[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.934736] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.653493] random: sshd: uninitialized urandom read (32 bytes read) [ 23.035626] random: sshd: uninitialized urandom read (32 bytes read) [ 23.891177] random: sshd: uninitialized urandom read (32 bytes read) [ 24.051150] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 29.554574] random: sshd: uninitialized urandom read (32 bytes read) [ 29.646245] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 29.654243] PGD 1b51e5067 P4D 1b51e5067 PUD 1b508f067 PMD 0 [ 29.660038] Oops: 0010 [#1] SMP KASAN [ 29.663821] CPU: 1 PID: 4485 Comm: syz-executor452 Not tainted 4.17.0+ #90 [ 29.670806] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.680139] RIP: 0010: (null) [ 29.683997] Code: Bad RIP value. [ 29.687365] RSP: 0018:ffff8801b6f273a0 EFLAGS: 00010246 [ 29.692706] RAX: 0000000000000000 RBX: ffff8801b629b800 RCX: 1ffffffff10ea805 [ 29.699971] RDX: ffff8801b6f27c00 RSI: ffff8801ae67a100 RDI: ffff8801b51feac0 [ 29.707219] RBP: ffff8801b6f27510 R08: ffff8801b563cf78 R09: 0000000000000006 [ 29.714469] R10: ffff8801b563c740 R11: 0000000000000000 R12: 1ffff10036de4e79 [ 29.721731] R13: ffff8801b6f27c00 R14: ffff8801b629b812 R15: ffff8801b629bc58 [ 29.728990] FS: 0000000001c2b880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 29.737199] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.743062] CR2: ffffffffffffffd6 CR3: 00000001b5625000 CR4: 00000000001406e0 [ 29.750316] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.757563] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.764812] Call Trace: [ 29.767382] ? smc_poll+0x211/0xdd0 [ 29.770988] ? __smc_connect+0xa90/0xa90 [ 29.775033] ? save_stack+0x43/0xd0 [ 29.778636] ? kasan_kmalloc+0xc4/0xe0 [ 29.782510] ? kasan_slab_alloc+0x12/0x20 [ 29.786633] ? kmem_cache_alloc+0x12e/0x760 [ 29.790933] ? ep_insert+0x270/0x1c00 [ 29.794718] ? __x64_sys_epoll_ctl+0xef1/0x10f0 [ 29.799367] ? do_syscall_64+0x1b1/0x800 [ 29.803408] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.808756] ? graph_lock+0x170/0x170 [ 29.812542] ? debug_check_no_locks_freed+0x310/0x310 [ 29.817726] ? find_held_lock+0x36/0x1c0 [ 29.821765] ? print_usage_bug+0xc0/0xc0 [ 29.825811] sock_poll+0x1d1/0x710 [ 29.829333] ? __smc_connect+0xa90/0xa90 [ 29.833382] ? sock_get_poll_head+0x460/0x460 [ 29.837862] ? sock_get_poll_head+0x460/0x460 [ 29.842338] vfs_poll+0x77/0x2a0 [ 29.845683] ep_item_poll.isra.15+0x2c1/0x390 [ 29.850161] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.855164] ? ep_eventpoll_poll+0x1f0/0x1f0 [ 29.859555] ? ep_insert+0x270/0x1c00 [ 29.863340] ep_insert+0x6b8/0x1c00 [ 29.866948] ? pudp_huge_clear_flush+0x230/0x230 [ 29.871682] ? ep_send_events_proc+0xee0/0xee0 [ 29.876242] ? lock_release+0xa10/0xa10 [ 29.880193] ? check_same_owner+0x320/0x320 [ 29.884497] ? rcu_note_context_switch+0x710/0x710 [ 29.889405] ? __might_sleep+0x95/0x190 [ 29.893357] ? kasan_check_write+0x14/0x20 [ 29.897577] ? __mutex_lock+0x7d9/0x17f0 [ 29.901619] ? __x64_sys_epoll_ctl+0x518/0x10f0 [ 29.906271] ? find_held_lock+0x36/0x1c0 [ 29.910325] ? mutex_trylock+0x2a0/0x2a0 [ 29.914385] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.919388] ? graph_lock+0x170/0x170 [ 29.923173] ? lockdep_init_map+0x9/0x10 [ 29.927212] ? debug_mutex_init+0x2d/0x60 [ 29.931348] ? pud_val+0x80/0xf0 [ 29.934699] ? pmd_val+0xf0/0xf0 [ 29.938049] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.943568] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.949092] ? __handle_mm_fault+0x93a/0x4390 [ 29.953579] ? find_held_lock+0x36/0x1c0 [ 29.957625] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.963141] ? __fget_light+0x2ef/0x430 [ 29.967107] ? fget_raw+0x20/0x20 [ 29.970551] ? find_held_lock+0x36/0x1c0 [ 29.974612] ? __might_sleep+0x95/0x190 [ 29.978568] ? clear_tfile_check_list+0x380/0x380 [ 29.983389] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.988560] __x64_sys_epoll_ctl+0xef1/0x10f0 [ 29.993047] ? __ia32_sys_epoll_create+0x70/0x70 [ 29.997780] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.003305] ? __do_page_fault+0x441/0xe40 [ 30.007529] ? mm_fault_error+0x380/0x380 [ 30.011669] ? __ia32_sys_fallocate+0xf0/0xf0 [ 30.016151] ? do_syscall_64+0x92/0x800 [ 30.020111] do_syscall_64+0x1b1/0x800 [ 30.023976] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.028889] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.033798] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.039332] ? retint_user+0x18/0x18 [ 30.043035] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.047860] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.053035] RIP: 0033:0x43fcc9 [ 30.056206] 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 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 [ 30.075321] RSP: 002b:00007fff59e3a2f8 EFLAGS: 00000217 ORIG_RAX: 00000000000000e9 [ 30.083010] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcc9 [ 30.090263] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 30.097510] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 30.104757] R10: 0000000020000000 R11: 0000000000000217 R12: 00000000004015f0 [ 30.112006] R13: 0000000000401680 R14: 0000000000000000 R15: 0000000000000000 [ 30.119278] Modules linked in: [ 30.122456] Dumping ftrace buffer: [ 30.125978] (ftrace buffer empty) [ 30.129671] CR2: 0000000000000000 [ 30.133338] ---[ end trace 090a30b2125a99a3 ]--- [ 30.138115] RIP: 0010: (null) [ 30.142028] Code: Bad RIP value. [ 30.145404] RSP: 0018:ffff8801b6f273a0 EFLAGS: 00010246 [ 30.150766] RAX: 0000000000000000 RBX: ffff8801b629b800 RCX: 1ffffffff10ea805 [ 30.158041] RDX: ffff8801b6f27c00 RSI: ffff8801ae67a100 RDI: ffff8801b51feac0 [ 30.165330] RBP: ffff8801b6f27510 R08: ffff8801b563cf78 R09: 0000000000000006 [ 30.172617] R10: ffff8801b563c740 R11: 0000000000000000 R12: 1ffff10036de4e79 [ 30.179904] R13: ffff8801b6f27c00 R14: ffff8801b629b812 R15: ffff8801b629bc58 [ 30.187178] FS: 0000000001c2b880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 30.195402] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.201284] CR2: ffffffffffffffd6 CR3: 00000001b5625000 CR4: 00000000001406e0 [ 30.208557] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.215828] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.223099] Kernel panic - not syncing: Fatal exception [ 30.228908] Dumping ftrace buffer: [ 30.232430] (ftrace buffer empty) [ 30.236119] Kernel Offset: disabled [ 30.239724] Rebooting in 86400 seconds..