BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 PGD 8000000129fac067 P4D 8000000129fac067 PUD 123ef0067 PMD 0 Oops: 0000 [#1] SMP PTI CPU: 1 PID: 9488 Comm: syz-executor1 Not tainted 4.18.0-rc8+ #34 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+0x59f/0x15d0 fs/buffer.c:1316 Code: 89 e9 e8 b4 14 ae ff 49 89 c7 4c 8b ab 20 03 00 00 8b 83 a8 0f 00 00 89 45 d0 49 8d 47 08 4d 85 ed 0f 85 83 06 00 00 4d 89 fe <4d> 8b 7f 08 48 89 85 00 ff ff ff 48 89 c7 e8 ce 3a dc ff 48 8b 08 RSP: 0018:ffff88019800f7c0 EFLAGS: 00010246 RAX: 0000000000000008 RBX: ffff8801ab2943f8 RCX: 0000000000040000 RDX: ffffc90001ab4000 RSI: 000000000003ab99 RDI: 000000000003ab9a RBP: ffff88019800f8f8 R08: 0000000000480000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff85031d70 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f8e8a650700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5a50906000 CR3: 0000000129f08000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __bread_gfp+0xf6/0x820 fs/buffer.c:1352 sb_bread include/linux/buffer_head.h:307 [inline] ext4_xattr_block_get fs/ext4/xattr.c:528 [inline] ext4_xattr_get+0x43f/0x1010 fs/ext4/xattr.c:651 ext4_xattr_user_get+0x179/0x1a0 fs/ext4/xattr_user.c:28 __vfs_getxattr+0x7a6/0x7f0 fs/xattr.c:311 vfs_getxattr+0x55c/0x5b0 fs/xattr.c:342 getxattr+0x2ed/0x710 fs/xattr.c:538 __do_sys_fgetxattr fs/xattr.c:596 [inline] __se_sys_fgetxattr fs/xattr.c:587 [inline] __x64_sys_fgetxattr+0x2bb/0x390 fs/xattr.c:587 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457089 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8e8a64fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c1 RAX: ffffffffffffffda RBX: 00007f8e8a6506d4 RCX: 0000000000457089 RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00000000004cbaf0 R14: 00000000004c3428 R15: 0000000000000000 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) CR2: 0000000000000008 ---[ end trace 46673d20f29a8eb3 ]--- 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+0x59f/0x15d0 fs/buffer.c:1316 Code: 89 e9 e8 b4 14 ae ff 49 89 c7 4c 8b ab 20 03 00 00 8b 83 a8 0f 00 00 89 45 d0 49 8d 47 08 4d 85 ed 0f 85 83 06 00 00 4d 89 fe <4d> 8b 7f 08 48 89 85 00 ff ff ff 48 89 c7 e8 ce 3a dc ff 48 8b 08 RSP: 0018:ffff88019800f7c0 EFLAGS: 00010246 RAX: 0000000000000008 RBX: ffff8801ab2943f8 RCX: 0000000000040000 RDX: ffffc90001ab4000 RSI: 000000000003ab99 RDI: 000000000003ab9a RBP: ffff88019800f8f8 R08: 0000000000480000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff85031d70 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f8e8a650700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5a50906000 CR3: 0000000129f08000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400