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: 4541 Comm: syz-executor2 Not tainted 4.15.0-rc2+ #214
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:ffff8801c701f320 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 1ffff10038e03e65 RCX: ffffffff8195002d
RDX: 00000000000007d0 RSI: ffffc90001f1f000 RDI: 0000000000000000
RBP: ffff8801c701f470 R08: ffffed0038d1d8e4 R09: ffff8801c68ec700
R10: ffff8801cad89118 R11: ffffed0038d1d8e3 R12: 0000000000000000
R13: ffff8801c701f448 R14: dffffc0000000000 R15: 0000000000000020
FS:  00007f77262ba700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002084d038 CR3: 00000001ca484000 CR4: 00000000001406f0
DR0: 0000000020000008 DR1: 0000000020000008 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
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:636 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:646
 ___sys_sendmsg+0x75b/0x8a0 net/socket.c:2026
 __sys_sendmsg+0xe5/0x210 net/socket.c:2060
 SYSC_sendmsg net/socket.c:2071 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2067
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f77262b9c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452a39
RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000016
RBP: 0000000000000020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee3a0
R13: 00000000ffffffff R14: 00007f77262ba6d4 R15: 000000000000000d
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 e3 37 db ff 4c 89 f8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 41 04 00 00 4d 8d b5 00 ff ff ff 48 ba 00 
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8801c701f320
RIP: compound_head include/linux/page-flags.h:147 [inline] RSP: ffff8801c701f320
RIP: page_mapping+0xa4/0x530 mm/util.c:475 RSP: ffff8801c701f320
---[ end trace 1833e46470977c86 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..