syzbot

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BUG: KCSAN: data-race in atime_needs_update / propagate_one

write to 0xffff888100cb75f0 of 4 bytes by task 8381 on cpu 0:
 propagate_one+0x35d/0x430 fs/pnode.c:267
 propagate_mnt+0x328/0x6b0 fs/pnode.c:319
 attach_recursive_mnt+0x4fb/0x11c0 fs/namespace.c:2153
 graft_tree fs/namespace.c:2261 [inline]
 do_add_mount fs/namespace.c:2812 [inline]
 do_new_mount_fc fs/namespace.c:2851 [inline]
 do_new_mount fs/namespace.c:2905 [inline]
 path_mount+0x1acf/0x1c00 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888100cb75f0 of 4 bytes by task 8358 on cpu 1:
 relatime_need_update fs/inode.c:1720 [inline]
 atime_needs_update+0x1e1/0x390 fs/inode.c:1817
 touch_atime+0x55/0x2d0 fs/inode.c:1832
 file_accessed include/linux/fs.h:2319 [inline]
 filemap_read+0x74f/0x7b0 mm/filemap.c:2530
 generic_file_read_iter+0x82/0x410 mm/filemap.c:2609
 ext4_file_read_iter+0x2e0/0x420 fs/ext4/file.c:74
 __kernel_read+0x306/0x580 fs/read_write.c:454
 integrity_kernel_read+0x4c/0x70 security/integrity/iint.c:199
 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+0x929/0x1310 security/integrity/ima/ima_crypto.c:572
 ima_collect_measurement+0x168/0x310 security/integrity/ima/ima_api.c:252
 process_measurement+0xa88/0x10f0 security/integrity/ima/ima_main.c:330
 ima_file_check+0x75/0xa0 security/integrity/ima/ima_main.c:499
 do_open fs/namei.c:3369 [inline]
 path_openat+0x19c5/0x21b0 fs/namei.c:3500
 do_filp_open+0xd9/0x1f0 fs/namei.c:3527
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1214
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8358 Comm: syz-fuzzer Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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