netdev - Re: general protection fault in smc

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Date:   Fri, 20 Apr 2018 20:49:01 -0700
From:   syzbot <syzbot+9045fc589fcd196ef522@...kaller.appspotmail.com>
To:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, ubraun@...ux.ibm.com,
        ubraun@...ux.vnet.ibm.com
Subject: Re: general protection fault in smc_setsockopt

syzbot has found reproducer for the following crash on upstream commit
83beed7b2b26f232d782127792dd0cd4362fdc41 (Fri Apr 20 17:56:32 2018 +0000)
Merge branch 'fixes' of  
git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal
syzbot dashboard link:  
https://syzkaller.appspot.com/bug?extid=9045fc589fcd196ef522

So far this crash happened 124 times on net-next, upstream.
C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6522155797839872
syzkaller reproducer:  
https://syzkaller.appspot.com/x/repro.syz?id=5566093930266624
Raw console output:  
https://syzkaller.appspot.com/x/log.txt?id=6661555940753408
Kernel config:  
https://syzkaller.appspot.com/x/.config?id=1808800213120130118
compiler: gcc (GCC) 8.0.1 20180413 (experimental)

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9045fc589fcd196ef522@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed.

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
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4520 Comm: syzkaller696326 Not tainted 4.17.0-rc1+ #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:smc_setsockopt+0x8b/0x120 net/smc/af_smc.c:1287
RSP: 0018:ffff8801b433fcc8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000020000000
RDX: 0000000000000005 RSI: ffffffff873e3bf6 RDI: 0000000000000028
RBP: ffff8801b433fcf8 R08: 0000000000000000 R09: ffffed00359a3780
R10: ffffed00359a3780 R11: ffff8801acd1bc03 R12: ffff8801b433fd40
R13: 0000000000000021 R14: 000000000000000d R15: 0000000020000000
FS:  0000000000b01880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562e1fa410d0 CR3: 00000001acf1e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  __sys_setsockopt+0x1bd/0x390 net/socket.c:1903
  __do_sys_setsockopt net/socket.c:1914 [inline]
  __se_sys_setsockopt net/socket.c:1911 [inline]
  __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911
  do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x43fd19
RSP: 002b:00007ffccc4960f8 EFLAGS: 00000217 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd19
RDX: 000000000000000d RSI: 0000000000000021 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000020000000 R11: 0000000000000217 R12: 0000000000401640
R13: 00000000004016d0 R14: 0000000000000000 R15: 0000000000000000
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 93 00 00 00 48 8b 9b 50 04 00 00 48  
b8 00 00 00 00 00 fc ff df 48 8d 7b 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00  
75 62 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 28 49
RIP: smc_setsockopt+0x8b/0x120 net/smc/af_smc.c:1287 RSP: ffff8801b433fcc8
---[ end trace 3858d0cd9ce5e4d4 ]---