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BUG: KCSAN: data-race in ext4_mpage_readpages / ext4_setattr

write to 0xffff888128f7ea78 of 8 bytes by task 28813 on cpu 0:
 i_size_write include/linux/fs.h:888 [inline]
 ext4_setattr+0xcf3/0x1670 fs/ext4/inode.c:5310
 notify_change+0x7e1/0xaa0 fs/attr.c:337
 do_truncate+0xfb/0x180 fs/open.c:64
 handle_truncate fs/namei.c:3015 [inline]
 do_last fs/namei.c:3426 [inline]
 path_openat+0x13e8/0x3580 fs/namei.c:3537
 do_filp_open+0x11e/0x1b0 fs/namei.c:3567
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 ksys_open include/linux/syscalls.h:1385 [inline]
 __do_sys_creat fs/open.c:1155 [inline]
 __se_sys_creat fs/open.c:1153 [inline]
 __x64_sys_creat+0x45/0x60 fs/open.c:1153
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888128f7ea78 of 8 bytes by task 28833 on cpu 1:
 ext4_readpage_limit fs/ext4/readpage.c:209 [inline]
 ext4_mpage_readpages+0x563/0x1580 fs/ext4/readpage.c:257
 ext4_readpage fs/ext4/inode.c:3228 [inline]
 ext4_readpage+0xcc/0x200 fs/ext4/inode.c:3217
 generic_file_buffered_read mm/filemap.c:2188 [inline]
 generic_file_read_iter+0xbfa/0x1440 mm/filemap.c:2324
 ext4_file_read_iter fs/ext4/file.c:130 [inline]
 ext4_file_read_iter+0x10c/0x380 fs/ext4/file.c:113
 call_read_iter include/linux/fs.h:1896 [inline]
 new_sync_read+0x389/0x4f0 fs/read_write.c:414
 __vfs_read+0xb1/0xc0 fs/read_write.c:427
 integrity_kernel_read+0xa1/0xe0 security/integrity/iint.c:200
 ima_calc_file_hash_tfm+0x1b5/0x260 security/integrity/ima/ima_crypto.c:360
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:389 [inline]
 ima_calc_file_hash+0x158/0xf30 security/integrity/ima/ima_crypto.c:454
 ima_collect_measurement+0x3b1/0x3e0 security/integrity/ima/ima_api.c:247
 process_measurement+0x9e3/0x1190 security/integrity/ima/ima_main.c:326
 ima_file_check+0x7e/0xb0 security/integrity/ima/ima_main.c:442
 do_last fs/namei.c:3424 [inline]
 path_openat+0xfdb/0x3580 fs/namei.c:3537
 do_filp_open+0x11e/0x1b0 fs/namei.c:3567
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1110
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 28833 Comm: syz-executor.0 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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