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: 4177 Comm: syz-executor6 Not tainted 4.15.0-rc4+ #165
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:ffff8801c4487300 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 1ffff10038890e61 RCX: ffffffff81956dad
RDX: 0000000000000224 RSI: ffffc900044be000 RDI: 0000000000000000
RBP: ffff8801c4487450 R08: ffffed00379230de R09: ffff8801bc9186d0
R10: ffff8801cec1aab0 R11: ffffed00379230dd R12: 0000000000000000
R13: ffff8801c4487428 R14: dffffc0000000000 R15: 0000000000000020
FS:  00007fc965a92700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020c20fc8 CR3: 00000001d5be5005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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+0x14ee/0x1f90 net/rds/send.c:1204
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2018
 __sys_sendmsg+0xe5/0x210 net/socket.c:2052
 SYSC_sendmsg net/socket.c:2063 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2059
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007fc965a91c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452ac9
RDX: 0000000000000000 RSI: 0000000020c20fc8 RDI: 0000000000000013
RBP: 0000000000000485 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3d18
R13: 00000000ffffffff R14: 00007fc965a926d4 R15: 0000000000000007
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 a3 82 da 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: ffff8801c4487300
RIP: compound_head include/linux/page-flags.h:147 [inline] RSP: ffff8801c4487300
RIP: page_mapping+0xa4/0x530 mm/util.c:475 RSP: ffff8801c4487300
---[ end trace 827381894f916666 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..