general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 PID: 15447 Comm: syz-executor.0 Not tainted 6.4.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:ext4_acquire_dquot+0x23f/0x400 fs/ext4/super.c:6801
Code: 9c d8 30 02 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 7f 37 96 ff 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 62 37 96 ff bd 78 06 00 00 48 03
RSP: 0018:ffffc9001639f4e0 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: 0000000000040000
RDX: ffffc900047e3000 RSI: 000000000000201e RDI: 000000000000201f
RBP: ffff888030e2bee4 R08: ffffffff824cfd65 R09: ffffed10061c57df
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000049 R14: dffffc0000000000 R15: ffff888030e2bdc0
FS:  00007fa0e6bf5700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fec0d616000 CR3: 000000007ae29000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dqget+0x98f/0xdb0 fs/quota/dquot.c:914
 __dquot_initialize+0x462/0xe20 fs/quota/dquot.c:1492
 ext4_file_open+0x30c/0x750 fs/ext4/file.c:904
 do_dentry_open+0x7f9/0x10f0 fs/open.c:920
 do_open fs/namei.c:3636 [inline]
 path_openat+0x27b3/0x3170 fs/namei.c:3791
 do_filp_open+0x234/0x490 fs/namei.c:3818
 do_sys_openat2+0x13f/0x500 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_open fs/open.c:1380 [inline]
 __se_sys_open fs/open.c:1376 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1376
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa0e5e8c169
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:00007fa0e6bf5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fa0e5fac120 RCX: 00007fa0e5e8c169
RDX: 0000000000000000 RSI: 0000000000060142 RDI: 0000000020000000
RBP: 00007fa0e5ee7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff65377b0f R14: 00007fa0e6bf5300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_acquire_dquot+0x23f/0x400 fs/ext4/super.c:6801
Code: 9c d8 30 02 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 7f 37 96 ff 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 62 37 96 ff bd 78 06 00 00 48 03
RSP: 0018:ffffc9001639f4e0 EFLAGS: 00010206

RAX: 0000000000000005 RBX: 0000000000000028 RCX: 0000000000040000
RDX: ffffc900047e3000 RSI: 000000000000201e RDI: 000000000000201f
RBP: ffff888030e2bee4 R08: ffffffff824cfd65 R09: ffffed10061c57df
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000049 R14: dffffc0000000000 R15: ffff888030e2bdc0
FS:  00007fa0e6bf5700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000207e3000 CR3: 000000007ae29000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	9c                   	pushfq
   1:	d8 30                	fdivs  (%rax)
   3:	02 00                	add    (%rax),%al
   5:	00 48 89             	add    %cl,-0x77(%rax)
   8:	d8 48 c1             	fmuls  -0x3f(%rax)
   b:	e8 03 42 80 3c       	callq  0x3c804213
  10:	30 00                	xor    %al,(%rax)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 7f 37 96 ff       	callq  0xff96379b
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 83 c3 28          	add    $0x28,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 62 37 96 ff       	callq  0xff96379b
  39:	bd 78 06 00 00       	mov    $0x678,%ebp
  3e:	48                   	rex.W
  3f:	03                   	.byte 0x3