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Thu, 19 Jul 2018 07:49:03 -0700 (PDT) Date: Thu, 19 Jul 2018 07:49:03 -0700 In-Reply-To: <0000000000006e1bbe0570bea62e@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000be957f05715b47e9@google.com> Subject: Re: general protection fault in inet_accept From: syzbot To: davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 024ddc0ce104 Merge git://git.kernel.org/pub/scm/linux/kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=103f4b2c400000 kernel config: https://syzkaller.appspot.com/x/.config?x=c0bdc4175608181c dashboard link: https://syzkaller.appspot.com/bug?extid=2e9616288940d15a6476 compiler: gcc (GCC) 8.0.1 20180413 (experimental) userspace arch: i386 syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=15b5e1c2400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+2e9616288940d15a6476@syzkaller.appspotmail.com random: sshd: uninitialized urandom read (32 bytes read) random: cc1: uninitialized urandom read (8 bytes read) IPVS: ftp: loaded support on port[0] = 21 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN CPU: 0 PID: 4573 Comm: kworker/0:4 Not tainted 4.18.0-rc5+ #57 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events smc_tcp_listen_work RIP: 0010:inet_accept+0xf2/0x9f0 net/ipv4/af_inet.c:734 Code: 84 d2 74 09 80 fa 03 0f 8e 93 07 00 00 48 8d 78 28 41 c7 46 80 ea ff ff ff 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 94 07 00 00 48 b9 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffff8801d93974b0 EFLAGS: 00010206 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000005 RDX: dffffc0000000000 RSI: ffffffff867516c6 RDI: 0000000000000028 RBP: ffff8801d9397598 R08: ffff8801adcde0c0 R09: ffffed003517482f R10: ffffed003517482f R11: ffff8801a8ba417b R12: ffff8801a8ba40c0 R13: ffff8801d93974f0 R14: ffff8801d9397570 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000008350031 CR3: 0000000008e6a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kernel_accept+0x136/0x310 net/socket.c:3251 smc_clcsock_accept net/smc/af_smc.c:701 [inline] smc_tcp_listen_work+0x222/0xef0 net/smc/af_smc.c:1114 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace 99066b32c3785fe4 ]--- RIP: 0010:inet_accept+0xf2/0x9f0 net/ipv4/af_inet.c:734 Code: 84 d2 74 09 80 fa 03 0f 8e 93 07 00 00 48 8d 78 28 41 c7 46 80 ea ff ff ff 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 94 07 00 00 48 b9 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffff8801d93974b0 EFLAGS: 00010206 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000005 RDX: dffffc0000000000 RSI: ffffffff867516c6 RDI: 0000000000000028 RBP: ffff8801d9397598 R08: ffff8801adcde0c0 R09: ffffed003517482f R10: ffffed003517482f R11: ffff8801a8ba417b R12: ffff8801a8ba40c0 R13: ffff8801d93974f0 R14: ffff8801d9397570 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000008350031 CR3: 0000000008e6a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400