From: syzbot <syzbot+b02ff0707a97e4e79ebb@syzkaller.appspotmail.com>
To: davem@davemloft.net, glider@google.com,
linux-can@vger.kernel.org, linux-kernel@vger.kernel.org,
mkl@pengutronix.de, netdev@vger.kernel.org,
socketcan@hartkopp.net, syzkaller-bugs@googlegroups.com
Subject: KMSAN: uninit-value in can_receive
Date: Mon, 18 Nov 2019 11:05:09 -0800 [thread overview]
Message-ID: <0000000000005c08d10597a3a05d@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: 9c6a7162 kmsan: remove unneeded annotations in bio
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=14563416e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9e324dfe9c7b0360
dashboard link: https://syzkaller.appspot.com/bug?extid=b02ff0707a97e4e79ebb
compiler: clang version 9.0.0 (/home/glider/llvm/clang
80fee25776c2fb61e74c1ecb1a523375c2500b69)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b02ff0707a97e4e79ebb@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in can_receive+0x23c/0x5e0 net/can/af_can.c:649
CPU: 1 PID: 3490 Comm: syz-executor.2 Not tainted 5.4.0-rc5+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x191/0x1f0 lib/dump_stack.c:113
kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108
__msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245
can_receive+0x23c/0x5e0 net/can/af_can.c:649
can_rcv+0x188/0x3a0 net/can/af_can.c:685
__netif_receive_skb_one_core net/core/dev.c:5010 [inline]
__netif_receive_skb net/core/dev.c:5124 [inline]
process_backlog+0x12e8/0x1410 net/core/dev.c:5955
napi_poll net/core/dev.c:6392 [inline]
net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6460
__do_softirq+0x4a1/0x83a kernel/softirq.c:293
do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1093
</IRQ>
do_softirq kernel/softirq.c:338 [inline]
__local_bh_enable_ip+0x184/0x1d0 kernel/softirq.c:190
local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32
rcu_read_unlock_bh include/linux/rcupdate.h:688 [inline]
__dev_queue_xmit+0x38e8/0x4200 net/core/dev.c:3900
dev_queue_xmit+0x4b/0x60 net/core/dev.c:3906
packet_snd net/packet/af_packet.c:2959 [inline]
packet_sendmsg+0x82d7/0x92e0 net/packet/af_packet.c:2984
sock_sendmsg_nosec net/socket.c:637 [inline]
sock_sendmsg net/socket.c:657 [inline]
___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311
__sys_sendmsg net/socket.c:2356 [inline]
__do_sys_sendmsg net/socket.c:2365 [inline]
__se_sys_sendmsg+0x305/0x460 net/socket.c:2363
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363
do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x45a639
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff1b9c14c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639
RDX: 0000000000000050 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff1b9c156d4
R13: 00000000004c8acf R14: 00000000004df078 R15: 00000000ffffffff
Uninit was created at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline]
kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:134
kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:88
slab_alloc_node mm/slub.c:2799 [inline]
__kmalloc_node_track_caller+0xd7b/0x1390 mm/slub.c:4407
__kmalloc_reserve net/core/skbuff.c:141 [inline]
__alloc_skb+0x306/0xa10 net/core/skbuff.c:209
alloc_skb include/linux/skbuff.h:1050 [inline]
alloc_skb_with_frags+0x18c/0xa80 net/core/skbuff.c:5662
sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2244
packet_alloc_skb net/packet/af_packet.c:2807 [inline]
packet_snd net/packet/af_packet.c:2902 [inline]
packet_sendmsg+0x6785/0x92e0 net/packet/af_packet.c:2984
sock_sendmsg_nosec net/socket.c:637 [inline]
sock_sendmsg net/socket.c:657 [inline]
___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311
__sys_sendmsg net/socket.c:2356 [inline]
__do_sys_sendmsg net/socket.c:2365 [inline]
__se_sys_sendmsg+0x305/0x460 net/socket.c:2363
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363
do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
=====================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
next reply other threads:[~2019-11-18 19:05 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-18 19:05 syzbot [this message]
2019-11-18 20:25 ` KMSAN: uninit-value in can_receive Oliver Hartkopp
2019-11-18 20:29 ` Marc Kleine-Budde
2019-11-18 20:49 ` Oliver Hartkopp
2019-11-18 21:15 ` Marc Kleine-Budde
2019-11-19 7:35 ` Oliver Hartkopp
2019-11-19 9:00 ` Oleksij Rempel
2019-11-19 10:08 ` Dmitry Vyukov
2019-11-19 13:06 ` Alexander Potapenko
2019-11-19 16:53 ` Eric Dumazet
2019-11-19 20:24 ` Oliver Hartkopp
2019-11-19 21:09 ` Eric Dumazet
2019-11-20 20:10 ` Oliver Hartkopp
2019-12-03 10:09 ` Marc Kleine-Budde
2019-12-03 10:37 ` Oliver Hartkopp
2019-12-03 10:40 ` Marc Kleine-Budde
2019-11-26 9:00 ` syzbot
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