[ OK ] Started OpenBSD Secure Shell server. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.120' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 113.604659][ T8455] ===================================================== [ 113.611736][ T8455] BUG: KMSAN: uninit-value in bpf_skb_get_nlattr+0x145/0x290 [ 113.619080][ T8455] CPU: 1 PID: 8455 Comm: syz-executor837 Not tainted 5.8.0-rc5-syzkaller #0 [ 113.627717][ T8455] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 113.637744][ T8455] Call Trace: [ 113.641018][ T8455] dump_stack+0x1df/0x240 [ 113.645333][ T8455] kmsan_report+0xf7/0x1e0 [ 113.649729][ T8455] __msan_warning+0x58/0xa0 [ 113.654211][ T8455] bpf_skb_get_nlattr+0x145/0x290 [ 113.659213][ T8455] ___bpf_prog_run+0x214d/0x97a0 [ 113.664129][ T8455] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 113.670258][ T8455] ? bpf_skb_get_pay_offset+0x60/0x60 [ 113.675612][ T8455] __bpf_prog_run32+0x101/0x170 [ 113.680440][ T8455] ? kmsan_get_metadata+0x4f/0x180 [ 113.685527][ T8455] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 113.691307][ T8455] ? ___bpf_prog_run+0x97a0/0x97a0 [ 113.696406][ T8455] sk_filter_trim_cap+0x42a/0xcc0 [ 113.701410][ T8455] ? kmsan_get_metadata+0x11d/0x180 [ 113.706582][ T8455] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 113.712363][ T8455] unix_dgram_sendmsg+0x1987/0x3c30 [ 113.717543][ T8455] ? kmsan_get_metadata+0x11d/0x180 [ 113.722807][ T8455] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 113.728865][ T8455] unix_seqpacket_sendmsg+0x26c/0x2e0 [ 113.734214][ T8455] ? unix_dgram_peer_wake_me+0x7e0/0x7e0 [ 113.739829][ T8455] ____sys_sendmsg+0x1370/0x1400 [ 113.744754][ T8455] __sys_sendmmsg+0x60e/0xd80 [ 113.749403][ T8455] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 113.755452][ T8455] ? sock_setsockopt+0x4be7/0x53c0 [ 113.760550][ T8455] ? security_socket_setsockopt+0x1a6/0x200 [ 113.766420][ T8455] ? kmsan_get_metadata+0x4f/0x180 [ 113.771506][ T8455] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 113.777378][ T8455] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 113.783422][ T8455] ? kmsan_get_metadata+0x11d/0x180 [ 113.788600][ T8455] ? kmsan_get_metadata+0x11d/0x180 [ 113.793777][ T8455] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 113.799905][ T8455] ? __prepare_exit_to_usermode+0x16c/0x4d0 [ 113.805795][ T8455] __se_sys_sendmmsg+0xbd/0xe0 [ 113.810539][ T8455] __x64_sys_sendmmsg+0x56/0x70 [ 113.815375][ T8455] do_syscall_64+0xb0/0x150 [ 113.819853][ T8455] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 113.825715][ T8455] RIP: 0033:0x440339 [ 113.829579][ T8455] Code: Bad RIP value. [ 113.833620][ T8455] RSP: 002b:00007ffc2b07c998 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 113.842004][ T8455] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440339 [ 113.849957][ T8455] RDX: 03fffffffffffe36 RSI: 0000000020001e00 RDI: 0000000000000003 [ 113.857929][ T8455] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 113.865881][ T8455] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b40 [ 113.873830][ T8455] R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000 [ 113.881783][ T8455] [ 113.884081][ T8455] Uninit was stored to memory at: [ 113.889088][ T8455] kmsan_internal_chain_origin+0xad/0x130 [ 113.894793][ T8455] __msan_chain_origin+0x50/0x90 [ 113.899702][ T8455] ___bpf_prog_run+0x6cbe/0x97a0 [ 113.904610][ T8455] __bpf_prog_run32+0x101/0x170 [ 113.909469][ T8455] sk_filter_trim_cap+0x42a/0xcc0 [ 113.914587][ T8455] unix_dgram_sendmsg+0x1987/0x3c30 [ 113.919754][ T8455] unix_seqpacket_sendmsg+0x26c/0x2e0 [ 113.925140][ T8455] ____sys_sendmsg+0x1370/0x1400 [ 113.930045][ T8455] __sys_sendmmsg+0x60e/0xd80 [ 113.934700][ T8455] __se_sys_sendmmsg+0xbd/0xe0 [ 113.939518][ T8455] __x64_sys_sendmmsg+0x56/0x70 [ 113.944342][ T8455] do_syscall_64+0xb0/0x150 [ 113.948819][ T8455] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 113.954675][ T8455] [ 113.957119][ T8455] Uninit was stored to memory at: [ 113.962117][ T8455] kmsan_internal_chain_origin+0xad/0x130 [ 