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: 13841 Comm: syz-executor0 Not tainted 4.16.0-rc6+ #270
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rdma_protocol_roce include/rdma/ib_verbs.h:2546 [inline]
RIP: 0010:rdma_join_multicast+0x46d/0x3bb0 drivers/infiniband/core/cma.c:4194
RSP: 0018:ffff8801cc5574a0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8801b27a4100 RCX: 0000000000000029
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000148
RBP: ffff8801cc5577a0 R08: ffff8801cc8ea230 R09: 1ffff100398aae72
R10: ffff8801cc557358 R11: 0000000000000001 R12: ffff8801cc8ea000
R13: ffff8801b27a41ad R14: 0000000000000000 R15: ffff8801cc8ea200
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7743b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000009bc21000 CR3: 00000001b7676006 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 ucma_process_join+0x4da/0xa90 drivers/infiniband/core/ucma.c:1375
 ucma_join_ip_multicast+0x274/0x3b0 drivers/infiniband/core/ucma.c:1423
 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1633
 __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_32_irqs_on arch/x86/entry/common.c:330 [inline]
 do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f47c99
RSP: 002b:00000000f774309c EFLAGS: 00000286 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000020000040
RDX: 0000000000000038 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 00 48 c1 ea 03 80 3c 02 00 0f 85 d7 34 00 00 49 8b 04 24 48 ba 00 00 00 00 00 fc ff df 48 8d b8 48 01 00 00 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 f5 35 00 00 49 c1 e6 04 4c 03 b0 48 01 00 00 
RIP: rdma_protocol_roce include/rdma/ib_verbs.h:2546 [inline] RSP: ffff8801cc5574a0
RIP: rdma_join_multicast+0x46d/0x3bb0 drivers/infiniband/core/cma.c:4194 RSP: ffff8801cc5574a0
---[ end trace 53f9ceb772051869 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..