[ 57.084161] sshd (4617) used greatest stack depth: 53592 bytes left [....] Starting OpenBSD Secure Shell server: sshd[ 57.288424] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 60.046223] random: sshd: uninitialized urandom read (32 bytes read) [ 60.543214] random: sshd: uninitialized urandom read (32 bytes read) [ 62.307882] random: sshd: uninitialized urandom read (32 bytes read) [ 62.716212] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 68.403746] random: sshd: uninitialized urandom read (32 bytes read) [ 68.636019] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 92.692533] ================================================================== [ 92.699962] BUG: KMSAN: uninit-value in memcmp+0x11d/0x180 [ 92.705611] CPU: 0 PID: 5708 Comm: syz-executor478 Not tainted 4.19.0-rc4+ #61 [ 92.712979] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 92.722326] Call Trace: [ 92.724936] dump_stack+0x2f6/0x430 [ 92.728573] kmsan_report+0x183/0x2b0 [ 92.732387] __msan_warning+0x70/0xc0 [ 92.736215] memcmp+0x11d/0x180 [ 92.739512] __dev_mc_del+0x169/0x6c0 [ 92.743340] dev_mc_del+0x6d/0x80 [ 92.746803] igmp6_group_dropped+0x2c5/0x12e0 [ 92.751314] ? __local_bh_enable_ip+0x37/0x150 [ 92.755912] ? _raw_write_unlock_bh+0x4b/0x57 [ 92.760407] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 92.765774] __ipv6_dev_mc_dec+0x6f1/0xbb0 [ 92.770055] __ipv6_ifa_notify+0x9c4/0x17c0 [ 92.774390] ? kmsan_set_origin_inline+0x6b/0x120 [ 92.779252] ? __msan_poison_alloca+0x17c/0x200 [ 92.783938] ? __local_bh_enable_ip+0x37/0x150 [ 92.788537] addrconf_ifdown+0x1813/0x2670 [ 92.792766] ? dev_forward_change+0xb70/0xb70 [ 92.797298] addrconf_notify+0x2c2/0x5d50 [ 92.801463] ? kmsan_set_origin_inline+0x6b/0x120 [ 92.806357] ? __msan_poison_alloca+0x17c/0x200 [ 92.811031] ? tls_dev_event+0xe8/0x17b0 [ 92.815085] ? raw_notifier_call_chain+0x13e/0x240 [ 92.820027] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 92.825443] ? tls_dev_event+0xd74/0x17b0 [ 92.829599] ? nf_ct_iterate_cleanup_net+0x24c/0x2c0 [ 92.834707] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 92.840065] ? ip6mr_device_event+0x35f/0x3d0 [ 92.844580] ? dev_forward_change+0xb70/0xb70 [ 92.849089] raw_notifier_call_chain+0x13e/0x240 [ 92.853912] dev_close_many+0x627/0x9e0 [ 92.857912] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 92.863324] rollback_registered_many+0x9eb/0x2040 [ 92.868310] ? __list_add_valid+0xb8/0x450 [ 92.872569] unregister_netdevice_queue+0x547/0xa40 [ 92.877591] __tun_detach+0x220c/0x2c70 [ 92.881594] tun_chr_close+0xda/0x1c0 [ 92.885427] ? tun_chr_open+0x750/0x750 [ 92.889403] __fput+0x4ee/0xe50 [ 92.892693] ____fput+0x37/0x40 [ 92.895965] ? fput+0x3c0/0x3c0 [ 92.899260] task_work_run+0x457/0x4d0 [ 92.903222] prepare_exit_to_usermode+0x33e/0x410 [ 92.908067] syscall_return_slowpath+0xf3/0x790 [ 92.912730] ? __close_fd+0x465/0x4c0 [ 92.916543] ? __se_sys_close+0x72/0x140 [ 92.920601] do_syscall_64+0xde/0x100 [ 92.924436] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 92.929622] RIP: 0033:0x400ff0 [ 92.932805] Code: 01 f0 ff ff 0f 83 b0 0a 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d dd 16 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 84 0a 00 00 c3 48 83 ec 08 e8 3a 01 00 00 [ 92.951704] RSP: 002b:00007ffc4982ac38 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 92.959409] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000400ff0 [ 92.966700] RDX: 00000000200000c0 RSI: 0000000000008914 RDI: 0000000000000005 [ 92.973960] RBP: 00000000000169d1 R08: 0000000000000000 R09: 0000000000000000 [ 92.981220] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 92.988497] R13: 