KCSAN: data-race in filemap_map_pages / simple_write

KCSAN: data-race in filemap_map_pages / simple_write_end (3)
Status: auto-closed as invalid on 2020/12/31 21:02
Reported-by: syzbot+f033be733671e8099bc8@syzkaller.appspotmail.com
First crash: 425d, last: 326d

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in filemap_map_pages / simple_write_end	2	543d	610d	0/22	auto-closed as invalid on 2020/06/18 13:43
upstream	KCSAN: data-race in filemap_map_pages / simple_write_end (2)	2	472d	472d	0/22	auto-closed as invalid on 2020/08/07 12:26
upstream	KCSAN: data-race in filemap_map_pages / simple_write_end (4)	6	245d	278d	0/22	auto-closed as invalid on 2021/03/22 06:27

Sample crash report:

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

write to 0xffff88800a12e510 of 8 bytes by task 23804 on cpu 0:
 i_size_write include/linux/fs.h:871 [inline]
 simple_write_end+0x1dc/0x340 fs/libfs.c:589
 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3340
 __generic_file_write_iter+0x15c/0x330 mm/filemap.c:3458
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3490
 call_write_iter include/linux/fs.h:1903 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6d4/0x7c0 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 0xffff88800a12e510 of 8 bytes by task 23805 on cpu 1:
 i_size_read include/linux/fs.h:849 [inline]
 filemap_map_pages+0x481/0x9a0 mm/filemap.c:2876
 do_fault_around mm/memory.c:3967 [inline]
 do_read_fault+0x233/0x760 mm/memory.c:4001
 do_fault mm/memory.c:4134 [inline]
 handle_pte_fault mm/memory.c:4374 [inline]
 __handle_mm_fault mm/memory.c:4509 [inline]
 handle_mm_fault+0xfeb/0x1770 mm/memory.c:4607
 faultin_page mm/gup.c:885 [inline]
 __get_user_pages+0x8ec/0xe50 mm/gup.c:1097
 populate_vma_page_range mm/gup.c:1430 [inline]
 __mm_populate+0x24d/0x340 mm/gup.c:1478
 mm_populate include/linux/mm.h:2590 [inline]
 vm_mmap_pgoff+0x133/0x170 mm/util.c:512
 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: 23805 Comm: syz-executor.4 Not tainted 5.10.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (20):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info
ci2-upstream-kcsan-gce	2020/11/26 21:02	upstream	4df910620beb	2f1cec62	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/20 14:07	upstream	4d02da974ea8	0767f13f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/16 12:23	upstream	09162bc32c88	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/14 14:14	upstream	f01c30de86f1	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/09 02:12	upstream	9dbc1c03eeb5	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/08 17:19	upstream	4429f14aeea9	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/07 17:26	upstream	659caaf65dc9	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/04 19:35	upstream	4ef8451b3326	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/30 21:36	upstream	07e088730245	a6e3ac3b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/05 05:06	upstream	549738f15da0	5ef9c291	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/01 11:42	upstream	60e720931556	4103fce0	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/24 18:40	upstream	171d4ff79f96	54289b08	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/18 00:11	upstream	4cbffc461ec9	8247808b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/17 17:54	upstream	5925fa68fe82	8247808b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/15 21:30	upstream	fc4f28bb3daf	18d7d030	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/15 10:49	upstream	fc4f28bb3daf	9e681632	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/02 10:06	upstream	b765a32a2e91	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/27 00:27	upstream	15bc20c6af4c	318430cb	.config	log	report
ci2-upstream-kcsan-gce	2020/08/26 19:37	upstream	2ac69819ba9e	318430cb	.config	log	report
ci2-upstream-kcsan-gce	2020/08/19 14:40	upstream	18445bf405cb	db787902	.config	log	report