[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 25.313818] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.307686] random: sshd: uninitialized urandom read (32 bytes read) [ 28.762301] random: sshd: uninitialized urandom read (32 bytes read) [ 29.380554] random: sshd: uninitialized urandom read (32 bytes read) [ 29.603799] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts. [ 35.165728] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.284787] WARNING: CPU: 1 PID: 5328 at mm/slab_common.c:1031 kmalloc_slab+0x56/0x70 [ 35.293045] Kernel panic - not syncing: panic_on_warn set ... [ 35.293045] [ 35.300547] CPU: 1 PID: 5328 Comm: syz-executor455 Not tainted 4.19.0-rc4+ #248 [ 35.307996] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.317350] Call Trace: [ 35.320019] dump_stack+0x1c4/0x2b4 [ 35.323648] ? dump_stack_print_info.cold.2+0x52/0x52 [ 35.328864] panic+0x238/0x4e7 [ 35.332058] ? add_taint.cold.5+0x16/0x16 [ 35.336206] ? __warn.cold.8+0x148/0x1ba [ 35.340279] ? __warn.cold.8+0x117/0x1ba [ 35.344585] ? kmalloc_slab+0x56/0x70 [ 35.348388] __warn.cold.8+0x163/0x1ba [ 35.352278] ? rcu_bh_qs+0xc0/0xc0 [ 35.355949] ? kmalloc_slab+0x56/0x70 [ 35.359755] report_bug+0x254/0x2d0 [ 35.363501] do_error_trap+0x1fc/0x4d0 [ 35.367384] ? find_held_lock+0x36/0x1c0 [ 35.371443] ? math_error+0x3f0/0x3f0 [ 35.375250] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.380099] ? trace_hardirqs_on_caller+0x310/0x310 [ 35.385124] ? lock_downgrade+0x900/0x900 [ 35.389276] ? __kasan_slab_free+0x102/0x150 [ 35.393688] ? kasan_slab_free+0xe/0x10 [ 35.397792] ? kfree+0xcf/0x230 [ 35.401080] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.405928] do_invalid_op+0x1b/0x20 [ 35.409646] invalid_op+0x14/0x20 [ 35.413104] RIP: 0010:kmalloc_slab+0x56/0x70 [ 35.417516] 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 [ 35.436424] RSP: 0018:ffff8801d935f978 EFLAGS: 00010246 [ 35.441790] RAX: 0000000000000000 RBX: 00000000fffffffd RCX: ffffffff8534b947 [ 35.449057] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000003fffffff60 [ 35.456369] RBP: ffff8801d935f978 R08: ffff8801bcb20140 R09: ffffed003b248db9 [ 35.463639] R10: ffff8801d935fa48 R11: ffff8801d9246dcf R12: 0000000000000000 [ 35.471054] R13: 0000000000000000 R14: ffff8801d9268300 R15: 00000000006080c0 [ 35.478390] ? input_mt_init_slots+0x27/0x4a0 [ 35.482959] ? kfree+0x107/0x230 [ 35.486326] __kmalloc+0x25/0x760 [ 35.489784] ? trace_hardirqs_on+0xbd/0x310 [ 35.494193] ? input_mt_init_slots+0xe5/0x4a0 [ 35.498691] input_mt_init_slots+0xe5/0x4a0 [ 35.503076] uinput_ioctl_handler.isra.10+0x2049/0x2540 [ 35.508533] ? uinput_request_submit.part.9+0x2d0/0x2d0 [ 35.513912] ? __kasan_slab_free+0x102/0x150 [ 35.518330] ? uinput_dev_erase_effect+0x200/0x200 [ 35.523267] ? trace_hardirqs_off+0xb8/0x310 [ 35.527682] ? kasan_check_read+0x11/0x20 [ 35.531869] ? __vfs_write+0x121/0x9f0 [ 35.535763] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 35.540698] ? uinput_dev_erase_effect+0x200/0x200 [ 35.545694] uinput_ioctl+0x4c/0x60 [ 35.549326] ? uinput_compat_ioctl+0x90/0x90 [ 35.553737] do_vfs_ioctl+0x1de/0x1720 [ 35.557633] ? fsnotify_first_mark+0x350/0x350 [ 35.562223] ? ioctl_preallocate+0x300/0x300 [ 35.566636] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.572175] ? __fget_light+0x2e9/0x430 [ 35.576150] ? fget_raw+0x20/0x20 [ 35.579607] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 35.585158] ? do_syscall_64+0x9a/0x820 [ 35.589135] ? do_syscall_64+0x9a/0x820 [ 35.593111] ? lockdep_hardirqs_on+0x421/0x5c0 [ 35.597695] ? security_file_ioctl+0x94/0xc0 [ 35.602154] ksys_ioctl+0xa9/0xd0 [ 35.605612] __x64_sys_ioctl+0x73/0xb0 [ 35.609510] do_syscall_64+0x1b9/0x820 [ 35.613404] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 35.618777] ? syscall_return_slowpath+0x5e0/0x5e0 [ 35.623711] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.628556] ? trace_hardirqs_on_caller+0x310/0x310 [ 35.633574] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 35.638650] ? prepare_exit_to_usermode+0x291/0x3b0 [ 35.643672] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.648668] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.653920] RIP: 0033:0x441859 [ 35.657121] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 35.676080] RSP: 002b:00007ffc2d1ab438 EFLAGS: 00000286 ORIG_RAX: 0000000000000010 [ 35.683923] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441859 [ 35.691200] RDX: 0000000000441859 RSI: 0000000000005501 RDI: 0000000000000003 [ 35.698720] RBP: 0000000000000000 R08: 00007ffc2d1ab5b8 R09: 00007ffc2d1ab5b8 [ 35.705993] R10: 00007ffc2d1ab5b8 R11: 0000000000000286 R12: 0000000000000000 [ 35.713264] R13: 0000000000000000 R14: 0000000000000000 R15: 00000000307a7973 [ 35.722013] Kernel Offset: disabled [ 35.725779] Rebooting in 86400 seconds..