[ 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 '10.128.0.80' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 127.578868][ T33] audit: type=1400 audit(1595201129.781:8): avc: denied { execmem } for pid=8447 comm="syz-executor307" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 127.600411][ T8447] ===================================================== [ 127.607385][ T8447] BUG: KMSAN: uninit-value in sk_filter_trim_cap+0x828/0xcc0 [ 127.614772][ T8447] CPU: 0 PID: 8447 Comm: syz-executor307 Not tainted 5.8.0-rc5-syzkaller #0 [ 127.623441][ T8447] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 127.633499][ T8447] Call Trace: [ 127.637048][ T8447] dump_stack+0x1df/0x240 [ 127.641374][ T8447] kmsan_report+0xf7/0x1e0 [ 127.645809][ T8447] __msan_warning+0x58/0xa0 [ 127.650457][ T8447] sk_filter_trim_cap+0x828/0xcc0 [ 127.655484][ T8447] ? kmsan_get_metadata+0x11d/0x180 [ 127.660688][ T8447] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 127.666485][ T8447] unix_dgram_sendmsg+0x1987/0x3c30 [ 127.671684][ T8447] ? unix_dgram_poll+0xa80/0xa80 [ 127.676605][ T8447] ____sys_sendmsg+0x1370/0x1400 [ 127.681530][ T8447] __sys_sendmmsg+0x876/0xd80 [ 127.686209][ T8447] ? kmsan_get_metadata+0x11d/0x180 [ 127.691569][ T8447] ? _raw_spin_unlock_bh+0x4b/0x60 [ 127.696657][ T8447] ? kmsan_get_metadata+0x11d/0x180 [ 127.701851][ T8447] ? kmsan_set_origin_checked+0x95/0xf0 [ 127.707376][ T8447] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 127.713420][ T8447] ? kmsan_get_metadata+0x4f/0x180 [ 127.718512][ T8447] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 127.724300][ T8447] ? kmsan_get_metadata+0x11d/0x180 [ 127.729480][ T8447] ? kmsan_get_metadata+0x11d/0x180 [ 127.734685][ T8447] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 127.740483][ T8447] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 127.746621][ T8447] ? kmsan_get_metadata+0x4f/0x180 [ 127.751740][ T8447] ? kmsan_get_metadata+0x4f/0x180 [ 127.756863][ T8447] __se_compat_sys_sendmmsg+0xcd/0xf0 [ 127.762216][ T8447] ? __x32_compat_sys_sendmsg+0x70/0x70 [ 127.767762][ T8447] __ia32_compat_sys_sendmmsg+0x56/0x70 [ 127.773310][ T8447] __do_fast_syscall_32+0x2aa/0x400 [ 127.778738][ T8447] do_fast_syscall_32+0x6b/0xd0 [ 127.783572][ T8447] do_SYSENTER_32+0x73/0x90 [ 127.788058][ T8447] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 127.794361][ T8447] RIP: 0023:0xf7fbb549 [ 127.798406][ T8447] Code: Bad RIP value. [ 127.802538][ T8447] RSP: 002b:00000000ffa7189c EFLAGS: 00000286 ORIG_RAX: 0000000000000159 [ 127.811021][ T8447] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020001e00 [ 127.818988][ T8447] RDX: 00000000fffffe36 RSI: 0000000000000000 RDI: 0000000000000010 [ 127.826945][ T8447] RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000 [ 127.834927][ T8447] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 127.842879][ T8447] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 127.850871][ T8447] [ 127.853191][ T8447] Uninit was stored to memory at: [ 127.858205][ T8447] kmsan_internal_chain_origin+0xad/0x130 [ 127.863902][ T8447] __msan_chain_origin+0x50/0x90 [ 127.868844][ T8447] ___bpf_prog_run+0x6c64/0x97a0 [ 127.873757][ T8447] __bpf_prog_run32+0x101/0x170 [ 127.878586][ T8447] sk_filter_trim_cap+0x42a/0xcc0 [ 127.883589][ T8447] unix_dgram_sendmsg+0x1987/0x3c30 [ 127.888770][ T8447] ____sys_sendmsg+0x1370/0x1400 [ 127.893688][ T8447] __sys_sendmmsg+0x876/0xd80 [ 127.898341][ T8447] __se_compat_sys_sendmmsg+0xcd/0xf0 [ 127.903690][ T8447] __ia32_compat_sys_sendmmsg+0x56/0x70 [ 127.909215][ T8447] __do_fast_syscall_32+0x2aa/0x400 [ 127.914418][ T8447] do_fast_syscall_32+0x6b/0xd0 [ 127.919256][ T8447] do_SYSENTER_32+0x73/0x90 [ 127.923761][ T8447] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 127.930082][ T8447] [ 127.932386][ T8447] Local variable ----regs@__bpf_prog_run32 created at: [ 127.939230][ T8447] __bpf_prog_run32+0x87/0x170 [ 127.944056][ T8447] __bpf_prog_run32+0x87/0x170 [ 127.948789][ T8447] ===================================================== [ 127.955693][ T8447] Disabling lock debugging due to kernel taint [ 127.961821][ T8447] Kernel panic - not syncing: panic_on_warn set ... [ 127.968651][ T8447] CPU: 0 PID: 8447 Comm: syz-executor307 Tainted: G B 5.8.0-rc5-syzkaller #0 [ 127.978692][ T8447] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 127.988733][ T8447] Call Trace: [ 127.992013][ T8447] dump_stack+0x1df/0x240 [ 127.996323][ T8447] panic+0x3d5/0xc3e [ 128.000236][ T8447] kmsan_report+0x1df/0x1e0 [ 128.004727][ T8447] __msan_warning+0x58/0xa0 [ 128.009215][ T8447] sk_filter_trim_cap+0x828/0xcc0 [ 128.014229][ T8447] ? kmsan_get_metadata+0x11d/0x180 [ 128.019412][ T8447] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 128.025221][ T8447] unix_dgram_sendmsg+0x1987/0x3c30 [ 128.030429][ T8447] ? unix_dgram_poll+0xa80/0xa80 [ 128.035347][ T8447] ____sys_sendmsg+0x1370/0x1400 [ 128.040275][ T8447] __sys_sendmmsg+0x876/0xd80 [ 128.044933][ T8447] ? kmsan_get_metadata+0x11d/0x180 [ 128.050126][ T8447] ? _raw_spin_unlock_bh+0x4b/0x60 [ 128.055225][ T8447] ? kmsan_get_metadata+0x11d/0x180 [ 128.060402][ T8447] ? kmsan_set_origin_checked+0x95/0xf0 [ 128.065929][ T8447] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 128.071977][ T8447] ? kmsan_get_metadata+0x4f/0x180 [ 128.077083][ T8447] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 128.082870][ T8447] ? kmsan_get_metadata+0x11d/0x180 [ 128.088138][ T8447] ? kmsan_get_metadata+0x11d/0x180 [ 128.093319][ T8447] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 128.099111][ T8447] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 128.105268][ T8447] ? kmsan_get_metadata+0x4f/0x180 [ 128.110363][ T8447] ? kmsan_get_metadata+0x4f/0x180 [ 128.115455][ T8447] __se_compat_sys_sendmmsg+0xcd/0xf0 [ 128.120819][ T8447] ? __x32_compat_sys_sendmsg+0x70/0x70 [ 128.126346][ T8447] __ia32_compat_sys_sendmmsg+0x56/0x70 [ 128.131874][ T8447] __do_fast_syscall_32+0x2aa/0x400 [ 128.137059][ T8447] do_fast_syscall_32+0x6b/0xd0 [ 128.141915][ T8447] do_SYSENTER_32+0x73/0x90 [ 128.146420][ T8447] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 128.152724][ T8447] RIP: 0023:0xf7fbb549 [ 128.156781][ T8447] Code: Bad RIP value. [ 128.160829][ T8447] RSP: 002b:00000000ffa7189c EFLAGS: 00000286 ORIG_RAX: 0000000000000159 [ 128.169220][ T8447] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020001e00 [ 128.177274][ T8447] RDX: 00000000fffffe36 RSI: 0000000000000000 RDI: 0000000000000010 [ 128.185227][ T8447] RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000 [ 128.193178][ T8447] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 128.201147][ T8447] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 128.210451][ T8447] Kernel Offset: 0x10800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 128.222069][ T8447] Rebooting in 86400 seconds..