general protection fault, probably for non-canonical address 0xdffffc000000001b: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000d8-0x00000000000000df] CPU: 0 PID: 7567 Comm: syz-executor.1 Tainted: G W 5.17.0-syzkaller-10752-g52d543b5497c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:llc_ui_sendmsg+0x2c0/0x13f0 net/llc/af_llc.c:947 Code: 08 48 89 df e8 a1 95 8b f9 48 89 5c 24 50 4c 8b 23 4d 8d b4 24 de 00 00 00 4c 89 f0 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df <42> 8a 04 28 84 c0 0f 85 e4 07 00 00 41 0f b7 06 48 89 44 24 38 48 RSP: 0018:ffffc90003327820 EFLAGS: 00010207 RAX: 000000000000001b RBX: ffff8880775c9538 RCX: 0000000000040000 RDX: ffffc90014679000 RSI: 0000000000000098 RDI: 0000000000000099 RBP: ffffc90003327970 R08: ffffffff884c9f11 R09: ffffed100eeb920d R10: ffffed100eeb920d R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 00000000000000de R15: 1ffff92000664f14 FS: 00007f26671c5700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001380 CR3: 0000000074cf7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] ____sys_sendmsg+0x5b9/0x910 net/socket.c:2413 ___sys_sendmsg net/socket.c:2467 [inline] __sys_sendmmsg+0x3ba/0x750 net/socket.c:2553 __do_sys_sendmmsg net/socket.c:2582 [inline] __se_sys_sendmmsg net/socket.c:2579 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2579 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f2666089049 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:00007f26671c5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f266619c030 RCX: 00007f2666089049 RDX: 03fffffffffffeed RSI: 0000000020001380 RDI: 0000000000000006 RBP: 00007f26660e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcac43b1df R14: 00007f26671c5300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:llc_ui_sendmsg+0x2c0/0x13f0 net/llc/af_llc.c:947 Code: 08 48 89 df e8 a1 95 8b f9 48 89 5c 24 50 4c 8b 23 4d 8d b4 24 de 00 00 00 4c 89 f0 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df <42> 8a 04 28 84 c0 0f 85 e4 07 00 00 41 0f b7 06 48 89 44 24 38 48 RSP: 0018:ffffc90003327820 EFLAGS: 00010207 RAX: 000000000000001b RBX: ffff8880775c9538 RCX: 0000000000040000 RDX: ffffc90014679000 RSI: 0000000000000098 RDI: 0000000000000099 RBP: ffffc90003327970 R08: ffffffff884c9f11 R09: ffffed100eeb920d R10: ffffed100eeb920d R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 00000000000000de R15: 1ffff92000664f14 FS: 00007f26671c5700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbde51ca010 CR3: 0000000074cf7000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 08 48 89 or %cl,-0x77(%rax) 3: df e8 fucomip %st(0),%st 5: a1 95 8b f9 48 89 5c movabs 0x50245c8948f98b95,%eax c: 24 50 e: 4c 8b 23 mov (%rbx),%r12 11: 4d 8d b4 24 de 00 00 lea 0xde(%r12),%r14 18: 00 19: 4c 89 f0 mov %r14,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 27: fc ff df * 2a: 42 8a 04 28 mov (%rax,%r13,1),%al <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 e4 07 00 00 jne 0x81a 36: 41 0f b7 06 movzwl (%r14),%eax 3a: 48 89 44 24 38 mov %rax,0x38(%rsp) 3f: 48 rex.W