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: 17239 Comm: syz-executor2 Not tainted 4.15.0-rc5+ #240
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:147 [inline]
RIP: 0010:page_mapping+0xa4/0x530 mm/util.c:475
RSP: 0018:ffff8801d8ea71f0 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 1ffff1003b1d4e3f RCX: ffffffff8194b06d
RDX: 0000000000000438 RSI: ffffc90002dc0000 RDI: 0000000000000000
RBP: ffff8801d8ea7340 R08: ffffed0039533452 R09: ffff8801ca99a270
R10: ffff8801d894de98 R11: ffffed0039533451 R12: 0000000000000000
R13: ffff8801d8ea7318 R14: dffffc0000000000 R15: 0000000000000020
FS:  00007f627bc84700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020825ff0 CR3: 00000001bdfb3004 CR4: 00000000001606e0
Call Trace:
 set_page_dirty+0xb9/0x5d0 mm/page-writeback.c:2544
 rds_atomic_free_op+0xc2/0x330 net/rds/rdma.c:481
 rds_message_purge net/rds/message.c:79 [inline]
 rds_message_put+0x53c/0x6b0 net/rds/message.c:91
 rds_sendmsg+0x14fa/0x1f90 net/rds/send.c:1207
 sock_sendmsg_nosec net/socket.c:636 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:646
 ___sys_sendmsg+0x320/0x8b0 net/socket.c:2026
 __sys_sendmmsg+0x1ee/0x620 net/socket.c:2116
 SYSC_sendmmsg net/socket.c:2147 [inline]
 SyS_sendmmsg+0x35/0x60 net/socket.c:2142
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007f627bc83c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000000000001 RSI: 0000000020573000 RDI: 0000000000000014
RBP: 0000000000000020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ed3a0
R13: 00000000ffffffff R14: 00007f627bc846d4 R15: 0000000000000000
Code: f2 f2 f2 c7 40 14 00 f2 f2 f2 c7 40 18 f2 f2 f2 f2 c7 40 1c 00 f2 f2 f2 c7 40 20 f3 f3 f3 f3 e8 43 3b db ff 4c 89 f8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 3c 04 00 00 4d 8d b5 00 ff ff ff 48 ba 00 
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8801d8ea71f0
RIP: compound_head include/linux/page-flags.h:147 [inline] RSP: ffff8801d8ea71f0
RIP: page_mapping+0xa4/0x530 mm/util.c:475 RSP: ffff8801d8ea71f0
---[ end trace 939e665ee15d4183 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..