syzbot

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BUG: KCSAN: data-race in filemap_fault / simple_write_end

write to 0xffff8881265019f0 of 8 bytes by task 7081 on cpu 0:
 i_size_write include/linux/fs.h:871 [inline]
 simple_write_end+0x11e/0x2f0 fs/libfs.c:618
 generic_perform_write+0x264/0x3f0 mm/filemap.c:3790
 __generic_file_write_iter+0xe3/0x280 mm/filemap.c:3907
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3939
 call_write_iter include/linux/fs.h:2058 [inline]
 new_sync_write fs/read_write.c:504 [inline]
 vfs_write+0x71c/0x890 fs/read_write.c:591
 ksys_write+0xe8/0x1a0 fs/read_write.c:644
 __do_sys_write fs/read_write.c:656 [inline]
 __se_sys_write fs/read_write.c:653 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:653
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff8881265019f0 of 8 bytes by task 7091 on cpu 1:
 i_size_read include/linux/fs.h:849 [inline]
 filemap_fault+0x505/0x740 mm/filemap.c:3215
 __do_fault mm/memory.c:4165 [inline]
 do_shared_fault mm/memory.c:4566 [inline]
 do_fault+0x5df/0xb20 mm/memory.c:4644
 handle_pte_fault mm/memory.c:4903 [inline]
 __handle_mm_fault mm/memory.c:5042 [inline]
 handle_mm_fault+0x889/0xa90 mm/memory.c:5140
 do_user_addr_fault+0x4cd/0x940 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x27/0x30
 copy_user_enhanced_fast_string+0xa/0x40
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline]
 copyout lib/iov_iter.c:155 [inline]
 copy_page_to_iter_iovec lib/iov_iter.c:226 [inline]
 __copy_page_to_iter lib/iov_iter.c:852 [inline]
 copy_page_to_iter+0x423/0x7b0 lib/iov_iter.c:880
 copy_folio_to_iter include/linux/uio.h:153 [inline]
 filemap_read+0x117b/0x1410 mm/filemap.c:2739
 generic_file_read_iter+0x72/0x320 mm/filemap.c:2834
 do_iter_readv_writev+0x27b/0x300
 do_iter_read+0x16f/0x5d0 fs/read_write.c:803
 vfs_readv fs/read_write.c:923 [inline]
 do_preadv+0x159/0x230 fs/read_write.c:1015
 __do_sys_preadv fs/read_write.c:1065 [inline]
 __se_sys_preadv fs/read_write.c:1060 [inline]
 __x64_sys_preadv+0x54/0x60 fs/read_write.c:1060
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x0000000000f67000 -> 0x0000000000f6d000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7091 Comm: syz-executor.5 Not tainted 5.19.0-rc4-syzkaller-00014-g941e3e791269-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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