BTRFS error (device loop3): open_ctree failed
BTRFS error (device loop4): superblock checksum mismatch
BTRFS error (device loop4): open_ctree failed
REISERFS (device loop2): Using rupasov hash to sort names
REISERFS (device loop2): using 3.5.x disk format
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 63c08067 P4D 63c08067 PUD 87bd3067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 23504 Comm: syz-executor.2 Not tainted 4.19.149-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff8880852678a0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 1ffff11010a4cf17 RCX: ffffc90005f64000
RDX: 0000000000000000 RSI: ffff88808a9a0040 RDI: ffff888043448a80
RBP: ffffffff881a37c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808a9a0040
R13: ffff888043448a80 R14: ffff888085267a30 R15: ffff8880852678d8
FS:  00007f56c7589700(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000960e7000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __lookup_slow+0x246/0x4a0 fs/namei.c:1672
 lookup_one_len+0x163/0x190 fs/namei.c:2544
 reiserfs_lookup_privroot+0x92/0x280 fs/reiserfs/xattr.c:963
 reiserfs_fill_super+0x21e8/0x2e60 fs/reiserfs/super.c:2179
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x318 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x51c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4607ea
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f56c7588a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f56c7588b20 RCX: 00000000004607ea
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f56c7588ae0
RBP: 00007f56c7588ae0 R08: 00007f56c7588b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020011100
Modules linked in:
CR2: 0000000000000000
---[ end trace a4951f5d36bf1513 ]---
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff8880852678a0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 1ffff11010a4cf17 RCX: ffffc90005f64000
RDX: 0000000000000000 RSI: ffff88808a9a0040 RDI: ffff888043448a80
RBP: ffffffff881a37c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808a9a0040
R13: ffff888043448a80 R14: ffff888085267a30 R15: ffff8880852678d8
FS:  00007f56c7589700(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000960e7000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600