KCSAN: data-race in __xa_clear_mark / xas_find

KCSAN: data-race in __xa_clear_mark / xas_find_marked
Status: upstream: reported on 2020/08/10 12:41
Reported-by: syzbot+0d4522639ba75b02bf19@syzkaller.appspotmail.com
First crash: 119d, last: 1d13h

Sample crash report:

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

write to 0xffff88800a20dd70 of 8 bytes by interrupt 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]
 __xa_clear_mark+0x239/0x320 lib/xarray.c:1916
 test_clear_page_writeback+0x28d/0x480 mm/page-writeback.c:2739
 end_page_writeback+0xa7/0x110 mm/filemap.c:1487
 end_buffer_async_write+0x1b0/0x250 fs/buffer.c:375
 end_bio_bh_io_sync+0x6f/0x90 fs/buffer.c:3005
 bio_endio+0x28b/0x350 block/bio.c:1447
 req_bio_endio block/blk-core.c:259 [inline]
 blk_update_request+0x515/0xb40 block/blk-core.c:1463
 blk_mq_end_request+0x22/0x50 block/blk-mq.c:562
 lo_complete_rq+0xca/0x180 drivers/block/loop.c:500
 blk_done_softirq+0x1a5/0x200 block/blk-mq.c:586
 __do_softirq+0x198/0x331 kernel/softirq.c:298
 run_ksoftirqd+0x2f/0x60 kernel/softirq.c:653
 smpboot_thread_fn+0x347/0x530 kernel/smpboot.c:165
 kthread+0x1ff/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88800a20dd70 of 8 bytes by task 21394 on cpu 1:
 xas_find_chunk include/linux/xarray.h:1647 [inline]
 xas_find_marked+0x22f/0x6b0 lib/xarray.c:1348
 find_get_pages_range_tag+0xa3/0x5a0 mm/filemap.c:2094
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1161
 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:519
 filemap_fdatawait_range mm/filemap.c:554 [inline]
 filemap_write_and_wait_range+0x119/0x2a0 mm/filemap.c:664
 __generic_file_write_iter+0x259/0x330 mm/filemap.c:3640
 generic_file_write_iter+0x309/0x3f0 mm/filemap.c:3686
 call_write_iter include/linux/fs.h:1887 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:721
 do_iter_write+0x112/0x4b0 fs/read_write.c:847
 vfs_iter_write+0x4c/0x70 fs/read_write.c:888
 iter_file_splice_write+0x42a/0x780 fs/splice.c:769
 do_splice_from fs/splice.c:865 [inline]
 direct_splice_actor+0x95/0x150 fs/splice.c:1035
 splice_direct_to_actor+0x365/0x660 fs/splice.c:990
 do_splice_direct+0xf5/0x170 fs/splice.c:1078
 do_sendfile+0x574/0xb70 fs/read_write.c:1238
 __do_sys_sendfile64 fs/read_write.c:1299 [inline]
 __se_sys_sendfile64 fs/read_write.c:1285 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1285
 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: 21394 Comm: syz-executor.4 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (159):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2020/10/19 07:06	upstream	7cf726a5	fea47c01	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/17 12:30	upstream	071a0578	fea47c01	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/15 17:52	upstream	726eb70e	63869021	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/13 08:29	upstream	865c50e1	bd69ee0d	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/08 10:37	upstream	c85fb28b	92390980	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/05 00:04	upstream	549738f1	5ef9c291	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/04 09:16	upstream	22fbc037	5ef9c291	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/02 12:33	upstream	472e5b05	9602ddf4	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/30 06:51	upstream	02de58b2	8516f6d3	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/28 23:00	upstream	fb0155a0	1b88c6d5	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/27 12:41	upstream	a1bffa48	5dd8aee8	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/26 11:12	upstream	7c7ec322	2d5ea0cb	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/23 06:05	upstream	805c6d3c	3e8f6c27	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/22 08:33	upstream	98477740	3e8f6c27	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/21 08:09	upstream	ba4f184e	c81d99c8	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/20 18:22	upstream	bdcf11de	9564d2e9	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/20 09:22	upstream	325d0eab	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/20 04:11	upstream	325d0eab	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/20 00:44	upstream	eb5f95f1	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/19 16:08	upstream	eb5f95f1	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/19 14:38	upstream	eb5f95f1	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/19 12:34	upstream	eb5f95f1	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/19 10:56	upstream	eb5f95f1	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/19 07:13	upstream	92ab97ad	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/19 04:43	upstream	92ab97ad	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/19 03:42	upstream	92ab97ad	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/18 23:51	upstream	92ab97ad	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/18 22:12	upstream	92ab97ad	53ce8104	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/18 17:34	upstream	10b82d51	38962c8b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/18 15:42	upstream	10b82d51	38962c8b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/18 13:01	upstream	10b82d51	38962c8b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/18 11:58	upstream	10b82d51	38962c8b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/18 06:07	upstream	4cbffc46	8247808b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/17 23:14	upstream	4cbffc46	8247808b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/17 20:32	upstream	4cbffc46	8247808b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/17 19:03	upstream	5925fa68	8247808b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/17 17:42	upstream	5925fa68	8247808b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/17 17:41	upstream	5925fa68	8247808b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/17 09:09	upstream	5925fa68	8247808b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/17 05:42	upstream	5925fa68	8247808b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/17 04:10	upstream	5925fa68	8247808b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/17 01:37	upstream	5925fa68	8247808b	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/16 22:35	upstream	5925fa68	77507d02	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/16 20:10	upstream	5925fa68	77507d02	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/16 17:12	upstream	fc4f28bb	77507d02	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/16 15:25	upstream	fc4f28bb	77507d02	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/16 09:43	upstream	fc4f28bb	18d7d030	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/16 05:48	upstream	fc4f28bb	18d7d030	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/16 04:47	upstream	fc4f28bb	18d7d030	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/08/10 10:40	upstream	fc80c51f	7adc7b65	.config	log	report		akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/07 22:01	upstream	aa27b32b	08fc4ef1	.config	log	report		akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/23 17:16	upstream	3e08a952	6930bbef	.config	log	report		akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org