KCSAN: data-race in copy_page_from_iter / copy_page_from

KCSAN: data-race in copy_page_from_iter / copy_page_from_iter (2)
Status: auto-closed as invalid on 2021/06/22 00:41
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 179d, last: 131d

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter (3)				4	46d	73d	0/22	auto-closed as invalid on 2021/09/14 15:09
upstream	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter				4	401d	424d	0/22	auto-closed as invalid on 2020/09/24 11:06

Sample crash report:

==================================================================
BUG: KCSAN: data-race in copy_page_from_iter / copy_page_from_iter

write to 0xffff88813febb000 of 4096 bytes by task 32231 on cpu 0:
 instrument_copy_from_user include/linux/instrumented.h:136 [inline]
 copyin lib/iov_iter.c:200 [inline]
 copy_page_from_iter_iovec lib/iov_iter.c:345 [inline]
 copy_page_from_iter+0x31b/0x560 lib/iov_iter.c:994
 process_vm_rw_pages mm/process_vm_access.c:43 [inline]
 process_vm_rw_single_vec+0x294/0x460 mm/process_vm_access.c:117
 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

write to 0xffff88813febb000 of 4096 bytes by task 32224 on cpu 1:
 instrument_copy_from_user include/linux/instrumented.h:136 [inline]
 copyin lib/iov_iter.c:200 [inline]
 copy_page_from_iter_iovec lib/iov_iter.c:345 [inline]
 copy_page_from_iter+0x31b/0x560 lib/iov_iter.c:994
 process_vm_rw_pages mm/process_vm_access.c:43 [inline]
 process_vm_rw_single_vec+0x294/0x460 mm/process_vm_access.c:117
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 32224 Comm: syz-executor.1 Not tainted 5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (17):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/05/18 00:36	upstream	8ac91e6c6033	a343ba6b	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/05/11 08:25	upstream	1140ab592e2e	ca873091	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/05/07 09:23	upstream	e48661230cc3	f6da8120	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/05/05 14:08	upstream	d665ea6ea86c	06c27ff5	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/25 07:45	upstream	2a1d7946fa53	36c88236	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/24 18:52	upstream	2a1d7946fa53	17f0b706	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/24 01:28	upstream	8db5efb83fa9	17f0b706	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/21 22:23	upstream	16fc44d6387e	2bc8999a	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/21 01:12	upstream	1fe5501ba1ab	c0ced557	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/20 08:15	upstream	7af08140979a	c0ced557	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/18 06:40	upstream	194cf4825638	7e2b734b	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/17 09:09	upstream	9cdbf6467424	7e2b734b	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/17 06:30	upstream	2f7b98d1e55c	7e2b734b	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/10 14:34	upstream	d4961772226d	6a81331a	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/10 03:56	upstream	4e04e7513b0f	6a81331a	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/04/08 22:33	upstream	3fb4f979b4fa	6a81331a	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter
ci2-upstream-kcsan-gce	2021/03/30 21:24	upstream	2bb25b3a748a	6a81331a	.config	log	report	info	KCSAN: data-race in copy_page_from_iter / copy_page_from_iter