KCSAN: data-race in __ext4_update_other_inode_time / clear

KCSAN: data-race in __ext4_update_other_inode_time / clear_inode
Status: auto-closed as invalid on 2020/10/02 18:58
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 399d, last: 328d

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __ext4_update_other_inode_time / clear_inode

write to 0xffff88807a045a10 of 8 bytes by task 8758 on cpu 1:
 clear_inode+0x105/0x140 fs/inode.c:538
 ext4_clear_inode+0x1f/0x100 fs/ext4/super.c:1223
 ext4_free_inode+0x1b6/0x9d0 fs/ext4/ialloc.c:276
 ext4_evict_inode+0xafa/0xc20 fs/ext4/inode.c:324
 evict+0x19f/0x470 fs/inode.c:576
 iput_final fs/inode.c:1652 [inline]
 iput+0x44a/0x550 fs/inode.c:1678
 do_unlinkat+0x2c9/0x4d0 fs/namei.c:3902
 __do_sys_unlink fs/namei.c:3942 [inline]
 __se_sys_unlink fs/namei.c:3940 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3940
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88807a045a10 of 8 bytes by task 14198 on cpu 0:
 __ext4_update_other_inode_time+0x45/0x570 fs/ext4/inode.c:4893
 ext4_update_other_inodes_time fs/ext4/inode.c:4940 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5068 [inline]
 ext4_mark_iloc_dirty+0x1296/0x1660 fs/ext4/inode.c:5624
 __ext4_mark_inode_dirty+0x448/0x630 fs/ext4/inode.c:5818
 ext4_dirty_inode+0xa6/0xc0 fs/ext4/inode.c:5854
 __mark_inode_dirty+0x72/0x7e0 fs/fs-writeback.c:2258
 mark_inode_dirty include/linux/fs.h:2166 [inline]
 generic_write_end+0x166/0x250 fs/buffer.c:2202
 ext4_da_write_end+0x57e/0x760 fs/ext4/inode.c:3091
 generic_perform_write+0x23b/0x390 mm/filemap.c:3414
 ext4_buffered_write_iter+0x2cc/0x3b0 fs/ext4/file.c:269
 ext4_file_write_iter+0x768/0x1060 include/linux/fs.h:784
 call_write_iter include/linux/fs.h:1882 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x665/0x6f0 fs/read_write.c:578
 ksys_write+0xce/0x180 fs/read_write.c:631
 __do_sys_write fs/read_write.c:643 [inline]
 __se_sys_write fs/read_write.c:640 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:640
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14198 Comm: syz-executor.0 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (25):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report
ci2-upstream-kcsan-gce	2020/08/28 18:58	upstream	15bc20c6af4c	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/15 06:01	upstream	c9c9735c46f5	5ce13532	.config	log	report
ci2-upstream-kcsan-gce	2020/08/09 21:24	upstream	9420f1ce0186	70301872	.config	log	report
ci2-upstream-kcsan-gce	2020/08/09 15:41	upstream	06a81c1c7db9	70301872	.config	log	report
ci2-upstream-kcsan-gce	2020/08/07 13:48	upstream	86cfccb66937	28ac5c9e	.config	log	report
ci2-upstream-kcsan-gce	2020/08/01 03:15	upstream	7dc6fd0f3b84	8df85ed9	.config	log	report
ci2-upstream-kcsan-gce	2020/07/30 10:43	upstream	83bdc7275e62	b0947553	.config	log	report
ci2-upstream-kcsan-gce	2020/07/28 21:24	upstream	6ba1b005ffc3	cb93dc6a	.config	log	report
ci2-upstream-kcsan-gce	2020/07/25 14:30	upstream	23ee3e4e5bd2	1f7cc1ca	.config	log	report
ci2-upstream-kcsan-gce	2020/07/22 02:24	upstream	4fa640dc5230	21f1765e	.config	log	report
ci2-upstream-kcsan-gce	2020/07/18 19:45	upstream	6cf7ccba29dc	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/17 15:57	upstream	8882572675c1	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/17 02:00	upstream	07a56bb875af	54b3c45e	.config	log	report
ci2-upstream-kcsan-gce	2020/07/13 08:35	upstream	11ba468877bb	f90ec899	.config	log	report
ci2-upstream-kcsan-gce	2020/07/07 15:23	upstream	bfe91da29bfa	42723355	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 20:25	upstream	45a5ac7a5cc3	22f87567	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 20:23	upstream	45a5ac7a5cc3	22f87567	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 02:25	upstream	35e884f89df4	24d7f505	.config	log	report
ci2-upstream-kcsan-gce	2020/07/03 13:32	upstream	cdd3bb54332f	6e569755	.config	log	report
ci2-upstream-kcsan-gce	2020/07/02 04:33	upstream	cd77006e01b3	bed10395	.config	log	report
ci2-upstream-kcsan-gce	2020/06/29 05:24	upstream	9ebcfadb0610	a2cdad9d	.config	log	report
ci2-upstream-kcsan-gce	2020/06/27 15:57	upstream	1590a2e1c681	2defc703	.config	log	report
ci2-upstream-kcsan-gce	2020/06/21 19:24	upstream	64677779e896	4f2acff9	.config	log	report
ci2-upstream-kcsan-gce	2020/06/19 20:42	upstream	672f9255a727	123cf502	.config	log	report
ci2-upstream-kcsan-gce	2020/06/19 04:27	upstream	5e857ce6eae7	bc258b50	.config	log	report