KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage

KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
Status: closed as invalid on 2021/06/07 13:58
Reported-by: syzbot+e32fbb814c880bd90628@syzkaller.appspotmail.com
First crash: 404d, last: 51d

Sample crash report:

==================================================================
BUG: KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp

write to 0xffff8881b2f9e770 of 8 bytes by task 26231 on cpu 1:
 shmem_add_to_page_cache+0x52d/0x650 mm/shmem.c:718
 shmem_getpage_gfp+0xbdc/0x1410 mm/shmem.c:1929
 shmem_fault+0x16d/0x500 mm/shmem.c:2116
 __do_fault mm/memory.c:3680 [inline]
 do_shared_fault mm/memory.c:4038 [inline]
 do_fault mm/memory.c:4116 [inline]
 handle_pte_fault mm/memory.c:4371 [inline]
 __handle_mm_fault mm/memory.c:4506 [inline]
 handle_mm_fault+0xf76/0x1a70 mm/memory.c:4604
 faultin_page mm/gup.c:908 [inline]
 __get_user_pages+0x947/0xee0 mm/gup.c:1127
 __get_user_pages_locked mm/gup.c:1313 [inline]
 __get_user_pages_remote+0x3f5/0x5b0 mm/gup.c:1761
 pin_user_pages_remote+0x58/0x80 mm/gup.c:2829
 process_vm_rw_single_vec+0x17d/0x460 mm/process_vm_access.c:105
 process_vm_rw_core mm/process_vm_access.c:215 [inline]
 process_vm_rw+0x347/0x4e0 mm/process_vm_access.c:283
 __do_sys_process_vm_writev mm/process_vm_access.c:303 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:298 [inline]
 __x64_sys_process_vm_writev+0x76/0x90 mm/process_vm_access.c:298
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881b2f9e770 of 8 bytes by task 26232 on cpu 0:
 shmem_recalc_inode mm/shmem.c:367 [inline]
 shmem_getpage_gfp+0x1017/0x1410 mm/shmem.c:1939
 shmem_fault+0x16d/0x500 mm/shmem.c:2116
 __do_fault mm/memory.c:3680 [inline]
 do_shared_fault mm/memory.c:4038 [inline]
 do_fault mm/memory.c:4116 [inline]
 handle_pte_fault mm/memory.c:4371 [inline]
 __handle_mm_fault mm/memory.c:4506 [inline]
 handle_mm_fault+0xf76/0x1a70 mm/memory.c:4604
 faultin_page mm/gup.c:908 [inline]
 __get_user_pages+0x947/0xee0 mm/gup.c:1127
 __get_user_pages_locked mm/gup.c:1313 [inline]
 __get_user_pages_remote+0x3f5/0x5b0 mm/gup.c:1761
 pin_user_pages_remote+0x58/0x80 mm/gup.c:2829
 process_vm_rw_single_vec+0x17d/0x460 mm/process_vm_access.c:105
 process_vm_rw_core mm/process_vm_access.c:215 [inline]
 process_vm_rw+0x347/0x4e0 mm/process_vm_access.c:283
 __do_sys_process_vm_writev mm/process_vm_access.c:303 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:298 [inline]
 __x64_sys_process_vm_writev+0x76/0x90 mm/process_vm_access.c:298
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000171 -> 0x0000000000000172

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26232 Comm: syz-executor.0 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (209):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/07 11:42	upstream	614124bea77e	e59537be	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/29 17:01	upstream	6799d4f2da49	325a8dab	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/28 02:25	upstream	97e5bf604b7a	858ea628	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/26 10:39	upstream	ad9f25d33860	750ce164	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/25 03:03	upstream	1434a3127887	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/23 23:20	upstream	6ebb6814a1ef	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/23 14:18	upstream	4d7620341eda	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/19 17:12	upstream	c3d0e3fd41b7	a343ba6b	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/18 01:47	upstream	8ac91e6c6033	a343ba6b	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/16 01:20	upstream	c12a29ed9094	f54a5c09	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/15 20:47	upstream	25a1298726e9	93f844de	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/15 09:00	upstream	25a1298726e9	8bdd5343	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/14 21:35	upstream	bd3c9cdb21a2	8bdd5343	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/14 06:59	upstream	315d99318179	8bdd5343	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/13 17:58	upstream	c06a2ba62fc4	ecb594cb	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/13 00:25	upstream	dbb5afad100a	ed7d41c5	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/11 23:01	upstream	88b06399c9c7	b3c3bb8e	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/11 01:46	upstream	1140ab592e2e	ca873091	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/07 00:52	upstream	8404c9fbc84b	06585184	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/06 08:39	upstream	a79cdfba68a1	06c27ff5	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/04 19:59	upstream	5e321ded302d	06c27ff5	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/05/04 06:16	upstream	5e321ded302d	09efdd63	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/04/30 07:48	upstream	8ca5297e7e38	77e2b668	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/04/26 23:03	upstream	9f4ad9e425a1	8ee2dea6	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/04/17 20:05	upstream	194cf4825638	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/04/17 07:12	upstream	9cdbf6467424	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/04/15 16:35	upstream	7f75285ca572	c59079a6	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/04/10 22:18	upstream	d4961772226d	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/31 08:55	upstream	5e46d1b78a03	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/26 15:31	upstream	db24726bfefa	a8529b82	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/24 19:35	upstream	4ee998b0ef8b	607e3baf	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/23 21:00	upstream	7acac4b3196c	e613994b	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/23 11:42	upstream	84196390620a	8092f30d	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/20 22:36	upstream	812da4d39463	17810eae	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/16 19:43	upstream	1df27313f50a	fdb2bb2c	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/16 05:56	upstream	1a4431a5db2b	fdb2bb2c	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/13 11:10	upstream	f296bfd5cd04	4a003785	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/13 00:28	upstream	f296bfd5cd04	429d8a6b	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/08 02:06	upstream	144c79ef3353	09fbf400	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/03/06 17:10	upstream	a38fd8748464	e4b4d570	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/02/24 06:14	upstream	c03c21ba6f4e	fcc6d71b	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/02/23 06:54	upstream	b12b47249688	fcc6d71b	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/02/22 15:37	upstream	31caf8b2a847	c26fb06b	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/02/21 05:28	upstream	e767b3530acb	3e5ed8b4	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/02/18 07:43	upstream	f40ddce88593	14052202	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/02/16 21:18	upstream	f40ddce88593	98682e5e	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/02/15 00:22	upstream	358feceebbf6	98682e5e	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/02/14 01:48	upstream	ac30d8ce28d6	98682e5e	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/02/12 21:29	upstream	dcc0b49040c7	98682e5e	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/02/12 16:02	upstream	dcc0b49040c7	a5f86b15	.config	log	report	info	KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp
ci2-upstream-kcsan-gce	2021/01/17 12:15	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/06 05:33	upstream	7575fdda569b	1880b4a9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/01 23:56	upstream	fcadab740480	9602ddf4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/19 03:27	upstream	5e857ce6eae7	bc258b50	.config	log	report