./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3428307716 <...> Warning: Permanently added '10.128.1.66' (ED25519) to the list of known hosts. execve("./syz-executor3428307716", ["./syz-executor3428307716"], 0x7ffecc367960 /* 10 vars */) = 0 brk(NULL) = 0x55555732f000 brk(0x55555732fd00) = 0x55555732fd00 arch_prctl(ARCH_SET_FS, 0x55555732f380) = 0 set_tid_address(0x55555732f650) = 5005 set_robust_list(0x55555732f660, 24) = 0 rseq(0x55555732fca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3428307716", 4096) = 28 getrandom("\x79\x11\x9e\x18\x1f\x8c\x76\x58", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555732fd00 brk(0x555557350d00) = 0x555557350d00 brk(0x555557351000) = 0x555557351000 mprotect(0x7efd89466000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55555732f650) = 5006 ./strace-static-x86_64: Process 5006 attached [pid 5006] set_robust_list(0x55555732f660, 24) = 0 [pid 5006] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5006] setpgid(0, 0) = 0 [pid 5006] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5006] write(3, "1000", 4) = 4 [pid 5006] close(3) = 0 [pid 5006] openat(AT_FDCWD, "/dev/net/tun", O_WRONLY|O_CREAT|O_TRUNC|O_NOATIME, 000) = 3 [pid 5006] ioctl(3, TUNSETIFF, 0x20000200) = 0 [pid 5006] socket(AF_INET, SOCK_PACKET, IPPROTO_IGMP) = 4 [pid 5006] ioctl(4, SIOCSIFFLAGS, {ifr_name="syzkaller1", ifr_flags=IFF_UP|IFF_DYNAMIC}) = 0 [ 139.484006][ T5006] syz-executor342 uses obsolete (PF_INET,SOCK_PACKET) [ 139.512187][ T5006] ===================================================== [ 139.519551][ T5006] BUG: KMSAN: uninit-value in __llc_lookup_established+0xe9d/0xf90 [ 139.527651][ T5006] __llc_lookup_established+0xe9d/0xf90 [ 139.533501][ T5006] llc_conn_handler+0x4bd/0x1360 [ 139.538630][ T5006] llc_rcv+0xfec/0x1550 [ 139.542991][ T5006] __netif_receive_skb+0x1a6/0x5a0 [ 139.548279][ T5006] netif_receive_skb+0x58/0x660 [ 139.553342][ T5006] tun_rx_batched+0x3ee/0x980 [ 139.558185][ T5006] tun_get_user+0x53af/0x66d0 [ 139.563083][ T5006] tun_chr_write_iter+0x3af/0x5d0 [ 139.568268][ T5006] vfs_write+0x8ef/0x1490 [ 139.572790][ T5006] ksys_write+0x20f/0x4c0 [ 139.577260][ T5006] __x64_sys_write+0x93/0xd0 [ 139.582049][ T5006] do_syscall_64+0x44/0x110 [ 139.586716][ T5006] entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 139.592853][ T5006] [ 139.595252][ T5006] Local variable daddr created at: [ 139.600561][ T5006] llc_conn_handler+0x53/0x1360 [ 139.605589][ T5006] llc_rcv+0xfec/0x1550 [ 139.609998][ T5006] [ 139.612404][ T5006] CPU: 1 PID: 5006 Comm: syz-executor342 Not tainted 6.7.0-rc6-syzkaller-00010-g2cf4f94d8e86 #0 [ 139.623086][ T5006] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 [ 139.633321][ T5006] ===================================================== [ 139.640452][ T5006] Disabling lock debugging due to kernel taint [ 139.646696][ T5006] Kernel panic - not syncing: kmsan.panic set ... [ 139.653206][ T5006] CPU: 1 PID: 5006 Comm: syz-executor342 Tainted: G B 6.7.0-rc6-syzkaller-00010-g2cf4f94d8e86 #0 [ 139.665249][ T5006] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 [ 139.675418][ T5006] Call Trace: [ 139.678787][ T5006] [ 139.681812][ T5006] dump_stack_lvl+0x1bf/0x240 [ 139.686666][ T5006] dump_stack+0x1e/0x20 [ 139.690983][ T5006] panic+0x4de/0xc90 [ 139.695029][ T5006] ? add_taint+0x108/0x1a0 [ 139.699603][ T5006] kmsan_report+0x2d0/0x2d0 [ 139.704281][ T5006] ? kmsan_slab_free+0xd1/0x130 [ 139.709307][ T5006] ? snap_rcv+0x3c0/0x4f0 [ 139.713791][ T5006] ? llc_rcv+0xf64/0x1550 [ 139.718270][ T5006] ? __netif_receive_skb+0x1a6/0x5a0 [ 139.723737][ T5006] ? netif_receive_skb+0x58/0x660 [ 139.728918][ T5006] ? tun_rx_batched+0x3ee/0x980 [ 139.733935][ T5006] ? __msan_warning+0x96/0x110 [ 139.738871][ T5006] ? __llc_lookup_established+0xe9d/0xf90 [ 139.744788][ T5006] ? llc_conn_handler+0x4bd/0x1360 [ 