KCSAN: data-race in __xa_set_mark / xas_find

KCSAN: data-race in __xa_set_mark / xas_find_marked
Status: moderation: reported on 2020/09/25 08:57
Reported-by: syzbot+f512479ce46e8f0a9370@syzkaller.appspotmail.com
First crash: 322d, last: 20h19m

Sample crash report:

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

write to 0xffff88812a087468 of 8 bytes by task 30998 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_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:95 [inline]
 node_set_mark lib/xarray.c:93 [inline]
 xas_set_mark lib/xarray.c:882 [inline]
 __xa_set_mark+0x1d9/0x290 lib/xarray.c:1899
 __set_page_dirty+0x155/0x1a0 fs/buffer.c:609
 mark_buffer_dirty+0x126/0x200 fs/buffer.c:1133
 __block_commit_write fs/buffer.c:2104 [inline]
 block_write_end+0x13d/0x260 fs/buffer.c:2183
 generic_write_end+0x5e/0x180 fs/buffer.c:2197
 ext4_da_write_end+0x59b/0x730 fs/ext4/inode.c:3110
 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3671
 ext4_buffered_write_iter+0x2f2/0x3f0 fs/ext4/file.c:269
 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519
 call_write_iter include/linux/fs.h:2114 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 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+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812a087468 of 8 bytes by task 30991 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+0x9d8/0x1d10 fs/ext4/inode.c:2798
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __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+0x4a/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
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 30991 Comm: syz-executor.0 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (136):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/05/09 00:09	upstream	b7415964	bc5434be	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/07 22:02	upstream	1ad77a05	bc5434be	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/07 08:33	upstream	e4866123	f6da8120	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/06 15:28	upstream	8404c9fb	06585184	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/05 03:36	upstream	d665ea6e	06c27ff5	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/04 14:44	upstream	5e321ded	06c27ff5	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/03 13:23	upstream	9ccce092	ad61f371	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/03 05:26	upstream	9ccce092	77e2b668	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/02 11:53	upstream	17ae69ab	77e2b668	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/01 23:07	upstream	10a3efd0	77e2b668	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/01 11:09	upstream	9f67672a	77e2b668	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/30 20:29	upstream	65c61de9	77e2b668	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/30 00:00	upstream	8ca5297e	77e2b668	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/29 11:13	upstream	d72cd4ad	77e2b668	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/28 22:27	upstream	68a32ba1	77e2b668	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/27 23:37	upstream	e359bce3	805b5003	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/26 23:01	upstream	9f4ad9e4	8ee2dea6	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/25 07:46	upstream	2a1d7946	36c88236	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/24 02:14	upstream	8db5efb8	17f0b706	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/23 12:19	upstream	18a3c5f7	17f0b706	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/22 23:48	upstream	90c911ad	590921a5	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/21 18:52	upstream	16fc44d6	95777977	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/21 09:02	upstream	1fe5501b	95777977	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/19 19:46	upstream	bf05bf16	4285c989	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/18 11:34	upstream	c98ff1d0	7e2b734b	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/17 20:20	upstream	194cf482	7e2b734b	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/16 18:13	upstream	2f7b98d1	7e2b734b	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/16 12:42	upstream	7e25f40e	7e2b734b	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/15 19:43	upstream	7f75285c	c59079a6	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/14 22:41	upstream	7f75285c	fcdb12ba	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/13 19:08	upstream	89698bec	a184b83e	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/12 23:33	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/11 04:06	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/05 18:43	upstream	0a50438c	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/05 00:15	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/04 02:54	upstream	2023a53b	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/02 23:56	upstream	0a84c2e4	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/29 21:27	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/22 16:51	upstream	0d02ec6b	bea32f74	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/21 14:49	upstream	812da4d3	4c9a64da	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/19 09:55	upstream	8b12a62a	2af9d324	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/18 08:48	upstream	6417f031	7216542e	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/18 00:50	upstream	6417f031	fdb2bb2c	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/15 11:18	upstream	1e28eed1	cc1cff8f	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/14 19:18	upstream	88fe4924	cc1cff8f	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/01/17 11:08	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/24 17:40	upstream	171d4ff7	54289b08	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/21 17:45	upstream	64677779	4f2acff9	.config	log	report