reiserfs: using flush barriers
REISERFS (device loop0): journal params: device loop0, size 8192, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using rupasov hash to sort names
REISERFS (device loop0): using 3.5.x disk format
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD a81b8067 P4D a81b8067 PUD 90da9067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 6359 Comm: syz-executor357 Not tainted 4.14.198-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880971d44c0 task.stack: ffff888095470000
RIP: 0010:          (null)
RSP: 0018:ffff888095477a30 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff86b6a680 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff888083a95340 RDI: ffff888082bfc748
RBP: ffff888082bfc748 R08: 0000000000000001 R09: 0000000000000002
R10: 0000000000000000 R11: ffff8880971d44c0 R12: ffff888083a95340
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000076
FS:  0000000001f0f880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000008b811000 CR4: 00000000001406e0
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: 0033:0x44707a
RSP: 002b:00007ffff47a6398 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffff47a63f0 RCX: 000000000044707a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffff47a63b0
RBP: 00007ffff47a63b0 R08: 00007ffff47a63f0 R09: 00007fff00000015
R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000006
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
Code:  Bad RIP value.
RIP:           (null) RSP: ffff888095477a30
CR2: 0000000000000000
---[ end trace b7a965fcdd634e5d ]---