REISERFS (device loop2): Using r5 hash to sort names
gfs2: not a GFS2 filesystem
REISERFS (device loop2): using 3.5.x disk format
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 8f759067 P4D 8f759067 PUD a5477067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 16114 Comm: syz-executor.2 Not tainted 4.14.198-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a164e040 task.stack: ffff8880518f8000
RIP: 0010:          (null)
RSP: 0018:ffff8880518ffa30 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff86b6a680 RCX: ffffc90008b18000
RDX: 0000000000000000 RSI: ffff8880824f6760 RDI: ffff88803352a4e8
RBP: ffff88803352a4e8 R08: 0000000000000001 R09: 0000000000000002
R10: 0000000000000000 R11: ffff8880a164e040 R12: ffff8880824f6760
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000076
FS:  00007f1722b46700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000907f3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lookup_real fs/namei.c:1555 [inline]
 __lookup_hash fs/namei.c:1575 [inline]
 __lookup_hash+0x1bb/0x270 fs/namei.c:1563
 lookup_one_len+0x279/0x3a0 fs/namei.c:2539
 reiserfs_lookup_privroot+0x92/0x270 fs/reiserfs/xattr.c:963
 reiserfs_fill_super+0x1ad8/0x28b6 fs/reiserfs/super.c:2179
 mount_bdev+0x2b3/0x360 fs/super.c:1134
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4608da
RSP: 002b:00007f1722b45a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1722b45b20 RCX: 00000000004608da
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f1722b45ae0
RBP: 00007f1722b45ae0 R08: 00007f1722b45b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020011100
Code:  Bad RIP value.
RIP:           (null) RSP: ffff8880518ffa30
CR2: 0000000000000000
---[ end trace a2cd034d6bd153c9 ]---