[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.739864] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.218829] random: sshd: uninitialized urandom read (32 bytes read) [ 28.496549] random: sshd: uninitialized urandom read (32 bytes read) [ 29.067402] random: sshd: uninitialized urandom read (32 bytes read) [ 42.998003] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.192' (ECDSA) to the list of known hosts. [ 48.591994] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 48.692336] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details. [ 48.716205] kasan: CONFIG_KASAN_INLINE enabled [ 48.720942] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 48.728372] general protection fault: 0000 [#1] SMP KASAN [ 48.733918] CPU: 0 PID: 4489 Comm: syz-executor233 Not tainted 4.18.0+ #103 [ 48.741004] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.750440] RIP: 0010:finish_task_switch+0x538/0x870 [ 48.755555] Code: 89 e1 48 c1 e9 03 42 80 3c 39 00 0f 85 ab 01 00 00 4d 8b 24 24 4d 85 e4 0f 84 e3 fc ff ff 49 8d 7c 24 10 48 89 f9 48 c1 e9 03 <42> 80 3c 39 00 74 a5 e8 8c a5 67 00 eb 9e 80 3d 8b c3 32 07 00 0f [ 48.774453] RSP: 0018:ffff8801ac0ff058 EFLAGS: 00010a06 [ 48.779911] RAX: 0000000000000000 RBX: ffff8801db02cc40 RCX: 1bd5a00000000022 [ 48.787167] RDX: 0000000000000000 RSI: ffffffff810ed162 RDI: dead000000000110 [ 48.794421] RBP: ffff8801ac0ff140 R08: ffff8801acb8c300 R09: ffffed003b221b6c [ 48.801676] R10: ffffed003b221b6c R11: ffff8801d910db67 R12: dead000000000100 [ 48.808936] R13: ffff8801ca5e0040 R14: 0000000000000000 R15: dffffc0000000000 [ 48.816196] FS: 0000000000000000(0000) GS:ffff8801db000000(0063) knlGS:00000000f7f07b40 [ 48.824409] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 48.830379] CR2: 00007f1304e0b000 CR3: 00000001acab3000 CR4: 00000000001426f0 [ 48.837636] Call Trace: [ 48.840214] ? __switch_to_asm+0x34/0x70 [ 48.844365] ? preempt_notifier_register+0x200/0x200 [ 48.849452] ? __switch_to_asm+0x34/0x70 [ 48.853511] ? __switch_to_asm+0x34/0x70 [ 48.857560] ? __switch_to_asm+0x40/0x70 [ 48.861609] ? __switch_to_asm+0x34/0x70 [ 48.865652] ? __switch_to_asm+0x40/0x70 [ 48.869696] ? __switch_to_asm+0x34/0x70 [ 48.873738] ? __switch_to_asm+0x40/0x70 [ 48.877787] ? __switch_to_asm+0x34/0x70 [ 48.881888] ? __switch_to_asm+0x34/0x70 [ 48.885946] ? __switch_to_asm+0x40/0x70 [ 48.889993] ? __switch_to_asm+0x34/0x70 [ 48.894043] ? __switch_to_asm+0x40/0x70 [ 48.898087] ? __switch_to_asm+0x34/0x70 [ 48.902134] ? __switch_to_asm+0x40/0x70 [ 48.906183] __schedule+0x884/0x1df0 [ 48.909889] ? __sched_text_start+0x8/0x8 [ 48.914024] ? graph_lock+0x170/0x170 [ 48.917842] ? plist_check_list+0xa0/0xa0 [ 48.921974] ? mark_held_locks+0x160/0x160 [ 48.926210] schedule+0xfb/0x450 [ 48.929575] ? lock_downgrade+0x8f0/0x8f0 [ 48.933704] ? __schedule+0x1df0/0x1df0 [ 48.937662] ? kasan_check_read+0x11/0x20 [ 48.941798] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.946208] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.950792] ? lock_acquire+0x1e4/0x4f0 [ 48.954773] futex_wait_queue_me+0x3f9/0x840 [ 48.959186] ? refill_pi_state_cache.part.8+0x320/0x320 [ 48.964656] ? kasan_check_write+0x14/0x20 [ 48.968907] ? do_raw_spin_lock+0xc1/0x200 [ 48.973152] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.978698] ? get_futex_value_locked+0xcb/0xf0 [ 48.983366] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.988384] ? futex_wait_setup+0x281/0x410 [ 48.992698] ? futex_wake+0x760/0x760 [ 48.996492] ? print_usage_bug+0xc0/0xc0 [ 49.000540] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 49.005200] futex_wait+0x45b/0xa20 [ 49.008829] ? futex_wait_setup+0x410/0x410 [ 49.013153] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 49.018352] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 49.023883] ? drop_futex_key_refs.isra.14+0x6d/0xe0 [ 49.028973] ? futex_wake+0x304/0x760 [ 49.032879] ? lock_downgrade+0x8f0/0x8f0 [ 49.037064] do_futex+0x336/0x27d0 [ 49.040595] ? rcu_is_watching+0x8c/0x150 [ 49.044728] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 49.049382] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 49.054039] ? exit_robust_list+0x290/0x290 [ 