113.967805][ T8455] __msan_chain_origin+0x50/0x90 [ 113.972737][ T8455] ___bpf_prog_run+0x6c64/0x97a0 [ 113.977647][ T8455] __bpf_prog_run32+0x101/0x170 [ 113.982468][ T8455] sk_filter_trim_cap+0x42a/0xcc0 [ 113.987464][ T8455] unix_dgram_sendmsg+0x1987/0x3c30 [ 113.992633][ T8455] unix_seqpacket_sendmsg+0x26c/0x2e0 [ 113.998062][ T8455] ____sys_sendmsg+0x1370/0x1400 [ 114.002970][ T8455] __sys_sendmmsg+0x60e/0xd80 [ 114.007617][ T8455] __se_sys_sendmmsg+0xbd/0xe0 [ 114.012353][ T8455] __x64_sys_sendmmsg+0x56/0x70 [ 114.017176][ T8455] do_syscall_64+0xb0/0x150 [ 114.021650][ T8455] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 114.027509][ T8455] [ 114.029862][ T8455] Local variable ----regs@__bpf_prog_run32 created at: [ 114.036698][ T8455] __bpf_prog_run32+0x87/0x170 [ 114.041531][ T8455] __bpf_prog_run32+0x87/0x170 [ 114.046264][ T8455] ===================================================== [ 114.053163][ T8455] Disabling lock debugging due to kernel taint [ 114.059285][ T8455] Kernel panic - not syncing: panic_on_warn set ... [ 114.065849][ T8455] CPU: 1 PID: 8455 Comm: syz-executor837 Tainted: G B 5.8.0-rc5-syzkaller #0 [ 114.075877][ T8455] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 114.085921][ T8455] Call Trace: [ 114.089189][ T8455] dump_stack+0x1df/0x240 [ 114.093499][ T8455] panic+0x3d5/0xc3e [ 114.097395][ T8455] kmsan_report+0x1df/0x1e0 [ 114.101871][ T8455] __msan_warning+0x58/0xa0 [ 114.106346][ T8455] bpf_skb_get_nlattr+0x145/0x290 [ 114.111346][ T8455] ___bpf_prog_run+0x214d/0x97a0 [ 114.116254][ T8455] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 114.122380][ T8455] ? bpf_skb_get_pay_offset+0x60/0x60 [ 114.127730][ T8455] __bpf_prog_run32+0x101/0x170 [ 114.132557][ T8455] ? kmsan_get_metadata+0x4f/0x180 [ 114.137642][ T8455] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 114.143423][ T8455] ? ___bpf_prog_run+0x97a0/0x97a0 [ 114.148506][ T8455] sk_filter_trim_cap+0x42a/0xcc0 [ 114.153510][ T8455] ? kmsan_get_metadata+0x11d/0x180 [ 114.158683][ T8455] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 114.164482][ T8455] unix_dgram_sendmsg+0x1987/0x3c30 [ 114.169651][ T8455] ? kmsan_get_metadata+0x11d/0x180 [ 114.174829][ T8455] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 114.181066][ T8455] unix_seqpacket_sendmsg+0x26c/0x2e0 [ 114.186463][ T8455] ? unix_dgram_peer_wake_me+0x7e0/0x7e0 [ 114.192072][ T8455] ____sys_sendmsg+0x1370/0x1400 [ 114.196995][ T8455] __sys_sendmmsg+0x60e/0xd80 [ 114.201649][ T8455] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 114.207703][ T8455] ? sock_setsockopt+0x4be7/0x53c0 [ 114.212799][ T8455] ? security_socket_setsockopt+0x1a6/0x200 [ 114.218668][ T8455] ? kmsan_get_metadata+0x4f/0x180 [ 114.223754][ T8455] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 114.229535][ T8455] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 114.235713][ T8455] ? kmsan_get_metadata+0x11d/0x180 [ 114.240899][ T8455] ? kmsan_get_metadata+0x11d/0x180 [ 114.246078][ T8455] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 114.252212][ T8455] ? __prepare_exit_to_usermode+0x16c/0x4d0 [ 114.258093][ T8455] __se_sys_sendmmsg+0xbd/0xe0 [ 114.262852][ T8455] __x64_sys_sendmmsg+0x56/0x70 [ 114.267684][ T8455] do_syscall_64+0xb0/0x150 [ 114.272166][ T8455] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 114.278034][ T8455] RIP: 0033:0x440339 [ 114.281898][ T8455] Code: Bad RIP value. [ 114.285938][ T8455] RSP: 002b:00007ffc2b07c998 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 114.294321][ T8455] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440339 [ 114.302268][ T8455] RDX: 03fffffffffffe36 RSI: 0000000020001e00 RDI: 0000000000000003 [ 114.310244][ T8455] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 114.318192][ T8455] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b40 [ 114.326175][ T8455] R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000 [ 114.335501][ T8455] Kernel Offset: 0x2a600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 114.347108][ T8455] Rebooting in 86400 seconds..