KCSAN: data-race in xas_find_marked / xas_set

KCSAN: data-race in xas_find_marked / xas_set_mark
Status: moderation: reported on 2019/12/05 04:45
Reported-by: syzbot+238e9bb046564c2c4d4a@syzkaller.appspotmail.com
First crash: 766d, last: 1d08h

Sample crash report:

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

read-write to 0xffff888138920fb8 of 8 bytes by task 16132 on cpu 0:
 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_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:95 [inline]
 node_set_mark lib/xarray.c:93 [inline]
 xas_set_mark+0x7f/0x130 lib/xarray.c:882
 tag_pages_for_writeback+0xad/0x2a0 mm/page-writeback.c:2133
 write_cache_pages+0x1a8/0x7f0 mm/page-writeback.c:2203
 generic_writepages+0x7c/0xc0 mm/page-writeback.c:2346
 blkdev_writepages+0x19/0x20 block/fops.c:428
 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]
 file_write_and_wait_range+0x132/0x1d0 mm/filemap.c:824
 blkdev_fsync+0x35/0x80 block/fops.c:465
 vfs_fsync_range+0x107/0x120 fs/sync.c:182
 generic_write_sync include/linux/fs.h:2955 [inline]
 blkdev_write_iter+0x2cf/0x340 block/fops.c:559
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_iter_write+0x4c/0x70 fs/read_write.c:892
 iter_file_splice_write+0x43a/0x790 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 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 0xffff888138920fb8 of 8 bytes by task 16125 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:1991 [inline]
 find_get_pages_range_tag+0x102/0x3a0 mm/filemap.c:2281
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1133
 write_cache_pages+0x218/0x7f0 mm/page-writeback.c:2212
 generic_writepages+0x7c/0xc0 mm/page-writeback.c:2346
 blkdev_writepages+0x19/0x20 block/fops.c:428
 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]
 file_write_and_wait_range+0x132/0x1d0 mm/filemap.c:824
 blkdev_fsync+0x35/0x80 block/fops.c:465
 vfs_fsync_range+0x107/0x120 fs/sync.c:182
 generic_write_sync include/linux/fs.h:2955 [inline]
 blkdev_write_iter+0x2cf/0x340 block/fops.c:559
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_iter_write+0x4c/0x70 fs/read_write.c:892
 iter_file_splice_write+0x43a/0x790 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 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

value changed: 0xffff000000000000 -> 0xfffffff800000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16125 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 (885):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/11/26 15:27	upstream	a4849f6000e2	63eeac02	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/11/25 17:37	upstream	5f53fa508db0	63eeac02	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/11/22 13:30	upstream	136057256686	545ab074	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/11/22 06:35	upstream	40c93d7fff6f	4eb20a4e	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/11/20 20:32	upstream	61564e7b3abc	4eb20a4e	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/11/17 10:04	upstream	8ab774587903	cafff8b6	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/11/16 10:18	upstream	8ab774587903	600426bd	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/11/11 07:28	upstream	debe436e77c7	75b04091	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/11/09 15:24	upstream	d2f38a3c6507	59bcaf9a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/11/07 13:12	upstream	b5013d084e03	4c1be0be	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/22 07:27	upstream	2f111a6fd5b5	55f90bc6	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/17 00:09	upstream	304040fb4909	0c5d9412	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/15 11:09	upstream	ec681c53f8d2	aab7690b	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/14 23:04	upstream	26d657410983	7aa5fe41	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/14 16:44	upstream	26d657410983	5462d470	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/06 02:33	upstream	60a9483534ed	0a63fd36	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/05 18:32	upstream	f6274b06e326	8a6b1a8d	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/05 10:30	upstream	f6274b06e326	ce697b49	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/04 21:53	upstream	84b3e42564ac	ce697b49	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/03 01:48	upstream	ab2a7a35c4e7	db0f5787	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/10/01 23:41	upstream	24f67d82c43c	cc80db95	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/09/30 20:55	upstream	02d5e016800d	0f01403d	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/09/23 23:52	upstream	f10f0481a5b5	8cac236e	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/09/21 00:27	upstream	e8f71f89236e	af796c18	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/09/13 19:09	upstream	316346243be6	58d09404	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/09/12 13:30	upstream	78e709522d2c	3ce60af8	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/09/12 04:54	upstream	c605c39677b9	3ce60af8	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/09/11 18:20	upstream	926de8c4326c	3ce60af8	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/09/11 06:30	upstream	e99f23c5bf59	3ce60af8	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/09/09 20:45	upstream	a3fa7a101dcf	e2776ee4	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/31 13:16	upstream	b91db6a0b52e	8f58a0ef	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/30 23:11	upstream	8596e589b787	8f58a0ef	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/30 14:34	upstream	7d2a07b76933	8f58a0ef	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/28 10:59	upstream	64b4fc45bea6	d5a29e53	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/24 02:59	upstream	d5ae8d7f85b7	b599f2fc	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/20 19:57	upstream	d992fe5318d8	b599f2fc	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/20 02:38	upstream	f87d64319e6f	b599f2fc	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/16 03:23	upstream	ecf93431963a	2489ab88	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/14 08:34	upstream	dfa377c35d70	2489ab88	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/13 07:19	upstream	f8e6dfc64f61	3fd2ea69	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/12 13:35	upstream	1746f4db5135	6972b106	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/11 04:23	upstream	9e723c5380c6	6972b106	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/09 12:28	upstream	36a21d51725a	6972b106	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/07 00:21	upstream	894d6f401b21	6972b106	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/05 05:03	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/08/04 21:48	upstream	251a1524293d	b97d64c9	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/01/16 09:14	upstream	1d94330a437a	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/23 02:27	https://github.com/google/ktsan.git kcsan	05f2236801fe	d0686497	.config	log	report