BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
PGD 8000000088ba4067 P4D 8000000088ba4067 PUD 871cb067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 1 PID: 10920 Comm: syz-executor5 Not tainted 4.18.0-rc4+ #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:197 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:142 [inline]
RIP: 0010:PageLocked include/linux/page-flags.h:272 [inline]
RIP: 0010:grow_dev_page fs/buffer.c:942 [inline]
RIP: 0010:grow_buffers fs/buffer.c:1009 [inline]
RIP: 0010:__getblk_slow fs/buffer.c:1036 [inline]
RIP: 0010:__getblk_gfp+0x5cf/0x1650 fs/buffer.c:1316
Code: ff ff 44 89 e9 e8 41 88 ab ff 49 89 c6 4c 8b ab 20 03 00 00 8b 83 a8 0f 00 00 89 45 c8 49 8d 5e 08 4d 85 ed 0f 85 3e 01 00 00 <4d> 8b 7e 08 48 89 9d e0 fe ff ff 48 89 df e8 8e 17 db ff 48 8b 08 
RSP: 0018:ffff880085f9fab8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000036d2f RDI: 0000000000036d30
RBP: ffff880085f9fc00 R08: 0000000000480000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8675b2c0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801d3c288d0
FS:  00007f6762753700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f00de6ac4a0 CR3: 000000008c8a4000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __bread_gfp+0x128/0x870 fs/buffer.c:1352
 sb_bread include/linux/buffer_head.h:307 [inline]
 ext4_xattr_block_list fs/ext4/xattr.c:702 [inline]
 ext4_listxattr+0xcce/0x13c0 fs/ext4/xattr.c:774
 vfs_listxattr fs/xattr.c:356 [inline]
 listxattr+0x4c6/0x7c0 fs/xattr.c:618
 __do_sys_flistxattr fs/xattr.c:671 [inline]
 __se_sys_flistxattr fs/xattr.c:663 [inline]
 __x64_sys_flistxattr+0x270/0x350 fs/xattr.c:663
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
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:00007f6762752c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000c4
RAX: ffffffffffffffda RBX: 00007f67627536d4 RCX: 0000000000455ab9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015
R13: 00000000004bbc0a R14: 00000000004c9400 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000008
---[ end trace 8adae750b5488946 ]---
RIP: 0010:__read_once_size include/linux/compiler.h:197 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:142 [inline]
RIP: 0010:PageLocked include/linux/page-flags.h:272 [inline]
RIP: 0010:grow_dev_page fs/buffer.c:942 [inline]
RIP: 0010:grow_buffers fs/buffer.c:1009 [inline]
RIP: 0010:__getblk_slow fs/buffer.c:1036 [inline]
RIP: 0010:__getblk_gfp+0x5cf/0x1650 fs/buffer.c:1316
Code: ff ff 44 89 e9 e8 41 88 ab ff 49 89 c6 4c 8b ab 20 03 00 00 8b 83 a8 0f 00 00 89 45 c8 49 8d 5e 08 4d 85 ed 0f 85 3e 01 00 00 <4d> 8b 7e 08 48 89 9d e0 fe ff ff 48 89 df e8 8e 17 db ff 48 8b 08 
RSP: 0018:ffff880085f9fab8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000036d2f RDI: 0000000000036d30
RBP: ffff880085f9fc00 R08: 0000000000480000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8675b2c0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801d3c288d0
FS:  00007f6762753700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f00de6ac4a0 CR3: 000000008c8a4000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600