================================================================== BUG: KCSAN: data-race in __mpage_writepage / generic_write_end write to 0xffff88810650ae60 of 8 bytes by task 4865 on cpu 0: i_size_write include/linux/fs.h:932 [inline] generic_write_end+0x94/0x230 fs/buffer.c:2292 fat_write_end+0x4e/0x160 fs/fat/inode.c:244 generic_perform_write+0x267/0x410 mm/filemap.c:3980 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4064 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4090 do_iter_write+0x4b4/0x7b0 fs/read_write.c:860 vfs_iter_write+0x56/0x70 fs/read_write.c:901 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736 do_splice_from fs/splice.c:933 [inline] direct_splice_actor+0x8a/0xb0 fs/splice.c:1142 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088 do_splice_direct+0x10d/0x190 fs/splice.c:1194 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff88810650ae60 of 8 bytes by task 4868 on cpu 1: i_size_read include/linux/fs.h:910 [inline] __mpage_writepage+0xc0/0xd90 fs/mpage.c:489 write_cache_pages+0x38d/0x740 mm/page-writeback.c:2474 mpage_writepages+0x72/0xe0 fs/mpage.c:679 fat_writepages+0x24/0x30 fs/fat/inode.c:200 do_writepages+0x1c2/0x340 mm/page-writeback.c:2553 filemap_fdatawrite_wbc+0xdb/0xf0 mm/filemap.c:390 __filemap_fdatawrite_range mm/filemap.c:423 [inline] filemap_write_and_wait_range+0xe0/0x210 mm/filemap.c:678 kiocb_write_and_wait mm/filemap.c:2738 [inline] generic_file_read_iter+0x101/0x330 mm/filemap.c:2803 call_read_iter include/linux/fs.h:1950 [inline] copy_splice_read+0x26b/0x4b0 fs/splice.c:364 vfs_splice_read fs/splice.c:992 [inline] splice_direct_to_actor+0x2aa/0x690 fs/splice.c:1069 do_splice_direct+0x10d/0x190 fs/splice.c:1194 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x00000000002cebdb -> 0x00000000002cf000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 4868 Comm: syz-executor.1 Not tainted 6.6.0-rc6-syzkaller-00043-gdd72f9c7e512 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 ==================================================================