syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7]
CPU: 1 PID: 2467 Comm: syz.6.697 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:sk_psock_verdict_data_ready+0x143/0x1d0 net/core/skmsg.c:1256
Code: 24 50 48 c7 44 24 48 01 00 00 00 43 80 3c 2e 00 74 08 4c 89 ff e8 cd 1b d1 fd 41 bc c0 00 00 00 4d 03 27 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 ae 1b d1 fd 48 8b 7c 24 18 48 8d
RSP: 0018:ffffc90000e077e0 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 1ffff920001c0f00 RCX: ffff888128da62c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90000e07840
RBP: ffffc90000e078b0 R08: ffffc90000e0783f R09: ffffc90000e07820
R10: dffffc0000000000 R11: fffff520001c0f08 R12: 00000000000000c0
R13: dffffc0000000000 R14: 1ffff110241ef084 R15: ffff888120f78420
FS:  00007ff024dcd6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003ff6 CR3: 000000011afb1000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 unix_stream_sendmsg+0x7d1/0xc90 net/unix/af_unix.c:2117
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2436
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg net/socket.c:2526 [inline]
 __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2526
 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff024f68cb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff024dcd028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff0251e3fa0 RCX: 00007ff024f68cb9
RDX: 0200000000000000 RSI: 0000200000000500 RDI: 0000000000000007
RBP: 00007ff024fd6bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff0251e4038 R14: 00007ff0251e3fa0 R15: 00007ffe0c2eb1a8
 </TASK>
Modules linked in:
---[ end trace 16683d34a9a9c094 ]---
RIP: 0010:sk_psock_verdict_data_ready+0x143/0x1d0 net/core/skmsg.c:1256
Code: 24 50 48 c7 44 24 48 01 00 00 00 43 80 3c 2e 00 74 08 4c 89 ff e8 cd 1b d1 fd 41 bc c0 00 00 00 4d 03 27 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 ae 1b d1 fd 48 8b 7c 24 18 48 8d
RSP: 0018:ffffc90000e077e0 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 1ffff920001c0f00 RCX: ffff888128da62c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90000e07840
RBP: ffffc90000e078b0 R08: ffffc90000e0783f R09: ffffc90000e07820
R10: dffffc0000000000 R11: fffff520001c0f08 R12: 00000000000000c0
R13: dffffc0000000000 R14: 1ffff110241ef084 R15: ffff888120f78420
FS:  00007ff024dcd6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000004bb000 CR3: 000000011afb1000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	24 50                	and    $0x50,%al
   2:	48 c7 44 24 48 01 00 	movq   $0x1,0x48(%rsp)
   9:	00 00
   b:	43 80 3c 2e 00       	cmpb   $0x0,(%r14,%r13,1)
  10:	74 08                	je     0x1a
  12:	4c 89 ff             	mov    %r15,%rdi
  15:	e8 cd 1b d1 fd       	call   0xfdd11be7
  1a:	41 bc c0 00 00 00    	mov    $0xc0,%r12d
  20:	4d 03 27             	add    (%r15),%r12
  23:	4c 89 e0             	mov    %r12,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 e7             	mov    %r12,%rdi
  34:	e8 ae 1b d1 fd       	call   0xfdd11be7
  39:	48 8b 7c 24 18       	mov    0x18(%rsp),%rdi
  3e:	48                   	rex.W
  3f:	8d                   	.byte 0x8d