From: syzbot <syzbot+b0f5178b61ed7f3bbb46@syzkaller.appspotmail.com>
To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
daniel@iogearbox.net, davem@davemloft.net, dsahern@kernel.org,
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,
syzkaller-bugs@googlegroups.com, yhs@fb.com,
yoshfuji@linux-ipv6.org
Subject: possible deadlock in inet_stream_connect
Date: Wed, 17 Feb 2021 09:30:23 -0800 [thread overview]
Message-ID: <000000000000e6f01f05bb8b9268@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 9ec5eea5 lib/parman: Delete newline
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11380d24d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=dbc1ca9e55dc1f9f
dashboard link: https://syzkaller.appspot.com/bug?extid=b0f5178b61ed7f3bbb46
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=177a6d14d00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10caeb02d00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b0f5178b61ed7f3bbb46@syzkaller.appspotmail.com
============================================
WARNING: possible recursive locking detected
5.11.0-rc7-syzkaller #0 Not tainted
--------------------------------------------
syz-executor845/10119 is trying to acquire lock:
ffff888021e6e320 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1598 [inline]
ffff888021e6e320 (sk_lock-AF_INET6){+.+.}-{0:0}, at: inet_stream_connect+0x3f/0xa0 net/ipv4/af_inet.c:724
but task is already holding lock:
ffff888022c1a520 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1598 [inline]
ffff888022c1a520 (sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp_stream_connect+0x85/0x800 net/mptcp/protocol.c:3171
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(sk_lock-AF_INET6);
lock(sk_lock-AF_INET6);
*** DEADLOCK ***
May be due to missing lock nesting notation
1 lock held by syz-executor845/10119:
#0: ffff888022c1a520 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1598 [inline]
#0: ffff888022c1a520 (sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp_stream_connect+0x85/0x800 net/mptcp/protocol.c:3171
stack backtrace:
CPU: 0 PID: 10119 Comm: syz-executor845 Not tainted 5.11.0-rc7-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+0x107/0x163 lib/dump_stack.c:120
print_deadlock_bug kernel/locking/lockdep.c:2761 [inline]
check_deadlock kernel/locking/lockdep.c:2804 [inline]
validate_chain kernel/locking/lockdep.c:3595 [inline]
__lock_acquire.cold+0x114/0x39e kernel/locking/lockdep.c:4832
lock_acquire kernel/locking/lockdep.c:5442 [inline]
lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407
lock_sock_nested+0xc5/0x110 net/core/sock.c:3071
lock_sock include/net/sock.h:1598 [inline]
inet_stream_connect+0x3f/0xa0 net/ipv4/af_inet.c:724
mptcp_stream_connect+0x156/0x800 net/mptcp/protocol.c:3200
__sys_connect_file+0x155/0x1a0 net/socket.c:1835
__sys_connect+0x161/0x190 net/socket.c:1852
__do_sys_connect net/socket.c:1862 [inline]
__se_sys_connect net/socket.c:1859 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1859
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x443ce9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 15 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff5f9324e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443ce9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000a800000000 R09: 000000a800000000
R10: 000000a800000000 R11: 0000000000000246 R12: 00007fff5f932500
R13: 00007fff5f932510 R14: 0000000000014e11 R15: 00007fff5f9324f0
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
next reply other threads:[~2021-02-17 17:31 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-17 17:30 syzbot [this message]
2021-02-18 18:02 ` possible deadlock in inet_stream_connect syzbot
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