KCSAN: data-race in filemap_map_pages / generic_write

KCSAN: data-race in filemap_map_pages / generic_write_end (3)
Status: moderation: reported on 2020/10/06 09:18
Reported-by: syzbot+f019ed0076eb4b161808@syzkaller.appspotmail.com
First crash: 254d, last: 9d08h

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in filemap_map_pages / generic_write_end				1	454d	454d	0/21	auto-closed as invalid on 2020/02/10 18:15
upstream	KCSAN: data-race in filemap_map_pages / generic_write_end (2)				3	260d	316d	0/21	closed as invalid on 2020/06/18 14:24

Sample crash report:

==================================================================
BUG: KCSAN: data-race in filemap_map_pages / generic_write_end

write to 0xffff88810dbab2d0 of 8 bytes by task 14042 on cpu 0:
 i_size_write include/linux/fs.h:870 [inline]
 generic_write_end+0x99/0x240 fs/buffer.c:2186
 ext4_da_write_end+0x59b/0x760 fs/ext4/inode.c:3111
 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3423
 ext4_buffered_write_iter+0x2e5/0x3e0 fs/ext4/file.c:270
 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6f0/0x7e0 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810dbab2d0 of 8 bytes by task 14050 on cpu 1:
 i_size_read include/linux/fs.h:848 [inline]
 filemap_map_pages+0x481/0x9b0 mm/filemap.c:2960
 do_fault_around mm/memory.c:3980 [inline]
 do_read_fault+0x22f/0x720 mm/memory.c:4014
 do_fault mm/memory.c:4147 [inline]
 handle_pte_fault mm/memory.c:4387 [inline]
 __handle_mm_fault mm/memory.c:4522 [inline]
 handle_mm_fault+0x100c/0x1810 mm/memory.c:4620
 faultin_page mm/gup.c:851 [inline]
 __get_user_pages+0xa42/0x1000 mm/gup.c:1070
 populate_vma_page_range mm/gup.c:1403 [inline]
 __mm_populate+0x24d/0x380 mm/gup.c:1451
 mm_populate include/linux/mm.h:2591 [inline]
 vm_mmap_pgoff+0x14c/0x1d0 mm/util.c:524
 ksys_mmap_pgoff+0x2a8/0x380 mm/mmap.c:1634
 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: 1 PID: 14050 Comm: syz-executor.5 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (103):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/19 14:55	upstream	f40ddce8	f689d40a	.config	log	report	info	KCSAN: data-race in filemap_map_pages / generic_write_end
ci2-upstream-kcsan-gce	2021/02/12 19:01	upstream	dcc0b490	98682e5e	.config	log	report	info	KCSAN: data-race in filemap_map_pages / generic_write_end
ci2-upstream-kcsan-gce	2021/02/11 17:53	upstream	291009f6	a5f86b15	.config	log	report	info	KCSAN: data-race in filemap_map_pages / generic_write_end
ci2-upstream-kcsan-gce	2021/02/10 08:37	upstream	e0756cfc	9c8b8541	.config	log	report	info	KCSAN: data-race in filemap_map_pages / generic_write_end
ci2-upstream-kcsan-gce	2021/01/30 22:31	upstream	8c947645	fc9fd31e	.config	log	report	info	KCSAN: data-race in filemap_map_pages / generic_write_end
ci2-upstream-kcsan-gce	2021/01/28 06:12	upstream	76c057c8	eefc07f2	.config	log	report	info	KCSAN: data-race in filemap_map_pages / generic_write_end
ci2-upstream-kcsan-gce	2021/01/24 19:18	upstream	e6806137	52e37319	.config	log	report	info	KCSAN: data-race in filemap_map_pages / generic_write_end
ci2-upstream-kcsan-gce	2021/01/17 10:12	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/15 17:29	upstream	5ee88057	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/12 18:52	upstream	e609571b	0cdd6185	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/06 11:05	upstream	9f1abbe9	fff20c29	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/05 10:05	upstream	36bbbd0e	a0234d98	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/30 13:36	upstream	139711f0	ecb8c012	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/29 10:55	upstream	dea8dcf2	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/29 08:52	upstream	dea8dcf2	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/29 06:28	upstream	dea8dcf2	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/29 05:20	upstream	dea8dcf2	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/29 03:56	upstream	dea8dcf2	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/28 21:11	upstream	c76e02c5	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/25 09:06	upstream	71c5f031	b982b3ea	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/21 08:47	upstream	e37b12e4	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/19 21:49	upstream	467f8165	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/17 22:15	upstream	d64c6f96	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/16 19:44	upstream	5e60366d	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/16 08:18	upstream	d01e7f10	649595c6	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/15 22:01	upstream	d635a69d	f213e07e	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 20:06	upstream	ec6f5e0e	8f160dd5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 09:00	upstream	6bff9bb8	bca53db9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/12 19:35	upstream	7b1b868e	bca53db9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/11 11:33	upstream	33dc9614	ba24ffcd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/10 23:37	upstream	9fca90cf	f900b48c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/09 08:49	upstream	a68a0262	99917735	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/08 08:26	upstream	cd796ed3	9af51e31	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/02 21:15	upstream	3bb61aa6	eff43e99	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/28 12:01	upstream	c84e1efa	3c7136c0	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/17 21:33	upstream	111e91a6	09323409	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/17 20:02	upstream	111e91a6	bd2a760b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/13 23:57	upstream	9e6a39ea	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/09 08:31	upstream	f8394f23	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/05 21:01	upstream	521b619a	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/29 18:25	upstream	23859ae4	a0c7169a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 20:27	upstream	96485e44	4e740c00	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/21 09:25	upstream	c4d6fe73	e761439e	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/20 12:33	upstream	270315b8	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/19 08:59	upstream	7cf726a5	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/04 09:17	upstream	22fbc037	5ef9c291	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/03 20:33	upstream	22fbc037	1a3f9408	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/19 13:36	upstream	5e857ce6	123cf502	.config	log	report