KCSAN: data-race in xas_clear_mark / xas_find

KCSAN: data-race in xas_clear_mark / xas_find_marked (2)
Status: moderation: reported on 2019/12/10 21:55
Reported-by: syzbot+6b653cb0a28eee8c400a@syzkaller.appspotmail.com
First crash: 262d, last: 7h58m

similar bugs (1):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in xas_clear_mark / xas_find_marked			3	267d	273d	0/17	closed as invalid on 2019/10/18 14:11

Sample crash report:

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

write to 0xffff8880a63c5228 of 8 bytes by task 5596 on cpu 0:
 instrument_write include/linux/instrumented.h:42 [inline]
 __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:85 [inline]
 node_clear_mark lib/xarray.c:100 [inline]
 xas_clear_mark+0x8f/0x170 lib/xarray.c:908
 __test_set_page_writeback+0x396/0x480 mm/page-writeback.c:2808
 ext4_bio_write_page+0xed/0xda0 fs/ext4/page-io.c:451
 mpage_submit_page fs/ext4/inode.c:2082 [inline]
 mpage_map_and_submit_buffers fs/ext4/inode.c:2330 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2469 [inline]
 ext4_writepages+0xeb9/0x1ef0 fs/ext4/inode.c:2782
 do_writepages+0x7b/0x150 mm/page-writeback.c:2354
 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:421
 __filemap_fdatawrite mm/filemap.c:429 [inline]
 filemap_flush+0x1f/0x30 mm/filemap.c:456
 ext4_alloc_da_blocks+0x4c/0x130 fs/ext4/inode.c:3146
 ext4_release_file+0x5b/0x1c0 fs/ext4/file.c:142
 __fput+0x1df/0x460 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:135
 get_signal+0x3f6/0x1650 kernel/signal.c:2547
 do_signal+0x25/0x270 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline]
 __prepare_exit_to_usermode+0x127/0x230 arch/x86/entry/common.c:269
 __syscall_return_slowpath+0x47/0x60 arch/x86/entry/common.c:352
 do_syscall_64+0x5d/0xb0 arch/x86/entry/common.c:393
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a63c5228 of 8 bytes by task 5593 on cpu 1:
 xas_find_chunk include/linux/xarray.h:1625 [inline]
 xas_find_marked+0x22f/0x6b0 lib/xarray.c:1198
 find_get_pages_range_tag+0xa3/0x580 mm/filemap.c:1908
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1120
 mpage_prepare_extent_to_map+0x19c/0x650 fs/ext4/inode.c:2559
 ext4_writepages+0x97d/0x1ef0 fs/ext4/inode.c:2780
 do_writepages+0x7b/0x150 mm/page-writeback.c:2354
 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:421
 __filemap_fdatawrite mm/filemap.c:429 [inline]
 filemap_flush+0x1f/0x30 mm/filemap.c:456
 ext4_alloc_da_blocks+0x4c/0x130 fs/ext4/inode.c:3146
 ext4_release_file+0x5b/0x1c0 fs/ext4/file.c:142
 __fput+0x1df/0x460 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:135
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:239 [inline]
 __prepare_exit_to_usermode+0x1c6/0x230 arch/x86/entry/common.c:269
 __syscall_return_slowpath+0x47/0x60 arch/x86/entry/common.c:352
 do_syscall_64+0x5d/0xb0 arch/x86/entry/common.c:393
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5593 Comm: syz-executor.0 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (389):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci2-upstream-kcsan-gce	2020/07/10 22:23	upstream	a581387e	18d18b59	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/10 09:54	upstream	42f82040	56d01184	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/10 01:22	upstream	2a89b99f	edf162e8	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/09 20:11	upstream	0bddd227	edf162e8	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/09 08:44	upstream	0bddd227	bc238812	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/08 21:05	upstream	63e1968a	9f9845eb	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/08 08:36	upstream	dcde237b	5962a2dc	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/07 22:22	upstream	aa27b32b	08fc4ef1	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/07 22:13	upstream	aa27b32b	08fc4ef1	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/06 21:02	upstream	5c82ec00	ef278c73	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/06 10:38	upstream	dcb7fd82	ac5a135b	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/05 19:35	upstream	45a5ac7a	22f87567	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/05 14:18	upstream	35e884f8	22f87567	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/05 02:19	upstream	35e884f8	24d7f505	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/04 16:04	upstream	35e884f8	4f739670	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/04 08:16	upstream	0c7d7d1f	51095195	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/03 13:03	upstream	cdd3bb54	6e569755	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/03 00:52	upstream	7cc2a8ea	f30c14bf	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/02 10:34	upstream	cd77006e	f30c14bf	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/02 08:13	upstream	cd77006e	bed10395	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/02 00:56	upstream	edb543cf	bed10395	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/01 20:57	upstream	edb543cf	695ef2dd	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/01 17:13	upstream	7c30b859	39acb39d	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/01 10:22	upstream	7c30b859	c0383ebe	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/01 06:22	upstream	7c30b859	c0383ebe	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/01 04:00	upstream	7c30b859	c0383ebe	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/01 02:35	upstream	7c30b859	c0383ebe	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/30 23:21	upstream	7c30b859	c0383ebe	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/30 16:57	upstream	7c30b859	917afeaa	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/30 09:25	upstream	7c30b859	917afeaa	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/30 02:46	upstream	7c30b859	917afeaa	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/29 16:06	upstream	9ebcfadb	ce9ef6f2	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/29 12:05	upstream	9ebcfadb	df01f6fc	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/29 11:00	upstream	9ebcfadb	3ff434cc	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/29 09:58	upstream	9ebcfadb	0375051c	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/29 06:33	upstream	9ebcfadb	0375051c	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/29 04:37	upstream	9ebcfadb	a2cdad9d	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/28 22:14	upstream	91a9a90d	a2cdad9d	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/28 20:37	upstream	91a9a90d	a2cdad9d	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/28 13:37	upstream	719fdd32	a2cdad9d	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/28 12:15	upstream	719fdd32	a2cdad9d	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/28 10:50	upstream	719fdd32	a2cdad9d	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/28 02:13	upstream	916a3b0f	a2cdad9d	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/27 21:04	upstream	6116dea8	a2cdad9d	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/27 14:54	upstream	1590a2e1	2defc703	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/27 12:25	upstream	1590a2e1	032b4239	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/27 10:10	upstream	1590a2e1	032b4239	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/27 07:07	upstream	1590a2e1	ffec44b5	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2019/10/22 14:09	https://github.com/google/ktsan.git kcsan	05f22368	4ee855e7	.config	log	report	akpm@linux-foundation.org, axboe@kernel.dk, bfoster@redhat.com, dchinner@redhat.com, jack@suse.cz, laoar.shao@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, rppt@linux.ibm.com, tglx@linutronix.de, tj@kernel.org