0000000000401f90 R14: 0000000000000000 R15: 0000000000000000 [ 92.995768] [ 92.997392] Local variable description: ----buf@igmp6_group_dropped [ 93.003794] Variable was created at: [ 93.007499] igmp6_group_dropped+0x49/0x12e0 [ 93.011911] __ipv6_dev_mc_dec+0x6f1/0xbb0 [ 93.016128] ================================================================== [ 93.023478] Disabling lock debugging due to kernel taint [ 93.028928] Kernel panic - not syncing: panic_on_warn set ... [ 93.028928] [ 93.036304] CPU: 0 PID: 5708 Comm: syz-executor478 Tainted: G B 4.19.0-rc4+ #61 [ 93.045059] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 93.054404] Call Trace: [ 93.056993] dump_stack+0x2f6/0x430 [ 93.060629] panic+0x54c/0xaf7 [ 93.063873] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 93.069342] kmsan_report+0x2a8/0x2b0 [ 93.073175] __msan_warning+0x70/0xc0 [ 93.077007] memcmp+0x11d/0x180 [ 93.080308] __dev_mc_del+0x169/0x6c0 [ 93.084175] dev_mc_del+0x6d/0x80 [ 93.087632] igmp6_group_dropped+0x2c5/0x12e0 [ 93.092177] ? __local_bh_enable_ip+0x37/0x150 [ 93.096790] ? _raw_write_unlock_bh+0x4b/0x57 [ 93.101330] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 93.106720] __ipv6_dev_mc_dec+0x6f1/0xbb0 [ 93.111071] __ipv6_ifa_notify+0x9c4/0x17c0 [ 93.115406] ? kmsan_set_origin_inline+0x6b/0x120 [ 93.120248] ? __msan_poison_alloca+0x17c/0x200 [ 93.124926] ? __local_bh_enable_ip+0x37/0x150 [ 93.129518] addrconf_ifdown+0x1813/0x2670 [ 93.133745] ? dev_forward_change+0xb70/0xb70 [ 93.138291] addrconf_notify+0x2c2/0x5d50 [ 93.142451] ? kmsan_set_origin_inline+0x6b/0x120 [ 93.147321] ? __msan_poison_alloca+0x17c/0x200 [ 93.152017] ? tls_dev_event+0xe8/0x17b0 [ 93.156084] ? raw_notifier_call_chain+0x13e/0x240 [ 93.161027] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 93.166388] ? tls_dev_event+0xd74/0x17b0 [ 93.170534] ? nf_ct_iterate_cleanup_net+0x24c/0x2c0 [ 93.175646] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 93.181003] ? ip6mr_device_event+0x35f/0x3d0 [ 93.185519] ? dev_forward_change+0xb70/0xb70 [ 93.190029] raw_notifier_call_chain+0x13e/0x240 [ 93.194786] dev_close_many+0x627/0x9e0 [ 93.198772] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 93.204146] rollback_registered_many+0x9eb/0x2040 [ 93.209112] ? __list_add_valid+0xb8/0x450 [ 93.213371] unregister_netdevice_queue+0x547/0xa40 [ 93.218399] __tun_detach+0x220c/0x2c70 [ 93.222419] tun_chr_close+0xda/0x1c0 [ 93.226229] ? tun_chr_open+0x750/0x750 [ 93.230196] __fput+0x4ee/0xe50 [ 93.233491] ____fput+0x37/0x40 [ 93.236762] ? fput+0x3c0/0x3c0 [ 93.240074] task_work_run+0x457/0x4d0 [ 93.244004] prepare_exit_to_usermode+0x33e/0x410 [ 93.248848] syscall_return_slowpath+0xf3/0x790 [ 93.253514] ? __close_fd+0x465/0x4c0 [ 93.257339] ? __se_sys_close+0x72/0x140 [ 93.261429] do_syscall_64+0xde/0x100 [ 93.265227] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 93.270435] RIP: 0033:0x400ff0 [ 93.273625] Code: 01 f0 ff ff 0f 83 b0 0a 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d dd 16 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 84 0a 00 00 c3 48 83 ec 08 e8 3a 01 00 00 [ 93.292521] RSP: 002b:00007ffc4982ac38 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 93.300233] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000400ff0 [ 93.307511] RDX: 00000000200000c0 RSI: 0000000000008914 RDI: 0000000000000005 [ 93.314770] RBP: 00000000000169d1 R08: 0000000000000000 R09: 0000000000000000 [ 93.322032] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 93.329299] R13: 0000000000401f90 R14: 0000000000000000 R15: 0000000000000000 [ 93.336932] Kernel Offset: disabled [ 93.340564] Rebooting in 86400 seconds..