syzbot

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BUG: KCSAN: data-race in filemap_read / truncate_setsize

read-write to 0xffff88810a98a5e0 of 8 bytes by task 9041 on cpu 1:
 i_size_write include/linux/fs.h:888 [inline]
 truncate_setsize+0x21/0xb0 mm/truncate.c:765
 simple_setattr+0x8b/0xc0 fs/libfs.c:536
 notify_change+0x8c3/0x930 fs/attr.c:482
 do_truncate+0x116/0x150 fs/open.c:66
 handle_truncate fs/namei.c:3219 [inline]
 do_open fs/namei.c:3564 [inline]
 path_openat+0x1984/0x1d00 fs/namei.c:3715
 do_filp_open+0xf6/0x200 fs/namei.c:3742
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_creat fs/open.c:1440 [inline]
 __se_sys_creat fs/open.c:1434 [inline]
 __x64_sys_creat+0x66/0x90 fs/open.c:1434
 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 0xffff88810a98a5e0 of 8 bytes by task 9039 on cpu 0:
 i_size_read include/linux/fs.h:866 [inline]
 filemap_read+0x247/0x680 mm/filemap.c:2706
 generic_file_read_iter+0x76/0x320 mm/filemap.c:2840
 call_read_iter include/linux/fs.h:1845 [inline]
 generic_file_splice_read+0xe3/0x290 fs/splice.c:402
 do_splice_to fs/splice.c:885 [inline]
 splice_direct_to_actor+0x25a/0x5f0 fs/splice.c:956
 do_splice_direct+0x104/0x180 fs/splice.c:1065
 do_sendfile+0x3b8/0x950 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1317 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0xbd/0x150 fs/read_write.c:1309
 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: 0x00000000000c248c -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9039 Comm: syz-executor.1 Not tainted 6.3.0-rc4-syzkaller-00199-g7b50567bdcad #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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