general protection fault, probably for non-canonical address 0xdffffc0000000070: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000380-0x0000000000000387] CPU: 0 PID: 5074 Comm: syz-executor.2 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_build_and_send_test_pkt+0xda/0x1f0 net/llc/llc_sap.c:238 Code: 48 c1 ea 03 80 3c 02 00 0f 85 20 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 10 48 8d bb 80 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f0 00 00 00 48 8b b3 80 03 00 00 48 8d 7d 2e ba RSP: 0018:ffffc9000a697898 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000070 RSI: ffffffff875ccbf8 RDI: 0000000000000380 RBP: ffff8880783cf280 R08: 0000000000000000 R09: 000000000000001f R10: ffffffff875d4257 R11: 0000000000000000 R12: ffff88804fe5d000 R13: ffff88804feb3510 R14: 000000000000007f R15: 0000000000000000 FS: 00007f509bbcd700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f509937a718 CR3: 0000000077f3e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: llc_ui_sendmsg+0x9f9/0x10d0 net/llc/af_llc.c:973 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: 0033:0x7f509aa89049 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:00007f509bbcd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f509ab9c030 RCX: 00007f509aa89049 RDX: 03fffffffffffeed RSI: 0000000020001380 RDI: 0000000000000004 RBP: 00007f509aae308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffead253dbf R14: 00007f509bbcd300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:llc_build_and_send_test_pkt+0xda/0x1f0 net/llc/llc_sap.c:238 Code: 48 c1 ea 03 80 3c 02 00 0f 85 20 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 10 48 8d bb 80 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f0 00 00 00 48 8b b3 80 03 00 00 48 8d 7d 2e ba RSP: 0018:ffffc9000a697898 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000070 RSI: ffffffff875ccbf8 RDI: 0000000000000380 RBP: ffff8880783cf280 R08: 0000000000000000 R09: 000000000000001f R10: ffffffff875d4257 R11: 0000000000000000 R12: ffff88804fe5d000 R13: ffff88804feb3510 R14: 000000000000007f R15: 0000000000000000 FS: 00007f509bbcd700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb40cda0000 CR3: 0000000077f3e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 20 01 00 00 jne 0x12e e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 15: fc ff df 18: 48 8b 5d 10 mov 0x10(%rbp),%rbx 1c: 48 8d bb 80 03 00 00 lea 0x380(%rbx),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 f0 00 00 00 jne 0x124 34: 48 8b b3 80 03 00 00 mov 0x380(%rbx),%rsi 3b: 48 8d 7d 2e lea 0x2e(%rbp),%rdi 3f: ba .byte 0xba