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: 4054 Comm: syz-executor734 Not tainted 5.17.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:llc_ui_sendmsg+0x1ad/0xf20 net/llc/af_llc.c:947 Code: 03 80 3c 02 00 0f 85 6f 0b 00 00 4c 8b b5 38 05 00 00 48 ba 00 00 00 00 00 fc ff df 49 8d be de 00 00 00 48 89 f9 48 c1 e9 03 <0f> b6 0c 11 48 89 fa 83 e2 07 83 c2 01 38 ca 7c 08 84 c9 0f 85 16 RSP: 0018:ffffc900048a78d8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 000000000000001b RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 00000000000000de RBP: ffff88801e5b2000 R08: 0000000000000000 R09: ffff88801e5b2538 R10: ffffed1003cb640c R11: 0000000000000000 R12: ffff88801e5b2508 R13: ffff888073702a00 R14: 0000000000000000 R15: ffffc900048a7d70 FS: 00007f316e25d700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000f038 CR3: 0000000079d8d000 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+0xab/0xe0 net/socket.c:725 ____sys_sendmsg+0x392/0x7a0 net/socket.c:2413 ___sys_sendmsg+0xd3/0x150 net/socket.c:2467 __sys_sendmmsg+0x141/0x310 net/socket.c:2553 __do_sys_sendmmsg net/socket.c:2582 [inline] __se_sys_sendmmsg net/socket.c:2579 [inline] __x64_sys_sendmmsg+0x94/0x100 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: 0033:0x7f316e2cc8c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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:00007f316e25d318 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f316e3543f8 RCX: 00007f316e2cc8c9 RDX: 03fffffffffffeed RSI: 0000000020001380 RDI: 0000000000000003 RBP: 00007f316e3543f0 R08: 00007f316e25d700 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f316e3543fc R13: 00007fff5826f71f R14: 00007f316e25d400 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:llc_ui_sendmsg+0x1ad/0xf20 net/llc/af_llc.c:947 Code: 03 80 3c 02 00 0f 85 6f 0b 00 00 4c 8b b5 38 05 00 00 48 ba 00 00 00 00 00 fc ff df 49 8d be de 00 00 00 48 89 f9 48 c1 e9 03 <0f> b6 0c 11 48 89 fa 83 e2 07 83 c2 01 38 ca 7c 08 84 c9 0f 85 16 RSP: 0018:ffffc900048a78d8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 000000000000001b RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 00000000000000de RBP: ffff88801e5b2000 R08: 0000000000000000 R09: ffff88801e5b2538 R10: ffffed1003cb640c R11: 0000000000000000 R12: ffff88801e5b2508 R13: ffff888073702a00 R14: 0000000000000000 R15: ffffc900048a7d70 FS: 00007f316e25d700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000f038 CR3: 0000000079d8d000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax 6: 85 6f 0b test %ebp,0xb(%rdi) 9: 00 00 add %al,(%rax) b: 4c 8b b5 38 05 00 00 mov 0x538(%rbp),%r14 12: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 19: fc ff df 1c: 49 8d be de 00 00 00 lea 0xde(%r14),%rdi 23: 48 89 f9 mov %rdi,%rcx 26: 48 c1 e9 03 shr $0x3,%rcx * 2a: 0f b6 0c 11 movzbl (%rcx,%rdx,1),%ecx <-- trapping instruction 2e: 48 89 fa mov %rdi,%rdx 31: 83 e2 07 and $0x7,%edx 34: 83 c2 01 add $0x1,%edx 37: 38 ca cmp %cl,%dl 39: 7c 08 jl 0x43 3b: 84 c9 test %cl,%cl 3d: 0f .byte 0xf 3e: 85 16 test %edx,(%rsi)