x86/PAT: syz-executor6:7223 map pfn RAM range req write-combining for [mem 0x196d60000-0x196d63fff], got write-back
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 1cf12f067 P4D 1cf12f067 PUD 1d800d067 PMD 0 
Oops: 0010 [#1] SMP KASAN
CPU: 1 PID: 7230 Comm: syz-executor5 Not tainted 4.18.0-rc2+ #121
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff8801d65cf688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801b4b7a640 RCX: ffffc90005821000
RDX: ffff8801d65cf9e0 RSI: ffff8801b4b7a640 RDI: ffff8801d8a4f780
RBP: ffff8801d65cf730 R08: ffff8801d680a6c0 R09: ffff8801d65cf1e0
R10: 0000000000000003 R11: 0000000000000000 R12: ffff8801d65cf9e0
R13: ffff8801d8a4f780 R14: ffffffff8818a920 R15: ffff8801aca40940
FS:  00007faeea8c2700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ad22f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vfs_poll include/linux/poll.h:86 [inline]
 do_pollfd fs/select.c:825 [inline]
 do_poll fs/select.c:873 [inline]
 do_sys_poll+0x74d/0x1180 fs/select.c:967
 __do_sys_ppoll fs/select.c:1075 [inline]
 __se_sys_ppoll fs/select.c:1047 [inline]
 __x64_sys_ppoll+0x2fe/0x610 fs/select.c:1047
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a99
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007faeea8c1c68 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: ffffffffffffffda RBX: 00007faeea8c26d4 RCX: 0000000000455a99
RDX: 0000000020000200 RSI: 0000000000000007 RDI: 0000000020000000
RBP: 000000000072bea0 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000020000240 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c0638 R14: 00000000004cffc0 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000000
---[ end trace 6366c1dbae0c7249 ]---
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff8801d65cf688 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801b4b7a640 RCX: ffffc90005821000
RDX: ffff8801d65cf9e0 RSI: ffff8801b4b7a640 RDI: ffff8801d8a4f780
RBP: ffff8801d65cf730 R08: ffff8801d680a6c0 R09: ffff8801d65cf1e0
R10: 0000000000000003 R11: 0000000000000000 R12: ffff8801d65cf9e0
R13: ffff8801d8a4f780 R14: ffffffff8818a920 R15: ffff8801aca40940
FS:  00007faeea8c2700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ad22f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400