kasan: GPF could be caused by NULL-ptr deref or user memory access
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
general protection fault: 0000 [#1] SMP KASAN
RIP: 0033:0x454879
Dumping ftrace buffer:
RSP: 002b:00007f1c48d9dc68 EFLAGS: 00000246
   (ftrace buffer empty)
 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f1c48d9e6d4 RCX: 0000000000454879
Modules linked in:
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000015
RBP: 000000000072bea0 R08: 0000000000000004 R09: 0000000000000000
CPU: 0 PID: 21877 Comm: syz-executor1 Not tainted 4.16.0-rc6+ #366
R10: 0000000020001fde R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000052c R14: 00000000006f8cc0 R15: 0000000000000000
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Mem-Info:
RIP: 0010:rdma_cap_ib_cm include/rdma/ib_verbs.h:2661 [inline]
RIP: 0010:rdma_init_qp_attr+0x8b/0x720 drivers/infiniband/core/cma.c:1025
RSP: 0018:ffff8801933ff840 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801b2155b40 RCX: ffffffff841bc03f
active_anon:70404 inactive_anon:62 isolated_anon:0
 active_file:3622 inactive_file:8113 isolated_file:0
 unevictable:0 dirty:81 writeback:0 unstable:0
 slab_reclaimable:11482 slab_unreclaimable:185825
 mapped:24295 shmem:71 pagetables:699 bounce:0
 free:1308731 free_pcp:327 free_cma:0
RDX: 0000000000000029 RSI: ffffc900029c5000 RDI: 0000000000000148
RBP: ffff8801933ff880 R08: ffffed003267ff4e R09: ffff8801933ff9cc
R10: 0000000000000000 R11: ffffed003267ff4d R12: ffff8801933ff9c8
R13: ffff8801933ff908 R14: 0000000000000000 R15: ffff8801933ff8c8
FS:  00007f8b74813700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
Node 0 active_anon:281616kB inactive_anon:248kB active_file:14488kB inactive_file:32452kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:97180kB dirty:324kB writeback:0kB shmem:284kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 45056kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b9bc21000 CR3: 0000000192e77002 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Node 0 
Call Trace:
 ucma_init_qp_attr+0x251/0x440 drivers/infiniband/core/ucma.c:1172
DMA free:15908kB min:164kB low:204kB high:244kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
lowmem_reserve[]:
 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1649
 0
 2864
 __vfs_write+0xef/0x970 fs/read_write.c:480
 6373
 6373
 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
Node 0 
DMA32 free:2934564kB min:30292kB low:37864kB high:45436kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129292kB managed:2935312kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:748kB local_pcp:676kB free_cma:0kB
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
lowmem_reserve[]:
 0
 0
 3509
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454879
 3509
RSP: 002b:00007f8b74812c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8b748136d4 RCX: 0000000000454879
RDX: 0000000000000018 RSI: 0000000020000cc0 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000683 R14: 00000000006face8 R15: 0000000000000000
Code: 
Node 0 
00 00 00 fc ff df 
Normal free:2284452kB min:37120kB low:46400kB high:55680kB active_anon:281616kB inactive_anon:248kB active_file:14488kB inactive_file:32452kB unevictable:0kB writepending:324kB present:4718592kB managed:3593744kB mlocked:0kB kernel_stack:5984kB pagetables:2796kB bounce:0kB free_pcp:560kB local_pcp:276kB free_cma:0kB
80 3c 02 00 0f 85 8c 
lowmem_reserve[]:
06 00 00 4c 8b 33 48 
 0
b8 00 00 00 00 00 fc 
 0
ff df 49 8d be 48 01 
 0
00 00 48 89 fa 48 c1 ea 
 0
03 <80> 3c 02 00 0f 85 
5d 06 00 00 44 0f b6 7d 
Node 0 
d4 48 b8 00 00 00 00 
DMA: 
RIP: rdma_cap_ib_cm include/rdma/ib_verbs.h:2661 [inline] RSP: ffff8801933ff840
RIP: rdma_init_qp_attr+0x8b/0x720 drivers/infiniband/core/cma.c:1025 RSP: ffff8801933ff840
---[ end trace 1ec7cbce9dac73be ]---
1*4kB