KCSAN: data-race in netlink_insert / netlink

KCSAN: data-race in netlink_insert / netlink_sendmsg (3)
Status: moderation: reported on 2020/12/11 10:33
Reported-by: syzbot+a06e7056c0085906c3ff@syzkaller.appspotmail.com
First crash: 116d, last: 3d01h

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in netlink_insert / netlink_sendmsg (2)				2	372d	423d	0/17	auto-closed as invalid on 2020/03/28 20:50
upstream	KCSAN: data-race in netlink_insert / netlink_sendmsg				1	458d	458d	0/17	closed as invalid on 2019/11/19 13:44

Sample crash report:

==================================================================
BUG: KCSAN: data-race in netlink_insert / netlink_sendmsg

write to 0xffff88801c557340 of 1 bytes by task 21662 on cpu 1:
 netlink_insert+0x636/0x8e0 net/netlink/af_netlink.c:587
 netlink_autobind+0xa9/0x150 net/netlink/af_netlink.c:832
 netlink_sendmsg+0x47c/0x7c0 net/netlink/af_netlink.c:1882
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 sock_write_iter+0x1a4/0x200 net/socket.c:999
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4b0 fs/read_write.c:866
 vfs_writev fs/read_write.c:939 [inline]
 do_writev+0x201/0x460 fs/read_write.c:982
 __do_sys_writev fs/read_write.c:1055 [inline]
 __se_sys_writev fs/read_write.c:1052 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1052
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88801c557340 of 1 bytes by task 21652 on cpu 0:
 netlink_sendmsg+0x26c/0x7c0 net/netlink/af_netlink.c:1881
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 sock_write_iter+0x1a4/0x200 net/socket.c:999
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4b0 fs/read_write.c:866
 vfs_writev fs/read_write.c:939 [inline]
 do_writev+0x201/0x460 fs/read_write.c:982
 __do_sys_writev fs/read_write.c:1055 [inline]
 __se_sys_writev fs/read_write.c:1052 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1052
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21652 Comm: syz-executor.0 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (13):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2021/01/22 06:17	upstream	83d09ad4	d4f4eca5	.config	log	report	info	0x7f454c46@gmail.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2021/01/14 20:10	upstream	65f0d241	468dbb55	.config	log	report	info	0x7f454c46@gmail.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2021/01/06 22:55	upstream	9f1abbe9	fff20c29	.config	log	report	info	0x7f454c46@gmail.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2021/01/05 08:44	upstream	36bbbd0e	2a28ff1f	.config	log	report	info	0x7f454c46@gmail.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2021/01/01 14:45	upstream	f6e1ea19	79264ae3	.config	log	report	info	0x7f454c46@gmail.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2020/12/25 12:52	upstream	71c5f031	b982b3ea	.config	log	report	info	0x7f454c46@gmail.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2020/12/12 14:34	upstream	7f376f19	bca53db9	.config	log	report	info	0x7f454c46@gmail.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2020/12/07 22:43	upstream	cd796ed3	51a9082e	.config	log	report	info	0x7f454c46@gmail.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@chromium.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2020/11/16 15:23	upstream	09162bc3	1bf9a662	.config	log	report	info	0x7f454c46@gmail.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@chromium.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2020/11/07 08:25	upstream	bf3e7628	cba33199	.config	log	report	info	0x7f454c46@gmail.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@chromium.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2020/10/12 02:19	upstream	3dd0130f	4a77ae0b	.config	log	report	info	andriin@fb.com, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@chromium.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2020/10/02 17:58	upstream	472e5b05	062c9832	.config	log	report	info	andriin@fb.com, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@chromium.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com
ci2-upstream-kcsan-gce	2020/10/01 06:27	upstream	60e72093	a9767fb2	.config	log	report	info	andriin@fb.com, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@chromium.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, songliubraving@fb.com, yhs@fb.com