[syzbot] [net?] general protection fault in sigd_send
From: syzbot <hidden>
Date: 2025-10-30 16:54:41
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Hello, syzbot found the following issue on: HEAD commit: 84a905290cb4 net: phy: dp83867: Disable EEE support as not.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=113d2932580000 kernel config: https://syzkaller.appspot.com/x/.config?x=67b63a24f3c26fca dashboard link: https://syzkaller.appspot.com/bug?extid=1f22cb1769f249df9fa0 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=119627e2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16bc6f34580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/833b328a19a9/disk-84a90529.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1d97a2ab2baf/vmlinux-84a90529.xz kernel image: https://storage.googleapis.com/syzbot-assets/cb504e793493/bzImage-84a90529.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1f22cb1769f249df9fa0@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000008034: 0000 [#1] SMP KASAN PTI KASAN: probably user-memory-access in range [0x00000000000401a0-0x00000000000401a7] CPU: 1 UID: 0 PID: 6129 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:sigd_send+0x48d/0xf90 net/atm/signaling.c:78 Code: 8d 67 14 4c 89 e0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 91 07 00 00 31 ed 41 2b 2c 24 49 8d be 9c 01 00 00 48 89 f8 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 8f 07 00 00 41 89 ae 9c 01 00 00 49 8d be RSP: 0018:ffffc90003737820 EFLAGS: 00010202 RAX: 0000000000008034 RBX: dffffc0000000000 RCX: 0000000000000005 RDX: ffffffff8a75f9af RSI: ffffffff8f4cf240 RDI: 00000000000401a0 RBP: 0000000000000000 R08: ffff88802cf50000 R09: 0000000000000007 R10: 000000000000000f R11: 0000000000000000 R12: ffff888058c8ea54 R13: 1ffff1100b191d48 R14: 0000000000040004 R15: ffff888058c8ea40 FS: 00007f9e83ba46c0(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f91aa192e9c CR3: 000000003195e000 CR4: 00000000003526f0 Call Trace: <TASK> vcc_sendmsg+0xb2e/0xd70 net/atm/common.c:650 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x830 net/socket.c:2630 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684 __sys_sendmsg net/socket.c:2716 [inline] __do_sys_sendmsg net/socket.c:2721 [inline] __se_sys_sendmsg net/socket.c:2719 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9e82d8efc9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9e83ba4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9e82fe5fa0 RCX: 00007f9e82d8efc9 RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000004 RBP: 00007f9e82e11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9e82fe6038 R14: 00007f9e82fe5fa0 R15: 00007fffa761f4e8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:sigd_send+0x48d/0xf90 net/atm/signaling.c:78 Code: 8d 67 14 4c 89 e0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 91 07 00 00 31 ed 41 2b 2c 24 49 8d be 9c 01 00 00 48 89 f8 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 8f 07 00 00 41 89 ae 9c 01 00 00 49 8d be RSP: 0018:ffffc90003737820 EFLAGS: 00010202 RAX: 0000000000008034 RBX: dffffc0000000000 RCX: 0000000000000005 RDX: ffffffff8a75f9af RSI: ffffffff8f4cf240 RDI: 00000000000401a0 RBP: 0000000000000000 R08: ffff88802cf50000 R09: 0000000000000007 R10: 000000000000000f R11: 0000000000000000 R12: ffff888058c8ea54 R13: 1ffff1100b191d48 R14: 0000000000040004 R15: ffff888058c8ea40 FS: 00007f9e83ba46c0(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f91aa192e9c CR3: 000000003195e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 8d 67 14 lea 0x14(%rdi),%esp 3: 4c 89 e0 mov %r12,%rax 6: 48 c1 e8 03 shr $0x3,%rax a: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax e: 84 c0 test %al,%al 10: 0f 85 91 07 00 00 jne 0x7a7 16: 31 ed xor %ebp,%ebp 18: 41 2b 2c 24 sub (%r12),%ebp 1c: 49 8d be 9c 01 00 00 lea 0x19c(%r14),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 8f 07 00 00 jne 0x7c5 36: 41 89 ae 9c 01 00 00 mov %ebp,0x19c(%r14) 3d: 49 rex.WB 3e: 8d .byte 0x8d 3f: be .byte 0xbe --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup