general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 1 PID: 6053 Comm: syz-executor.1 Not tainted 6.1.35-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:i_size_read include/linux/fs.h:864 [inline]
RIP: 0010:ext4_quota_read+0xba/0x2c0 fs/ext4/super.c:7076
Code: 00 00 00 44 89 e6 e8 65 2d 41 ff 41 83 fc 3f 0f 87 f8 01 00 00 e8 f6 2a 41 ff 48 8b 44 24 10 48 8d 68 50 48 89 e8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 ef e8 d7 73 97 ff 48 8b 6d 00 48 89 ef
RSP: 0018:ffffc90004a77160 EFLAGS: 00010206
RAX: 000000000000000a RBX: ffff888063e1b800 RCX: ffff888013701dc0
RDX: 0000000000000000 RSI: 000000000000000c RDI: 0000000000000040
RBP: 0000000000000050 R08: ffffffff8248ab8b R09: ffff888063e1b800
R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000000000c
R13: 0000000000000400 R14: ffff888021998000 R15: dffffc0000000000
FS:  00007f8f7ff04700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555557196708 CR3: 0000000022bad000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 read_blk fs/quota/quota_tree.c:55 [inline]
 do_insert_tree+0x248/0x1ae0 fs/quota/quota_tree.c:347
 dq_insert_tree fs/quota/quota_tree.c:401 [inline]
 qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:420
 v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358
 dquot_acquire+0x34d/0x680 fs/quota/dquot.c:444
 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6766
 dqget+0x98b/0xdb0 fs/quota/dquot.c:914
 __dquot_initialize+0x2d9/0xe10 fs/quota/dquot.c:1492
 ext4_file_open+0x2cf/0x710 fs/ext4/file.c:893
 do_dentry_open+0x7f9/0x10f0 fs/open.c:882
 do_open fs/namei.c:3557 [inline]
 path_openat+0x2644/0x2e60 fs/namei.c:3714
 do_filp_open+0x230/0x480 fs/namei.c:3741
 do_sys_openat2+0x13b/0x500 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1345
 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: 0033:0x7f8f7f28c389
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:00007f8f7ff04168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f8f7f3abf80 RCX: 00007f8f7f28c389
RDX: 000000000000275a RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f8f7f2d7493 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcab9ff34f R14: 00007f8f7ff04300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:i_size_read include/linux/fs.h:864 [inline]
RIP: 0010:ext4_quota_read+0xba/0x2c0 fs/ext4/super.c:7076
Code: 00 00 00 44 89 e6 e8 65 2d 41 ff 41 83 fc 3f 0f 87 f8 01 00 00 e8 f6 2a 41 ff 48 8b 44 24 10 48 8d 68 50 48 89 e8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 ef e8 d7 73 97 ff 48 8b 6d 00 48 89 ef
RSP: 0018:ffffc90004a77160 EFLAGS: 00010206
RAX: 000000000000000a RBX: ffff888063e1b800 RCX: ffff888013701dc0
RDX: 0000000000000000 RSI: 000000000000000c RDI: 0000000000000040
RBP: 0000000000000050 R08: ffffffff8248ab8b R09: ffff888063e1b800
R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000000000c
R13: 0000000000000400 R14: ffff888021998000 R15: dffffc0000000000
FS:  00007f8f7ff04700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa93f21d000 CR3: 0000000022bad000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 44 89 e6          	add    %al,-0x1a(%rcx,%rcx,4)
   6:	e8 65 2d 41 ff       	callq  0xff412d70
   b:	41 83 fc 3f          	cmp    $0x3f,%r12d
   f:	0f 87 f8 01 00 00    	ja     0x20d
  15:	e8 f6 2a 41 ff       	callq  0xff412b10
  1a:	48 8b 44 24 10       	mov    0x10(%rsp),%rax
  1f:	48 8d 68 50          	lea    0x50(%rax),%rbp
  23:	48 89 e8             	mov    %rbp,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 ef             	mov    %rbp,%rdi
  34:	e8 d7 73 97 ff       	callq  0xff977410
  39:	48 8b 6d 00          	mov    0x0(%rbp),%rbp
  3d:	48 89 ef             	mov    %rbp,%rdi