Hello, syzbot found the following issue on: HEAD commit: 8ce4f287524c net: libwx: fix firmware mailbox abnormal ret.. git tree: net console+strace: https://syzkaller.appspot.com/x/log.txt?x=13f06edf980000 kernel config: https://syzkaller.appspot.com/x/.config?x=1c541fa8af5c9cc7 dashboard link: https://syzkaller.appspot.com/bug?extid=3affdbfc986ecd9200fd compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15695418580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=124c56f8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e09bf4b8939b/disk-8ce4f287.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f7f7846f83db/vmlinux-8ce4f287.xz kernel image: https://storage.googleapis.com/syzbot-assets/44540dea47ac/bzImage-8ce4f287.xz The issue was bisected to: commit 69139d2919dd4aa9a553c8245e7c63e82613e3fc Author: Cong Wang <cong.wang@xxxxxxxxxxxxx> Date: Mon Aug 12 02:21:53 2024 +0000 vsock: fix recursive ->recvmsg calls bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=116bc4b0580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=136bc4b0580000 console output: https://syzkaller.appspot.com/x/log.txt?x=156bc4b0580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3affdbfc986ecd9200fd@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 69139d2919dd ("vsock: fix recursive ->recvmsg calls") Oops: general protection fault, probably for non-canonical address 0xdffffc0000000014: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000a0-0x00000000000000a7] CPU: 1 UID: 0 PID: 5828 Comm: syz-executor976 Not tainted 6.13.0-rc5-syzkaller-00142-g8ce4f287524c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:vsock_connectible_has_data+0x85/0x100 net/vmw_vsock/af_vsock.c:882 Code: 80 3c 38 00 74 08 48 89 df e8 e7 e0 5f f6 48 8b 1b 66 83 fd 05 75 3a e8 d9 78 f9 f5 48 81 c3 a0 00 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 bc e0 5f f6 4c 8b 1b 4c 89 f7 41 RSP: 0018:ffffc900015976f8 EFLAGS: 00010206 RAX: 0000000000000014 RBX: 00000000000000a0 RCX: ffff888033e09e00 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005 RBP: 0000000000000005 R08: ffffffff8ba5fadc R09: 1ffffffff285492b R10: dffffc0000000000 R11: fffffbfff285492c R12: 0000000000002000 R13: dffffc0000000000 R14: ffff888033e18000 R15: dffffc0000000000 FS: 00005555565ca380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200061c8 CR3: 0000000074f74000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> vsock_has_data net/vmw_vsock/vsock_bpf.c:30 [inline] vsock_bpf_recvmsg+0x4b5/0x10a0 net/vmw_vsock/vsock_bpf.c:87 sock_recvmsg_nosec net/socket.c:1033 [inline] sock_recvmsg+0x22f/0x280 net/socket.c:1055 ____sys_recvmsg+0x1c6/0x480 net/socket.c:2803 ___sys_recvmsg net/socket.c:2845 [inline] do_recvmmsg+0x426/0xab0 net/socket.c:2940 __sys_recvmmsg net/socket.c:3014 [inline] __do_sys_recvmmsg net/socket.c:3037 [inline] __se_sys_recvmmsg net/socket.c:3030 [inline] __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3030 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb38b2465e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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:00007fffd43f6938 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007fffd43f6b08 RCX: 00007fb38b2465e9 RDX: 0000000000000001 RSI: 00000000200061c0 RDI: 0000000000000003 RBP: 00007fb38b2b9610 R08: 0000000000000000 R09: 00007fffd43f6b08 R10: 0000000000002000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fffd43f6af8 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:vsock_connectible_has_data+0x85/0x100 net/vmw_vsock/af_vsock.c:882 Code: 80 3c 38 00 74 08 48 89 df e8 e7 e0 5f f6 48 8b 1b 66 83 fd 05 75 3a e8 d9 78 f9 f5 48 81 c3 a0 00 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 bc e0 5f f6 4c 8b 1b 4c 89 f7 41 RSP: 0018:ffffc900015976f8 EFLAGS: 00010206 RAX: 0000000000000014 RBX: 00000000000000a0 RCX: ffff888033e09e00 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005 RBP: 0000000000000005 R08: ffffffff8ba5fadc R09: 1ffffffff285492b R10: dffffc0000000000 R11: fffffbfff285492c R12: 0000000000002000 R13: dffffc0000000000 R14: ffff888033e18000 R15: dffffc0000000000 FS: 00005555565ca380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000066c7e0 CR3: 0000000074f74000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 80 3c 38 00 cmpb $0x0,(%rax,%rdi,1) 4: 74 08 je 0xe 6: 48 89 df mov %rbx,%rdi 9: e8 e7 e0 5f f6 call 0xf65fe0f5 e: 48 8b 1b mov (%rbx),%rbx 11: 66 83 fd 05 cmp $0x5,%bp 15: 75 3a jne 0x51 17: e8 d9 78 f9 f5 call 0xf5f978f5 1c: 48 81 c3 a0 00 00 00 add $0xa0,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 bc e0 5f f6 call 0xf65fe0f5 39: 4c 8b 1b mov (%rbx),%r11 3c: 4c 89 f7 mov %r14,%rdi 3f: 41 rex.B --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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
