983
 mm_populate include/linux/mm.h:3367 [inline]
 vm_mmap_pgoff+0x232/0x2e0 mm/util.c:585
 ksys_mmap_pgoff+0x268/0x310 mm/mmap.c:604
 x64_sys_call+0x14a3/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888119871408 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 14440 Comm: syz.4.3570 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
==================================================================