[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.107571] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.090180] random: sshd: uninitialized urandom read (32 bytes read) [ 23.493691] random: sshd: uninitialized urandom read (32 bytes read) [ 24.263869] random: sshd: uninitialized urandom read (32 bytes read) [ 32.431810] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.20' (ECDSA) to the list of known hosts. [ 37.849688] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 37.945406] WARNING: CPU: 0 PID: 4499 at mm/slab_common.c:996 kmalloc_slab+0x56/0x70 [ 37.953297] Kernel panic - not syncing: panic_on_warn set ... [ 37.953297] [ 37.960637] CPU: 0 PID: 4499 Comm: syz-executor050 Not tainted 4.17.0-rc3+ #9 [ 37.967883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.977211] Call Trace: [ 37.979779] dump_stack+0x1b9/0x294 [ 37.983386] ? dump_stack_print_info.cold.2+0x52/0x52 [ 37.988558] ? slab_caches_to_rcu_destroy_workfn+0x70/0xc0 [ 37.994165] panic+0x22f/0x4de [ 37.997337] ? add_taint.cold.5+0x16/0x16 [ 38.001464] ? __warn.cold.8+0x148/0x1b3 [ 38.005503] ? __warn.cold.8+0x117/0x1b3 [ 38.009543] ? kmalloc_slab+0x56/0x70 [ 38.013322] __warn.cold.8+0x163/0x1b3 [ 38.017186] ? kmalloc_slab+0x56/0x70 [ 38.020964] report_bug+0x252/0x2d0 [ 38.024567] do_error_trap+0x1de/0x490 [ 38.028432] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.033945] ? math_error+0x420/0x420 [ 38.037729] ? graph_lock+0x170/0x170 [ 38.041515] ? reverse_path_check_proc.cold.21+0x1f/0x1f [ 38.046944] ? get_unused_fd_flags+0x121/0x190 [ 38.051501] ? __alloc_fd+0x700/0x700 [ 38.055287] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.060715] do_invalid_op+0x1b/0x20 [ 38.064406] invalid_op+0x14/0x20 [ 38.067838] RIP: 0010:kmalloc_slab+0x56/0x70 [ 38.072218] RSP: 0018:ffff8801d907fc58 EFLAGS: 00010246 [ 38.077559] RAX: 0000000000000000 RBX: ffff8801aeecb280 RCX: ffffffff8185ebd7 [ 38.084811] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000ffffffe1 [ 38.092058] RBP: ffff8801d907fc58 R08: ffff8801adb5e1c0 R09: ffffed0035a84700 [ 38.099305] R10: ffffed0035a84700 R11: ffff8801ad423803 R12: ffff8801aeecb280 [ 38.106551] R13: 00000000fffffff4 R14: ffff8801ad891a00 R15: 00000000014200c0 [ 38.113806] ? map_get_next_key+0x227/0x640 [ 38.118111] __kmalloc+0x25/0x760 [ 38.121546] ? __might_sleep+0x95/0x190 [ 38.125495] ? map_get_next_key+0x24a/0x640 [ 38.129797] map_get_next_key+0x24a/0x640 [ 38.133925] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.139440] __x64_sys_bpf+0x354/0x4f0 [ 38.143302] ? bpf_prog_get+0x20/0x20 [ 38.147084] ? do_syscall_64+0x92/0x800 [ 38.151039] do_syscall_64+0x1b1/0x800 [ 38.154904] ? syscall_return_slowpath+0x5c0/0x5c0 [ 38.159811] ? syscall_return_slowpath+0x30f/0x5c0 [ 38.164717] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 38.170057] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.174877] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.180042] RIP: 0033:0x43fd89 [ 38.183209] RSP: 002b:00007ffd6aab4668 EFLAGS: 00000213 ORIG_RAX: 0000000000000141 [ 38.190899] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd89 [ 38.198146] RDX: 0000000000000007 RSI: 0000000020000040 RDI: 0000000000000004 [ 38.205389] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 38.212635] R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004016b0 [ 38.219879] R13: 0000000000401740 R14: 0000000000000000 R15: 0000000000000000 [ 38.227589] Dumping ftrace buffer: [ 38.231169] (ftrace buffer empty) [ 38.234857] Kernel Offset: disabled [ 38.238462] Rebooting in 86400 seconds..