general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 4640 Comm: syz.8.1104 Not tainted 5.10.237-syzkaller-00309-g7e2543346ff7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:traverse_mounts fs/namei.c:1357 [inline]
RIP: 0010:handle_mounts fs/namei.c:1477 [inline]
RIP: 0010:step_into+0x122/0xcf0 fs/namei.c:1782
Code: c6 44 24 5f 00 43 0f b6 44 25 00 84 c0 48 8b 54 24 08 0f 85 51 0a 00 00 44 8b 32 4c 8b bc 24 88 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 56 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc900011079a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffc90001107bc0 RCX: 0000000000080000
RDX: ffffc90001107bf8 RSI: 0000000000000263 RDI: 0000000000000264
RBP: ffffc90001107a88 R08: 0000000000000000 R09: ffffed10237efed5
R10: ffffed10237efed5 R11: 1ffff110237efed4 R12: dffffc0000000000
R13: 1ffff92000220f7f R14: 0000000000000009 R15: 0000000000000001
FS:  00007ffa4a9816c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000b000 CR3: 0000000112ee8000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 walk_component+0x26a/0x460 fs/namei.c:1958
 lookup_last fs/namei.c:2403 [inline]
 path_lookupat+0x180/0x490 fs/namei.c:2427
 filename_lookup+0x1d5/0x600 fs/namei.c:2460
 kern_path+0x35/0x40 fs/namei.c:2547
 lookup_bdev+0xb3/0x210 fs/block_dev.c:2111
 quotactl_block fs/quota/quota.c:874 [inline]
 __do_sys_quotactl fs/quota/quota.c:938 [inline]
 __se_sys_quotactl+0x217/0xa90 fs/quota/quota.c:900
 __x64_sys_quotactl+0x9b/0xb0 fs/quota/quota.c:900
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7ffa4c35a969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa4a981038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007ffa4c582160 RCX: 00007ffa4c35a969
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: ffffffff80000202
RBP: 00007ffa4c3dcab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffa4c582160 R15: 00007ffd85c562f8
Modules linked in:
---[ end trace 21b9b69d1db2dcbd ]---
RIP: 0010:traverse_mounts fs/namei.c:1357 [inline]
RIP: 0010:handle_mounts fs/namei.c:1477 [inline]
RIP: 0010:step_into+0x122/0xcf0 fs/namei.c:1782
Code: c6 44 24 5f 00 43 0f b6 44 25 00 84 c0 48 8b 54 24 08 0f 85 51 0a 00 00 44 8b 32 4c 8b bc 24 88 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 56 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc900011079a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffc90001107bc0 RCX: 0000000000080000
RDX: ffffc90001107bf8 RSI: 0000000000000263 RDI: 0000000000000264
RBP: ffffc90001107a88 R08: 0000000000000000 R09: ffffed10237efed5
R10: ffffed10237efed5 R11: 1ffff110237efed4 R12: dffffc0000000000
R13: 1ffff92000220f7f R14: 0000000000000009 R15: 0000000000000001
FS:  00007ffa4a9816c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9827968178 CR3: 0000000112ee8000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c6 44 24 5f 00       	movb   $0x0,0x5f(%rsp)
   5:	43 0f b6 44 25 00    	movzbl 0x0(%r13,%r12,1),%eax
   b:	84 c0                	test   %al,%al
   d:	48 8b 54 24 08       	mov    0x8(%rsp),%rdx
  12:	0f 85 51 0a 00 00    	jne    0xa69
  18:	44 8b 32             	mov    (%rdx),%r14d
  1b:	4c 8b bc 24 88 00 00 	mov    0x88(%rsp),%r15
  22:	00
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 56 0a 00 00    	jne    0xa8d
  37:	45 8b 3f             	mov    (%r15),%r15d
  3a:	44 89 fe             	mov    %r15d,%esi
  3d:	81                   	.byte 0x81
  3e:	e6 00                	out    %al,$0x0