Date:   Wed, 07 Mar 2018 07:59:01 -0800
From:   syzbot <syzbot+0df1ab766f8924b1edba@...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_init_qp_attr

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 206 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+0df1ab766f8924b1edba@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for  
details.
If you forward the report, please keep this part and the footer.

audit: type=1400 audit(1520363206.196:6): avc:  denied  { map } for   
pid=4098 comm="bash" path="/bin/bash" dev="sda1" ino=1457  
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023  
tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1520363212.562:7): avc:  denied  { map } for   
pid=4112 comm="syzkaller028148" path="/root/syzkaller028148556" dev="sda1"  
ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023  
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
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: 4112 Comm: syzkaller028148 Not tainted 4.16.0-rc4+ #343
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:rdma_cap_ib_cm include/rdma/ib_verbs.h:2665 [inline]
RIP: 0010:rdma_init_qp_attr+0x8b/0x720 drivers/infiniband/core/cma.c:1025
RSP: 0018:ffff8801c4aaf840 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801c84b5240 RCX: ffffffff841b86df
RDX: 0000000000000029 RSI: ffff8801c4aaf9c8 RDI: 0000000000000148
RBP: ffff8801c4aaf880 R08: ffffed0038955f4e R09: ffff8801c4aaf9cc
R10: 0000000000000000 R11: ffffed0038955f4d R12: ffff8801c4aaf9c8
R13: ffff8801c4aaf908 R14: 0000000000000000 R15: ffff8801c4aaf908
FS:  0000000001639880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005563b7831110 CR3: 00000001c4b6c005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  ucma_init_qp_attr+0x20b/0x3e0 drivers/infiniband/core/ucma.c:1159
  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: 0033:0x43fdc9
RSP: 002b:00007ffe18cbd8a8 EFLAGS: 00000217 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdc9
RDX: 0000000000000018 RSI: 0000000020000240 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004016f0
R13: 0000000000401780 R14: 0000000000000000 R15: 0000000000000000
Code: 00 00 00 fc ff df 80 3c 02 00 0f 85 8c 06 00 00 4c 8b 33 48 b8 00 00  
00 00 00 fc ff df 49 8d be 48 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00  
0f 85 5d 06 00 00 44 0f b6 7d d4 48 b8 00 00 00 00
RIP: rdma_cap_ib_cm include/rdma/ib_verbs.h:2665 [inline] RSP:  
ffff8801c4aaf840
RIP: rdma_init_qp_attr+0x8b/0x720 drivers/infiniband/core/cma.c:1025 RSP:  
ffff8801c4aaf840
---[ end trace d5b388d0574e85e0 ]---
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" (5675 bytes)

View attachment "repro.syz.txt" of type "text/plain" (601 bytes)

View attachment "repro.c.txt" of type "text/plain" (1269 bytes)

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

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