KCSAN: data-race in xas_find_marked / xas_init

KCSAN: data-race in xas_find_marked / xas_init_marks (2)
Status: moderation: reported on 2021/06/01 09:35
Reported-by: syzbot+a46b57de934a5996888a@syzkaller.appspotmail.com
First crash: 357d, last: 1d00h

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in xas_find_marked / xas_init_marks				11	403d	494d	0/22	auto-closed as invalid on 2020/11/26 04:55

Sample crash report:

==================================================================
BUG: KCSAN: data-race in xas_find_marked / xas_init_marks

read-write to 0xffff88813b3dcd68 of 8 bytes by task 2364 on cpu 1:
 instrument_read_write include/linux/instrumented.h:57 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:81 [inline]
 __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:109 [inline]
 node_clear_mark lib/xarray.c:100 [inline]
 xas_clear_mark lib/xarray.c:911 [inline]
 xas_init_marks+0x17e/0x310 lib/xarray.c:944
 xas_store+0x213/0xca0 lib/xarray.c:806
 page_cache_delete_batch mm/filemap.c:332 [inline]
 delete_from_page_cache_batch+0x3d6/0x780 mm/filemap.c:353
 truncate_inode_pages_range+0x1d5/0xa00 mm/truncate.c:336
 truncate_inode_pages mm/truncate.c:435 [inline]
 truncate_pagecache+0x4f/0x70 mm/truncate.c:750
 ext4_setattr+0xa5f/0xf20 fs/ext4/inode.c:5468
 notify_change+0x8a3/0xac0 fs/attr.c:410
 do_truncate+0xf7/0x140 fs/open.c:64
 handle_truncate fs/namei.c:3082 [inline]
 do_open fs/namei.c:3430 [inline]
 path_openat+0x191f/0x1eb0 fs/namei.c:3559
 do_filp_open+0x105/0x220 fs/namei.c:3586
 do_sys_openat2+0xb5/0x2b0 fs/open.c:1212
 do_sys_open fs/open.c:1228 [inline]
 __do_sys_creat fs/open.c:1304 [inline]
 __se_sys_creat fs/open.c:1298 [inline]
 __x64_sys_creat+0x62/0x80 fs/open.c:1298
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813b3dcd68 of 8 bytes by task 2360 on cpu 0:
 xas_find_chunk include/linux/xarray.h:1662 [inline]
 xas_find_marked+0x195/0x5f0 lib/xarray.c:1349
 find_get_entry mm/filemap.c:1991 [inline]
 find_get_pages_range_tag+0x102/0x3a0 mm/filemap.c:2281
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1133
 mpage_prepare_extent_to_map+0x1a3/0x650 fs/ext4/inode.c:2572
 ext4_writepages+0x766/0x1e80 fs/ext4/inode.c:2749
 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364
 filemap_fdatawrite_wbc mm/filemap.c:407 [inline]
 __filemap_fdatawrite_range mm/filemap.c:440 [inline]
 __filemap_fdatawrite mm/filemap.c:446 [inline]
 filemap_flush+0xd7/0x100 mm/filemap.c:473
 ext4_alloc_da_blocks+0x47/0x100 fs/ext4/inode.c:3103
 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:141
 __fput+0x295/0x520 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0x8e/0x110 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x160/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffffffffffc00000 -> 0xfffffffff0000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2360 Comm: syz-executor.1 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (272):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/11/29 04:00	upstream	d06c942efea4	63eeac02	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/26 23:30	upstream	c5c17547b778	63eeac02	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/24 20:00	upstream	5f53fa508db0	545ab074	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/24 00:40	upstream	5d9f4cf36721	545ab074	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/21 10:03	upstream	923dcc5eb0c1	4eb20a4e	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/20 15:56	upstream	a90af8f15bdc	4eb20a4e	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/19 04:30	upstream	6fdf886424cf	31a30fc0	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/18 15:14	upstream	42eb8fdac2fc	31a30fc0	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/17 19:05	upstream	ee1703cda8dc	cafff8b6	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/15 12:07	upstream	8ab774587903	75b04091	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/15 05:37	upstream	ce49bfc8d037	75b04091	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/14 12:02	upstream	c8c109546a19	75b04091	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/12 21:40	upstream	5833291ab6de	75b04091	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/12 04:21	upstream	ca2ef2d9f2aa	75b04091	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/11 00:36	upstream	89d714ab6043	75b04091	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/10 08:01	upstream	cb690f5238d7	55fa030c	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/09 10:00	upstream	e851dfae4371	8ab17e57	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/08 07:02	upstream	6b75d88fa81b	4c1be0be	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/06 19:03	upstream	fe91c4725aee	4c1be0be	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/05 07:30	upstream	d4439a1189f9	4c1be0be	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/04 11:03	upstream	ce840177930f	4c1be0be	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/03 09:45	upstream	56d33754481f	17f3edd2	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/02 16:39	upstream	bfc484fe6abb	17f3edd2	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/02 12:23	upstream	bfc484fe6abb	098b5d53	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/02 03:24	upstream	e66435936756	098b5d53	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/11/01 16:19	upstream	8bb7eca972ad	098b5d53	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/31 06:16	upstream	119c85055d86	098b5d53	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/30 17:31	upstream	a379fbbcb88b	098b5d53	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/29 20:33	upstream	f25a5481af12	2353a3ec	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/29 00:27	upstream	411a44c24a56	be531bb4	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/28 09:40	upstream	1fc596a56b33	be531bb4	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/27 08:56	upstream	d25f27432f80	d50eb50a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/26 14:50	upstream	3906fe9bb7f1	d50eb50a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/25 18:07	upstream	87066fdd2e30	4f0000ee	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/25 04:53	upstream	6c62666d8879	4f0000ee	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/23 15:12	upstream	9c0c4d24ac00	282f03fb	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/22 16:23	upstream	64222515138e	282f03fb	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/21 06:59	upstream	2f111a6fd5b5	f111d03b	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/20 21:58	upstream	d9abdee5fd5a	418a00eb	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/20 07:27	upstream	d9abdee5fd5a	466b7db1	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/19 01:41	upstream	519d81956ee2	24dc29db	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/18 03:36	upstream	cf52ad5ff16c	0c5d9412	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/10/17 21:48	upstream	d999ade1cc86	0c5d9412	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/05/31 23:36	upstream	c2131f7e73c9	032639db	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/05/28 09:25	upstream	97e5bf604b7a	858ea628	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/01/16 21:15	upstream	54c6247d06f1	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/07 21:22	upstream	cd796ed33450	51a9082e	.config	log	report	info