[....] Starting OpenBSD Secure Shell server: sshd[ 16.886240] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 17.082380] random: sshd: uninitialized urandom read (32 bytes read) [ 17.351894] random: sshd: uninitialized urandom read (32 bytes read) [ 17.917114] urandom_read: 1 callbacks suppressed [ 17.917119] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. syzkaller login: [ 23.352267] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.451842] kasan: CONFIG_KASAN_INLINE enabled [ 23.456448] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 23.463817] general protection fault: 0000 [#1] SMP KASAN [ 23.469348] CPU: 0 PID: 4362 Comm: syz-executor805 Not tainted 4.18.0-rc8-next-20180807+ #33 [ 23.477924] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.487281] RIP: 0010:__schedule+0x1061/0x1ec0 [ 23.491983] Code: 4c 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 ea 08 00 00 4d 8b 6d 00 4d 85 ed 0f 84 6b f6 ff ff 49 8d 7d 10 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 a6 e8 43 28 04 fb eb 9f 4c 89 e6 48 89 df e8 e6 [ 23.510876] RSP: 0018:ffff8801b4626a80 EFLAGS: 00010806 [ 23.516236] RAX: 1bd5a00000000022 RBX: ffff8801a7c0e340 RCX: 1ffff10035c3b88f [ 23.523496] RDX: 0000000040000000 RSI: 0000000000000000 RDI: dead000000000110 [ 23.530761] RBP: ffff8801b4626c50 R08: ffff8801a7c0e340 R09: fffff520003c3a47 [ 23.538031] R10: fffff520003c3a47 R11: ffffc90001e1d23b R12: ffff8801af68a700 [ 23.545304] R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801db02ca40 [ 23.552581] FS: 0000000000b61880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 [ 23.560795] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.566666] CR2: 00007f8723e62000 CR3: 00000001c2c4c000 CR4: 00000000001426f0 [ 23.573926] Call Trace: [ 23.576509] ? trace_hardirqs_on+0x10/0x10 [ 23.580744] ? __sched_text_start+0x8/0x8 [ 23.584891] ? generic_exec_single+0x1ea/0x5e0 [ 23.589475] ? add_nops+0x90/0x90 [ 23.592944] ? smp_call_on_cpu+0x540/0x540 [ 23.597172] ? retint_kernel+0x10/0x10 [ 23.601059] ? smp_call_function_single+0x43c/0x5c0 [ 23.606078] ? smp_call_function_single+0x3eb/0x5c0 [ 23.611102] ? check_same_owner+0x340/0x340 [ 23.615423] ? smp_call_function_single+0x2d6/0x5c0 [ 23.620442] ? add_nops+0x90/0x90 [ 23.623894] ? arch_jump_label_transform+0x1b/0x40 [ 23.628821] preempt_schedule_common+0x22/0x60 [ 23.633403] _cond_resched+0x1d/0x30 [ 23.637119] __mutex_lock+0x13d/0x1700 [ 23.641018] ? fill_pte+0xd6/0x420 [ 23.644606] ? arch_jump_label_transform+0x1b/0x40 [ 23.649554] ? mutex_trylock+0x2b0/0x2b0 [ 23.653629] ? smp_call_function_many+0x123/0xa40 [ 23.658499] ? __native_set_fixmap+0x49/0x60 [ 23.662916] ? arch_jump_label_transform+0x3b/0x40 [ 23.667846] ? lock_downgrade+0x8f0/0x8f0 [ 23.671996] ? smp_call_function_single_async+0x340/0x340 [ 23.677537] ? __native_set_fixmap+0x60/0x60 [ 23.681939] ? trace_hardirqs_on+0xd/0x10 [ 23.686094] ? vmx_vcpu_reset+0x8cd/0x1080 [ 23.690323] ? do_sync_core+0x18/0x20 [ 23.694115] ? trace_hardirqs_on+0xd/0x10 [ 23.698260] ? kasan_check_write+0x14/0x20 [ 23.702516] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 23.707447] ? wait_for_completion+0x8d0/0x8d0 [ 23.712067] ? vmx_vcpu_reset+0x8cd/0x1080 [ 23.716306] ? __jump_label_transform.isra.0+0x478/0x8f0 [ 23.721780] ? modules_open+0xa0/0xa0 [ 23.725583] ? kvm_vm_release+0x42/0x50 [ 23.729556] ? get_trap_addr+0x1d0/0x1d0 [ 23.733616] ? do_group_exit+0x177/0x440 [ 23.737683] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 23.743242] ? jump_label_type+0x132/0x1d0 [ 23.747481] ? static_key_count+0x130/0x130 [ 23.751835] mutex_lock_nested+0x16/0x20 [ 23.755892] ? mutex_lock_nested+0x16/0x20 [ 23.760123] arch_jump_label_transform+0x1b/0x40 [ 23.764875] __jump_label_update+0x16e/0x1a0 [ 23.769283] jump_label_update+0x151/0x2e0 [ 23.773518] __static_key_slow_dec_cpuslocked+0xb8/0x210 [ 23.778966] ? static_key_disable+0x30/0x30 [ 23.783293] static_key_slow_dec+0x63/0xa0 [ 23.787527] kvm_arch_vcpu_uninit+0x18e/0x1d0 [ 23.792037] kvm_vcpu_uninit+0x44/0x90 [ 23.795985] vmx_free_vcpu+0x23a/0x300 [ 23.799872] kvm_arch_destroy_vm+0x365/0x7c0 [ 23.804278] ? kasan_check_read+0x13/0x20 [ 23.808421] ? kvm_arch_sync_events+0x30/0x30 [ 23.812916] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 23.818451] ? mmu_notifier_unregister+0x474/0x600 [ 23.823376] ? debug_check_no_obj_freed+0x30b/0x595 [ 23.828390] ? __mmu_notifier_register+0x30/0x30 [ 23.833147] ? __free_pages+0x10a/0x190 [ 23.837119] ? free_unref_page+0x9a0/0x9a0 [ 23.841389] kvm_put_kvm+0x73f/0x1060 [ 23.845198] ? kvm_write_guest_cached+0x40/0x40 [ 23.849871] ? lock_acquire+0x1e4/0x540 [ 23.853850] ? kvm_irqfd_release+0xd1/0x120 [ 23.858175] ? lock_downgrade+0x8f0/0x8f0 [ 23.862335] ? kasan_check_write+0x14/0x20 [ 23.866570] ? do_raw_spin_lock+0xc1/0x200 [ 23.870802] ? kvm_irqfd_release+0xdd/0x120 [ 23.875126] ? kvm_put_kvm+0x1060/0x1060 [ 23.879184] kvm_vm_release+0x42/0x50 [ 23.882992] __fput+0x376/0x8a0 [ 23.886273] ? __alloc_file+0x400/0x400 [ 23.890243] ? check_same_owner+0x340/0x340 [ 23.894557] ? kasan_check_write+0x14/0x20 [ 23.898801] ? do_raw_spin_lock+0xc1/0x200 [ 23.903038] ____fput+0x15/0x20 [ 23.906319] task_work_run+0x1e8/0x2a0 [ 23.910204] ? task_work_cancel+0x240/0x240 [ 23.914525] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 23.920060] ? switch_task_namespaces+0xa2/0xd0 [ 23.924727] do_exit+0x1b25/0x2760 [ 23.928265] ? mm_update_next_owner+0x9a0/0x9a0 [ 23.932924] ? kvm_dev_ioctl+0x18a/0x1b10 [ 23.937068] ? is_bpf_text_address+0xae/0x170 [ 23.941562] ? kfree+0x15e/0x260 [ 23.944922] ? kvm_vcpu_ioctl+0x2ba/0x1300 [ 23.949152] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 23.954855] ? is_bpf_text_address+0xd7/0x170 [ 23.959353] ? kernel_text_address+0x79/0xf0 [ 23.963778] ? __kernel_text_address+0xd/0x40 [ 23.968267] ? unwind_get_return_address+0x61/0xa0 [ 23.973197] ? __save_stack_trace+0x8d/0xf0 [ 23.977517] ? save_stack+0xa9/0xd0 [ 23.981133] ? save_stack+0x43/0xd0 [ 23.984762] ? __kasan_slab_free+0x11a/0x170 [ 23.989162] ? kasan_slab_free+0xe/0x10 [ 23.993144] ? putname+0xf2/0x130 [ 23.996591] ? __x64_sys_openat+0x9d/0x100 [ 24.000820] ? do_syscall_64+0x1b9/0x820 [ 24.004890] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 24.010246] ? kasan_check_read+0x11/0x20 [ 24.014383] ? do_raw_spin_unlock+0xa7/0x2f0 [ 24.018788] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 24.023366] ? initcall_blacklisted+0x9a/0x1e0 [ 24.027943] ? do_raw_spin_lock+0xc1/0x200 [ 24.032170] ? trace_hardirqs_off+0xd/0x10 [ 24.036396] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 24.041495] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 24.047209] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 24.052742] ? do_vfs_ioctl+0x201/0x1720 [ 24.056814] ? ioctl_preallocate+0x300/0x300 [ 24.061216] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 24.066745] ? __fget_light+0x2f7/0x440 [ 24.070711] ? fget_raw+0x20/0x20 [ 24.074156] ? trace_hardirqs_on+0xd/0x10 [ 24.078308] ? kmem_cache_free+0x22e/0x2d0 [ 24.082551] ? putname+0xf7/0x130 [ 24.085997] do_group_exit+0x177/0x440 [ 24.089882] ? __ia32_sys_exit+0x50/0x50 [ 24.093938] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 24.099466] ? ksys_ioctl+0x81/0xd0 [ 24.103092] __x64_sys_exit_group+0x3e/0x50 [ 24.107411] do_syscall_64+0x1b9/0x820 [ 24.111294] ? syscall_return_slowpath+0x5e0/0x5e0 [ 24.116219] ? syscall_return_slowpath+0x31d/0x5e0 [ 24.121147] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 24.126159] ? prepare_exit_to_usermode+0x291/0x3b0 [ 24.131172] ? perf_trace_sys_enter+0xb10/0xb10 [ 24.135833] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.140688] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 24.145868] RIP: 0033:0x442e88 [ 24.149057] Code: Bad RIP value. [ 24.152413] RSP: 002b:00007ffc1bfa5048 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 24.160128] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442e88 [ 24.167389] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 24.174652] RBP: 00000000004c2d08 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 24.181914] R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000000001 [ 24.189177] R13: 00000000006d5180 R14: 0000000000000000 R15: 0000000000000000 [ 24.196444] Modules linked in: [ 24.199634] Dumping ftrace buffer: [ 24.203159] (ftrace buffer empty) [ 24.206882] ---[ end trace e505c634f85b0b3c ]--- [ 24.211635] RIP: 0010:__schedule+0x1061/0x1ec0 [ 24.216215] Code: 4c 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 ea 08 00 00 4d 8b 6d 00 4d 85 ed 0f 84 6b f6 ff ff 49 8d 7d 10 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 a6 e8 43 28 04 fb eb 9f 4c 89 e6 48 89 df e8 e6 [ 24.235107] RSP: 0018:ffff8801b4626a80 EFLAGS: 00010806 [ 24.240466] RAX: 1bd5a00000000022 RBX: ffff8801a7c0e340 RCX: 1ffff10035c3b88f [ 24.247738] RDX: 0000000040000000 RSI: 0000000000000000 RDI: dead000000000110 [ 24.255002] RBP: ffff8801b4626c50 R08: ffff8801a7c0e340 R09: fffff520003c3a47 [ 24.262270] R10: fffff520003c3a47 R11: ffffc90001e1d23b R12: ffff8801af68a700 [ 24.269529] R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801db02ca40 [ 24.276793] FS: 0000000000b61880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 [ 24.285007] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.290910] CR2: 0000000000442e5e CR3: 00000001c2c4c000 CR4: 00000000001426f0 [ 24.298172] Kernel panic - not syncing: Fatal exception [ 25.404464] Shutting down cpus with NMI [ 25.408864] Dumping ftrace buffer: [ 25.412396] (ftrace buffer empty) [ 25.416101] Kernel Offset: disabled [ 25.419814] Rebooting in 86400 seconds..