general protection fault, probably for non-canonical address 0xdffffc000000001b: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000d8-0x00000000000000df] CPU: 1 PID: 10090 Comm: syz-executor.1 Tainted: G W 5.17.0-syzkaller-04796-g169e77764adc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:llc_ui_sendmsg+0x1ea/0x10d0 net/llc/af_llc.c:947 Code: 80 3c 02 00 0f 85 50 0d 00 00 4c 8b a5 38 05 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 de 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 33 RSP: 0018:ffffc9000b3578c8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffffc9000b357d70 RCX: 0000000000000000 RDX: 000000000000001b RSI: ffffffff875d3ec3 RDI: 00000000000000de RBP: ffff888043697000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff875d3eb5 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888073f00618 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f543f2b5700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e23f000 CR3: 000000001bc18000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x331/0x810 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmmsg+0x195/0x470 net/socket.c:2553 __do_sys_sendmmsg net/socket.c:2582 [inline] __se_sys_sendmmsg net/socket.c:2579 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2579 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f543e089049 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f543f2b5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f543e19c030 RCX: 00007f543e089049 RDX: 0000000000000002 RSI: 0000000020002dc0 RDI: 0000000000000004 RBP: 00007f543e0e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000051 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdbdc143cf R14: 00007f543f2b5300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:llc_ui_sendmsg+0x1ea/0x10d0 net/llc/af_llc.c:947 Code: 80 3c 02 00 0f 85 50 0d 00 00 4c 8b a5 38 05 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 de 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 33 RSP: 0018:ffffc9000b3578c8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffffc9000b357d70 RCX: 0000000000000000 RDX: 000000000000001b RSI: ffffffff875d3ec3 RDI: 00000000000000de RBP: ffff888043697000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff875d3eb5 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888073f00618 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f543f2b5700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000001bc18000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 4: 0f 85 50 0d 00 00 jne 0xd5a a: 4c 8b a5 38 05 00 00 mov 0x538(%rbp),%r12 11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 18: fc ff df 1b: 49 8d bc 24 de 00 00 lea 0xde(%r12),%rdi 22: 00 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 48 89 f8 mov %rdi,%rax 31: 83 e0 07 and $0x7,%eax 34: 83 c0 01 add $0x1,%eax 37: 38 d0 cmp %dl,%al 39: 7c 08 jl 0x43 3b: 84 d2 test %dl,%dl 3d: 0f .byte 0xf 3e: 85 33 test %esi,(%rbx)