[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.664345] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.774379] random: sshd: uninitialized urandom read (32 bytes read) [ 19.997945] random: sshd: uninitialized urandom read (32 bytes read) [ 20.800191] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.960067] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts. [ 26.408850] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.499382] WARNING: CPU: 0 PID: 4531 at mm/slab_common.c:996 kmalloc_slab+0x56/0x70 [ 26.507292] Kernel panic - not syncing: panic_on_warn set ... [ 26.507292] [ 26.514646] CPU: 0 PID: 4531 Comm: syz-executor594 Not tainted 4.17.0-rc3+ #9 [ 26.521901] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.531237] Call Trace: [ 26.533814] dump_stack+0x1b9/0x294 [ 26.537427] ? dump_stack_print_info.cold.2+0x52/0x52 [ 26.542640] ? slab_caches_to_rcu_destroy_workfn+0x70/0xc0 [ 26.548252] panic+0x22f/0x4de [ 26.551433] ? add_taint.cold.5+0x16/0x16 [ 26.555568] ? __warn.cold.8+0x148/0x1b3 [ 26.559618] ? __warn.cold.8+0x117/0x1b3 [ 26.563667] ? kmalloc_slab+0x56/0x70 [ 26.567449] __warn.cold.8+0x163/0x1b3 [ 26.571320] ? kmalloc_slab+0x56/0x70 [ 26.575107] report_bug+0x252/0x2d0 [ 26.578720] do_error_trap+0x1de/0x490 [ 26.582591] ? math_error+0x420/0x420 [ 26.586374] ? graph_lock+0x170/0x170 [ 26.590162] ? reverse_path_check_proc.cold.21+0x1f/0x1f [ 26.595603] ? get_unused_fd_flags+0x121/0x190 [ 26.600169] ? __alloc_fd+0x700/0x700 [ 26.603973] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.608799] do_invalid_op+0x1b/0x20 [ 26.612512] invalid_op+0x14/0x20 [ 26.615959] RIP: 0010:kmalloc_slab+0x56/0x70 [ 26.620344] RSP: 0018:ffff8801ad4b7c48 EFLAGS: 00010246 [ 26.625697] RAX: 0000000000000000 RBX: fffffffffffffff4 RCX: ffffffff8185e678 [ 26.632960] RDX: ffffffff8185e6eb RSI: 0000000000000000 RDI: 00000000fffffffd [ 26.640221] RBP: ffff8801ad4b7c48 R08: ffff8801adb3e2c0 R09: ffffed0035ba1f08 [ 26.647486] R10: ffffed0035ba1f08 R11: ffff8801add0f843 R12: 00000000fffffffd [ 26.654740] R13: 0000000020000240 R14: 00000000ffffffff R15: 00000000014200c0 [ 26.662015] ? map_delete_elem+0x1a8/0x4e0 [ 26.666248] ? map_delete_elem+0x21b/0x4e0 [ 26.670479] __kmalloc_track_caller+0x21/0x760 [ 26.675047] ? __might_sleep+0x95/0x190 [ 26.679003] ? map_delete_elem+0x21b/0x4e0 [ 26.683229] memdup_user+0x2c/0xa0 [ 26.686754] map_delete_elem+0x21b/0x4e0 [ 26.690802] __x64_sys_bpf+0x33f/0x4f0 [ 26.694672] ? bpf_prog_get+0x20/0x20 [ 26.698460] ? do_syscall_64+0x92/0x800 [ 26.702431] do_syscall_64+0x1b1/0x800 [ 26.706302] ? syscall_return_slowpath+0x5c0/0x5c0 [ 26.711215] ? syscall_return_slowpath+0x30f/0x5c0 [ 26.716131] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 26.721486] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.726324] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.731494] RIP: 0033:0x43fd89 [ 26.734667] RSP: 002b:00007ffe3ad9ad78 EFLAGS: 00000213 ORIG_RAX: 0000000000000141 [ 26.742363] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd89 [ 26.749612] RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003 [ 26.756862] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 26.764117] R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004016b0 [ 26.771379] R13: 0000000000401740 R14: 0000000000000000 R15: 0000000000000000 [ 26.779302] Dumping ftrace buffer: [ 26.782927] (ftrace buffer empty) [ 26.786622] Kernel Offset: disabled [ 26.790234] Rebooting in 86400 seconds..