[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 30.898552] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 34.254891] random: sshd: uninitialized urandom read (32 bytes read) [ 34.641792] random: sshd: uninitialized urandom read (32 bytes read) [ 36.303348] random: sshd: uninitialized urandom read (32 bytes read) [ 36.512963] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 42.026085] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 42.135731] ================================================================== [ 42.143139] BUG: KMSAN: uninit-value in ebt_stp_mt_check+0x24b/0x450 [ 42.149613] CPU: 1 PID: 4523 Comm: syz-executor710 Not tainted 4.17.0+ #3 [ 42.156515] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.165849] Call Trace: [ 42.168424] dump_stack+0x185/0x1d0 [ 42.172041] ? ebt_stp_mt_check+0x24b/0x450 [ 42.176351] kmsan_report+0x149/0x260 [ 42.180131] __msan_warning_32+0x6e/0xc0 [ 42.184170] ebt_stp_mt_check+0x24b/0x450 [ 42.188296] ? ebt_stp_mt+0x24c0/0x24c0 [ 42.192256] xt_check_match+0x1438/0x1650 [ 42.196386] ? mutex_unlock+0x15/0x80 [ 42.200169] ? xt_find_match+0x444/0x550 [ 42.204218] translate_table+0x4e88/0x6120 [ 42.208454] ? __msan_poison_alloca+0x15c/0x1d0 [ 42.213112] do_replace_finish+0x1258/0x2ea0 [ 42.217506] do_replace+0x719/0x780 [ 42.221113] do_ebt_set_ctl+0x2ab/0x3c0 [ 42.225077] ? nf_setsockopt+0x16f/0x4e0 [ 42.229127] ? try_module_get+0x61/0x3d0 [ 42.233182] ? nf_setsockopt+0x16f/0x4e0 [ 42.237223] ? nf_setsockopt+0x16f/0x4e0 [ 42.241263] ? ebt_cleanup_entry+0xad0/0xad0 [ 42.245651] nf_setsockopt+0x47c/0x4e0 [ 42.249518] ip_setsockopt+0x24b/0x2b0 [ 42.253394] udp_setsockopt+0x108/0x1b0 [ 42.257353] ? udp_lib_setsockopt+0xb00/0xb00 [ 42.261849] sock_common_setsockopt+0x13b/0x170 [ 42.266514] ? sock_common_recvmsg+0x280/0x280 [ 42.271086] __sys_setsockopt+0x496/0x540 [ 42.275223] __x64_sys_setsockopt+0x15c/0x1c0 [ 42.279720] ? __ia32_sys_recv+0x180/0x180 [ 42.283934] do_syscall_64+0x15b/0x230 [ 42.287816] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.293009] RIP: 0033:0x43fd89 [ 42.296191] RSP: 002b:00007ffc9d7edb28 EFLAGS: 00000213 ORIG_RAX: 0000000000000036 [ 42.303902] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd89 [ 42.311170] RDX: 0000000000000080 RSI: 0000000000000000 RDI: 0000000000000003 [ 42.318423] RBP: 00000000006ca018 R08: 0000000000000300 R09: 00000000004002c8 [ 42.325673] R10: 0000000020000480 R11: 0000000000000213 R12: 00000000004016b0 [ 42.332930] R13: 0000000000401740 R14: 0000000000000000 R15: 0000000000000000 [ 42.340201] [ 42.341808] Local variable description: ----mtpar.i@translate_table [ 42.348188] Variable was created at: [ 42.351892] translate_table+0xbb/0x6120 [ 42.355937] do_replace_finish+0x1258/0x2ea0 [ 42.360330] ================================================================== [ 42.367668] Disabling lock debugging due to kernel taint [ 42.373103] Kernel panic - not syncing: panic_on_warn set ... [ 42.373103] [ 42.380467] CPU: 1 PID: 4523 Comm: syz-executor710 Tainted: G B 4.17.0+ #3 [ 42.388759] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.398107] Call Trace: [ 42.400689] dump_stack+0x185/0x1d0 [ 42.404296] panic+0x3d0/0x990 [ 42.407473] ? ebt_stp_mt_check+0x24b/0x450 [ 42.411772] kmsan_report+0x260/0x260 [ 42.415552] __msan_warning_32+0x6e/0xc0 [ 42.419590] ebt_stp_mt_check+0x24b/0x450 [ 42.423716] ? ebt_stp_mt+0x24c0/0x24c0 [ 42.427672] xt_check_match+0x1438/0x1650 [ 42.431801] ? mutex_unlock+0x15/0x80 [ 42.435586] ? xt_find_match+0x444/0x550 [ 42.439645] translate_table+0x4e88/0x6120 [ 42.443877] ? __msan_poison_alloca+0x15c/0x1d0 [ 42.448544] do_replace_finish+0x1258/0x2ea0 [ 42.452939] do_replace+0x719/0x780 [ 42.456555] do_ebt_set_ctl+0x2ab/0x3c0 [ 42.460510] ? nf_setsockopt+0x16f/0x4e0 [ 42.464551] ? try_module_get+0x61/0x3d0 [ 42.468601] ? nf_setsockopt+0x16f/0x4e0 [ 42.472640] ? nf_setsockopt+0x16f/0x4e0 [ 42.476680] ? ebt_cleanup_entry+0xad0/0xad0 [ 42.481070] nf_setsockopt+0x47c/0x4e0 [ 42.484939] ip_setsockopt+0x24b/0x2b0 [ 42.488805] udp_setsockopt+0x108/0x1b0 [ 42.492760] ? udp_lib_setsockopt+0xb00/0xb00 [ 42.497233] sock_common_setsockopt+0x13b/0x170 [ 42.501882] ? sock_common_recvmsg+0x280/0x280 [ 42.506443] __sys_setsockopt+0x496/0x540 [ 42.510570] __x64_sys_setsockopt+0x15c/0x1c0 [ 42.515053] ? __ia32_sys_recv+0x180/0x180 [ 42.519277] do_syscall_64+0x15b/0x230 [ 42.523147] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.528313] RIP: 0033:0x43fd89 [ 42.531482] RSP: 002b:00007ffc9d7edb28 EFLAGS: 00000213 ORIG_RAX: 0000000000000036 [ 42.539181] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd89 [ 42.546433] RDX: 0000000000000080 RSI: 0000000000000000 RDI: 0000000000000003 [ 42.553682] RBP: 00000000006ca018 R08: 0000000000000300 R09: 00000000004002c8 [ 42.560935] R10: 0000000020000480 R11: 0000000000000213 R12: 00000000004016b0 [ 42.568187] R13: 0000000000401740 R14: 0000000000000000 R15: 0000000000000000 [ 42.575903] Dumping ftrace buffer: [ 42.579426] (ftrace buffer empty) [ 42.583116] Kernel Offset: disabled [ 42.586721] Rebooting in 86400 seconds..