KCSAN: data-race in packet_do_bind / packet

KCSAN: data-race in packet_do_bind / packet_getname (4)
Status: moderation: reported on 2020/12/11 11:24
Reported-by: syzbot+a7e88feac4411e409be4@syzkaller.appspotmail.com
First crash: 75d, last: 8d00h

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in packet_do_bind / packet_getname	16	359d	457d	0/17	auto-closed as invalid on 2020/04/11 02:48
upstream	KCSAN: data-race in packet_do_bind / packet_getname (3)	8	142d	180d	0/17	auto-closed as invalid on 2020/10/09 06:50
upstream	KCSAN: data-race in packet_do_bind / packet_getname (2)	2	251d	273d	0/17	closed as invalid on 2020/06/18 14:24

Sample crash report:

==================================================================
BUG: KCSAN: data-race in packet_do_bind / packet_getname

write to 0xffff88805cb88cd4 of 4 bytes by task 5989 on cpu 1:
 packet_do_bind+0x3d9/0x6f0 net/packet/af_packet.c:3182
 packet_bind+0xc3/0xd0 net/packet/af_packet.c:3246
 __sys_bind+0x200/0x290 net/socket.c:1635
 __do_sys_bind net/socket.c:1646 [inline]
 __se_sys_bind net/socket.c:1644 [inline]
 __x64_sys_bind+0x3d/0x50 net/socket.c:1644
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88805cb88cd4 of 4 bytes by task 6014 on cpu 0:
 packet_getname+0x5b/0x1a0 net/packet/af_packet.c:3516
 __sys_getsockname+0x10e/0x1a0 net/socket.c:1885
 __do_sys_getsockname net/socket.c:1900 [inline]
 __se_sys_getsockname net/socket.c:1897 [inline]
 __x64_sys_getsockname+0x3e/0x50 net/socket.c:1897
 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: 6014 Comm: syz-executor.4 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6014 Comm: syz-executor.4 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x116/0x15d lib/dump_stack.c:120
 panic+0x1e7/0x5fa kernel/panic.c:231
 kcsan_report+0x67b/0x680 kernel/kcsan/report.c:634
 kcsan_setup_watchpoint+0x47b/0x4e0 kernel/kcsan/core.c:568
 packet_getname+0x5b/0x1a0 net/packet/af_packet.c:3516
 __sys_getsockname+0x10e/0x1a0 net/socket.c:1885
 __do_sys_getsockname net/socket.c:1900 [inline]
 __se_sys_getsockname net/socket.c:1897 [inline]
 __x64_sys_getsockname+0x3e/0x50 net/socket.c:1897
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcade894c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000033
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219
RDX: 00000000200001c0 RSI: 0000000020000180 RDI: 0000000000000009
RBP: 000000000119c068 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007ffca95125bf R14: 00007fcade8959c0 R15: 000000000119c034
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (4):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2021/01/17 05:47	upstream	54c6247d	65a7a854	.config	log	report	info	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, netdev@vger.kernel.org, songliubraving@fb.com, tannerlove@google.com, willemb@google.com, xie.he.0141@gmail.com, yhs@fb.com
ci2-upstream-kcsan-gce	2021/01/07 05:18	upstream	71c061d2	c104d4a3	.config	log	report	info	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, netdev@vger.kernel.org, songliubraving@fb.com, tannerlove@google.com, willemb@google.com, xie.he.0141@gmail.com, yhs@fb.com
ci2-upstream-kcsan-gce	2020/12/21 07:24	upstream	6a447b0e	04201c06	.config	log	report	info	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, netdev@vger.kernel.org, songliubraving@fb.com, tannerlove@google.com, willemb@google.com, xie.he.0141@gmail.com, yhs@fb.com
ci2-upstream-kcsan-gce	2020/11/10 16:23	upstream	407ab579	cca87986	.config	log	report	info	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, maowenan@huawei.com, netdev@vger.kernel.org, songliubraving@fb.com, willemb@google.com, xie.he.0141@gmail.com, yhs@fb.com