general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 PID: 1487 Comm: syz-executor.1 Tainted: G        W          6.0.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
RIP: 0010:ext4_acquire_dquot+0x1f2/0x400 fs/ext4/super.c:6608
Code: 48 c1 e8 03 80 3c 10 00 74 12 48 89 df e8 16 d2 c3 ff 48 ba 00 00 00 00 00 fc ff df 4c 8b 33 49 83 c6 28 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 f0 d1 c3 ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90002dc7500 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff88810e745158 RCX: ffffffff81bc560d
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff8881221d8c80
RBP: ffffc90002dc7548 R08: dffffc0000000000 R09: ffffed102443b1a1
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1102443b19e
R13: 0000000000000049 R14: 0000000000000028 R15: ffff888111b56068
FS:  00007f1d5ebd7700(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa480f32000 CR3: 0000000117c85000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dqget+0x7b5/0xc60 fs/quota/dquot.c:914
 __dquot_initialize+0x38e/0xd90 fs/quota/dquot.c:1492
 dquot_initialize fs/quota/dquot.c:1550 [inline]
 dquot_file_open+0x47/0x70 fs/quota/dquot.c:2181
 ext4_file_open+0x227/0x5d0 fs/ext4/file.c:872
 do_dentry_open+0x5b2/0xdd0 fs/open.c:878
 vfs_open+0x6e/0x80 fs/open.c:1014
 do_open fs/namei.c:3557 [inline]
 path_openat+0x1eb2/0x2450 fs/namei.c:3691
 do_filp_open+0x226/0x430 fs/namei.c:3718
 do_sys_openat2+0x10b/0x420 fs/open.c:1311
 do_sys_open fs/open.c:1327 [inline]
 __do_sys_openat fs/open.c:1343 [inline]
 __se_sys_openat fs/open.c:1338 [inline]
 __x64_sys_openat+0x209/0x250 fs/open.c:1338
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1d5de8c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1d5ebd7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f1d5dfabf80 RCX: 00007f1d5de8c169
RDX: 000000000000275a RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f1d5dee7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd6f683bbf R14: 00007f1d5ebd7300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_acquire_dquot+0x1f2/0x400 fs/ext4/super.c:6608
Code: 48 c1 e8 03 80 3c 10 00 74 12 48 89 df e8 16 d2 c3 ff 48 ba 00 00 00 00 00 fc ff df 4c 8b 33 49 83 c6 28 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 f0 d1 c3 ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90002dc7500 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff88810e745158 RCX: ffffffff81bc560d
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff8881221d8c80
RBP: ffffc90002dc7548 R08: dffffc0000000000 R09: ffffed102443b1a1
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1102443b19e
R13: 0000000000000049 R14: 0000000000000028 R15: ffff888111b56068
FS:  00007f1d5ebd7700(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7988545718 CR3: 0000000117c85000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 c1 e8 03          	shr    $0x3,%rax
   4:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1)
   8:	74 12                	je     0x1c
   a:	48 89 df             	mov    %rbx,%rdi
   d:	e8 16 d2 c3 ff       	callq  0xffc3d228
  12:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  19:	fc ff df
  1c:	4c 8b 33             	mov    (%rbx),%r14
  1f:	49 83 c6 28          	add    $0x28,%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1) <-- trapping instruction
  2e:	74 12                	je     0x42
  30:	4c 89 f7             	mov    %r14,%rdi
  33:	e8 f0 d1 c3 ff       	callq  0xffc3d228
  38:	48                   	rex.W
  39:	ba 00 00 00 00       	mov    $0x0,%edx
  3e:	00 fc                	add    %bh,%ah