49.058447] ? kernel_text_address+0x79/0xf0 [ 49.062851] ? __kernel_text_address+0xd/0x40 [ 49.067344] ? unwind_get_return_address+0x61/0xa0 [ 49.072361] ? __save_stack_trace+0x8d/0xf0 [ 49.076680] ? save_stack+0xa9/0xd0 [ 49.080294] ? save_stack+0x43/0xd0 [ 49.084031] ? __kasan_slab_free+0x11a/0x170 [ 49.088435] ? kasan_slab_free+0xe/0x10 [ 49.092400] ? kmem_cache_free+0x86/0x280 [ 49.096537] ? putname+0xf2/0x130 [ 49.099984] ? do_sys_open+0x569/0x760 [ 49.103854] ? __ia32_compat_sys_openat+0x98/0xf0 [ 49.108683] ? do_fast_syscall_32+0x34d/0xfb2 [ 49.113170] ? entry_SYSENTER_compat+0x70/0x7f [ 49.117747] ? trace_hardirqs_off+0xb8/0x2b0 [ 49.122146] ? kasan_check_read+0x11/0x20 [ 49.126285] ? do_raw_spin_unlock+0xa7/0x2f0 [ 49.130696] ? trace_hardirqs_on+0x2c0/0x2c0 [ 49.135096] ? kasan_check_write+0x14/0x20 [ 49.139313] ? trace_hardirqs_off+0xb8/0x2b0 [ 49.143757] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 49.148845] ? trace_hardirqs_on+0x2c0/0x2c0 [ 49.153237] ? kmem_cache_free+0xa0/0x280 [ 49.157429] ? kasan_check_read+0x11/0x20 [ 49.161588] ? rcu_is_watching+0x8c/0x150 [ 49.165732] ? trace_hardirqs_on+0xbd/0x2c0 [ 49.170045] ? rcu_pm_notify+0xc0/0xc0 [ 49.173927] ? putname+0xf2/0x130 [ 49.177363] ? putname+0xf2/0x130 [ 49.180811] ? rcu_read_lock_sched_held+0x108/0x120 [ 49.185822] ? kmem_cache_free+0x246/0x280 [ 49.190046] __ia32_compat_sys_futex+0x3d9/0x5f0 [ 49.194796] ? do_fast_syscall_32+0x150/0xfb2 [ 49.199287] ? __x32_compat_sys_get_robust_list+0x430/0x430 [ 49.204983] ? trace_hardirqs_on+0xbd/0x2c0 [ 49.209290] ? exit_to_usermode_loop+0x1f4/0x380 [ 49.214042] ? entry_SYSENTER_compat+0x70/0x7f [ 49.218614] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 49.223804] do_fast_syscall_32+0x34d/0xfb2 [ 49.228111] ? do_int80_syscall_32+0x890/0x890 [ 49.232695] ? entry_SYSENTER_compat+0x68/0x7f [ 49.237280] ? trace_hardirqs_off_caller+0xbb/0x2b0 [ 49.242282] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.247112] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.251941] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 49.257053] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 49.262066] ? prepare_exit_to_usermode+0x291/0x3b0 [ 49.267074] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.271908] entry_SYSENTER_compat+0x70/0x7f [ 49.276338] RIP: 0023:0xf7f0bca9 [ 49.279738] Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 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 [ 49.298643] RSP: 002b:00000000f7f071ec EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 [ 49.306349] RAX: ffffffffffffffda RBX: 00000000080fb008 RCX: 0000000000000000 [ 49.313610] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 49.320873] RBP: 00000000c080aebe R08: 0000000000000000 R09: 0000000000000000 [ 49.328129] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 49.335385] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 49.342652] Modules linked in: [ 49.345957] Dumping ftrace buffer: [ 49.349483] (ftrace buffer empty) [ 49.353341] ---[ end trace a4bb2f1beb6735f0 ]--- [ 49.358125] RIP: 0010:finish_task_switch+0x538/0x870 [ 49.363359] Code: 89 e1 48 c1 e9 03 42 80 3c 39 00 0f 85 ab 01 00 00 4d 8b 24 24 4d 85 e4 0f 84 e3 fc ff ff 49 8d 7c 24 10 48 89 f9 48 c1 e9 03 <42> 80 3c 39 00 74 a5 e8 8c a5 67 00 eb 9e 80 3d 8b c3 32 07 00 0f [ 49.382337] RSP: 0018:ffff8801ac0ff058 EFLAGS: 00010a06 [ 49.387732] RAX: 0000000000000000 RBX: ffff8801db02cc40 RCX: 1bd5a00000000022 [ 49.395110] RDX: 0000000000000000 RSI: ffffffff810ed162 RDI: dead000000000110 [ 49.402423] RBP: ffff8801ac0ff140 R08: ffff8801acb8c300 R09: ffffed003b221b6c [ 49.409882] R10: ffffed003b221b6c R11: ffff8801d910db67 R12: dead000000000100 [ 49.417358] R13: ffff8801ca5e0040 R14: 0000000000000000 R15: dffffc0000000000 [ 49.424711] FS: 0000000000000000(0000) GS:ffff8801db000000(0063) knlGS:00000000f7f07b40 [ 49.432977] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 49.438901] CR2: 00007f1304e0b000 CR3: 00000001acab3000 CR4: 00000000001426f0 [ 49.446193] Kernel panic - not syncing: Fatal exception [ 49.451854] Dumping ftrace buffer: [ 49.455382] (ftrace buffer empty) [ 49.459077] Kernel Offset: disabled [ 49.462697] Rebooting in 86400 seconds..