Date:   Tue, 06 Mar 2018 22:59:04 -0800
From:   syzbot <syzbot+160331a9533b151c8651@...kaller.appspotmail.com>
To:     dasaratharaman.chandramouli@...el.com, dledford@...hat.com,
        jgg@...pe.ca, leonro@...lanox.com, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, markb@...lanox.com, monis@...lanox.com,
        parav@...lanox.com, syzkaller-bugs@...glegroups.com
Subject: general protection fault in rdma_disconnect

Hello,

syzbot hit the following crash on upstream commit
ce380619fab99036f5e745c7a865b21c59f005f6 (Tue Mar 6 04:31:14 2018 +0000)
Merge tag 'please-pull-ia64_misc' of  
git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux

So far this crash happened 3 times on upstream.
C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+160331a9533b151c8651@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for  
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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: 0 PID: 4294 Comm: syzkaller511238 Not tainted 4.16.0-rc4+ #343
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:rdma_disconnect+0x2d/0x200 drivers/infiniband/core/cma.c:3878
RSP: 0018:ffff8801cee7fa10 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff10039dcff49 RCX: ffffffff841bc3fc
RDX: 0000000000000078 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8801cee7fa38 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff88613380 R11: 0000000000000000 R12: ffff8801af83a000
R13: 00000000000003c0 R14: 0000000000000000 R15: 00000000200001c8
FS:  00007f20217de700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f202179be78 CR3: 00000001dad71002 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  ucma_disconnect+0xdf/0x150 drivers/infiniband/core/ucma.c:1131
  ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1627
  __vfs_write+0xef/0x970 fs/read_write.c:480
  vfs_write+0x189/0x510 fs/read_write.c:544
  SYSC_write fs/read_write.c:589 [inline]
  SyS_write+0xef/0x220 fs/read_write.c:581
  do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4497c9
RSP: 002b:00007f20217ddda8 EFLAGS: 00000297 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000006dac5c RCX: 00000000004497c9
RDX: 000000000000000c RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 00000000006dac58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000297 R12: 006d635f616d6472
R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 0000000000000006
Code: 89 e5 41 57 41 56 49 89 fe 41 55 41 54 4d 8d ae c0 03 00 00 53 e8 34  
42 55 fd 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00  
0f 85 b8 01 00 00 4d 8b a6 c0 03 00 00 4d 85 e4 0f
RIP: rdma_disconnect+0x2d/0x200 drivers/infiniband/core/cma.c:3878 RSP:  
ffff8801cee7fa10
---[ end trace 4f57ea5e283fed6e ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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View attachment "raw.log.txt" of type "text/plain" (7465 bytes)

View attachment "repro.syz.txt" of type "text/plain" (700 bytes)

View attachment "repro.c.txt" of type "text/plain" (4214 bytes)

View attachment "config.txt" of type "text/plain" (137392 bytes)

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