KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev

KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev_pages (3)
Status: auto-closed as invalid on 2021/03/10 02:25
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 324d, last: 267d

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev_pages				3	419d	462d	0/22	auto-closed as invalid on 2020/10/08 19:29
upstream	KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev_pages (2)				1	370d	370d	0/22	auto-closed as invalid on 2020/11/27 11:06

Sample crash report:

==================================================================
BUG: KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev_pages

write to 0xffff888101a27c10 of 8 bytes by task 10410 on cpu 1:
 page_cache_delete_batch mm/filemap.c:340 [inline]
 delete_from_page_cache_batch+0x597/0x820 mm/filemap.c:358
 truncate_inode_pages_range+0x482/0x10e0 mm/truncate.c:366
 truncate_inode_pages+0x20/0x30 mm/truncate.c:476
 kill_bdev fs/block_dev.c:86 [inline]
 __blkdev_put+0x24f/0x460 fs/block_dev.c:1572
 blkdev_put+0x222/0x2a0 fs/block_dev.c:1632
 kill_block_super+0x7b/0x90 fs/super.c:1396
 reiserfs_kill_sb+0xe8/0xf0 fs/reiserfs/super.c:570
 deactivate_locked_super+0x6a/0xb0 fs/super.c:335
 mount_bdev+0x204/0x290 fs/super.c:1368
 get_super_block+0x2d/0x40 fs/reiserfs/super.c:2606
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1496
 do_new_mount fs/namespace.c:2881 [inline]
 path_mount+0x11b6/0x1ca0 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3409
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3409
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888101a27c10 of 8 bytes by task 5 on cpu 0:
 nr_blockdev_pages+0x7c/0xd0 fs/block_dev.c:942
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5404
 update_defense_level+0x34/0x550 net/netfilter/ipvs/ip_vs_ctl.c:101
 defense_work_handler+0x1b/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_long defense_work_handler
==================================================================

Crashes (7):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/03 02:18	upstream	3aaf0a27ffc2	624dad51	.config	log	report	info	KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev_pages
ci2-upstream-kcsan-gce	2021/01/25 18:29	upstream	6ee1d745b7c9	52e37319	.config	log	report	info	KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev_pages
ci2-upstream-kcsan-gce	2021/01/15 21:04	upstream	5ee88057889b	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/12 15:32	upstream	a0d54b4f5b21	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/08 18:38	upstream	f5e6c330254a	c104d4a3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/24 19:43	upstream	58cf05f597b0	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/07 21:45	upstream	cd796ed33450	51a9082e	.config	log	report	info