syzbot

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BUG: KCSAN: data-race in atime_needs_update / ext4_unlink

write to 0xffff8880b3edf1e8 of 8 bytes by task 9154 on cpu 1:
 ext4_unlink+0x7a6/0x9f0 fs/ext4/namei.c:3240
 vfs_unlink+0x22f/0x3d0 fs/namei.c:3825
 do_unlinkat+0x28a/0x4d0 fs/namei.c:3889
 __do_sys_unlink fs/namei.c:3936 [inline]
 __se_sys_unlink fs/namei.c:3934 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3934
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b3edf1e8 of 8 bytes by task 17345 on cpu 0:
 timespec64_compare include/linux/time64.h:58 [inline]
 relatime_need_update fs/inode.c:1728 [inline]
 atime_needs_update+0x322/0x370 fs/inode.c:1813
 touch_atime+0x53/0x1a0 fs/inode.c:1828
 file_accessed include/linux/fs.h:2229 [inline]
 generic_file_buffered_read+0x1918/0x19e0 mm/filemap.c:2249
 generic_file_read_iter+0x7d/0x3e0 mm/filemap.c:2326
 ext4_file_read_iter+0x2d6/0x420 fs/ext4/file.c:74
 call_read_iter include/linux/fs.h:1902 [inline]
 new_sync_read fs/read_write.c:415 [inline]
 __kernel_read+0x511/0x580 fs/read_write.c:438
 integrity_kernel_read+0x4c/0x70 security/integrity/iint.c:191
 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:484 [inline]
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:515 [inline]
 ima_calc_file_hash+0x9bf/0x13e0 security/integrity/ima/ima_crypto.c:580
 ima_collect_measurement+0x168/0x310 security/integrity/ima/ima_api.c:250
 process_measurement+0xa65/0x10d0 security/integrity/ima/ima_main.c:324
 ima_file_check+0x75/0xa0 security/integrity/ima/ima_main.c:492
 do_open fs/namei.c:3245 [inline]
 path_openat+0x18a2/0x20e0 fs/namei.c:3360
 do_filp_open+0xbd/0x1d0 fs/namei.c:3387
 do_sys_openat2+0x33c/0x4a0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 ksys_open include/linux/syscalls.h:1388 [inline]
 __do_sys_open fs/open.c:1201 [inline]
 __se_sys_open fs/open.c:1199 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1199
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17345 Comm: syz-executor.5 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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