audit: type=1804 audit(1613458127.738:14): pid=10348 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.1" name="/root/syzkaller-testdir829954009/syzkaller.sPNVzs/14/bus" dev="sda1" ino=15805 res=1
REISERFS (device loop4): Using rupasov hash to sort names
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 961bf067 P4D 961bf067 PUD abc9f067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10293 Comm: syz-executor.4 Not tainted 4.19.172-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:ffff88804a4d78a8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 1ffff1100949af18 RCX: ffffc9000e3a5000
RDX: 0000000000000000 RSI: ffff8880997e8dc0 RDI: ffff888040204740
RBP: ffffffff8878d300 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880997e8dc0
R13: ffff888040204740 R14: ffff88804a4d7a38 R15: ffff88804a4d78e0
FS:  00007fd3a2aa4700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000989db000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __lookup_slow+0x246/0x4a0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:1672
 lookup_one_len+0x163/0x190 syzkaller/managers/linux-4-19/kernel/fs/namei.c:2544
 reiserfs_lookup_privroot+0x92/0x280 syzkaller/managers/linux-4-19/kernel/fs/reiserfs/xattr.c:970
 reiserfs_fill_super+0x202c/0x2cf0 syzkaller/managers/linux-4-19/kernel/fs/reiserfs/super.c:2179
 mount_bdev+0x2fc/0x3b0 syzkaller/managers/linux-4-19/kernel/fs/super.c:1158
 mount_fs+0xa3/0x310 syzkaller/managers/linux-4-19/kernel/fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:961
 vfs_kern_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:951 [inline]
 do_new_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2469 [inline]
 do_mount+0x113c/0x2f10 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2799
 ksys_mount+0xcf/0x130 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3015
 __do_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3029 [inline]
 __se_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026
 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4672ba
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd3a2aa3fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00000000004672ba
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fd3a2aa4000
RBP: 00007fd3a2aa4040 R08: 00007fd3a2aa4040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007fd3a2aa4000 R15: 0000000020011200
Modules linked in:
CR2: 0000000000000000
---[ end trace c24729beabf9d5b5 ]---
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff88804a4d78a8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 1ffff1100949af18 RCX: ffffc9000e3a5000
RDX: 0000000000000000 RSI: ffff8880997e8dc0 RDI: ffff888040204740
RBP: ffffffff8878d300 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880997e8dc0
R13: ffff888040204740 R14: ffff88804a4d7a38 R15: ffff88804a4d78e0
FS:  00007fd3a2aa4700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdf239ac710 CR3: 00000000989db000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400