KCSAN: data-race in data_alloc / prb

KCSAN: data-race in data_alloc / prb_reserve
Status: moderation: reported on 2021/03/25 21:28
Reported-by: syzbot+3ef70d22840405b8403f@syzkaller.appspotmail.com
First crash: 126d, last: 5h02m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff83a78798 of 8 bytes by task 27791 on cpu 0:
 data_alloc+0x27e/0x2b0 kernel/printk/printk_ringbuffer.c:1085
 prb_reserve+0x8f0/0xbc0 kernel/printk/printk_ringbuffer.c:1549
 vprintk_store+0x3e9/0x9c0 kernel/printk/printk.c:2029
 vprintk_emit+0xca/0x3d0 kernel/printk/printk.c:2081
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2115
 vprintk_func+0x137/0x140 kernel/printk/printk_safe.c:401
 printk+0x62/0x82 kernel/printk/printk.c:2146
 set_capacity_and_notify+0x15a/0x1c0 block/genhd.c:75
 loop_set_size drivers/block/loop.c:254 [inline]
 loop_configure+0xafc/0xcb0 drivers/block/loop.c:1161
 lo_ioctl+0x555/0x11f0 drivers/block/loop.c:1689
 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:583
 block_ioctl+0x6d/0x80 fs/block_dev.c:1671
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff83a78798 of 8 bytes by task 27784 on cpu 1:
 desc_read kernel/printk/printk_ringbuffer.c:477 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:771 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:917 [inline]
 prb_reserve+0x20c/0xbc0 kernel/printk/printk_ringbuffer.c:1499
 vprintk_store+0x3e9/0x9c0 kernel/printk/printk.c:2029
 vprintk_emit+0xca/0x3d0 kernel/printk/printk.c:2081
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2115
 vprintk_func+0x137/0x140 kernel/printk/printk_safe.c:401
 printk+0x62/0x82 kernel/printk/printk.c:2146
 isofs_fill_super+0x1922/0x1940 fs/isofs/inode.c:706
 mount_bdev+0x1e8/0x290 fs/super.c:1367
 isofs_mount+0x2d/0x40 fs/isofs/inode.c:1566
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497
 do_new_mount fs/namespace.c:2903 [inline]
 path_mount+0x11d6/0x1ce0 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 27784 Comm: syz-executor.1 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (89):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/23 01:23	upstream	90c911ad	590921a5	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/22 13:39	upstream	16fc44d6	33c28d03	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/22 03:43	upstream	16fc44d6	2bc8999a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/21 13:03	upstream	1fe5501b	95777977	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/21 01:59	upstream	1fe5501b	c0ced557	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/20 09:48	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/20 04:20	upstream	7af08140	4285c989	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/19 20:48	upstream	bf05bf16	4285c989	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/19 14:33	upstream	bf05bf16	50f523d7	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/19 00:59	upstream	bf05bf16	7e2b734b	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/18 05:10	upstream	194cf482	7e2b734b	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/17 17:11	upstream	9cdbf646	7e2b734b	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/16 08:05	upstream	7e25f40e	c59079a6	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/15 20:13	upstream	7f75285c	c59079a6	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/14 18:39	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/14 04:53	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/12 14:04	upstream	d434405a	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/12 03:24	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/11 16:41	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/10 21:50	upstream	d4961772	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/10 12:33	upstream	4e04e751	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/07 06:53	upstream	2d743660	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/05 01:22	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/03 19:05	upstream	d93a0d43	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/03 09:18	upstream	0a84c2e4	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/01 22:23	upstream	ffd9fb54	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/04/01 02:40	upstream	d19cc4bf	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/30 22:51	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/30 14:07	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/29 18:51	upstream	a5e13c6d	a8529b82	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/29 08:34	upstream	36a14638	a8529b82	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/27 15:42	upstream	0f4498ce	a8529b82	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/26 23:22	upstream	db24726b	a8529b82	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/26 08:19	upstream	00232240	6a383ecf	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/23 05:33	upstream	0d02ec6b	8092f30d	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/21 21:14	upstream	812da4d3	4c9a64da	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/20 04:42	upstream	8b12a62a	3d01c4de	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/19 05:59	upstream	bf152b0b	380dcc3e	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/17 07:33	upstream	1df27313	fdb2bb2c	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/14 14:27	upstream	88fe4924	4a003785	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/13 19:45	upstream	f296bfd5	4a003785	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/03/09 15:10	upstream	144c79ef	09fbf400	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/02/22 07:11	upstream	55f62bc8	a659b3f1	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/02/21 15:57	upstream	e767b353	3e5ed8b4	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/02/21 03:55	upstream	f40ddce8	3e5ed8b4	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/02/18 07:35	upstream	f40ddce8	14052202	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/02/15 08:44	upstream	f40ddce8	98682e5e	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/02/14 19:19	upstream	358fecee	98682e5e	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/02/14 07:02	upstream	ac30d8ce	98682e5e	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/02/13 21:33	upstream	c6d8570e	98682e5e	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/02/09 08:41	upstream	e0756cfc	2bd9619f	.config	log	report	info	KCSAN: data-race in data_alloc / prb_reserve
ci2-upstream-kcsan-gce	2021/01/11 05:54	upstream	0653161f	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/03 06:01	upstream	3516bd72	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/02 15:36	upstream	eda809ae	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/01 08:18	upstream	f6e1ea19	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/26 22:35	upstream	40f78232	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/24 11:06	upstream	58cf05f5	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/23 22:07	upstream	614cb589	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/22 07:16	upstream	8653b778	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/21 21:18	upstream	e37b12e4	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/21 06:37	upstream	6a447b0e	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/20 12:24	upstream	467f8165	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/19 17:52	upstream	3644e2d2	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/17 20:35	upstream	accefff5	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/17 20:32	upstream	accefff5	04201c06	.config	log	report	info