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: 236d, last: 15h05m

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	283d	374d	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

write to 0xffff888144c41468 of 8 bytes by task 4659 on cpu 0:
 instrument_write include/linux/instrumented.h:42 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:79 [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+0x1b0/0x340 lib/xarray.c:944
 xas_store+0x213/0xca0 lib/xarray.c:806
 page_cache_delete_batch mm/filemap.c:328 [inline]
 delete_from_page_cache_batch+0x375/0x690 mm/filemap.c:349
 truncate_inode_pages_range+0x1a5/0xa70 mm/truncate.c:326
 truncate_inode_pages mm/truncate.c:424 [inline]
 truncate_pagecache+0x4f/0x70 mm/truncate.c:736
 ext4_setattr+0xa21/0xec0 fs/ext4/inode.c:5498
 notify_change+0x8a3/0xa80 fs/attr.c:398
 do_truncate+0xe8/0x130 fs/open.c:64
 handle_truncate fs/namei.c:3030 [inline]
 do_open fs/namei.c:3378 [inline]
 path_openat+0x19b2/0x1f20 fs/namei.c:3507
 do_filp_open+0xe9/0x200 fs/namei.c:3534
 do_sys_openat2+0xa3/0x250 fs/open.c:1204
 do_sys_open fs/open.c:1220 [inline]
 __do_sys_creat fs/open.c:1294 [inline]
 __se_sys_creat fs/open.c:1288 [inline]
 __x64_sys_creat+0x62/0x80 fs/open.c:1288
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888144c41468 of 8 bytes by task 4666 on cpu 1:
 xas_find_chunk include/linux/xarray.h:1662 [inline]
 xas_find_marked+0x195/0x5f0 lib/xarray.c:1349
 find_get_entry mm/filemap.c:1925 [inline]
 find_get_pages_range_tag+0xf2/0x390 mm/filemap.c:2216
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1123
 mpage_prepare_extent_to_map+0x195/0x640 fs/ext4/inode.c:2577
 ext4_writepages+0x6c6/0x1d10 fs/ext4/inode.c:2754
 do_writepages+0x7b/0x150 mm/page-writeback.c:2355
 __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+0x47/0xd0 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+0x156c/0x15e0 kernel/signal.c:2581
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffffffffffffffff -> 0xffffffffffffc000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4666 Comm: syz-executor.0 Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (126):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/08/01 05:47	upstream	f3438b4c4e69	6c236867	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/30 17:16	upstream	764a5bc89b12	6c236867	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/30 04:43	upstream	7e96bf476270	c585c7b0	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/29 17:45	upstream	7e96bf476270	8a799410	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/29 11:10	upstream	4010a528219e	b44001ce	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/28 02:21	upstream	7d549995d4e0	17d6ab15	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/26 04:40	upstream	ff1176468d36	4d1b57d4	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/25 13:21	upstream	d8079fac1681	4d1b57d4	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/23 14:39	upstream	8baef6386baa	bc5f1d88	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/23 01:30	upstream	9bead1b58c4c	bc5f1d88	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/22 12:05	upstream	3d5895cd3517	241790bb	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/21 20:20	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/21 13:06	upstream	8cae8cd89f05	29c3f20f	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/20 12:49	upstream	8cae8cd89f05	1b201b48	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/19 09:12	upstream	2734d6c1b1a0	f115ae98	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/18 01:10	upstream	1d67c8d993ba	f115ae98	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/17 11:51	upstream	d980cc0620ae	f115ae98	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/16 02:20	upstream	dd9c7df94c1b	f115ae98	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/14 13:23	upstream	40226a3d96ef	94e0b707	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/14 07:06	upstream	40226a3d96ef	484502bd	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/13 12:06	upstream	7fef2edf7cc7	70168d5c	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/12 21:58	upstream	7fef2edf7cc7	f415556d	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/12 05:32	upstream	e73f0f0ee754	a4869c92	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/11 18:54	upstream	98f7fdced2e0	8f5a7b8c	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/10 01:58	upstream	3dbdb38e2869	8f5a7b8c	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/08 19:26	upstream	3dbdb38e2869	1b20171a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/07 06:55	upstream	3dbdb38e2869	4846d5c1	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/06 19:14	upstream	3dbdb38e2869	cca78469	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/06 08:44	upstream	3dbdb38e2869	6c4484eb	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/02 23:32	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/07/02 12:27	upstream	3dbdb38e2869	658ebc66	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/30 22:01	upstream	df04fbe8680b	38a885d1	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/29 22:12	upstream	c54b245d0118	a4fccb01	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/29 14:02	upstream	c54b245d0118	9d2ab5df	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/29 09:30	upstream	122fa8c58831	9d2ab5df	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/28 13:24	upstream	62fb9874f5da	9d2ab5df	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/27 21:47	upstream	b4b27b9eed8e	9d2ab5df	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/27 10:43	upstream	625acffd7ae2	9d2ab5df	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/26 13:52	upstream	b7050b242430	9d2ab5df	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/26 04:55	upstream	b7050b242430	ae6bf8dd	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/26 02:45	upstream	44db63d1ad8d	ae6bf8dd	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/25 11:19	upstream	44db63d1ad8d	0edbbe31	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/24 23:00	upstream	4a09d388f2ab	0edbbe31	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/24 16:36	upstream	7426cedc7dad	ec865f6a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/24 07:52	upstream	7426cedc7dad	fe4ab389	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/23 20:11	upstream	7266f2030eb0	fe4ab389	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_init_marks
ci2-upstream-kcsan-gce	2021/06/23 06:13	upstream	0c18f29aae7c	aba2b2fb	.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