loop2: detected capacity change from 0 to 8192
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BUG: KCSAN: data-race in mark_buffer_dirty_inode / sync_mapping_buffers

write to 0xffff888133c1abb8 of 8 bytes by task 15942 on cpu 0:
 __remove_assoc_queue fs/buffer.c:516 [inline]
 fsync_buffers_list fs/buffer.c:791 [inline]
 sync_mapping_buffers+0x162/0x7e0 fs/buffer.c:577
 fat_file_fsync+0xad/0x100 fs/fat/file.c:195
 vfs_fsync_range+0x122/0x140 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2794 [inline]
 generic_file_write_iter+0x191/0x1d0 mm/filemap.c:4140
 aio_write+0x304/0x430 fs/aio.c:1642
 io_submit_one+0xb18/0x1240 fs/aio.c:2061
 __do_sys_io_submit fs/aio.c:2120 [inline]
 __se_sys_io_submit+0xf5/0x280 fs/aio.c:2090
 __x64_sys_io_submit+0x43/0x50 fs/aio.c:2090
 x64_sys_call+0x2ab5/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:210
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888133c1abb8 of 8 bytes by task 15941 on cpu 1:
 mark_buffer_dirty_inode+0x96/0x1c0 fs/buffer.c:680
 fat16_ent_put+0x4f/0x60 fs/fat/fatent.c:184
 fat_ent_write+0x66/0xe0 fs/fat/fatent.c:417
 fat_chain_add+0x15f/0x400 fs/fat/misc.c:136
 fat_add_cluster fs/fat/inode.c:113 [inline]
 __fat_get_block fs/fat/inode.c:155 [inline]
 fat_get_block+0x46b/0x5e0 fs/fat/inode.c:190
 __block_write_begin_int+0x417/0xfa0 fs/buffer.c:2128
 __block_write_begin fs/buffer.c:2177 [inline]
 block_write_begin+0x7b/0x170 fs/buffer.c:2236
 cont_write_begin+0x486/0x6b0 fs/buffer.c:2590
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:230
 generic_perform_write+0x1d5/0x410 mm/filemap.c:4015
 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4110
 generic_file_write_iter+0x7d/0x1d0 mm/filemap.c:4136
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x78f/0x900 fs/read_write.c:590
 ksys_write+0xeb/0x1b0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:652
 x64_sys_call+0x27ef/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888133c01440 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15941 Comm: syz-executor.2 Tainted: G        W          6.10.0-rc4-syzkaller-00148-g50736169ecc8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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