139.750085][ T5006] ? llc_rcv+0xfec/0x1550 [ 139.754557][ T5006] ? __netif_receive_skb+0x1a6/0x5a0 [ 139.760028][ T5006] ? netif_receive_skb+0x58/0x660 [ 139.765201][ T5006] ? tun_rx_batched+0x3ee/0x980 [ 139.770218][ T5006] ? tun_get_user+0x53af/0x66d0 [ 139.775228][ T5006] ? tun_chr_write_iter+0x3af/0x5d0 [ 139.780598][ T5006] ? vfs_write+0x8ef/0x1490 [ 139.785238][ T5006] ? ksys_write+0x20f/0x4c0 [ 139.789886][ T5006] ? __x64_sys_write+0x93/0xd0 [ 139.794791][ T5006] ? do_syscall_64+0x44/0x110 [ 139.799634][ T5006] ? entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 139.805902][ T5006] ? kmsan_internal_chain_origin+0xba/0xd0 [ 139.811892][ T5006] ? entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 139.818144][ T5006] ? kmsan_internal_chain_origin+0x57/0xd0 [ 139.824144][ T5006] ? __msan_chain_origin+0xc1/0x140 [ 139.829524][ T5006] ? __skb_clone+0x588/0x650 [ 139.834281][ T5006] ? skb_clone+0x3aa/0x540 [ 139.838870][ T5006] ? llc_rcv+0xeff/0x1550 [ 139.843345][ T5006] ? __netif_receive_skb+0x1a6/0x5a0 [ 139.848807][ T5006] ? netif_receive_skb+0x58/0x660 [ 139.853981][ T5006] ? tun_rx_batched+0x3ee/0x980 [ 139.858993][ T5006] ? tun_get_user+0x53af/0x66d0 [ 139.863998][ T5006] ? tun_chr_write_iter+0x3af/0x5d0 [ 139.869352][ T5006] ? vfs_write+0x8ef/0x1490 [ 139.873989][ T5006] ? ksys_write+0x20f/0x4c0 [ 139.878621][ T5006] ? __x64_sys_write+0x93/0xd0 [ 139.883521][ T5006] ? do_syscall_64+0x44/0x110 [ 139.888361][ T5006] ? entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 139.894624][ T5006] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 139.900630][ T5006] __msan_warning+0x96/0x110 [ 139.905394][ T5006] __llc_lookup_established+0xe9d/0xf90 [ 139.911139][ T5006] ? _raw_spin_unlock_irqrestore+0x3f/0x60 [ 139.917132][ T5006] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 139.923137][ T5006] llc_conn_handler+0x4bd/0x1360 [ 139.928269][ T5006] ? snap_rcv+0x45a/0x4f0 [ 139.932767][ T5006] ? llc_sap_remove_socket+0x4e0/0x4e0 [ 139.938417][ T5006] llc_rcv+0xfec/0x1550 [ 139.942727][ T5006] ? snap_request+0x110/0x110 [ 139.947568][ T5006] __netif_receive_skb+0x1a6/0x5a0 [ 139.952868][ T5006] ? llc_set_station_handler+0x70/0x70 [ 139.958494][ T5006] netif_receive_skb+0x58/0x660 [ 139.963505][ T5006] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 139.969507][ T5006] ? tun_rx_batched+0x37c/0x980 [ 139.974517][ T5006] tun_rx_batched+0x3ee/0x980 [ 139.979364][ T5006] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 139.985360][ T5006] tun_get_user+0x53af/0x66d0 [ 139.990196][ T5006] ? kmsan_internal_set_shadow_origin+0x66/0xe0 [ 139.996647][ T5006] ? generic_file_llseek_size+0x250/0x560 [ 140.002594][ T5006] tun_chr_write_iter+0x3af/0x5d0 [ 140.007794][ T5006] ? tun_chr_read_iter+0x670/0x670 [ 140.013066][ T5006] vfs_write+0x8ef/0x1490 [ 140.017554][ T5006] ksys_write+0x20f/0x4c0 [ 140.022030][ T5006] __x64_sys_write+0x93/0xd0 [ 140.026763][ T5006] do_syscall_64+0x44/0x110 [ 140.031428][ T5006] entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 140.037500][ T5006] RIP: 0033:0x7efd893f3b39 [ 140.042030][ T5006] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 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 [ 140.061811][ T5006] RSP: 002b:00007ffef04ff198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 140.070378][ T5006] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efd893f3b39 [ 140.078477][ T5006] RDX: 0000000000000016 RSI: 0000000020000040 RDI: 0000000000000003 [ 140.086570][ T5006] RBP: 00007efd894665f0 R08: 0000000000000006 R09: 0000000000000006 [ 140.094662][ T5006] R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000001 [ 140.102752][ T5006] R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 [ 140.110863][ T5006] [ 140.114185][ T5006] Kernel Offset: disabled [ 140.118549][ T5006] Rebooting in 86400 seconds..