[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 25.177356] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.970560] random: sshd: uninitialized urandom read (32 bytes read) [ 30.461396] random: sshd: uninitialized urandom read (32 bytes read) [ 31.021455] random: sshd: uninitialized urandom read (32 bytes read) [ 31.223818] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 36.772810] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.901312] WARNING: CPU: 0 PID: 5324 at mm/slab_common.c:1031 kmalloc_slab+0x56/0x70 [ 36.909354] Kernel panic - not syncing: panic_on_warn set ... [ 36.909354] [ 36.916704] CPU: 0 PID: 5324 Comm: syz-executor246 Not tainted 4.19.0-rc4+ #151 [ 36.924153] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.933491] Call Trace: [ 36.936063] dump_stack+0x1c4/0x2b4 [ 36.939679] ? dump_stack_print_info.cold.2+0x52/0x52 [ 36.944863] panic+0x238/0x4e7 [ 36.948041] ? add_taint.cold.5+0x16/0x16 [ 36.952179] ? __warn.cold.8+0x148/0x1ba [ 36.956239] ? __warn.cold.8+0x117/0x1ba [ 36.960311] ? kmalloc_slab+0x56/0x70 [ 36.964099] __warn.cold.8+0x163/0x1ba [ 36.967972] ? rcu_bh_qs+0xc0/0xc0 [ 36.971500] ? kmalloc_slab+0x56/0x70 [ 36.975285] report_bug+0x254/0x2d0 [ 36.978903] do_error_trap+0x1fc/0x4d0 [ 36.982776] ? math_error+0x3f0/0x3f0 [ 36.986563] ? kfree+0x107/0x230 [ 36.989920] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.994752] ? trace_hardirqs_on_caller+0x310/0x310 [ 36.999755] ? trace_hardirqs_on+0xbd/0x310 [ 37.004065] ? uinput_write+0x816/0x1130 [ 37.008115] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.012943] do_invalid_op+0x1b/0x20 [ 37.016641] invalid_op+0x14/0x20 [ 37.020083] RIP: 0010:kmalloc_slab+0x56/0x70 [ 37.024477] Code: c5 40 2b 17 89 5d c3 48 85 ff b8 10 00 00 00 74 f4 83 ef 01 c1 ef 03 0f b6 87 60 2a 17 89 eb d8 31 c0 81 e6 00 02 00 00 75 db <0f> 0b 5d c3 48 8b 04 c5 80 2a 17 89 5d c3 66 90 66 2e 0f 1f 84 00 [ 37.043366] RSP: 0018:ffff8801c09a7ad8 EFLAGS: 00010246 [ 37.048726] RAX: 0000000000000000 RBX: 00000000fffffffd RCX: ffffffff8534b947 [ 37.055984] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000003fffffff60 [ 37.063241] RBP: ffff8801c09a7ad8 R08: ffff8801d9596340 R09: ffffed0039c4a5b1 [ 37.070496] R10: ffff8801c09a7ba8 R11: ffff8801ce252d8f R12: 0000000000000000 [ 37.077753] R13: 0000000000000000 R14: ffff8801d94fb340 R15: 00000000006080c0 [ 37.085035] ? input_mt_init_slots+0x27/0x4a0 [ 37.089534] __kmalloc+0x25/0x760 [ 37.092975] ? input_mt_init_slots+0xe5/0x4a0 [ 37.097462] input_mt_init_slots+0xe5/0x4a0 [ 37.101773] uinput_ioctl_handler.isra.10+0x2049/0x2540 [ 37.107122] ? uinput_request_submit.part.9+0x2d0/0x2d0 [ 37.112475] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.118013] ? __fget_light+0x2e9/0x430 [ 37.121975] ? fget_raw+0x20/0x20 [ 37.125413] ? rw_verify_area+0x118/0x360 [ 37.129548] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 37.135073] ? vfs_write+0x2ad/0x560 [ 37.138778] ? do_fast_syscall_32+0x150/0xfb2 [ 37.143272] ? lockdep_hardirqs_on+0x421/0x5c0 [ 37.147843] ? uinput_ioctl_handler.isra.10+0x2540/0x2540 [ 37.153368] uinput_compat_ioctl+0x6b/0x90 [ 37.157591] __ia32_compat_sys_ioctl+0x20e/0x630 [ 37.162339] do_fast_syscall_32+0x34d/0xfb2 [ 37.166650] ? do_int80_syscall_32+0x890/0x890 [ 37.171225] ? entry_SYSENTER_compat+0x68/0x7f [ 37.175799] ? trace_hardirqs_off_caller+0xbb/0x310 [ 37.180798] ? syscall_return_slowpath+0x5e0/0x5e0 [ 37.185714] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.190547] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.195377] ? trace_hardirqs_on_caller+0x310/0x310 [ 37.200384] ? prepare_exit_to_usermode+0x291/0x3b0 [ 37.205389] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.210232] entry_SYSENTER_compat+0x70/0x7f [ 37.214625] RIP: 0023:0xf7f33ca9 [ 37.217981] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 37.236882] RSP: 002b:00000000ff9bb7ec EFLAGS: 00000282 ORIG_RAX: 0000000000000036 [ 37.244578] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000005501 [ 37.251840] RDX: 0000000000000003 RSI: 00000000080eb00c RDI: 000000000000003f [ 37.259095] RBP: 00000000ff9bb850 R08: 0000000000000000 R09: 0000000000000000 [ 37.266347] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 37.273604] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 37.281926] Kernel Offset: disabled [ 37.285616] Rebooting in 86400 seconds..