KCSAN: data-race in ext4_setattr / mpage_process_page

KCSAN: data-race in ext4_setattr / mpage_process_page_bufs (2)
Status: moderation: reported on 2020/09/21 10:22
Reported-by: syzbot+d8c674e306c5fd82145e@syzkaller.appspotmail.com
First crash: 318d, last: 16h51m

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs				35	331d	554d	0/22	closed as invalid on 2020/06/18 14:24

Sample crash report:

==================================================================
BUG: KCSAN: data-race in ext4_setattr / mpage_process_page_bufs

write to 0xffff888160d8fc30 of 8 bytes by task 32099 on cpu 0:
 i_size_write include/linux/fs.h:871 [inline]
 ext4_setattr+0xd54/0xec0 fs/ext4/inode.c:5481
 notify_change+0x8a3/0xa80 fs/attr.c:398
 do_truncate+0xe8/0x130 fs/open.c:64
 handle_truncate fs/namei.c:3017 [inline]
 do_open fs/namei.c:3365 [inline]
 path_openat+0x1a79/0x20b0 fs/namei.c:3494
 do_filp_open+0xd9/0x1f0 fs/namei.c:3521
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_creat fs/open.c:1277 [inline]
 __se_sys_creat fs/open.c:1271 [inline]
 __x64_sys_creat+0x62/0x80 fs/open.c:1271
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888160d8fc30 of 8 bytes by task 32094 on cpu 1:
 i_size_read include/linux/fs.h:849 [inline]
 mpage_process_page_bufs+0x34/0x560 fs/ext4/inode.c:2192
 mpage_prepare_extent_to_map+0x4e6/0x640 fs/ext4/inode.c:2626
 ext4_writepages+0x9d8/0x1d10 fs/ext4/inode.c:2798
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range mm/filemap.c:413 [inline]
 __filemap_fdatawrite mm/filemap.c:421 [inline]
 filemap_flush+0x132/0x160 mm/filemap.c:448
 ext4_alloc_da_blocks+0x4a/0xd0 fs/ext4/inode.c:3164
 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:141
 __fput+0x25b/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 get_signal+0x158d/0x1610 kernel/signal.c:2591
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 32094 Comm: syz-executor.1 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (169):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/05/10 01:48	upstream	9819f682	bc5434be	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/05/08 06:32	upstream	1ad77a05	bc5434be	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/05/04 21:05	upstream	5e321ded	06c27ff5	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/29 08:20	upstream	68a32ba1	77e2b668	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/27 00:01	upstream	9f4ad9e4	8ee2dea6	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/24 02:01	upstream	8db5efb8	17f0b706	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/23 23:44	upstream	18a3c5f7	17f0b706	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/22 08:19	upstream	16fc44d6	2bc8999a	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/20 21:41	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/16 23:09	upstream	2f7b98d1	7e2b734b	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/16 06:51	upstream	7e25f40e	c59079a6	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/14 19:57	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/09 03:34	upstream	3fb4f979	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/08 18:47	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/30 21:14	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/26 15:08	upstream	db24726b	a8529b82	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/25 10:58	upstream	e1381380	6a383ecf	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/17 10:57	upstream	1df27313	fdb2bb2c	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/10 06:17	upstream	05a59d79	26967e35	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/08 04:05	upstream	144c79ef	09fbf400	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/07 14:31	upstream	a38fd874	c599ed12	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/20 12:36	upstream	f40ddce8	3e5ed8b4	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/17 21:56	upstream	f40ddce8	14052202	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/15 23:18	upstream	f40ddce8	98682e5e	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/13 01:50	upstream	dcc0b490	98682e5e	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/12 10:32	upstream	dcc0b490	a5f86b15	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/10 10:56	upstream	e0756cfc	9c8b8541	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/09 01:20	upstream	e0756cfc	2bd9619f	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/08 11:27	upstream	92bf2261	2ce644fc	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/06 23:53	upstream	964d069f	0655e081	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/06 15:05	upstream	1e0d27fc	0655e081	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/05 18:27	upstream	dd86e7fa	23a562df	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/05 04:45	upstream	5c279c4c	23a562df	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/04 15:12	upstream	61556703	42b90a7c	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/02/03 02:31	upstream	3aaf0a27	624dad51	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/31 13:39	upstream	6642d600	fc9fd31e	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/29 22:36	upstream	bec4c296	fc9fd31e	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/28 20:35	upstream	e5ff2cb9	7df34f59	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/27 21:03	upstream	76c057c8	a57db36f	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/26 07:45	upstream	f8ad8187	52e37319	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/25 09:45	upstream	6ee1d745	52e37319	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/24 05:05	upstream	e1ae4b0b	52e37319	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/23 09:43	upstream	fe75a218	52e37319	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/23 00:56	upstream	83d09ad4	52e37319	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/22 06:10	upstream	83d09ad4	d4f4eca5	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/21 16:41	upstream	9791581c	d4f4eca5	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/21 03:45	upstream	75439bc4	d4f4eca5	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/18 22:03	upstream	1e2a199f	63631df1	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/18 17:26	upstream	19c329f6	63631df1	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/17 18:52	upstream	0da0a8a0	fd103621	.config	log	report	info	KCSAN: data-race in ext4_setattr / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/16 19:59	upstream	1d94330a	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/20 14:30	upstream	325d0eab	9564d2e9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/18 14:08	upstream	10b82d51	38962c8b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/26 02:37	upstream	4a21185c	aea82c00	.config	log	report